SQ24 Series Data Sheet
SQ24 Family DS Ver 5 05-14-04 USA Toll Free 866 WOW-didt Page 1 of 70
The new SemiQ™ Family of DC/DC converters from di/dt
provides a high efficiency single output in a size that is only
60% of industry-standard quarter bricks, while preserving the
same pinout and functionality.
In high temperature environments, for output voltages rang-
ing from 3.3V to 1.0V, the thermal performance of SemiQ™
converters exceeds that of most competitors' 20-30A quarter
bricks. This is accomplished through the use of patent pend-
ing circuit, packaging and processing techniques to achieve
ultra-high efficiency, excellent thermal management and a
very low body profile.
Low body profile and the preclusion of heat sinks minimize
airflow shadowing, thus enhancing cooling for downstream
devices. The use of 100% automation for assembly, coupled
with di/dt’s advanced electric and thermal design, results in a
product with extremely high reliability.
Operating from a 18-36V input, the SQ24 Series converters
of the SemiQ™ Family provides any standard output volt-
age from 12V down to 1.0V. Outputs can be trimmed from –
20% to +10% of the nominal output voltage (±10% for output
voltages 1.2V and 1.0V), thus providing outstanding design
flexibility.
With a standard pinout and trim equations, the SQ24 Series
converters are perfect drop-in replacements for existing
quarter brick designs. Inclusion of this converter in new de-
signs can result in significant board space and cost savings.
The device is also available in a surface mount package.
In both cases the designer can expect reliability improve-
ment over other available converters because of the SQ24
Series’ optimized thermal efficiency.
Applications
• Telecommunications
• Datacommunications
• Wireless
• Servers
SQ24T and SQ24S Converters
Features
• Delivers up to 15A (50 W)
• Available in through-hole and SM packages
• Lowest weight in industry: 0.53 oz (15 g)
• Lowest profile in industry: 0.274” (6.96 mm)
• Extremely small footprint: 0.896” x 2.30” (2.06 in2)
• Outputs available in 12.0, 8.0, 6.0, 5.0, 3.3, 2.5, 2.0,
1.8, 1.5, 1.2 and 1.0V
• High efficiency – no heat sink required
• On-board input differential LC-filter
• Extremely low output and input ripple
• Start up into pre-biased output
• No minimum load required
• Meets Basic Insulation requirements of EN60950
• Fixed frequency operation
• Fully protected
• Remote output sense
• Output voltage trim range: +10%/20% (except 1.2V
and 1.0V outputs with trim range ±10%) with industry-
standard trim equations
• High reliability: MTBF of 3.4 million hours, calculated
per Telcordia TR-332, Method I Case 1
• Positive or negative logic ON/OFF option
• UL 60950 recognition in US and Canada and DEMKO
certification per IEC/EN 60950
• Meets conducted emissions requirements of FCC
Class B and EN 55022 Class B with external filter
• All materials meet UL94, V-0 flammability rating
SQ24 Series Data Sheet
SQ24 Family DS Ver 5 05-14-04 USA Toll Free 866 WOW-didt Page 2 of 70
Electrical Specifications (common to all versions)
Conditions: TA=25ºC, Airflow=300 LFM (1.5 m/s), Vin=24Vdc, All output voltages, unless otherwise specified.
PARAMETER NOTES MIN TYP MAX UNITS
ABSOLUTE MAXIMUM RATINGS
Input Voltage Continuous 0 40 Vdc
Operating Ambient Temperature -40 85 °C
Storage Temperature -55 125 °C
INPUT CHARACTERISTICS
Operating Input Voltage Range 18 24 36 Vdc
Input Under Voltage Lockout Non-latching
Turn-on Threshold 16 17 17.5 Vdc
Turn-off Threshold 15 16 16.5 Vdc
ISOLATION CHARACTERISTICS
I/O Isolation 2000 Vdc
Isolation Capacitance: 1.0 - 3.3V 160 pF
5.0 - 6.0V 260 pF
8.0V, 12V 230 pF
Isolation Resistance 10 M
FEATURE CHARACTERISTICS
Switching Frequency 415 kHz
Output Voltage Trim Range1 Industry-std. equations (1.5 - 12V) -20 +10 %
Industry-std. equations (1.0 - 1.2V) -10 +10 %
Remote Sense Compensation1 Percent of VOUT(NOM) +10 %
Output Over-Voltage Protection Non-latching (1.5 - 12V) 117 125 140 %
Non-latching (1.0 - 1.2V) 124 132 140 %
Auto-Restart Period Applies to all protection features 100 ms
Turn-On Time 4 ms
ON/OFF Control (Positive Logic)
Converter Off -20 0.8 Vdc
Converter On 2.4 20 Vdc
ON/OFF Control (Negative Logic)
Converter Off 2.4 20 Vdc
Converter On -20 0.8 Vdc
Additional Notes:
1. Vout can be increased up to 10% via the sense leads or up to 10% via the trim function, however total output voltage trim from all sources
should not exceed 10% of VOUT(NOM), in order to insure specified operation of over-voltage protection circuitry. See “Output Voltage Adjust/Trim” for
detailed information.
SQ24 Series Data Sheet
SQ24 Family DS Ver 5 05-14-04 USA Toll Free 866 WOW-didt Page 3 of 70
Operation
Input and Output Impedance
These power converters have been designed to be stable
with no external capacitors when used in low inductance in-
put and output circuits.
However, in many applications, the inductance associated
with the distribution from the power source to the input of the
converter can affect the stability of the converter. The addi-
tion of a 100µF electrolytic capacitor with an ESR < 1Ω
across the input helps ensure stability of the converter. In
many applications, the user has to use decoupling capaci-
tance at the load. The power converter will exhibit stable op-
eration with external load capacitance up to 1000µF on
12V, 2,200µF on 8.0V, 10,000 µF on 5.0V – 6.0V, and
15,000µF on 3.3V – 1.0V outputs.
ON/OFF (Pin 2)
The ON/OFF pin is used to turn the power converter on or
off remotely via a system signal. There are two remote con-
trol options available, positive logic and negative logic and
both are referenced to Vin(-). Typical connections are shown
in Fig. A.
Rload
Vin
CONTROL
INPUT
Vin (+)
Vin (-)
ON/OFF
Vout (+)
Vout (-)
TRIM
SENSE (+)
SENSE (-)
(Top View)
Converter
Semi
Q
TM
Family
Fig. A: Circuit configuration for ON/OFF function.
The positive logic version turns on when the ON/OFF pin is
at logic high and turns off when at logic low. The converter is
on when the ON/OFF pin is left open.
The negative logic version turns on when the pin is at logic
low and turns off when the pin is at logic high. The ON/OFF
pin can be hard wired directly to Vin(-) to enable automatic
power up of the converter without the need of an external
control signal.
ON/OFF pin is internally pulled-up to 5 V through a resistor.
A mechanical switch, open collector transistor, or FET can
be used to drive the input of the ON/OFF pin. The device
must be capable of sinking up to 0.2mA at a low level volt-
age of ≤ 0.8V. An external voltage source (±20V maximum)
may be connected directly to the ON/OFF input, in which
case it must be capable of sourcing or sinking up to 1mA
depending on the signal polarity. See the Start-up Informa-
tion section for system timing waveforms associated with
use of the ON/OFF pin.
Remote Sense (Pins 5 and 7)
The remote sense feature of the converter compensates for
voltage drops occurring between the output pins of the con-
verter and the load. The SENSE(-) (Pin 5) and SENSE(+)
(Pin 7) pins should be connected at the load or at the point
where regulation is required (see Fig. B).
100
10
Rw
Rw
Rload
Vin
Vin (+)
Vin (-)
ON/OFF
Vout (+)
Vout (-)
TRIM
SENSE (+)
SENSE (-)
(Top View)
Converter
Semi
Q
TM
Family
Fig. B: Remote sense circuit configuration.
If remote sensing is not required, the SENSE(-) pin must be
connected to the Vout(-) pin (Pin 4), and the SENSE(+) pin
must be connected to the Vout(+) pin (Pin 8) to ensure the
converter will regulate at the specified output voltage. If
these connections are not made, the converter will deliver an
output voltage that is slightly higher than the specified value.
Because the sense leads carry minimal current, large traces
on the end-user board are not required. However, sense
traces should be located close to a ground plane to minimize
system noise and insure optimum performance. When wiring
discretely, twisted pair wires should be used to connect the
sense lines to the load to reduce susceptibility to noise.
The converter’s output over-voltage protection (OVP) senses
the voltage across Vout(+) and Vout(-), and not across the
sense lines, so the resistance (and resulting voltage drop)
between the output pins of the converter and the load should
be minimized to prevent unwanted triggering of the OVP.
When utilizing the remote sense feature, care must be taken
not to exceed the maximum allowable output power capabil-
SQ24 Series Data Sheet
SQ24 Family DS Ver 5 05-14-04 USA Toll Free 866 WOW-didt Page 4 of 70
ity of the converter, equal to the product of the nominal out-
put voltage and the allowable output current for the given
conditions.
When using remote sense, the output voltage at the con-
verter can be increased by as much as 10% above the
nominal rating in order to maintain the required voltage
across the load. Therefore, the designer must, if necessary,
decrease the maximum current (originally obtained from the
derating curves) by the same percentage to ensure the con-
verter’s actual output power remains at or below the maxi-
mum allowable output power.
Output Voltage Adjust /TRIM (Pin 6)
The converter’s output voltage can be adjusted up 10% or
down 20% for Vout 1.5V, and ±10% for Vout = 1.2V and
1.0 V, relative to the rated output voltage by the addition of
an externally connected resistor. For output voltages 3.3V,
trim up to 10% is guaranteed only at Vin 20V, and it is
marginal (8% to 10%) at Vin = 18V depending on load cur-
rent.
The TRIM pin should be left open if trimming is not being
used. To minimize noise pickup, a 0.1 µF capacitor is con-
nected internally between the TRIM and SENSE(-) pins.
To increase the output voltage, refer to Fig. C. A trim resis-
tor, RT-INCR, should be connected between the TRIM (Pin 6)
and SENSE(+) (Pin 7), with a value of:
10.22
1.225∆
626∆)V5.11(100
RNOMO
INCRT −
−+
=−
− [kΩ] (1.5 –12V)
∆
485
RINCRT =− [kΩ] (1.2V)
2
∆
323
RINCRT −=− [kΩ] (1.0V)
where,
=−INCRTRRequired value of trim-up resistor kΩ]
=−NOMOVNominal value of output voltage [V]
100X
V
)V(V
∆
NOM- O
NOM-OREQ-O −
= [%]
=−REQOVDesired (trimmed) output voltage [V].
When trimming up, care must be taken not to exceed the
converter‘s maximum allowable output power. See previous
section for a complete discussion of this requirement.
Rload
Vin
Vin (+)
Vin (-)
ON/OFF
Vout (+)
Vout (-)
TRIM
SENSE (+)
SENSE (-)
R
T-INCR
(Top View)
Converter
Semi
Q
TM
Family
Fig. C: Configuration for increasing output voltage.
To decrease the output voltage (Fig. D), a trim resistor,
RT-DECR, should be connected between the TRIM (Pin 6) and
SENSE(-) (Pin 5), with a value of:
10.22
|∆|
511
RDECRT −=− [kΩ] (1.0 – 12V)
where,
=
−DECRTRRequired value of trim-down resistor [kΩ]
and
∆
is as defined above.
Note: The above equations for calculation of trim resistor
values match those typically used in conventional industry-
standard quarter bricks and one-eighth bricks.
Converters with output voltage 1.2V and 1.0V have specific
trim schematic and equations, to provide the customers with
the flexibility of second sourcing. For these converters, the
last character of part number is “T”. More information about
trim feature, including corresponding schematic portions, can
be found in Application Note 103.
Rload
Vin
Vin (+)
Vin (-)
ON/OFF
Vout (+)
Vout (-)
TRIM
SENSE (+)
SENSE (-)
R
T-DECR
(Top View)
Converter
Semi
Q
TM
Family
Fig. D: Configuration for decreasing output voltage.
Trimming/sensing beyond 110% of the rated output voltage
is not an acceptable design practice, as this condition could
cause unwanted triggering of the output over-voltage protec-
tion (OVP) circuit. The designer should ensure that the dif-
ference between the voltages across the converter’s output
pins and its sense pins does not exceed 10% of VOUT(NOM),
or:
X NOM-O SENSESENSEOUTOUT 10%V)](V)([V)](V)([V
≤
−−+
−
−
−
+
[V]
This equation is applicable for any condition of output sens-
ing and/or output trim.
SQ24 Series Data Sheet
SQ24 Family DS Ver 5 05-14-04 USA Toll Free 866 WOW-didt Page 5 of 70
Protection Features
Input Under-Voltage Lockout
Input under-voltage lockout is standard with this converter.
The converter will shut down when the input voltage drops
below a pre-determined voltage.
The input voltage must be at least 17.5V for the converter to
turn on. Once the converter has been turned on, it will shut
off when the input voltage drops below 15V. This feature is
beneficial in preventing deep discharging of batteries used in
telecom applications.
Output Over-Current Protection (OCP)
The converter is protected against over-current or short cir-
cuit conditions. Upon sensing an over-current condition, the
converter will switch to constant current operation and
thereby begin to reduce output voltage. When the output
voltage drops below 50% of the nominal value of output volt-
age, the converter will shut down.
Once the converter has shut down, it will attempt to restart
nominally every 100 ms with a typical 1-2% duty cycle. The
attempted restart will continue indefinitely until the overload
or short circuit conditions are removed or the output voltage
rises above 50% of its nominal value.
Output Over-Voltage Protection (OVP)
The converter will shut down if the output voltage across
Vout(+) (Pin 8) and Vout(-) (Pin 4) exceeds the threshold of
the OVP circuitry. The OVP circuitry contains its own refer-
ence, independent of the output voltage regulation loop.
Once the converter has shut down, it will attempt to restart
every 100 ms until the OVP condition is removed.
Over-Temperature Protection (OTP)
The converter will shut down under an over-temperature
condition to protect itself from overheating caused by opera-
tion outside the thermal derating curves, or operation in ab-
normal conditions such as system fan failure. After the con-
verter has cooled to a safe operating temperature, it will
automatically restart.
Safety Requirements
The converters meet North American and International
safety regulatory requirements per UL60950 and EN60950.
Basic Insulation is provided between input and output.
To comply with safety agencies requirements, an input line
fuse must be used external to the converter. The Table be-
low provides the recommended fuse rating for use with this
family of products.
Output Voltage Fuse Rating
3.3V 8
A
12V - 5.0V
,
2.5V 6
A
2.0V - 1.0V 4
A
If one input fuse is used for a group of modules, the maxi-
mum fuse rating should not exceed 15-A (SQ modules are
UL approved with up to a 15-A fuse).
Electromagnetic Compatibility (EMC)
EMC requirements must be met at the end-product system
level, as no specific standards dedicated to EMC character-
istics of board mounted component dc-dc converters exist.
However, di/dt tests its converters to several system level
standards, primary of which is the more stringent EN55022,
Information technology equipment - Radio disturbance char-
acteristics - Limits and methods of measurement.
With the addition of a simple external filter (see application
notes), all versions of the SQ24 Series of converters pass
the requirements of Class B conducted emissions per
EN55022 and FCC, and meet at a minimum, Class A radi-
ated emissions per EN 55022 and Class B per FCC Title
47CFR, Part 15-J. Please contact di/dt Applications Engi-
neering for details of this testing.
Characterization
General Information
The converter has been characterized for many operational
aspects, to include thermal derating (maximum load current
as a function of ambient temperature and airflow) for vertical
and horizontal mounting, efficiency, start-up and shutdown
parameters, output ripple and noise, transient response to
load step-change, overload and short circuit.
The figures are numbered as Fig. x.y, where x indicates the
different output voltages, and y is associated with a specific
plot (y = 1 for the vertical thermal derating, …). For example,
Fig. x.1 will refer to the vertical thermal derating for all the
output voltages in general.
