MAX5087BATE/V+T - Maxim Integrated

General Description

The MAX5087 high-voltage linear regulator operates

from an input voltage of 6.5V to 45V and delivers up

to 400mA of output current. The device consumes only

70μA of quiescent current with no load and 11μA in

shutdown. The device includes a SET input, that when

connected to ground, selects a preset output voltage of

3.3V (MAX5087A) or 5.0V (MAX5087B). Alternatively, the

output voltage can be adjusted from 2.5V to 11V by simply

connecting SET to the regulator’s output through a resis-

tive divider network. The MAX5087 also provides an open-

drain, active-low microprocessor (μP) reset output that

asserts when the regulator output drops below the preset

output voltage threshold. An external capacitor programs

the reset timeout period. Other features include an enable

input, thermal shutdown, and short-circuit protection.

The MAX5087 operates over the automotive temperature

range of -40°C to +125°C and is available in a 16-pin

TQFN thermally enhanced package.

Applications

●Industrial

● Home Security/Safety

● Networking

Features

●Wide Operating Input Voltage Range (6.5V to 45V)

● Thermally Enhanced Package Dissipates

2.6W at TA = +70°C (16-Pin TQFN)

●Guaranteed 400mA Output Current

● 70μA Quiescent Supply Current

● Preset 3.3V, 5.0V, or Adjustable 2.5V to 11V Output

Voltage

● Remote Load Sense Capability

● Enable Input

● Integrated μP Reset Circuit with Programmable

Timeout Period

● Thermal and Short-Circuit Protection

● -40°C to +125°C Operating Temperature Range

19-3964; Rev 6; 5/14

Note: All devices are specified over the -40°C to +125°C oper-

ating temperature range.

*EP = Exposed paddle.

+Denotes lead-free package.

PART PIN-PACKAGE OUTPUT

VOLTAGE (V)

MAX5087AATE+ 16 TQFN-EP* 3.3

MAX5087BATE+ 16 TQFN-EP* 5.0

MAX5087BATE/V+ 16 TQFN-EP* 5.0

12 11 10 9

OUT

OUTSENSE

GND

TOP VIEW

N.C.

1 2 3 4

N.C.

MAX5087

N.C.

RESET

SET

TQFN

MAX5087 45V, 400mA, Low-Quiescent-Current

Linear Regulator with Adjustable Reset Delay

Ordering Information

Pin Conguration

EVALUATION KIT AVAILABLE

IN to GND (do not exceed package power

dissipation)............................

........

......................-0.3V to +50V

IN to GND (T ≤ 300ms, IOUT ≤ 250mA)..................-0.3V to +42V

EN to GND..............................................................-0.3V to +50V

RESET, OUT, OUTSENSE to GND.........................-0.3V to +12V

IN to OUT................................................................-0.3V to +50V

CT, SET TO GND....................................................-0.3V to +35V

Short-Circuit Duration (VIN ≤ 14V)..............................Continuous

Maximum Current into Any Pin (Except IN, OUT).............±20mA

Continuous Power Dissipation (TA = +70°C)

16-Pin TQFN (derate 33.3mW/°C above +70°C).......2666mW

Operating Temperature Range...........................-40°C to +125°C

Junction Temperature.......................................................+150°C

Storage Temperature Range..............................-60°C to +150°C

Lead Temperature (soldering, 10s)...................................+300°C

TQFN

Junction-to-Ambient Thermal Resistance (θJA)........30.0°C/W

Junction-to-Case Thermal Resistance (θJC)..................2°C/W

(Note 1)

(VIN = 14V, IOUT = 1mA, CIN = 47μF (low ESR), COUT = 15μF, VEN = 2.4V, 10kΩ from RESET to OUT, TA = TJ = -40°C to +125°C,

unless otherwise noted. Typical specifications are at TA = +25°C.) (Note 2)

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

Input Voltage Range VIN VIN ≥ VOUT + 1.5V 6.5 