The following pages contain specific plots or waveforms as-
sociated with the converter. Additional comments for specific
data are provided below.
SQ24 Series Data Sheet
SQ24 Family DS Ver 5 05-14-04 USA Toll Free 866 WOW-didt Page 6 of 70
Test Conditions
All data presented were taken with the converter soldered to
a test board, specifically a 0.060” thick printed wiring board
(PWB) with four layers. The top and bottom layers were not
metalized. The two inner layers, comprising two-ounce cop-
per, were used to provide traces for connectivity to the con-
verter.
The lack of metalization on the outer layers as well as the
limited thermal connection ensured that heat transfer from
the converter to the PWB was minimized. This provides a
worst-case but consistent scenario for thermal derating pur-
poses.
All measurements requiring airflow were made in di/dt’s ver-
tical and horizontal wind tunnel facilities using Infrared (IR)
thermography and thermocouples for thermometry.
Ensuring components on the converter do not exceed their
ratings is important to maintaining high reliability. If one an-
ticipates operating the converter at or close to the maximum
loads specified in the derating curves, it is prudent to check
actual operating temperatures in the application. Thermo-
graphic imaging is preferable; if this capability is not avail-
able, then thermocouples may be used. di/dt recommends
the use of AWG #40 gauge thermocouples to ensure meas-
urement accuracy. Careful routing of the thermocouple leads
will further minimize measurement error. Refer to Figure H
for optimum measuring thermocouple location.
Thermal Derating
Load current vs. ambient temperature and airflow rates are
given in Fig. x.1 for through-hole version. Ambient tempera-
ture was varied between 25°C and 85°C, with airflow rates
from 30 to 500 LFM (0.15 to 2.5m/s), and vertical and hori-
zontal converter mounting.
For each set of conditions, the maximum load current was
defined as the lowest of:
(i) The output current at which any FET junction temperature
did not exceed a maximum specified temperature (120°C) as
indicated by the thermographic image, or
(ii) The nominal rating of the converter (4A on 12V, 5.3A on
8.0V, 8A on 6.0V, 10A on 5.0V, and 15A on 3.3 – 1.0V).
During normal operation, derating curves with maximum FET
temperature less than or equal to 120°C should not be ex-
ceeded. Temperature on the PCB at the thermocouple loca-
tion shown in Fig. H should not exceed 118°C in order to
operate inside the derating curves.
Fig. H: Location of the thermocouple for thermal testing.
Efficiency
Fig. x.5 shows the efficiency vs. load current plot for ambient
temperature of 25ºC, airflow rate of 300 LFM (1.5m/s) with
vertical mounting and input voltages of 18V, 24V and 36V.
Also, a plot of efficiency vs. load current, as a function of
ambient temperature with Vin = 24V, airflow rate of 200 LFM
(1 m/s) with vertical mounting is shown in Fig. x.6.
Power Dissipation
Fig. x.7 shows the power dissipation vs. load current plot for
Ta = 25ºC, airflow rate of 300 LFM (1.5m/s) with vertical
mounting and input voltages of 18V, 24V and 36V. Also, a
plot of power dissipation vs. load current, as a function of
ambient temperature with Vin = 24V, airflow rate of 200 LFM
(1 m/s) with vertical mounting is shown in Fig. x.8.
Start-up
Output voltage waveforms, during the turn-on transient using
the ON/OFF pin for full rated load currents (resistive load)
are shown without and with external load capacitance in
Fig. x.9 and Fig. x.10, respectively.
Ripple and Noise
Fig. x.13 shows the output voltage ripple waveform, meas-
ured at full rated load current with a 10 µF tantalum and 1 µF
ceramic capacitor across the output. Note that all output
voltage waveforms are measured across a 1 µF ceramic ca-
pacitor.
The input reflected ripple current waveforms are obtained
using the test setup shown in Fig x.14. The corresponding
waveforms are shown in Fig. x.15 and Fig. x.16.
SQ24 Series Data Sheet
SQ24 Family DS Ver 5 05-14-04 USA Toll Free 866 WOW-didt Page 7 of 70
Start-up Information (using negative ON/OFF)
Scenario #1: Initial Start-up From Bulk Supply
ON/OFF function enabled, converter started via application of VIN.
See Figure E.
Time Comments
t0 ON/OFF pin is ON; system front end power is toggled
on, VIN to converter begins to rise.
t1 V
IN crosses Under-Voltage Lockout protection circuit
threshold; converter enabled.
t2 Converter begins to respond to turn-on command (con-
verter turn-on delay).
t3 Converter VOUT reaches 100% of nominal value.
For this example, the total converter start-up time (t3- t1) is typically
4 ms.
Scenario #2: Initial Start-up Using ON/OFF Pin
With VIN previously powered, converter started via ON/OFF pin.
See Figure F.
Time Comments
t0 V
INPUT at nominal value.
t1 Arbitrary time when ON/OFF pin is enabled (converter
enabled).
t2 End of converter turn-on delay.
t3 Converter VOUT reaches 100% of nominal value.
For this example, the total converter start-up time (t3- t1) is typically
4 ms.
Scenario #3: Turn-off and Restart Using ON/OFF Pin
With VIN previously powered, converter is disabled and then en-
abled via ON/OFF pin. See Figure G.
Time Comments
t0 V
IN and VOUT are at nominal values; ON/OFF pin ON.
t1 ON/OFF pin arbitrarily disabled; converter output falls
to zero; turn-on inhibit delay period (100 ms typical) is
initiated, and ON/OFF pin action is internally inhibited.
t2 ON/OFF pin is externally re-enabled.
If (t2- t1) ≤ 100 ms, external action of ON/OFF pin
is locked out by start-up inhibit timer.
If (t2- t1) > 100 ms, ON/OFF pin action is internally
enabled.
t3 Turn-on inhibit delay period ends. If ON/OFF pin is ON,
converter begins turn-on; if off, converter awaits
ON/OFF pin ON signal; see Figure F.
t4 End of converter turn-on delay.
t5 Converter VOUT reaches 100% of nominal value.
For the condition, (t2- t1) ≤ 100 ms, the total converter start-up
time (t5- t2) is typically 104 ms. For (t2- t1) > 100 ms, start-up will
be typically 4 ms after release of ON/OFF pin.
Fig. E: Start-up scenario #1
ON/OFF
STATE
VOUT
t0t1t2t3
ON
OFF
VIN
t
Fig. F: Start-up scenario #2.
ON/OFF
STATE OFF
ON
VOUT
t0t2t1t5
VIN
t
t4t3
100 ms
Fig. G: Start-up scenario #3.
VIN
ON/OFF
STATE
VOUT
t
t0t1t2t3
ON
OFF
SQ24 Series Data Sheet
SQ24 Family DS Ver 5 05-14-04 USA Toll Free 866 WOW-didt Page 8 of 70
Electrical Specifications: SQ24T/S04120 (12 Volts Out)
Conditions: TA=25ºC, Airflow=300 LFM (1.5 m/s), Vin=24Vdc, Vout=12 Vdc unless otherwise specified.
PARAMETER NOTES MIN TYP MAX UNITS
INPUT CHARACTERISTICS
Maximum Input Current 4 Adc, 12 Vdc Out @ 18 Vdc In 3.1 Adc
Input Stand-by Current Vin = 24V, converter disabled 3 mAdc
Input No Load Current (0 load on the output) Vin = 24V, converter enabled 100 mAdc
Input Reflected-Ripple Current 25MHz bandwidth 6 mAPK-PK
Input Voltage Ripple Rejection 120Hz TBD dB
OUTPUT CHARACTERISTICS
Output Voltage Set Point (no load) 11.880 12.000 12.120 Vdc
Output Regulation
Over Line ±4 ±10 mV
Over Load ±4 ±10 mV
Output Voltage Range Over line, load and temperature2 11.820 12.180 Vdc
Output Ripple and Noise - 25MHz bandwidth Full load + 10 µF tantalum + 1 µF ceramic 90 120 mVPK-PK
External Load Capacitance Plus full load (resistive) 1000 µF
Output Current Range 0 4 Adc
Current Limit Inception Non-latching 5 5.5 Adc
Peak Short-Circuit Current Non-latching. Short=10m. 7.5 10 A
RMS Short-Circuit Current Non-latching 1 Arms
DYNAMIC RESPONSE
Load Change 25% of Iout Max, di/dt = 0.1 A/µS Co = 1 µF ceramic 150 mV
di/dt = 5 A/µS 1 µF ceramic 200 mV
Setting Time to 1% 20 µs
EFFICIENCY
100% Load 87 %
50% Load 87 %
Additional Notes: 2. -40ºC to 85ºC
SQ24 Series Data Sheet
SQ24 Family DS Ver 5 05-14-04 USA Toll Free 866 WOW-didt Page 9 of 70
SQ24T/S04120 (12 Volts Out)
Ambient Temperature [°C]
20 30 40 50 60 70 80 90
Load Current [Adc]
0
1
2
3
4
5
500 LFM (2.5 m/s)
400 LFM (2.0 m/s)
300 LFM (1.5 m/s)
200 LFM (1.0 m/s)
100 LFM (0.5 m/s)
30 LFM (0.15 m/s)
Fig. 12V.1: Available load current vs. ambient air temperature
and airflow rates for SQ24T04120 converter with B height pins
mounted vertically with Vin = 24V, air flowing from pin 3 to pin
1 and maximum FET temperature ≤ 120°C.
Ambient Temperature [°C]
20 30 40 50 60 70 80 90
Load Current [Adc]
0
1
2
3
4
5
500 LFM (2.5 m/s)
400 LFM (2.0 m/s)
300 LFM (1.5 m/s)
200 LFM (1.0 m/s)
100 LFM (0.5 m/s)
30 LFM (0.15 m/s)
Fig. 12V.3: Available load current vs. ambient temperature and
airflow rates for SQ24S04120 converter mounted vertically with
Vin = 24V, air flowing from pin 3 to pin 1 and maximum FET
temperature ≤ 120°C.
Ambient Temperature [°C]
20 30 40 50 60 70 80 90
Load Current [Adc]
0
1
2
3
4
5
500 LFM (2.5 m/s)
400 LFM (2.0 m/s)
300 LFM (1.5 m/s)
200 LFM (1.0 m/s)
100 LFM (0.5 m/s)
30 LFM (0.15 m/s)
Fig. 12V.2: Available load current vs. ambient air temperature
and airflow rates for SQ24T04120 converter with B height pins
mounted horizontally with Vin = 24V, air flowing from pin 3 to
pin 1 and maximum FET temperature ≤ 120°C.
Ambient Temperature [°C]
20 30 40 50 60 70 80 90
Load Current [Adc]
0
1
2
3
4
5
500 LFM (2.5 m/s)
400 LFM (2.0 m/s)
300 LFM (1.5 m/s)
200 LFM (1.0 m/s)
100 LFM (0.5 m/s)
30 LFM (0.15 m/s)
Fig. 12V.4: Available load current vs. ambient temperature and
airflow rates for SQ24S04120 converter mounted horizontally
with Vin = 24V, air flowing from pin 3 to pin 1 and maximum
FET temperature ≤ 120°C.
SQ24 Series Data Sheet
SQ24 Family DS Ver 5 05-14-04 USA Toll Free 866 WOW-didt Page 10 of 70
SQ24T/S04120 (12 Volts Out)
Load Current [Adc]
012345
Efficiency
0.65
0.70
0.75
0.80
0.85
0.90
0.95
36 V
24 V
18 V
Fig. 12V.5: Efficiency vs. load current and input voltage for
SQ24T/S04120 converter mounted vertically with air flowing
from pin 3 to pin 1 at a rate of 300 LFM (1.5 m/s) and Ta =
25°C.
Load Current [Adc]
012345
P
ower
Di
ss
i
pa
ti
on
[W]
0.00
2.00
4.00
6.00
8.00
10.00
36 V
24 V
18 V
Fig. 12V.7: Power dissipation vs. load current and input volt-
age for SQ24T/S04120 converter mounted vertically with air
flowing from pin 3 to pin 1 at a rate of 300 LFM (1.5 m/s) and
Ta = 25°C.
Load Current [Adc]
012345
Efficiency
0.65
0.70
0.75
0.80
0.85
0.90
0.95
70 C
55 C
40 C
Fig. 12V.6: Efficiency vs. load current and ambient tempera-
ture for SQ24T/S04120 converter mounted vertically with
Vin = 24V and air flowing from pin 3 to pin 1 at a rate of 200
LFM (1.0 m/s).
Load Current [Adc]
012345
P
ower
Di
ss
i
pa
ti
on
[W]
0.00
2.00
4.00
6.00
8.00
10.00
70 C
55 C
40 C
Fig. 12V.8: Power dissipation vs. load current and ambient
temperature for SQ24T/S04120 converter mounted vertically
with Vin = 24V and air flowing from pin 3 to pin 1 at a rate of
200 LFM (1.0 m/s).
SQ24 Series Data Sheet
SQ24 Family DS Ver 5 05-14-04 USA Toll Free 866 WOW-didt Page 11 of 70
SQ24T/S04120 (12 Volts Out)
Fig. 12V.9: Turn-on transient at full rated load current (resis-
tive) with no output capacitor at Vin = 24V, triggered via
ON/OFF pin. Top trace: ON/OFF signal (5 V/div.). Bottom
trace: output voltage (5 V/div.). Time scale: 1 ms/div.
Fig. 12V.11: Output voltage response to load current step-
change (1A – 2A – 1A) at Vin = 24V. Top trace: output voltage
(200 mV/div.). Bottom trace: load current (1 A/div.). Current
slew rate: 0.1 A/µs. Co = 1 µF ceramic. Time scale: 0.5 ms/div.
Fig. 12V.10: Turn-on transient at full rated load current (resis-
tive) plus 1,000µF at Vin = 24V, triggered via ON/OFF pin. Top
trace: ON/OFF signal (5 V/div.). Bottom trace: output voltage
(5 V/div.). Time scale: 2 ms/div.
Fig. 12V.12: Output voltage response to load current step-
change (1A – 2A – 1A) at Vin = 24V. Top trace: output voltage
(200 mV/div.). Bottom trace: load current (1 A/div.). Current
slew rate: 5 A/µs. Co = 1 µF ceramic. Time scale: 0.5 ms/div.
SQ24 Series Data Sheet
SQ24 Family DS Ver 5 05-14-04 USA Toll Free 866 WOW-didt Page 12 of 70
SQ24T/S04120 (12 Volts Out)
Fig. 12V.13: Output voltage ripple (50 mV/div.) at full rated
load current into a resistive load with Co = 10 µF tantalum +
1uF ceramic and Vin = 24V. Time scale: 1 µs/div.
Fig. 12V.15: Input reflected ripple current, ic (100 mA/div.),
measured at input terminals at full rated load current and Vin =
24V. Refer to Fig. 12V.14 for test setup. Time scale: 1 µs/div.
Vout
Vsource
i
S
i
C
1 µF
ceramic
capacitor
10 µH
source
inductance
Semi
Q
TM
Family
DC/DC
Converter
33 µF
ESR <1
electrolytic
capacitor
Ω
Fig. 12V.14: Test Set-up for measuring input reflected ripple
currents, ic and is.
Fig. 12V.16: Input reflected ripple current, is (10 mA/div.),
measured through 10µH at the source at full rated load current
and Vin = 24V. Refer to Fig. 12V.14 for test setup. Time scale:
1µs/div.
SQ24 Series Data Sheet
SQ24 Family DS Ver 5 05-14-04 USA Toll Free 866 WOW-didt Page 13 of 70
SQ24T/S04120 (12 Volts Out)
14
6
15
Iout [Adc]
Vout [Vdc]
0
0
10
5
23 5
Fig. 12V.17: Output voltage vs. load current showing current
limit point and converter shutdown point. Input voltage has al-
most no effect on current limit characteristic.
Fig. 12V.18: Load current (top trace, 5 A/div., 20 ms/div.) into
a 10 mΩ short circuit during restart, at Vin = 24V. Bottom trace
(5 A/div., 1 ms/div.) is an expansion of the on-time portion of
the top trace.
SQ24 Series Data Sheet
SQ24 Family DS Ver 5 05-14-04 USA Toll Free 866 WOW-didt Page 14 of 70
Electrical Specifications: SQ24T/S05080 (8.0 Volts Out)
Conditions: TA=25ºC, Airflow=300 LFM (1.5 m/s), Vin=24 Vdc, Vout=8.0 Vdc unless otherwise specified.
PARAMETER NOTES MIN TYP MAX UNITS
INPUT CHARACTERISTICS
Maximum Input Current 5.3 Adc, 8.0 Vdc Out @ 18 Vdc In 2.8 Adc
Input Stand-by Current Vin = 24 V, converter disabled 2.6 mAdc
Input No Load Current (0 load on the output) Vin = 24 V, converter enabled 68 mAdc
Input Reflected-Ripple Current 25MHz bandwidth 6 mAPK-PK
Input Voltage Ripple Rejection 120Hz TBD dB
OUTPUT CHARACTERISTICS
Output Voltage Set Point (no load) 7.920 8.000 8.080 Vdc
Output Regulation
Over Line ±4 ±10 mV
Over Load ±4 ±10 mV
Output Voltage Range Over line, load and temperature2 7.880 8.120 Vdc
Output Ripple and Noise - 25MHz bandwidth Full load + 10 µF tantalum + 1 µF ceramic 70 100 mVPK-PK
External Load Capacitance Plus full load (resistive) 2200 µF
Output Current Range 0 5.3 Adc
Current Limit Inception Non-latching 6.25 6.75 Adc
Peak Short-Circuit Current Non-latching. Short=10m. 10 12 A
RMS Short-Circuit Current Non-latching 1 Arms
DYNAMIC RESPONSE
Load Change 25% of Iout Max, di/dt = 0.1 A/µS Co = 1 µF ceramic 160 mV
di/dt = 5 A/µS Co = 94 µF tant. + 1 µF ceramic 160 mV
Setting Time to 1% 400 µs
EFFICIENCY
100% Load 85.5 %
50% Load 87 %
Additional Notes: 2. -40ºC to 85ºC
Ambient Temperature [°C]
20 30 40 50 60 70 80 90
Load Current [Adc]
0
1
2
3
4
5
6
500 LFM (2.5 m/s)
400 LFM (2.0 m/s)
300 LFM (1.5 m/s)
200 LFM (1.0 m/s)
100 LFM (0.5 m/s)
30 LFM (0.15 m/s)
Fig. 8.0V.1: Available load current vs. ambient air temperature
and airflow rates for SQ24T05080 converter with D height pins
mounted vertically with Vin = 24 V, air flowing from pin 3 to pin
1 and maximum FET temperature ≤ 120°C.
Load Current [Adc]
0123456
Efficiency
0.65
0.70
0.75
0.80
0.85
0.90
0.95
36 V
24 V
18 V
Fig. 8.0V.2: Efficiency vs. load current and input voltage for
SQ24T/S05080 converter mounted vertically with air flowing from
pin 3 to pin 1 at a rate of 300 LFM (1.5 m/s) and Ta = 25°C.
SQ24 Series Data Sheet
SQ24 Family DS Ver 5 05-14-04 USA Toll Free 866 WOW-didt Page 15 of 70
Electrical Specifications: SQ24T/S08060 (6.0 Volts Out)
Conditions: TA=25ºC, Airflow=300 LFM (1.5 m/s), Vin=24Vdc, Vout=6.0 Vdc unless otherwise specified.
PARAMETER NOTES MIN TYP MAX UNITS
INPUT CHARACTERISTICS
Maximum Input Current 8 Adc, 6.0 Vdc Out @ 18 Vdc In 3.1 Adc
Input Stand-by Current Vin = 24V, converter disabled 2.6 mAdc
Input No Load Current (0 load on the output) Vin = 24V, converter enabled 88 mAdc
Input Reflected-Ripple Current 25MHz bandwidth 6 mAPK-PK
Input Voltage Ripple Rejection 120Hz TBD dB
OUTPUT CHARACTERISTICS
Output Voltage Set Point (no load) 5.940 6.000 6.060 Vdc
Output Regulation
Over Line ±2 ±5 mV
Over Load ±2 ±5 mV
Output Voltage Range Over line, load and temperature2 5.910 6.090 Vdc
Output Ripple and Noise - 25MHz bandwidth Full load + 10 µF tantalum + 1 µF ceramic 45 60 mVPK-PK
External Load Capacitance Plus full load (resistive) 10,000 µF
Output Current Range 0 8 Adc
Current Limit Inception Non-latching 10 11.5 Adc
Peak Short-Circuit Current Non-latching. Short=10m. 15 25 A
RMS Short-Circuit Current Non-latching 2.5 Arms
DYNAMIC RESPONSE
Load Change 25% of Iout Max, di/dt = 0.1 A/µS Co = 1 µF ceramic 100 mV
di/dt = 5 A/µS Co = 450 µF tant. + 1 µF ceramic 80 mV
Setting Time to 1% 200 µs
EFFICIENCY
100% Load 89 %
50% Load 89 %
Additional Notes: 2. -40ºC to 85ºC
SQ24 Series Data Sheet
SQ24 Family DS Ver 5 05-14-04 USA Toll Free 866 WOW-didt Page 16 of 70
SQ24T/S08060 (6.0 Volts Out)
Ambient Temperature [°C]
20 30 40 50 60 70 80 90
Load Current [Adc]
0
2
4
6
8
10
500 LFM (2.5 m/s)
400 LFM (2.0 m/s)
300 LFM (1.5 m/s)
200 LFM (1.0 m/s)
100 LFM (0.5 m/s)
30 LFM (0.15 m/s)
Fig. 6.0V.1: Available load current vs. ambient air temperature
and airflow rates for SQ24T08060 converter with B height pins
mounted vertically with Vin = 24V, air flowing from pin 3 to pin
1 and maximum FET temperature ≤ 120°C.
Ambient Temperature [°C]
20 30 40 50 60 70 80 90
Load Current [Adc]
0
2
4
6
8
10
500 LFM (2.5 m/s)
400 LFM (2.0 m/s)
300 LFM (1.5 m/s)
200 LFM (1.0 m/s)
100 LFM (0.5 m/s)
30 LFM (0.15 m/s)
Fig. 6.0V.3: Available load current vs. ambient temperature
and airflow rates for SQ24S08060 converter mounted vertically
with Vin = 24V, air flowing from pin 3 to pin 1 and maximum
FET temperature ≤ 120°C.
Ambient Temperature [°C]
20 30 40 50 60 70 80 90
Load Current [Adc]
0
2
4
6
8
10
500 LFM (2.5 m/s)
400 LFM (2.0 m/s)
300 LFM (1.5 m/s)
200 LFM (1.0 m/s)
100 LFM (0.5 m/s)
30 LFM (0.15 m/s)
Fig. 6.0V.2: Available load current vs. ambient air temperature
and airflow rates for SQ24T08060 converter with B height pins
mounted horizontally with Vin = 24V, air flowing from pin 3 to
pin 1 and maximum FET temperature ≤ 120°C.
Ambient Temperature [°C]
20 30 40 50 60 70 80 90
Load Current [Adc]
0
2
4
6
8
10
500 LFM (2.5 m/s)
400 LFM (2.0 m/s)
300 LFM (1.5 m/s)
200 LFM (1.0 m/s)
100 LFM (0.5 m/s)
30 LFM (0.15 m/s)
Fig. 6.0V.4: Available load current vs. ambient temperature
and airflow rates for SQ24S08060 converter mounted horizon-
tally with Vin = 24V, air flowing from pin 3 to pin 1 and maxi-
mum FET temperature ≤ 120°C.
SQ24 Series Data Sheet
SQ24 Family DS Ver 5 05-14-04 USA Toll Free 866 WOW-didt Page 17 of 70
SQ24T/S08060 (6.0 Volts Out)
Load Current [Adc]
0246810
Efficiency
0.65
0.70
0.75
0.80
0.85
0.90
0.95
36 V
24 V
18 V
Fig. 6.0V.5: Efficiency vs. load current and input voltage for
SQ24T/S08060 converter mounted vertically with air flowing
from pin 3 to pin 1 at a rate of 300 LFM (1.5 m/s) and Ta =
25°C.
Load Current [Adc]
0246810
P
ower
Di
ss
i
pa
ti
on
[W]
0.00
2.00
4.00
6.00
8.00
10.00
72 V
48 V
36 V
Fig. 6.0V.7: Power dissipation vs. load current and ambient
temperature for SQ24T/S08060 converter mounted vertically
with air flowing from pin 3 to pin 1 at a rate of 300 LFM (1.5
m/s) and Ta = 25°C.
Load Current [Adc]
0246810
Efficiency
0.65
0.70
0.75
0.80
0.85
0.90
0.95
70 C
55 C
40 C
Fig. 6.0V.6: Efficiency vs. load current and ambient tempera-
ture for SQ24T/S08060 converter mounted vertically with
Vin = 24V and air flowing from pin 3 to pin 1 at a rate of 200
LFM (1.0 m/s).
Load Current [Adc]
0246810
P
ower
Di
ss
i
pa
ti
on
[W]
0.00
2.00
4.00
6.00
8.00
10.00
70 C
55 C
40 C
Fig. 6.0V.8: Power dissipation vs. load current and ambient
temperature for SQ24T/S08060 converter mounted vertically
with Vin = 24V and air flowing from pin 3 to pin 1 at a rate of
200 LFM (1.0 m/s).
SQ24 Series Data Sheet
SQ24 Family DS Ver 5 05-14-04 USA Toll Free 866 WOW-didt Page 18 of 70
SQ24T/S08060 (6.0 Volts Out)
Fig. 6.0V.9: Turn-on transient at full rated load current (resis-
tive) with no output capacitor at Vin = 24V, triggered via
ON/OFF pin. Top trace: ON/OFF signal (5 V/div.). Bottom
trace: output voltage (2 V/div.). Time scale: 1 ms/div.
Fig. 6.0V.11: Output voltage response to load current step-
change (2A – 4A – 2A) at Vin = 24V. Top trace: output voltage
(100mV/div.). Bottom trace: load current (2A/div.). Current slew
rate: 0.1 A/µs. Co = 1 µF ceramic. Time scale: 0.2 ms/div.
Fig. 6.0V.10: Turn-on transient at full rated load current (resis-
tive) plus 10,000µF at Vin = 24V, triggered via ON/OFF pin.
Top trace: ON/OFF signal (5 V/div.). Bottom trace: output volt-
age (2 V/div.). Time scale: 2 ms/div.
Fig. 6.0V.12: Output voltage response to load current step-
change (2A – 4A – 2A) at Vin = 24V. Top trace: output voltage
(100mV/div.). Bottom trace: load current (2A/div.). Current slew
rate: 5 A/µs. Co = 450 µF tantalum + 1 µF ceramic. Time scale:
0.2 ms/div.
SQ24 Series Data Sheet
SQ24 Family DS Ver 5 05-14-04 USA Toll Free 866 WOW-didt Page 19 of 70
SQ24T/S08060 (6.0 Volts Out)
Fig. 6.0V.13: Output voltage ripple (50 mV/div.) at full rated
load current into a resistive load with Co = 10 µF tantalum +
1uF ceramic and Vin = 24V. Time scale: 1 µs/div.
Fig. 6.0V.15: Input reflected ripple current, ic (100 mA/div.),
measured at input terminals at full rated load current and Vin =
24V. Refer to Fig. 6.0V.14 for test setup. Time scale: 1 µs/div.
Vout
Vsource
i
S
i
C
1 µF
ceramic
capacitor
10 µH
source
inductance
Semi
Q
TM
Family
DC/DC
Converter
33 µF
ESR <1
electrolytic
capacitor
Ω
Fig. 6.0V.14: Test Set-up for measuring input reflected ripple
currents, ic and is.
Fig. 6.0V.16: Input reflected ripple current, is (10 mA/div.),
measured through 10 µH at the source at full rated load current
and Vin = 24V. Refer to Fig. 6.0V.14 for test setup. Time scale:
1µs/div.
SQ24 Series Data Sheet
SQ24 Family DS Ver 5 05-14-04 USA Toll Free 866 WOW-didt Page 20 of 70
SQ24T/S08060 (6.0 Volts Out)
312
8
Iout [Adc]
Vout [Vdc]
0
0
4
2
69
6
Fig. 6.0V.17: Output voltage vs. load current showing current
limit point and converter shutdown point. Input voltage has al-
most no effect on current limit characteristic.
Fig. 6.0V.18: Load current (top trace, 20 A/div., 20 ms/div.)
into a 10 mΩ short circuit during restart, at Vin = 24V. Bottom
trace (20 A/div., 2 ms/div.) is an expansion of the on-time por-
tion of the top trace.
SQ24 Series Data Sheet
SQ24 Family DS Ver 5 05-14-04 USA Toll Free 866 WOW-didt Page 21 of 70
Electrical Specifications: SQ24T/S10050 (5.0 Volts Out)
Conditions: TA=25ºC, Airflow=300 LFM (1.5 m/s), Vin=24Vdc, Vout=5.0 Vdc unless otherwise specified.
PARAMETER NOTES MIN TYP MAX UNITS
INPUT CHARACTERISTICS
Maximum Input Current 10 Adc, 5.0 Vdc Out @ 18 Vdc In 3.3 Adc
Input Stand-by Current Vin = 24V, converter disabled 3 mAdc
Input No Load Current (0 load on the output) Vin = 24V, converter enabled 93 mAdc
Input Reflected-Ripple Current 25MHz bandwidth 6 mAPK-PK
Input Voltage Ripple Rejection 120Hz TBD dB
OUTPUT CHARACTERISTICS
Output Voltage Set Point (no load) 4.950 5.000 5.050 Vdc
Output Regulation
Over Line ±2 ±5 mV
Over Load ±2 ±5 mV
Output Voltage Range Over line, load and temperature2 4.925 5.075 Vdc
Output Ripple and Noise - 25MHz bandwidth Full load + 10 µF tantalum + 1 µF ceramic 45 80 mVPK-PK
External Load Capacitance Plus full load (resistive) 10,000 µF
Output Current Range 0 10 Adc
Current Limit Inception Non-latching 12.5 14 Adc
Peak Short-Circuit Current Non-latching. Short=10m. 20 30 A
RMS Short-Circuit Current Non-latching 3 Arms
DYNAMIC RESPONSE
Load Change 25% of Iout Max, di/dt = 0.1 A/µS Co = 1 µF ceramic 140 mV
di/dt = 5 A/µS Co = 450 µF tant. + 1 µF ceramic 90 mV
Setting Time to 1% 200 µs
EFFICIENCY
100% Load 86 %
50% Load 87 %
Additional Notes: 2. -40ºC to 85ºC
SQ24 Series Data Sheet
SQ24 Family DS Ver 5 05-14-04 USA Toll Free 866 WOW-didt Page 22 of 70
SQ24T/S10050 (5.0 Volts Out)
Ambient Temperature [°C]
20 30 40 50 60 70 80 90
Load Current [Adc]
0
2
4
6
8
10
12
500 LFM (2.5 m/s)
400 LFM (2.0 m/s)
300 LFM (1.5 m/s)
200 LFM (1.0 m/s)
100 LFM (0.5 m/s)
30 LFM (0.15 m/s)
Fig. 5.0V.1: Available load current vs. ambient air temperature
and airflow rates for SQ24T10050 converter with B height pins
mounted vertically with Vin = 24V, air flowing from pin 3 to pin
1 and maximum FET temperature ≤ 120°C.
Ambient Temperature [°C]
20 30 40 50 60 70 80 90
Load Current [Adc]
0
2
4
6
8
10
12
500 LFM (2.5 m/s)
400 LFM (2.0 m/s)
300 LFM (1.5 m/s)
200 LFM (1.0 m/s)
100 LFM (0.5 m/s)
30 LFM (0.15 m/s)
Fig. 5.0V.3: Available load current vs. ambient temperature
and airflow rates for SQ24S10050 converter mounted vertically
with Vin = 24V, air flowing from pin 3 to pin 1 and maximum
FET temperature ≤ 120°C.
Ambient Temperature [°C]
20 30 40 50 60 70 80 90
Load Current [Adc]
0
2
4
6
8
10
12
500 LFM (2.5 m/s)
400 LFM (2.0 m/s)
300 LFM (1.5 m/s)
200 LFM (1.0 m/s)
100 LFM (0.5 m/s)
30 LFM (0.15 m/s)
Fig. 5.0V.2: Available load current vs. ambient air temperature
and airflow rates for SQ24T10050 converter with B height pins
mounted horizontally with Vin = 24V, air flowing from pin 3 to
pin 1 and maximum FET temperature ≤ 120°C.
Ambient Temperature [°C]
20 30 40 50 60 70 80 90
Load Current [Adc]
0
2
4
6
8
10
12
500 LFM (2.5 m/s)
400 LFM (2.0 m/s)
300 LFM (1.5 m/s)
200 LFM (1.0 m/s)
100 LFM (0.5 m/s)
30 LFM (0.15 m/s)
Fig. 5.0V.4: Available load current vs. ambient temperature
and airflow rates for SQ24S10050 converter mounted horizon-
tally with Vin = 24V, air flowing from pin 3 to pin 1 and maxi-
mum FET temperature ≤ 120°C.
SQ24 Series Data Sheet
SQ24 Family DS Ver 5 05-14-04 USA Toll Free 866 WOW-didt Page 23 of 70
SQ24T/S10050 (5.0 Volts Out)
Load Current [Adc]
024681012
Efficiency
0.65
0.70
0.75
0.80
0.85
0.90
0.95
36 V
24 V
18 V
Fig. 5.0V.5: Efficiency vs. load current and input voltage for
SQ24T/S10050 converter mounted vertically with air flowing
from pin 3 to pin 1 at a rate of 300 LFM (1.5 m/s) and Ta =
25°C.
Load Current [Adc]
024681012
P
ower
Di
ss
i
pa
ti
on
[W]
0.00
2.00
4.00
6.00
8.00
10.00
36 V
24 V
18 V
Fig. 5.0V.7: Power dissipation vs. load current and input volt-
age for SQ24T/S10050 converter mounted vertically with air
flowing from pin 3 to pin 1 at a rate of 300 LFM (1.5 m/s) and
Ta = 25°C.
Load Current [Adc]
024681012
Efficiency
0.65
0.70
0.75
0.80
0.85
0.90
0.95
70 C
55 C
40 C
Fig. 5.0V.6: Efficiency vs. load current and ambient tempera-
ture for SQ24T/S10050 converter mounted vertically with
Vin = 24V and air flowing from pin 3 to pin 1 at a rate of 200
LFM (1.0 m/s).
Load Current [Adc]
024681012
P
ower
Di
ss
i
pa
ti
on
[W]
0.00
2.00
4.00
6.00
8.00
10.00
70 C
55 C
40 C
Fig. 5.0V.8: Power dissipation vs. load current and ambient
temperature for SQ24T/S10050 converter mounted vertically
with Vin = 24V and air flowing from pin 3 to pin 1 at a rate of
200 LFM (1.0 m/s).
SQ24 Series Data Sheet
SQ24 Family DS Ver 5 05-14-04 USA Toll Free 866 WOW-didt Page 24 of 70
SQ24T/S10050 (5.0 Volts Out)
Fig. 5.0V.9: Turn-on transient at full rated load current (resis-
tive) with no output capacitor at Vin = 24V, triggered via
ON/OFF pin. Top trace: ON/OFF signal (5 V/div.). Bottom
trace: output voltage (2 V/div.). Time scale: 2 ms/div.
Fig. 5.0V.11: Output voltage response to load current step-
change (2.5A – 5A – 2.5A) at Vin = 24V. Top trace: output
voltage (100 mV/div.). Bottom trace: load current (2 A/div.).
Current slew rate: 0.1 A/µs. Co = 1 µF ceramic. Time scale: 0.2
ms/div.
Fig. 5.0V.10: Turn-on transient at full rated load current (resis-
tive) plus 10,000 µF at Vin = 24V, triggered via ON/OFF pin.
Top trace: ON/OFF signal (5 V/div.). Bottom trace: output volt-
age (2 V/div.). Time scale: 2 ms/div.
Fig. 5.0V.12: Output voltage response to load current step-
change (2.5A – 5A – 2.5A) at Vin = 24V. Top trace: output
voltage (100 mV/div.). Bottom trace: load current (2 A/div.).
Current slew rate: 5 A/µs. Co = 450 µF tantalum + 1 µF ce-
ramic. Time scale: 0.2 ms/div.
SQ24 Series Data Sheet
SQ24 Family DS Ver 5 05-14-04 USA Toll Free 866 WOW-didt Page 25 of 70
SQ24T/S10050 (5.0 Volts Out)
Fig. 5.0V.13: Output voltage ripple (20 mV/div.) at full rated
load current into a resistive load with Co = 10 µF tantalum +
1uF ceramic and Vin = 24V. Time scale: 1 µs/div.
Fig. 5.0V.15: Input reflected ripple current, ic (100 mA/div.),
measured at input terminals at full rated load current and Vin =
24V. Refer to Fig. 5.0V.14 for test setup. Time scale: 1 µs/div.
Vout
Vsource
i
S
i
C
1 µF
ceramic
capacitor
10 µH
source
inductance
Semi
Q
TM
Family
DC/DC
Converter
33 µF
ESR <1
electrolytic
capacitor
Ω
Fig. 5.0V.14: Test Set-up for measuring input reflected ripple
currents, ic and is.
Fig. 5.0V.16: Input reflected ripple current, is (10 mA/div.),
measured through 10 µH at the source at full rated load current
and Vin = 24V. Refer to Fig. 5.0V.14 for test setup. Time scale:
1µs/div.
SQ24 Series Data Sheet
SQ24 Family DS Ver 5 05-14-04 USA Toll Free 866 WOW-didt Page 26 of 70
SQ24T/S10050 (5.0 Volts Out)
515
6.0
Iout [Adc]
Vout [Vdc]
0
0
5.0
2.0
1.0
10
4.0
3.0
Fig. 5.0V.17: Output voltage vs. load current showing current
limit point and converter shutdown point. Input voltage has al-
most no effect on current limit characteristic.
Fig. 5.0V.18: Load current (top trace, 10 A/div., 20 ms/div.)
into a 10 mΩ short circuit during restart, at Vin = 24V. Bottom
trace (10 A/div., 1 ms/div.) is an expansion of the on-time por-
tion of the top trace.
SQ24 Series Data Sheet
SQ24 Family DS Ver 5 05-14-04 USA Toll Free 866 WOW-didt Page 27 of 70
Electrical Specifications: SQ24T/S15033 (3.3 Volts Out)
Conditions: TA=25ºC, Airflow=300 LFM (1.5 m/s), Vin=24Vdc, Vout=3.3 Vdc unless otherwise specified.
PARAMETER NOTES MIN TYP MAX UNITS
INPUT CHARACTERISTICS
Maximum Input Current 15 Adc, 3.3 Vdc Out @ 18 Vdc In 3.2 Adc
Input Stand-by Current Vin = 24V, converter disabled 3 mAdc
Input No Load Current (0 load on the output) Vin = 24V, converter enabled 100 mAdc
Input Reflected-Ripple Current 25MHz bandwidth 6 mAPK-PK
Input Voltage Ripple Rejection 120Hz TBD dB
OUTPUT CHARACTERISTICS
Output Voltage Set Point (no load) 3.267 3.300 3.333 Vdc
Output Regulation
Over Line ±2 ±5 mV
Over Load ±2 ±5 mV
Output Voltage Range Over line, load and temperature2 3.250 3.350 Vdc
Output Ripple and Noise - 25MHz bandwidth Full load + 10 µF tantalum + 1 µF ceramic 30 50 mVPK-PK
External Load Capacitance Plus full load (resistive) 15,000 µF
Output Current Range 0 15 Adc
Current Limit Inception Non-latching 18 20 Adc
Peak Short-Circuit Current Non-latching. Short=10m. 30 40 A
RMS Short-Circuit Current Non-latching 5.3 Arms
DYNAMIC RESPONSE
Load Change 25% of Iout Max, di/dt = 0.1 A/µS Co = 1 µF ceramic 100 mV
di/dt = 5 A/µS Co = 450 µF tant. + 1 µF ceramic 100 mV
Setting Time to 1% 100 µs
EFFICIENCY
100% Load 88 %
50% Load 88 %
Additional Notes: 2. -40ºC to 85ºC
SQ24 Series Data Sheet
SQ24 Family DS Ver 5 05-14-04 USA Toll Free 866 WOW-didt Page 28 of 70
SQ24T/S15033 (3.3 Volts Out)
Ambient Temperature [°C]
20 30 40 50 60 70 80 90
Load Current [Adc]
0
5
10
15
20
500 LFM (2.5 m/s)
400 LFM (2.0 m/s)
300 LFM (1.5 m/s)
200 LFM (1.0 m/s)
100 LFM (0.5 m/s)
30 LFM (0.15 m/s)
Fig. 3.3V.1: Available load current vs. ambient air temperature
and airflow rates for SQ24T15033 converter with B height pins
mounted vertically with Vin = 24V, air flowing from pin 3 to pin
1 and maximum FET temperature ≤ 120°C.
Ambient Temperature [°C]
20 30 40 50 60 70 80 90
Load Current [Adc]
0
5
10
15
20
500 LFM (2.5 m/s)
400 LFM (2.0 m/s)
300 LFM (1.5 m/s)
200 LFM (1.0 m/s)
100 LFM (0.5 m/s)
30 LFM (0.15 m/s)
Fig. 3.3V.3: Available load current vs. ambient temperature
and airflow rates for SQ24S15033 converter mounted vertically
with Vin = 24V, air flowing from pin 3 to pin 1 and maximum
FET temperature ≤ 120°C.
Ambient Temperature [°C]
20 30 40 50 60 70 80 90
Load Current [Adc]
0
5
10
15
20
500 LFM (2.5 m/s)
400 LFM (2.0 m/s)
300 LFM (1.5 m/s)
200 LFM (1.0 m/s)
100 LFM (0.5 m/s)
30 LFM (0.15 m/s)
Fig. 3.3V.2: Available load current vs. ambient air temperature
and airflow rates for SQ24T15033 converter with B height pins
mounted horizontally with Vin = 24V, air flowing from pin 3 to
pin 1 and maximum FET temperature ≤ 120°C.
Ambient Temperature [°C]
20 30 40 50 60 70 80 90
Load Current [Adc]
0
5
10
15
20
500 LFM (2.5 m/s)
400 LFM (2.0 m/s)
300 LFM (1.5 m/s)
200 LFM (1.0 m/s)
100 LFM (0.5 m/s)
30 LFM (0.15 m/s)
Fig. 3.3V.4: Available load current vs. ambient temperature
and airflow rates for SQ24S15033 converter mounted horizon-
tally with Vin = 24V, air flowing from pin 3 to pin 1 and maxi-
mum FET temperature ≤ 120°C.
SQ24 Series Data Sheet
SQ24 Family DS Ver 5 05-14-04 USA Toll Free 866 WOW-didt Page 29 of 70
SQ24T/S15033 (3.3 Volts Out)
Load Current [Adc]
0246810121416
Efficiency
0.65
0.70
0.75
0.80
0.85
0.90
0.95
36 V
24 V
18 V
Fig. 3.3V.5: Efficiency vs. load current and input voltage for
SQ24T/S15033 converter mounted vertically with air flowing
from pin 3 to pin 1 at a rate of 300 LFM (1.5 m/s) and Ta =
25°C.
Load Current [Adc]
0246810121416
Power Dissipation [W]
0.00
2.00
4.00
6.00
8.00
36 V
24 V
18 V
Fig. 3.3V.7: Power dissipation vs. load current and input volt-
age for SQ24T/S15033 converter mounted vertically with air
flowing from pin 3 to pin 1 at a rate of 300 LFM (1.5 m/s) and
Ta = 25°C.
Load Current [Adc]
0246810121416
Efficiency
0.65
0.70
0.75
0.80
0.85
0.90
0.95
70 C
55 C
40 C
Fig. 3.3V.6: Efficiency vs. load current and ambient tempera-
ture for SQ24T/S15033 converter mounted vertically with
Vin = 24V and air flowing from pin 3 to pin 1 at a rate of 200
LFM (1.0 m/s).
Load Current [Adc]
0246810121416
Power Dissipation [W]
0.00
2.00
4.00
6.00
8.00
70 C
55 C
40 C
Fig. 3.3V.8: Power dissipation vs. load current and ambient
temperature for SQ24T/S15033 converter mounted vertically
with Vin = 24V and air flowing from pin 3 to pin 1 at a rate of
200 LFM (1.0 m/s).
SQ24 Series Data Sheet
SQ24 Family DS Ver 5 05-14-04 USA Toll Free 866 WOW-didt Page 30 of 70
SQ24T/S15033 (3.3 Volts Out)
Fig. 3.3V.9: Turn-on transient at full rated load current (resis-
tive) with no output capacitor at Vin = 24V, triggered via
ON/OFF pin. Top trace: ON/OFF signal (5 V/div.). Bottom
trace: output voltage (1 V/div.). Time scale: 2 ms/div.
Fig. 3.3V.11: Output voltage response to load current step-
change (3.75A – 7.5A – 3.75A) at Vin = 24V. Top trace: output
voltage (100 mV/div.). Bottom trace: load current (5 A/div.).
Current slew rate: 0.1 A/µs. Co = 1 µF ceramic. Time scale:
0.2 ms/div.
Fig. 3.3V.10: Turn-on transient at full rated load current (resis-
tive) plus 10,000 µF at Vin = 24V, triggered via ON/OFF pin.
Top trace: ON/OFF signal (5 V/div.). Bottom trace: output volt-
age (1 V/div.). Time scale: 2 ms/div.
Fig. 3.3V.12: Output voltage response to load current step-
change (3.75A – 7.5A – 3.75A) at Vin = 24V. Top trace: output
voltage (100 mV/div.). Bottom trace: load current (5 A/div.).
Current slew rate: 5 A/µs. Co = 450 µF tantalum + 1 µF ce-
ramic. Time scale: 0.2 ms/div.
SQ24 Series Data Sheet
SQ24 Family DS Ver 5 05-14-04 USA Toll Free 866 WOW-didt Page 31 of 70
SQ24T/S15033 (3.3 Volts Out)
Fig. 3.3V.13: Output voltage ripple (20 mV/div.) at full rated
load current into a resistive load with Co = 10 µF tantalum +
1uF ceramic and Vin = 24V. Time scale: 1 µs/div.
Fig. 3.3V.15: Input reflected ripple current, ic (100 mA/div.),
measured at input terminals at full rated load current and Vin =
24V. Refer to Fig. 3.3V.14 for test setup. Time scale: 1 µs/div.
Vout
Vsource
i
S
i
C
1 µF
ceramic
capacitor
10 µH
source
inductance
Semi
Q
TM
Family
DC/DC
Converter
33 µF
ESR <1
electrolytic
capacitor
Ω
Fig. 3.3V.14: Test Set-up for measuring input reflected ripple
currents, ic and is.
Fig. 3.3V.16: Input reflected ripple current, is (10 mA/div.),
measured through 10 µH at the source at full rated load current
and Vin = 24V. Refer to Fig. 3.3V.14 for test setup. Time scale:
1µs/div.
SQ24 Series Data Sheet
SQ24 Family DS Ver 5 05-14-04 USA Toll Free 866 WOW-didt Page 32 of 70
SQ24T/S15033 (3.3 Volts Out)
20
5
4
Iout [Adc]
Vout [Vdc]
0
0
2
1
10 15
3
Fig. 3.3V.17: Output voltage vs. load current showing current
limit point and converter shutdown point. Input voltage has al-
most no effect on current limit characteristic.
Fig. 3.3V.18: Load current (top trace, 20 A/div., 20 ms/div.)
into a 10 mΩ short circuit during restart, at Vin = 24V. Bottom
trace (20 A/div., 1 ms/div.) is an expansion of the on-time por-
tion of the top trace.
SQ24 Series Data Sheet
SQ24 Family DS Ver 5 05-14-04 USA Toll Free 866 WOW-didt Page 33 of 70
Electrical Specifications: SQ24T/S15025 (2.5 Volts Out)
Conditions: TA=25ºC, Airflow=300 LFM (1.5 m/s), Vin=24Vdc, Vout=2.5 Vdc unless otherwise specified.
PARAMETER NOTES MIN TYP MAX UNITS
INPUT CHARACTERISTICS
Maximum Input Current 15 Adc, 2.5 Vdc Out @ 18 Vdc In 2.5 Adc
Input Stand-by Current Vin = 24V, converter disabled 3 mAdc
Input No Load Current (0 load on the output) Vin = 24V, converter enabled 67 mAdc
Input Reflected-Ripple Current 25MHz bandwidth 6 mAPK-PK
Input Voltage Ripple Rejection 120Hz TBD dB
OUTPUT CHARACTERISTICS
Output Voltage Set Point (no load) 2.475 2.500 2.525 Vdc
Output Regulation
Over Line ±2 ±5 mV
Over Load ±2 ±5 mV
Output Voltage Range Over line, load and temperature2 2.462 2.538 Vdc
Output Ripple and Noise - 25MHz bandwidth Full load + 10 µF tantalum + 1 µF ceramic 30 50 mVPK-PK
External Load Capacitance Plus full load (resistive) 15,000 µF
Output Current Range 0 15 Adc
Current Limit Inception Non-latching 18 20 Adc
Peak Short-Circuit Current Non-latching. Short=10m. 30 40 A
RMS Short-Circuit Current Non-latching 5.3 Arms
DYNAMIC RESPONSE
Load Change 25% of Iout Max, di/dt = 0.1 A/µS Co = 1 µF ceramic) 110 mV
di/dt = 5 A/µS Co = 450 µF tant. + 1 µF ceramic 120 mV
Setting Time to 1% 150 µs
EFFICIENCY
100% Load 86.5 %
50% Load 87 %
Additional Notes: 2. -40ºC to 85ºC
SQ24 Series Data Sheet
SQ24 Family DS Ver 5 05-14-04 USA Toll Free 866 WOW-didt Page 34 of 70
SQ24T/S15025 (2.5 Volts Out)
Ambient Temperature [°C]
20 30 40 50 60 70 80 90
Load Current [Adc]
0
5
10
15
20
500 LFM (2.5 m/s)
400 LFM (2.0 m/s)
300 LFM (1.5 m/s)
200 LFM (1.0 m/s)
100 LFM (0.5 m/s)
30 LFM (0.15 m/s)
Fig. 2.5V.1: Available load current vs. ambient air temperature
and airflow rates for SQ24T15025 converter with B height pins
mounted vertically with Vin = 24V, air flowing from pin 3 to pin
1 and maximum FET temperature ≤ 120°C.
Ambient Temperature [°C]
20 30 40 50 60 70 80 90
Load Current [Adc]
0
5
10
15
20
500 LFM (2.5 m/s)
400 LFM (2.0 m/s)
300 LFM (1.5 m/s)
200 LFM (1.0 m/s)
100 LFM (0.5 m/s)
30 LFM (0.15 m/s)
Fig. 2.5V.3: Available load current vs. ambient temperature
and airflow rates for SQ24S15025 converter mounted vertically
with Vin = 24V, air flowing from pin 3 to pin 1 and maximum
FET temperature ≤ 120°C.
Ambient Temperature [°C]
20 30 40 50 60 70 80 90
Load Current [Adc]
0
5
10
15
20
500 LFM (2.5 m/s)
400 LFM (2.0 m/s)
300 LFM (1.5 m/s)
200 LFM (1.0 m/s)
100 LFM (0.5 m/s)
30 LFM (0.15 m/s)
Fig. 2.5V.2: Available load current vs. ambient air temperature
and airflow rates for SQ24T15025 converter with B height pins
mounted horizontally with Vin = 24V, air flowing from pin 3 to
pin 1 and maximum FET temperature ≤ 120°C.
Ambient Temperature [°C]
20 30 40 50 60 70 80 90
Load Current [Adc]
0
5
10
15
20
500 LFM (2.5 m/s)
400 LFM (2.0 m/s)
300 LFM (1.5 m/s)
200 LFM (1.0 m/s)
100 LFM (0.5 m/s)
30 LFM (0.15 m/s)
Fig. 2.5V.4: Available load current vs. ambient temperature
and airflow rates for SQ24S15025 converter mounted horizon-
tally with Vin = 24V, air flowing from pin 3 to pin 1 and maxi-
mum FET temperature ≤ 120°C.
SQ24 Series Data Sheet
SQ24 Family DS Ver 5 05-14-04 USA Toll Free 866 WOW-didt Page 35 of 70
SQ24T/S15025 (2.5 Volts Out)
Load Current [Adc]
0246810121416
Efficiency
0.65
0.70
0.75
0.80
0.85
0.90
0.95
36 V
24 V
18 V
Fig. 2.5V.5: Efficiency vs. load current and input voltage for
SQ24T/S15025 converter mounted vertically with air flowing
from pin 3 to pin 1 at a rate of 300 LFM (1.5 m/s) and Ta =
25°C.
Load Current [Adc]
0246810121416
Power Dissipation [W]
0.00
2.00
4.00
6.00
8.00
36 V
24 V
18 V
Fig. 2.5V.7: Power dissipation vs. load current and input volt-
age for SQ24T/S15025 converter mounted vertically with air
flowing from pin 3 to pin 1 at a rate of 300 LFM (1.5 m/s) and
Ta = 25°C.
Load Current [Adc]
0246810121416
Efficiency
0.65
0.70
0.75
0.80
0.85
0.90
0.95
70 C
55 C
40 C
Fig. 2.5V.6: Efficiency vs. load current and ambient tempera-
ture for SQ24T/S15025 converter mounted vertically with
Vin = 24V and air flowing from pin 3 to pin 1 at a rate of 200
LFM (1.0 m/s).
Load Current [Adc]
0246810121416
Power Dissipation [W]
0.00
2.00
4.00
6.00
8.00
70 C
55 C
40 C
Fig. 2.5V.8: Power dissipation vs. load current and ambient
temperature for SQ24T/S15025 converter mounted vertically
with Vin = 24V and air flowing from pin 3 to pin 1 at a rate of
200 LFM (1.0 m/s).
SQ24 Series Data Sheet
SQ24 Family DS Ver 5 05-14-04 USA Toll Free 866 WOW-didt Page 36 of 70
SQ24T/S15025 (2.5 Volts Out)
Fig. 2.5V.9: Turn-on transient at full rated load current (resis-
tive) with no output capacitor at Vin = 24V, triggered via
ON/OFF pin. Top trace: ON/OFF signal (5 V/div.). Bottom
trace: output voltage (1 V/div.). Time scale: 1 ms/div.
Fig. 2.5V.11: Output voltage response to load current step-
change (3.75 A – 7.5 A – 3.75 A) at Vin = 24V. Top trace: out-
put voltage (100 mV/div.). Bottom trace: load current (5 A/div.).
Current slew rate: 0.1 A/µs. Co = 1 µF ceramic. Time scale:
0.2 ms/div.
Fig. 2.5V.10: Turn-on transient at full rated load current (resis-
tive) plus 10,000 µF at Vin = 24V, triggered via ON/OFF pin.
Top trace: ON/OFF signal (5 V/div.). Bottom trace: output volt-
age (1 V/div.). Time scale: 1 ms/div.
Fig. 2.5V.12: Output voltage response to load current step-
change (3.75 A – 7.5 A – 3.75 A) at Vin = 24V. Top trace: out-
put voltage (100 mV/div.). Bottom trace: load current (5 A/div.).
Current slew rate: 5 A/µs. Co = 450 µF tantalum + 1 µF ce-
ramic. Time scale: 0.2 ms/div.
SQ24 Series Data Sheet
SQ24 Family DS Ver 5 05-14-04 USA Toll Free 866 WOW-didt Page 37 of 70
SQ24T/S15025 (2.5 Volts Out)
Fig. 2.5V.13: Output voltage ripple (20 mV/div.) at full rated
load current into a resistive load with Co = 10 µF tantalum +
1uF ceramic and Vin = 24V. Time scale: 1 µs/div.
Fig. 2.5V.15: Input reflected ripple current, ic (100 mA/div.),
measured at input terminals at full rated load current and Vin =
24V. Refer to Fig. 2.5V.14 for test setup. Time scale: 1 µs/div.
Vout
Vsource
i
S
i
C
1 µF
ceramic
capacitor
10 µH
source
inductance
Semi
Q
TM
Family
DC/DC
Converter
33 µF
ESR <1
electrolytic
capacitor
Ω
Fig. 2.5V.14: Test Set-up for measuring input reflected ripple
currents, ic and is.
Fig. 2.5V.16: Input reflected ripple current, is (10 mA/div.),
measured through 10 µH at the source at full rated load current
and Vin = 24V. Refer to Fig. 2.5V.14 for test setup. Time scale:
1µs/div.
SQ24 Series Data Sheet
SQ24 Family DS Ver 5 05-14-04 USA Toll Free 866 WOW-didt Page 38 of 70
SQ24T/S15025 (2.5 Volts Out)
520
3
Iout [Adc]
Vout [Vdc]
0
0
1
10 15
2
Fig. 2.5V.17: Output voltage vs. load current showing current
limit point and converter shutdown point. Input voltage has al-
most no effect on current limit characteristic.
Fig. 2.5V.18: Load current (top trace, 20 A/div., 20 ms/div.)
into a 10 mΩ short circuit during restart, at Vin = 24V. Bottom
trace (20 A/div., 1 ms/div.) is an expansion of the on-time por-
tion of the top trace.
SQ24 Series Data Sheet
SQ24 Family DS Ver 5 05-14-04 USA Toll Free 866 WOW-didt Page 39 of 70
Electrical Specifications: SQ24T/S15020 (2.0 Volts Out)
Conditions: TA=25ºC, Airflow=300 LFM (1.5 m/s), Vin=24Vdc, Vout=2.0 Vdc unless otherwise specified.
PARAMETER NOTES MIN TYP MAX UNITS
INPUT CHARACTERISTICS
Maximum Input Current 15 Adc, 2.0 Vdc Out @ 18 Vdc In 2 Adc
Input Stand-by Current Vin = 24V, converter disabled 3 mAdc
Input No Load Current (0 load on the output) Vin = 24V, converter enabled 57 mAdc
Input Reflected-Ripple Current 25MHz bandwidth 6 mAPK-PK
Input Voltage Ripple Rejection 120Hz TBD dB
OUTPUT CHARACTERISTICS
Output Voltage Set Point (no load) 1.98 2.000 2.02 Vdc
Output Regulation
Over Line ±2 ±5 mV
Over Load ±2 ±5 mV
Output Voltage Range Over line, load and temperature2 1.970 2.030 Vdc
Output Ripple and Noise - 25MHz bandwidth Full load + 10 µF tantalum + 1 µF ceramic 30 50 mVPK-PK
External Load Capacitance Plus full load (resistive) 15,000 µF
Output Current Range 0 15 Adc
Current Limit Inception Non-latching 18 20 Adc
Peak Short-Circuit Current Non-latching. Short=10m. 30 40 A
RMS Short-Circuit Current Non-latching 5.3 Arms
DYNAMIC RESPONSE
Load Change 25% of Iout Max, di/dt = 0.1 A/µS Co = 1 µF ceramic 100 mV
di/dt = 5 A/µS Co = 450 µF tant. + 1 µF ceramic 120 mV
Setting Time to 1% 150 µs
EFFICIENCY
100% Load 85 %
50% Load 85 %
Additional Notes: 2. -40ºC to 85ºC
SQ24 Series Data Sheet
SQ24 Family DS Ver 5 05-14-04 USA Toll Free 866 WOW-didt Page 40 of 70
SQ24T/S15020 (2.0 Volts Out)
Ambient Temperature [°C]
20 30 40 50 60 70 80 90
Load Current [Adc]
0
5
10
15
20
500 LFM (2.5 m/s)
400 LFM (2.0 m/s)
300 LFM (1.5 m/s)
200 LFM (1.0 m/s)
100 LFM (0.5 m/s)
30 LFM (0.15 m/s)
Fig. 2.0V.1: Available load current vs. ambient air temperature
and airflow rates for SQ24T15020 converter with B height pins
mounted vertically with Vin = 24V, air flowing from pin 3 to pin
1 and maximum FET temperature ≤ 120°C.
Ambient Temperature [°C]
20 30 40 50 60 70 80 90
Load Current [Adc]
0
5
10
15
20
500 LFM (2.5 m/s)
400 LFM (2.0 m/s)
300 LFM (1.5 m/s)
200 LFM (1.0 m/s)
100 LFM (0.5 m/s)
30 LFM (0.15 m/s)
Fig. 2.0V.3: Available load current vs. ambient temperature
and airflow rates for SQ24S15020 converter mounted vertically
with Vin = 24V, air flowing from pin 3 to pin 1 and maximum
FET temperature ≤ 120°C.
Ambient Temperature [°C]
20 30 40 50 60 70 80 90
Load Current [Adc]
0
5
10
15
20
500 LFM (2.5 m/s)
400 LFM (2.0 m/s)
300 LFM (1.5 m/s)
200 LFM (1.0 m/s)
100 LFM (0.5 m/s)
30 LFM (0.15 m/s)
Fig. 2.0V.2: Available load current vs. ambient air temperature
and airflow rates for SQ24T15020 converter with B height pins
mounted horizontally with Vin = 24V, air flowing from pin 3 to
pin 1 and maximum FET temperature ≤ 120°C.
Ambient Temperature [°C]
20 30 40 50 60 70 80 90
Load Current [Adc]
0
5
10
15
20
500 LFM (2.5 m/s)
400 LFM (2.0 m/s)
300 LFM (1.5 m/s)
200 LFM (1.0 m/s)
100 LFM (0.5 m/s)
30 LFM (0.15 m/s)
Fig. 2.0V.4: Available load current vs. ambient temperature
and airflow rates for SQ24S15020 converter mounted horizon-
tally with Vin = 24V, air flowing from pin 3 to pin 1 and maxi-
mum FET temperature ≤ 120°C.
SQ24 Series Data Sheet
SQ24 Family DS Ver 5 05-14-04 USA Toll Free 866 WOW-didt Page 41 of 70
SQ24T/S15020 (2.0 Volts Out)
Load Current [Adc]
0246810121416
Efficiency
0.65
0.70
0.75
0.80
0.85
0.90
0.95
36 V
24 V
18 V
Fig. 2.0V.5: Efficiency vs. load current and input voltage for
SQ24T/S15020 converter mounted vertically with air flowing
from pin 3 to pin 1 at a rate of 300 LFM (1.5 m/s) and Ta =
25°C.
Load Current [Adc]
0246810121416
Power Dissipation [W]
0.00
1.00
2.00
3.00
4.00
5.00
6.00
36 V
24 V
18 V
Fig. 2.0V.7: Power dissipation vs. load current and input volt-
age for SQ24T/S15020 converter mounted vertically with air
flowing from pin 3 to pin 1 at a rate of 300 LFM (1.5 m/s) and
Ta = 25°C.
Load Current [Adc]
0246810121416
Efficiency
0.65
0.70
0.75
0.80
0.85
0.90
0.95
70 C
55 C
40 C
Fig. 2.0V.6: Efficiency vs. load current and ambient tempera-
ture for SQ24T/S15020 converter mounted vertically with
Vin = 24V and air flowing from pin 3 to pin 1 at a rate of 200
LFM (1.0 m/s).
Load Current [Adc]
0246810121416
Power Dissipation [W]
0.00
1.00
2.00
3.00
4.00
5.00
6.00
70 C
55 C
40 C
Fig. 2.0V.8: Power dissipation vs. load current and ambient
temperature for SQ24T/S15020 converter mounted vertically
with Vin = 24V and air flowing from pin 3 to pin 1 at a rate of
200 LFM (1.0 m/s).
SQ24 Series Data Sheet
SQ24 Family DS Ver 5 05-14-04 USA Toll Free 866 WOW-didt Page 42 of 70
SQ24T/S15020 (2.0 Volts Out)
Fig. 2.0V.9: Turn-on transient at full rated load current (resis-
tive) with no output capacitor at Vin = 24V, triggered via
ON/OFF pin. Top trace: ON/OFF signal (5 V/div.). Bottom
trace: output voltage (1 V/div.). Time scale: 1 ms/div.
Fig. 2.0V.11: Output voltage response to load current step-
change (3.75A – 7.5A – 3.75A) at Vin = 24V. Top trace: output
voltage (100 mV/div.). Bottom trace: load current (5 A/div.).
Current slew rate: 0.1 A/µs. Co = 1 µF ceramic. Time scale:
0.2 ms/div.
Fig. 2.0V.10: Turn-on transient at full rated load current (resis-
tive) plus 10,000µF at Vin = 24V, triggered via ON/OFF pin.
Top trace: ON/OFF signal (5 V/div.). Bottom trace: output volt-
age (1 V/div.). Time scale: 1 ms/div.
Fig. 2.0V.12: Output voltage response to load current step-
change (3.75A – 7.5A – 3.75A) at Vin = 24V. Top trace: output
voltage (100 mV/div.). Bottom trace: load current (5 A/div.).
Current slew rate: 5 A/µs. Co = 450 µF tantalum + 1 µF ce-
ramic. Time scale: 0.2 ms/div.
SQ24 Series Data Sheet
SQ24 Family DS Ver 5 05-14-04 USA Toll Free 866 WOW-didt Page 43 of 70
SQ24T/S15020 (2.0 Volts Out)
Fig. 2.0V.13: Output voltage ripple (20 mV/div.) at full rated
load current into a resistive load with Co = 10 µF tantalum +
1uF ceramic and Vin = 24V. Time scale: 1 µs/div.
Fig. 2.0V.15: Input reflected ripple current, ic (100 mA/div.),
measured at input terminals at full rated load current and Vin =
24V. Refer to Fig. 2.0V.14 for test setup. Time scale: 1 µs/div.
Vout
Vsource
i
S
i
C
1 µF
ceramic
capacitor
10 µH
source
inductance
Semi
Q
TM
Family
DC/DC
Converter
33 µF
ESR <1
electrolytic
capacitor
Ω
Fig. 2.0V.14: Test Set-up for measuring input reflected ripple
currents, ic and is.
Fig. 2.0V.16: Input reflected ripple current, is (10 mA/div.),
measured through 10 µH at the source at full rated load current
and Vin = 24V. Refer to Fig. 2.0V.14 for test setup. Time scale:
1µs/div.
SQ24 Series Data Sheet
SQ24 Family DS Ver 5 05-14-04 USA Toll Free 866 WOW-didt Page 44 of 70
SQ24T/S15020 (2.0 Volts Out)
520
3
Iout [Adc]
Vout [Vdc]
0
0
1
10 15
2
Fig. 2.0V.17: Output voltage vs. load current showing current
limit point and converter shutdown point. Input voltage has al-
most no effect on current limit characteristic.
Fig. 2.0V.18: Load current (top trace, 20 A/div., 20 ms/div.)
into a 10 mΩ short circuit during restart, at Vin = 24V. Bottom
trace (20 A/div., 2 ms/div.) is an expansion of the on-time por-
tion of the top trace.
SQ24 Series Data Sheet
SQ24 Family DS Ver 5 05-14-04 USA Toll Free 866 WOW-didt Page 45 of 70
Electrical Specifications: SQ24T/S15018 (1.8 Volts Out)
Conditions: TA=25ºC, Airflow=300 LFM (1.5 m/s), Vin=24Vdc, Vout=1.8 Vdc unless otherwise specified.
PARAMETER NOTES MIN TYP MAX UNITS
INPUT CHARACTERISTICS
Maximum Input Current 15 Adc, 1.8 Vdc Out @ 18 Vdc In 1.8 Adc
Input Stand-by Current Vin = 24V, converter disabled 3 mAdc
Input No Load Current (0 load on the output) Vin = 24V, converter enabled 53 mAdc
Input Reflected-Ripple Current 25MHz bandwidth 6 mAPK-PK
Input Voltage Ripple Rejection 120Hz TBD dB
OUTPUT CHARACTERISTICS
Output Voltage Set Point (no load) 1.782 1.800 1.818 Vdc
Output Regulation
Over Line ±2 ±4 mV
Over Load ±2 ±5 mV
Output Voltage Range Over line, load and temperature2 1.773 1.827 Vdc
Output Ripple and Noise - 25MHz bandwidth Full load + 10 µF tantalum + 1 µF ceramic 30 50 mVPK-PK
External Load Capacitance Plus full load (resistive) 15,000 µF
Output Current Range 0 15 Adc
Current Limit Inception Non-latching 18 20 Adc
Peak Short-Circuit Current Non-latching. Short=10m. 30 40 A
RMS Short-Circuit Current Non-latching 5.3 Arms
DYNAMIC RESPONSE
Load Change 25% of Iout Max, di/dt = 0.1 A/µS Co = 1 µF ceramic 100 mV
di/dt = 5 A/µS Co = 450 µF tant. + 1 µF ceramic 120 mV
Setting Time to 1% 150 µs
EFFICIENCY
100% Load 84.5 %
50% Load 84 %
Additional Notes: 2. -40ºC to 85ºC
SQ24 Series Data Sheet
SQ24 Family DS Ver 5 05-14-04 USA Toll Free 866 WOW-didt Page 46 of 70
SQ24T/S15018 (1.8 Volts Out)
Ambient Temperature [°C]
20 30 40 50 60 70 80 90
Load Current [Adc]
0
5
10
15
20
500 LFM (2.5 m/s)
400 LFM (2.0 m/s)
300 LFM (1.5 m/s)
200 LFM (1.0 m/s)
100 LFM (0.5 m/s)
30 LFM (0.15 m/s)
Fig. 1.8V.1: Available load current vs. ambient air temperature
and airflow rates for SQ24T15018 converter with B height pins
mounted vertically with Vin = 24V, air flowing from pin 3 to pin
1 and maximum FET temperature ≤ 120°C.
Ambient Temperature [°C]
20 30 40 50 60 70 80 90
Load Current [Adc]
0
5
10
15
20
500 LFM (2.5 m/s)
400 LFM (2.0 m/s)
300 LFM (1.5 m/s)
200 LFM (1.0 m/s)
100 LFM (0.5 m/s)
30 LFM (0.15 m/s)
Fig. 1.8V.3: Available load current vs. ambient temperature
and airflow rates for SQ24S15018 converter mounted vertically
with Vin = 24V, air flowing from pin 3 to pin 1 and maximum
FET temperature ≤ 120°C.
Ambient Temperature [°C]
20 30 40 50 60 70 80 90
Load Current [Adc]
0
5
10
15
20
500 LFM (2.5 m/s)
400 LFM (2.0 m/s)
300 LFM (1.5 m/s)
200 LFM (1.0 m/s)
100 LFM (0.5 m/s)
30 LFM (0.15 m/s)
Fig. 1.8V.2: Available load current vs. ambient air temperature
and airflow rates for SQ24T15018 converter with B height pins
mounted horizontally with Vin = 24V, air flowing from pin 3 to
pin 1 and maximum FET temperature ≤ 120°C.
Ambient Temperature [°C]
20 30 40 50 60 70 80 90
Load Current [Adc]
0
5
10
15
20
500 LFM (2.5 m/s)
400 LFM (2.0 m/s)
300 LFM (1.5 m/s)
200 LFM (1.0 m/s)
100 LFM (0.5 m/s)
30 LFM (0.15 m/s)
Fig. 1.8V.4: Available load current vs. ambient temperature
and airflow rates for SQ24S15018 converter mounted horizon-
tally with Vin = 24V, air flowing from pin 3 to pin 1 and maxi-
mum FET temperature ≤ 120°C.
SQ24 Series Data Sheet
SQ24 Family DS Ver 5 05-14-04 USA Toll Free 866 WOW-didt Page 47 of 70
SQ24T/S15018 (1.8 Volts Out)
Load Current [Adc]
0246810121416
Efficiency
0.65
0.70
0.75
0.80
0.85
0.90
0.95
36 V
24 V
18 V
Fig. 1.8V.5: Efficiency vs. load current and input voltage for
SQ24T/S15018 converter mounted vertically with air flowing
from pin 3 to pin 1 at a rate of 300 LFM (1.5 m/s) and Ta =
25°C.
Load Current [Adc]
0246810121416
Power Dissipation [W]
0.00
1.00
2.00
3.00
4.00
5.00
6.00
36 V
24 V
18 V
Fig. 1.8V.7: Power dissipation vs. load current and input volt-
age for SQ24T/S15018 converter mounted vertically with air
flowing from pin 3 to pin 1 at a rate of 300 LFM (1.5 m/s) and
Ta = 25°C.
Load Current [Adc]
0246810121416
Efficiency
0.65
0.70
0.75
0.80
0.85
0.90
0.95
70 C
55 C
40 C
Fig. 1.8V.6: Efficiency vs. load current and ambient tempera-
ture for SQ24T/S15018 converter mounted vertically with
Vin = 24V and air flowing from pin 3 to pin 1 at a rate of 200
LFM (1.0 m/s).
Load Current [Adc]
0246810121416
Power Dissipation [W]
0.00
1.00
2.00
3.00
4.00
5.00
6.00
70 C
55 C
40 C
Fig. 1.8V.8: Power dissipation vs. load current and ambient
temperature for SQ24T/S15018 converter mounted vertically
with Vin = 24V and air flowing from pin 3 to pin 1 at a rate of
200 LFM (1.0 m/s).
SQ24 Series Data Sheet
SQ24 Family DS Ver 5 05-14-04 USA Toll Free 866 WOW-didt Page 48 of 70
SQ24T/S15018 (1.8 Volts Out)
Fig. 1.8V.9: Turn-on transient at full rated load current (resis-
tive) with no output capacitor at Vin = 24V, triggered via
ON/OFF pin. Top trace: ON/OFF signal (5 V/div.). Bottom
trace: output voltage (1 V/div.). Time scale: 1 ms/div.
Fig. 1.8V.11: Output voltage response to load current step-
change (3.75A – 7.5A – 3.75A) at Vin = 24V. Top trace: output
voltage (100 mV/div.). Bottom trace: load current (5 A/div.).
Current slew rate: 0.1 A/µs. Co = 1 µF ceramic. Time scale:
0.2 ms/div.
Fig. 1.8V.10: Turn-on transient at full rated load current (resis-
tive) plus 10,000µF at Vin = 24V, triggered via ON/OFF pin.
Top trace: ON/OFF signal (5 V/div.). Bottom trace: output volt-
age (1 V/div.). Time scale: 1 ms/div.
Fig. 1.8V.12: Output voltage response to load current step-
change (3.75A – 7.5A – 3.75A) at Vin = 24V. Top trace: output
voltage (100 mV/div.). Bottom trace: load current (5 A/div.).
Current slew rate: 5 A/µs. Co = 450 µF tantalum + 1 µF ce-
ramic. Time scale: 0.2 ms/div.
SQ24 Series Data Sheet
SQ24 Family DS Ver 5 05-14-04 USA Toll Free 866 WOW-didt Page 49 of 70
SQ24T/S15018 (1.8 Volts Out)
Fig. 1.8V.13: Output voltage ripple (20 mV/div.) at full rated
load current into a resistive load with Co = 10 µF tantalum +
1uF ceramic and Vin = 24V. Time scale: 1 µs/div.
Fig. 1.8V.15: Input reflected ripple current, ic (100 mA/div.),
measured at input terminals at full rated load current and Vin =
24V. Refer to Fig. 1.8V.14 for test setup. Time scale: 1 µs/div.
Vout
Vsource
i
S
i
C
1 µF
ceramic
capacitor
10 µH
source
inductance
Semi
Q
TM
Family
DC/DC
Converter
33 µF
ESR <1
electrolytic
capacitor
Ω
Fig. 1.8V.14: Test Set-up for measuring input reflected ripple
currents, ic and is.
Fig. 1.8V.16: Input reflected ripple current, is (10 mA/div.),
measured through 10 µH at the source at full rated load current
and Vin = 24V. Refer to Fig. 1.8V.14 for test setup. Time scale:
1µs/div.
SQ24 Series Data Sheet
SQ24 Family DS Ver 5 05-14-04 USA Toll Free 866 WOW-didt Page 50 of 70
SQ24T/S15018 (1.8 Volts Out)
520
3
Iout [Adc]
Vout [Vdc]
0
0
1
10 15
2
Fig. 1.8V.17: Output voltage vs. load current showing current
limit point and converter shutdown point. Input voltage has al-
most no effect on current limit characteristic.
Fig. 1.8V.18: Load current (top trace, 20 A/div., 20 ms/div.)
into a 10 mΩ short circuit during restart, at Vin = 24V. Bottom
trace (20 A/div., 2 ms/div.) is an expansion of the on-time por-
tion of the top trace.
SQ24 Series Data Sheet
SQ24 Family DS Ver 5 05-14-04 USA Toll Free 866 WOW-didt Page 51 of 70
Electrical Specifications: SQ24T/S15015 (1.5 Volts Out)
Conditions: TA=25ºC, Airflow=300 LFM (1.5 m/s), Vin=24Vdc, Vout=1.5 Vdc unless otherwise specified.
PARAMETER NOTES MIN TYP MAX UNITS
INPUT CHARACTERISTICS
Maximum Input Current 15 Adc, 1.5 Vdc Out @ 18 Vdc In 1.6 Adc
Input Stand-by Current Vin = 24V, converter disabled 2.6 mAdc
Input No Load Current (0 load on the output) Vin = 24V, converter enabled 48 mAdc
Input Reflected-Ripple Current 25MHz bandwidth 6 mAPK-PK
Input Voltage Ripple Rejection 120Hz TBD dB
OUTPUT CHARACTERISTICS
Output Voltage Set Point (no load) 1.485 1.500 1.515 Vdc
Output Regulation
Over Line ±2 ±4 mV
Over Load ±2 ±4 mV
Output Voltage Range Over line, load and temperature2 1.477 1.523 Vdc
Output Ripple and Noise - 25MHz bandwidth Full load + 10 µF tantalum + 1 µF ceramic 30 50 mVPK-PK
External Load Capacitance Plus full load (resistive) 15,000 µF
Output Current Range 0 15 Adc
Current Limit Inception Non-latching 18 20 Adc
Peak Short-Circuit Current Non-latching. Short=10m. 30 40 A
RMS Short-Circuit Current Non-latching 5.3 Arms
DYNAMIC RESPONSE
Load Change 25% of Iout Max, di/dt = 0.1 A/µS Co = 1 µF ceramic 80 mV
di/dt = 5 A/µS Co = 450 µF tant. + 1 µF ceramic 120 mV
Setting Time to 1% 170 µs
EFFICIENCY
100% Load 83 %
50% Load 83 %
Additional Notes: 2. -40ºC to 85ºC
SQ24 Series Data Sheet
SQ24 Family DS Ver 5 05-14-04 USA Toll Free 866 WOW-didt Page 52 of 70
SQ24T/S15015 (1.5 Volts Out)
Ambient Temperature [°C]
20 30 40 50 60 70 80 90
Load Current [Adc]
0
5
10
15
20
500 LFM (2.5 m/s)
400 LFM (2.0 m/s)
300 LFM (1.5 m/s)
200 LFM (1.0 m/s)
100 LFM (0.5 m/s)
30 LFM (0.15 m/s)
Fig. 1.5V.1: Available load current vs. ambient air temperature
and airflow rates for SQ24T15015 converter with B height pins
mounted vertically with Vin = 24V, air flowing from pin 3 to pin
1 and maximum FET temperature ≤ 120°C.
Ambient Temperature [°C]
20 30 40 50 60 70 80 90
Load Current [Adc]
0
5
10
15
20
500 LFM (2.5 m/s)
400 LFM (2.0 m/s)
300 LFM (1.5 m/s)
200 LFM (1.0 m/s)
100 LFM (0.5 m/s)
30 LFM (0.15 m/s)
Fig. 1.5V.3: Available load current vs. ambient temperature
and airflow rates for SQ24S15015 converter mounted vertically
with Vin = 24V, air flowing from pin 3 to pin 1 and maximum
FET temperature ≤ 120°C.
Ambient Temperature [°C]
20 30 40 50 60 70 80 90
Load Current [Adc]
0
5
10
15
20
500 LFM (2.5 m/s)
400 LFM (2.0 m/s)
300 LFM (1.5 m/s)
200 LFM (1.0 m/s)
100 LFM (0.5 m/s)
30 LFM (0.15 m/s)
Fig. 1.5V.2: Available load current vs. ambient air temperature
and airflow rates for SQ24T15015 converter with B height pins
mounted horizontally with Vin = 24V, air flowing from pin 3 to
pin 1 and maximum FET temperature ≤ 120°C.
Ambient Temperature [°C]
20 30 40 50 60 70 80 90
Load Current [Adc]
0
5
10
15
20
500 LFM (2.5 m/s)
400 LFM (2.0 m/s)
300 LFM (1.5 m/s)
200 LFM (1.0 m/s)
100 LFM (0.5 m/s)
30 LFM (0.15 m/s)
Fig. 1.5V.4: Available load current vs. ambient temperature
and airflow rates for SQ24S15015 converter mounted horizon-
tally with Vin = 24V, air flowing from pin 3 to pin 1 and maxi-
mum FET temperature ≤ 120°C.
SQ24 Series Data Sheet
SQ24 Family DS Ver 5 05-14-04 USA Toll Free 866 WOW-didt Page 53 of 70
SQ24T/S15015 (1.5 Volts Out)
Load Current [Adc]
0246810121416
Efficiency
0.65
0.70
0.75
0.80
0.85
0.90
0.95
36 V
24 V
18 V
Fig. 1.5V.5: Efficiency vs. load current and input voltage for
SQ24T/S15015 converter mounted vertically with air flowing
from pin 3 to pin 1 at a rate of 300 LFM (1.5 m/s) and Ta =
25°C.
Load Current [Adc]
0246810121416
Power Dissipation [W]
0.00
1.00
2.00
3.00
4.00
5.00
6.00
36 V
24 V
18 V
Fig. 1.5V.7: Power dissipation vs. load current and input volt-
age for SQ24T/S15015 converter mounted vertically with air
flowing from pin 3 to pin 1 at a rate of 300 LFM (1.5 m/s) and
Ta = 25°C.
Load Current [Adc]
0246810121416
Efficiency
0.65
0.70
0.75
0.80
0.85
0.90
0.95
70 C
55 C
40 C
Fig. 1.5V.6: Efficiency vs. load current and ambient tempera-
ture for SQ24T/S15015 converter mounted vertically with
Vin = 24V and air flowing from pin 3 to pin 1 at a rate of 200
LFM (1.0 m/s).
Load Current [Adc]
0246810121416
Power Dissipation [W]
0.00
1.00
2.00
3.00
4.00
5.00
6.00
70 C
55 C
40 C
Fig. 1.5V.8: Power dissipation vs. load current and ambient
temperature for SQ24T/S15015 converter mounted vertically
with Vin = 24V and air flowing from pin 3 to pin 1 at a rate of
200 LFM (1.0 m/s).
SQ24 Series Data Sheet
SQ24 Family DS Ver 5 05-14-04 USA Toll Free 866 WOW-didt Page 54 of 70
SQ24T/S15015 (1.5 Volts Out)
Fig. 1.5V.9: Turn-on transient at full rated load current (resis-
tive) with no output capacitor at Vin = 24V, triggered via
ON/OFF pin. Top trace: ON/OFF signal (5 V/div.). Bottom
trace: output voltage (0.5 V/div.). Time scale: 1 ms/div.
Fig. 1.5V.11: Output voltage response to load current step-
change (3.75 A – 7.5 A – 3.75 A) at Vin = 24V. Top trace: out-
put voltage (100 mV/div.). Bottom trace: load current (5 A/div.).
Current slew rate: 0.1 A/µs. Co = 1 µF ceramic. Time scale:
0.2 ms/div.
Fig. 1.5V.10: Turn-on transient at full rated load current (resis-
tive) plus 10,000 µF at Vin = 24V, triggered via ON/OFF pin.
Top trace: ON/OFF signal (5 V/div.). Bottom trace: output volt-
age (0.5 V/div.). Time scale: 1 ms/div.
Fig. 1.5V.12: Output voltage response to load current step-
change (3.75 A – 7.5 A – 3.75 A) at Vin = 24V. Top trace: out-
put voltage (100 mV/div.). Bottom trace: load current (5 A/div.).
Current slew rate: 5 A/µs. Co = 450 µF tantalum + 1 µF ce-
ramic. Time scale: 0.2 ms/div.
SQ24 Series Data Sheet
SQ24 Family DS Ver 5 05-14-04 USA Toll Free 866 WOW-didt Page 55 of 70
SQ24T/S15015 (1.5 Volts Out)
Fig. 1.5V.13: Output voltage ripple (20 mV/div.) at full rated
load current into a resistive load with Co = 10 µF tantalum +
1uF ceramic and Vin = 24V. Time scale: 1 µs/div.
Fig. 1.5V.15: Input reflected ripple current, ic (100 mA/div.),
measured at input terminals at full rated load current and Vin =
24V. Refer to Fig. 1.5V.14 for test setup. Time scale: 1 µs/div.
Vout
Vsource
i
S
i
C
1 µF
ceramic
capacitor
10 µH
source
inductance
Semi
Q
TM
Family
DC/DC
Converter
33 µF
ESR <1
electrolytic
capacitor
Ω
Fig. 1.5V.14: Test Set-up for measuring input reflected ripple
currents, ic and is.
Fig. 1.5V.16: Input reflected ripple current, is (10 mA/div.),
measured through 10 µH at the source at full rated load current
and Vin = 24V. Refer to Fig. 1.5V.14 for test setup. Time scale:
1µs/div.
SQ24 Series Data Sheet
SQ24 Family DS Ver 5 05-14-04 USA Toll Free 866 WOW-didt Page 56 of 70
SQ24T/S15015 (1.5 Volts Out)
520
2.0
Iout [Adc]
Vout [Vdc]
0
0
1.5
1.0
0.5
10 15
Fig. 1.5V.17: Output voltage vs. load current showing current
limit point and converter shutdown point. Input voltage has al-
most no effect on current limit characteristic.
Fig. 1.5V.18: Load current (top trace, 20 A/div., 20 ms/div.)
into a 10 mΩ short circuit during restart, at Vin = 24V. Bottom
trace (20 A/div., 2 ms/div.) is an expansion of the on-time por-
tion of the top trace.
SQ24 Series Data Sheet
SQ24 Family DS Ver 5 05-14-04 USA Toll Free 866 WOW-didt Page 57 of 70
Electrical Specifications: SQ24T/S15012 (1.2 Volts Out)
Conditions: TA=25ºC, Airflow=300 LFM (1.5 m/s), Vin=24Vdc, Vout=1.2 Vdc unless otherwise specified.
PARAMETER NOTES MIN TYP MAX UNITS
INPUT CHARACTERISTICS
Maximum Input Current 15 Adc, 1.2 Vdc Out @ 18 Vdc In 1.25 Adc
Input Stand-by Current Vin = 24V, converter disabled 2.6 mAdc
Input No Load Current (0 load on the output) Vin = 24V, converter enabled 43 mAdc
Input Reflected-Ripple Current 25MHz bandwidth 6 mAPK-PK
Input Voltage Ripple Rejection 120Hz TBD dB
OUTPUT CHARACTERISTICS
Output Voltage Set Point (no load) 1.188 1.200 1.212 Vdc
Output Regulation
Over Line ±1 ±3 mV
Over Load ±1 ±3 mV
Output Voltage Range Over line, load and temperature2 1.182 1.218 Vdc
Output Ripple and Noise - 25MHz bandwidth Full load + 10 µF tantalum + 1 µF ceramic 30 50 mVPK-PK
External Load Capacitance Plus full load (resistive) 15,000 µF
Output Current Range 0 15 Adc
Current Limit Inception Non-latching 18 20 Adc
Peak Short-Circuit Current Non-latching. Short=10m. 30 40 A
RMS Short-Circuit Current Non-latching 5.3 Arms
DYNAMIC RESPONSE
Load Change 25% of Iout Max, di/dt = 0.1 A/µS Co = 1 µF ceramic 90 mV
di/dt = 5 A/µS Co = 450 µF tant. + 1 µF ceramic 120 mV
Setting Time to 1% 200 µs
EFFICIENCY
100% Load 81 %
50% Load 81 %
Additional Notes: 2. -40ºC to 85ºC
SQ24 Series Data Sheet
SQ24 Family DS Ver 5 05-14-04 USA Toll Free 866 WOW-didt Page 58 of 70
SQ24T/S15012 (1.2 Volts Out)
Ambient Temperature [°C]
20 30 40 50 60 70 80 90
Load Current [Adc]
0
5
10
15
20
500 LFM (2.5 m/s)
400 LFM (2.0 m/s)
300 LFM (1.5 m/s)
200 LFM (1.0 m/s)
100 LFM (0.5 m/s)
30 LFM (0.15 m/s)
Fig. 1.2V.1: Available load current vs. ambient air temperature
and airflow rates for SQ24T15012 converter with B height pins
mounted vertically with Vin = 24V, air flowing from pin 3 to pin
1 and maximum FET temperature ≤ 120°C.
Ambient Temperature [°C]
20 30 40 50 60 70 80 90
Load Current [Adc]
0
5
10
15
20
500 LFM (2.5 m/s)
400 LFM (2.0 m/s)
300 LFM (1.5 m/s)
200 LFM (1.0 m/s)
100 LFM (0.5 m/s)
30 LFM (0.15 m/s)
Fig. 1.2V.3: Available load current vs. ambient temperature
and airflow rates for SQ24S15012 converter mounted vertically
with Vin = 24V, air flowing from pin 3 to pin 1 and maximum
FET temperature ≤ 120°C.
Ambient Temperature [°C]
20 30 40 50 60 70 80 90
Load Current [Adc]
0
5
10
15
20
500 LFM (2.5 m/s)
400 LFM (2.0 m/s)
300 LFM (1.5 m/s)
200 LFM (1.0 m/s)
100 LFM (0.5 m/s)
30 LFM (0.15 m/s)
Fig. 1.2V.2: Available load current vs. ambient air temperature
and airflow rates for SQ24T15012 converter with B height pins
mounted horizontally with Vin = 24V, air flowing from pin 3 to
pin 1 and maximum FET temperature ≤ 120°C.
Ambient Temperature [°C]
20 30 40 50 60 70 80 90
Load Current [Adc]
0
5
10
15
20
500 LFM (2.5 m/s)
400 LFM (2.0 m/s)
300 LFM (1.5 m/s)
200 LFM (1.0 m/s)
100 LFM (0.5 m/s)
30 LFM (0.15 m/s)
Fig. 1.2V.4: Available load current vs. ambient temperature
and airflow rates for SQ24S15012 converter mounted horizon-
tally with Vin = 24V, air flowing from pin 3 to pin 1 and maxi-
mum FET temperature ≤ 120°C.
SQ24 Series Data Sheet
SQ24 Family DS Ver 5 05-14-04 USA Toll Free 866 WOW-didt Page 59 of 70
SQ24T/S15012 (1.2 Volts Out)
Load Current [Adc]
0246810121416
Efficiency
0.65
0.70
0.75
0.80
0.85
0.90
0.95
36 V
24 V
18 V
Fig. 1.2V.5: Efficiency vs. load current and input voltage for
SQ24T/S15012 converter mounted vertically with air flowing
from pin 3 to pin 1 at a rate of 300 LFM (1.5 m/s) and Ta =
25°C.
Load Current [Adc]
0246810121416
Power Dissipation [W]
0.00
1.00
2.00
3.00
4.00
5.00
6.00
36 V
24 V
18 V
Fig. 1.2V.7: Power dissipation vs. load current and input volt-
age for SQ24T/S15012 converter mounted vertically with air
flowing from pin 3 to pin 1 at a rate of 300 LFM (1.5 m/s) and
Ta = 25°C.
Load Current [Adc]
0246810121416
Efficiency
0.65
0.70
0.75
0.80
0.85
0.90
0.95
70 C
55 C
40 C
Fig. 1.2V.6: Efficiency vs. load current and ambient tempera-
ture for SQ24T/S15012 converter mounted vertically with
Vin = 24V and air flowing from pin 3 to pin 1 at a rate of 200
LFM (1.0 m/s).
Load Current [Adc]
0246810121416
Power Dissipation [W]
0.00
1.00
2.00
3.00
4.00
5.00
6.00
70 C
55 C
40 C
Fig. 1.2V.8: Power dissipation vs. load current and ambient
temperature for SQ24T/S15012 converter mounted vertically
with Vin = 24V and air flowing from pin 3 to pin 1 at a rate of
200 LFM (1.0 m/s).
SQ24 Series Data Sheet
SQ24 Family DS Ver 5 05-14-04 USA Toll Free 866 WOW-didt Page 60 of 70
SQ24T/S15012 (1.2 Volts Out)
Fig. 1.2V.9: Turn-on transient at full rated load current (resis-
tive) with no output capacitor at Vin = 24V, triggered via
ON/OFF pin. Top trace: ON/OFF signal (5 V/div.). Bottom
trace: output voltage (0.5 V/div.). Time scale: 1 ms/div.
Fig. 1.2V.11: Output voltage response to load current step-
change (3.75 A – 7.5 A – 3.75 A) at Vin = 24V. Top trace: out-
put voltage (100 mV/div.). Bottom trace: load current (5 A/div.).
Current slew rate: 0.1 A/µs. Co = 1 µF ceramic. Time scale:
0.2 ms/div.
Fig. 1.2V.10: Turn-on transient at full rated load current (resis-
tive) plus 10,000 µF at Vin = 24V, triggered via ON/OFF pin.
Top trace: ON/OFF signal (5 V/div.). Bottom trace: output volt-
age (0.5 V/div.). Time scale: 1 ms/div.
Fig. 1.2V.12: Output voltage response to load current step-
change (3.75 A – 7.5 A – 3.75 A) at Vin = 24V. Top trace: out-
put voltage (100 mV/div.). Bottom trace: load current (5 A/div.).
Current slew rate: 5 A/µs. Co = 450 µF tantalum + 1 µF ce-
ramic. Time scale: 0.2 ms/div.
SQ24 Series Data Sheet
SQ24 Family DS Ver 5 05-14-04 USA Toll Free 866 WOW-didt Page 61 of 70
SQ24T/S15012 (1.2 Volts Out)
Fig. 1.2V.13: Output voltage ripple (20 mV/div.) at full rated
load current into a resistive load with Co = 10 µF tantalum +
1uF ceramic and Vin = 24V. Time scale: 1 µs/div.
Fig. 1.2V.15: Input reflected ripple current, ic (100 mA/div.),
measured at input terminals at full rated load current and Vin =
24V. Refer to Fig. 1.2V.14 for test setup. Time scale: 1 µs/div.
Vout
Vsource
i
S
i
C
1 µF
ceramic
capacitor
10 µH
source
inductance
Semi
Q
TM
Family
DC/DC
Converter
33 µF
ESR <1
electrolytic
capacitor
Ω
Fig. 1.2V.14: Test Set-up for measuring input reflected ripple
currents, ic and is.
Fig. 1.2V.16: Input reflected ripple current, is (10 mA/div.),
measured through 10 µH at the source at full rated load current
and Vin = 24V. Refer to Fig. 1.2V.14 for test setup. Time scale:
1µs/div.
SQ24 Series Data Sheet
SQ24 Family DS Ver 5 05-14-04 USA Toll Free 866 WOW-didt Page 62 of 70
SQ24T/S15012 (1.2 Volts Out)
520
Iout [Adc]
Vout [Vdc]
0
0
10 15
1.5
1.0
0.5
Fig. 1.2V.17: Output voltage vs. load current showing current
limit point and converter shutdown point. Input voltage has al-
most no effect on current limit characteristic.
Fig. 1.2V.18: Load current (top trace, 20 A/div., 20 ms/div.)
into a 10 mΩ short circuit during restart, at Vin = 24V. Bottom
trace (20 A/div., 2 ms/div.) is an expansion of the on-time por-
tion of the top trace.
SQ24 Series Data Sheet
SQ24 Family DS Ver 5 05-14-04 USA Toll Free 866 WOW-didt Page 63 of 70
Electrical Specifications: SQ24T/S15010 (1.0 Volt Out)
Conditions: TA=25ºC, Airflow=300 LFM (1.5 m/s), Vin=24Vdc, Vout=1.0 Vdc unless otherwise specified.
PARAMETER NOTES MIN TYP MAX UNITS
INPUT CHARACTERISTICS
Maximum Input Current 15 Adc, 1.0 Vdc Out @ 18 Vdc In 1.1 Adc
Input Stand-by Current Vin = 24V, converter disabled 2.6 mAdc
Input No Load Current (0 load on the output) Vin = 24V, converter enabled 43 mAdc
Input Reflected-Ripple Current 25MHz bandwidth 7.5 mAPK-PK
Input Voltage Ripple Rejection 120Hz TBD dB
OUTPUT CHARACTERISTICS
Output Voltage Set Point (no load) 0.990 1.000 1.010 Vdc
Output Regulation
Over Line ±1 ±2 mV
Over Load ±1 ±3 mV
Output Voltage Range Over line, load and temperature2 0.985 1.015 Vdc
Output Ripple and Noise - 25MHz bandwidth Full load + 10 µF tantalum + 1 µF ceramic 30 50 mVPK-PK
External Load Capacitance Plus full load (resistive) 15,000 µF
Output Current Range 0 15 Adc
Current Limit Inception Non-latching 18 20 Adc
Peak Short-Circuit Current Non-latching. Short=10m. 30 40 A
RMS Short-Circuit Current Non-latching 5.3 Arms
DYNAMIC RESPONSE
Load Change 25% of Iout Max, di/dt = 0.1 A/µS Co = 1 µF ceramic 80 mV
di/dt = 5 A/µS Co = 450 µF tant. + 1 µF ceramic 140 mV
Setting Time to 1% 180 µs
EFFICIENCY
100% Load 79 %
50% Load 79 %
Additional Notes: 2. -40ºC to 85ºC
SQ24 Series Data Sheet
SQ24 Family DS Ver 5 05-14-04 USA Toll Free 866 WOW-didt Page 64 of 70
SQ24T/S15010 (1.0 Volt Out)
Ambient Temperature [°C]
20 30 40 50 60 70 80 90
Load Current [Adc]
0
5
10
15
20
500 LFM (2.5 m/s)
400 LFM (2.0 m/s)
300 LFM (1.5 m/s)
200 LFM (1.0 m/s)
100 LFM (0.5 m/s)
30 LFM (0.15 m/s)
Fig. 1.0V.1: Available load current vs. ambient air temperature
and airflow rates for SQ24T15010 converter with B height pins
mounted vertically with Vin = 24V, air flowing from pin 3 to pin
1 and maximum FET temperature ≤ 120°C.
Ambient Temperature [°C]
20 30 40 50 60 70 80 90
Load Current [Adc]
0
5
10
15
20
500 LFM (2.5 m/s)
400 LFM (2.0 m/s)
300 LFM (1.5 m/s)
200 LFM (1.0 m/s)
100 LFM (0.5 m/s)
30 LFM (0.15 m/s)
Fig. 1.0V.3: Available load current vs. ambient temperature
and airflow rates for SQ24S15010 converter mounted vertically
with Vin = 24V, air flowing from pin 3 to pin 1 and maximum
FET temperature ≤ 120°C.
Ambient Temperature [°C]
20 30 40 50 60 70 80 90
Load Current [Adc]
0
5
10
15
20
500 LFM (2.5 m/s)
400 LFM (2.0 m/s)
300 LFM (1.5 m/s)
200 LFM (1.0 m/s)
100 LFM (0.5 m/s)
30 LFM (0.15 m/s)
Fig. 1.0V.2: Available load current vs. ambient air temperature
and airflow rates for SQ24T15010 converter with B height pins
mounted horizontally with Vin = 24V, air flowing from pin 3 to
pin 1 and maximum FET temperature ≤ 120°C.
Ambient Temperature [°C]
20 30 40 50 60 70 80 90
Load Current [Adc]
0
5
10
15
20
500 LFM (2.5 m/s)
400 LFM (2.0 m/s)
300 LFM (1.5 m/s)
200 LFM (1.0 m/s)
100 LFM (0.5 m/s)
30 LFM (0.15 m/s)
Fig. 1.0V.4: Available load current vs. ambient temperature
and airflow rates for SQ24S15010 converter mounted horizon-
tally with Vin = 24V, air flowing from pin 3 to pin 1 and maxi-
mum FET temperature ≤ 120°C.
SQ24 Series Data Sheet
SQ24 Family DS Ver 5 05-14-04 USA Toll Free 866 WOW-didt Page 65 of 70
SQ24T/S15010 (1.0 Volt Out)
Load Current [Adc]
0246810121416
Efficiency
0.65
0.70
0.75
0.80
0.85
0.90
0.95
36 V
24 V
18 V
Fig. 1.0V.5: Efficiency vs. load current and input voltage for
SQ24T/S15010 converter mounted vertically with air flowing
from pin 3 to pin 1 at a rate of 300 LFM (1.5 m/s) and Ta =
25°C.
Load Current [Adc]
0246810121416
Power Dissipation [W]
0.00
1.00
2.00
3.00
4.00
5.00
6.00
36 V
24 V
18 V
Fig. 1.0V.7: Power dissipation vs. load current and input volt-
age for SQ24T/S15010 converter mounted vertically with air
flowing from pin 3 to pin 1 at a rate of 300 LFM (1.5 m/s) and
Ta = 25°C.
Load Current [Adc]
0246810121416
Efficiency
0.65
0.70
0.75
0.80
0.85
0.90
0.95
70 C
55 C
40 C
Fig. 1.0V.6: Efficiency vs. load current and ambient tempera-
ture for SQ24T/S15010 converter mounted vertically with
Vin = 24V and air flowing from pin 3 to pin 1 at a rate of 200
LFM (1.0 m/s).
Load Current [Adc]
0246810121416
Power Dissipation [W]
0.00
1.00
2.00
3.00
4.00
5.00
6.00
70 C
55 C
40 C
Fig. 1.0V.8: Power dissipation vs. load current and ambient
temperature for SQ24T/S15010 converter mounted vertically
with Vin = 24V and air flowing from pin 3 to pin 1 at a rate of
200 LFM (1.0 m/s).
SQ24 Series Data Sheet
SQ24 Family DS Ver 5 05-14-04 USA Toll Free 866 WOW-didt Page 66 of 70
SQ24T/S15010 (1.0 Volt Out)
Fig. 1.0V.9: Turn-on transient at full rated load current (resis-
tive) with no output capacitor at Vin = 24V, triggered via
ON/OFF pin. Top trace: ON/OFF signal (5 V/div.). Bottom
trace: output voltage (0.5 V/div.). Time scale: 1 ms/div.
Fig. 1.0V.11: Output voltage response to load current step-
change (3.75 A – 7.5 A – 3.75 A) at Vin = 24V. Top trace: out-
put voltage (100 mV/div.). Bottom trace: load current (5 A/div.).
Current slew rate: 0.1 A/µs. Co = 1 µF ceramic. Time scale:
0.2 ms/div.
Fig. 1.0V.10: Turn-on transient at full rated load current (resis-
tive) plus 10,000µF at Vin = 24V, triggered via ON/OFF pin.
Top trace: ON/OFF signal (5 V/div.). Bottom trace: output volt-
age (0.5 V/div.). Time scale: 1 ms/div.
Fig. 1.0V.12: Output voltage response to load current step-
change (3.75 A – 7.5 A – 3.75 A) at Vin = 24V. Top trace: out-
put voltage (100 mV/div.). Bottom trace: load current (5 A/div.).
Current slew rate: 5 A/µs. Co = 450 µF tantalum + 1 µF ce-
ramic. Time scale: 0.2 ms/div.
SQ24 Series Data Sheet
SQ24 Family DS Ver 5 05-14-04 USA Toll Free 866 WOW-didt Page 67 of 70
SQ24T/S15010 (1.0 Volt Out)
Fig. 1.0V.13: Output voltage ripple (20 mV/div.) at full rated
load current into a resistive load with Co = 10 µF tantalum +
1uF ceramic and Vin = 24V. Time scale: 1 µs/div.
Fig. 1.0V.15: Input reflected ripple current, ic (100 mA/div.),
measured at input terminals at full rated load current and Vin =
24V. Refer to Fig. 1.0V.14 for test setup. Time scale: 1 µs/div.
Vout
Vsource
i
S
i
C
1 µF
ceramic
capacitor
10 µH
source
inductance
Semi
Q
TM
Family
DC/DC
Converter
33 µF
ESR <1
electrolytic
capacitor
Ω
Fig. 1.0V.14: Test Set-up for measuring input reflected ripple
currents, ic and is.
Fig. 1.0V.16: Input reflected ripple current, is (10 mA/div.),
measured through 10 µH at the source at full rated load current
and Vin = 24V. Refer to Fig. 1.0V.14 for test setup. Time scale:
1µs/div.
SQ24 Series Data Sheet
SQ24 Family DS Ver 5 05-14-04 USA Toll Free 866 WOW-didt Page 68 of 70
SQ24T/S15010 (1.0 Volt Out)
520
Iout [Adc]
Vout [Vdc]
0
0
10 15
1.5
1.0
0.5
Fig. 1.0V.17: Output voltage vs. load current showing current
limit point and converter shutdown point. Input voltage has al-
most no effect on current limit characteristic.
Fig. 1.0V.18: Load current (top trace, 20 A/div., 20 ms/div.)
into a 10 mΩ short circuit during restart, at Vin = 24V. Bottom
trace (20 A/div., 2 ms/div.) is an expansion of the on-time por-
tion of the top trace.
SQ24 Series Data Sheet
SQ24 Family DS Ver 5 05-14-04 USA Toll Free 866 WOW-didt Page 69 of 70
Physical Information
TOP VIEW
1
2
3
7
8
6
5
4
SIDE VIEW
SQ24S Pinout (Surface Mount)
TOP VIEW
1
2
3
7
8
6
5
4
SIDE VIEW
SQ24T Pinout (Through-hole)
Pad/Pin Connections
Pad/Pin # Function
1 Vin (+)
2 ON/OFF
3 Vin (-)
4 Vout (-)
5 SENSE(-)
6 TRIM
7 SENSE(+)
8 Vout (+)
HT
(Max. Height)
CL
(Min. Clearance)
Height
Option +0.000 [+0.00]
-0.038 [- 0.97]
+0.016 [+0.41]
-0.000 [- 0.00]
A 0.319 [8.10] 0.030 [0.77]
B 0.352 [8.94] 0.063 [1.60]
C 0.516 [13.11] 0.227 [5.77]
D 0.416 [10.57] 0.127 [3.23]
E 0.298 [7.57] 0.009 [0.23]
PL
Pin Length
Pin
Option ±0.005 [±0.13]
A 0.188 [4.77]
B 0.145 [3.68]
C 0.110 [2.79]
SQ24S Platform Notes
• All dimensions are in inches [mm]
• Connector Material: Copper
• Connector Finish: Gold over Nickel
Optional: Tin/Lead over Nickel
• Converter Weight: 0.53 oz [15 g]
• Recommended Surface-Mount Pads:
Min. 0.080” X 0.112” [2.03 x 2.84]
Max. 0.092” X 0.124” [2.34 x 3.15]
SQ24T Platform Notes
• All dimensions are in inches [mm]
• Pins 1-3 and 5-7 are Ø 0.040” [1.02]
with Ø 0.078” [1.98] shoulder
• Pins 4 and 8 are Ø 0.062” [1.57]
without shoulder
• Pin material: Brass
• Pin Finish: Tin/Lead over Nickel
• Converter Weight: 0.53 oz [15 g]
SQ24 Series Data Sheet
SQ24 Family DS Ver 5 05-14-04 USA Toll Free 866 WOW-didt Page 70 of 70
Converter Part Numbering Scheme
Product
Series
Input
Voltage
Mounting
Scheme
Rated Load
Current
Output
Voltage ON/OFF
Logic
Maximum
Height [HT]
Pin
Length [PL]
Special
Features
SQ 24 T 05 080 - N B A 0
One-Eighth
Brick
Format
18-36 V
S ⇒
Surface
Mount
T⇒
Through-
hole
15 ⇒ 15 A
(1.0 – 3.3 V)
10 ⇒ 10 A
(5.0 V)
08 ⇒ 8 A
(6.0 V)
05 ⇒ 5.3 A
(8.0 V)
04 ⇒ 4 A
(12.0 V)
010 ⇒ 1.0 V
012 ⇒ 1.2 V
015 ⇒ 1.5 V
018 ⇒ 1.8 V
020 ⇒ 2.0 V
025 ⇒ 2.5 V
033 ⇒ 3.3 V
050 ⇒ 5.0 V
060 ⇒ 6.0 V
080 ⇒ 8.0 V
120 ⇒ 12.0 V
N ⇒
Negative
P ⇒
Positive
SMT
S ⇒ 0.289”
Through hole
A ⇒ 0.319”
B ⇒ 0.352”
C ⇒ 0.516”
D ⇒ 0.416”
E ⇒ 0.298”
SMT
0 ⇒ 0.00”
Through hole
A ⇒ 0.188”
B ⇒ 0.145”
C ⇒ 0.110”
0 ⇒ STD
S ⇒ SMC
Tin/Lead
over Nickel
T ⇒
Special
Trim2
(For 1.2V &
1.0V only)
1. The example above describes P/N SQ24T05080-NBA0: 18-36 V input, through-hole mounting, 5.3 A @ 8.0 V output, negative ON/OFF logic,
a maximum height of 0.352”, and a through the board pin length of 0.188”. Please consult factory regarding availability of a specific version.
2. For definitions, operation, and associated trim equations for all trim options, please refer to Application Note 103, Trim Feature for Isolated
dc-dc converters.
For more information please contact
di/dt, a Power-One company
1822 Aston Avenue •• Carlsbad, CA •• 92008 •• USA
USA Toll Free 866-WOW-didt (969-3438)
www.didt.com •• support@didt.com
The information and specifications contained in this data sheet are believed to be accurate and reliable at the time of publication. However, Power-One, Inc. assumes no responsibility for its use
or for any infringements of patents or other rights of third parties, which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Power-One,
Inc. Specifications are subject to change without notice. ©Copyright Power-One, Inc. 2004
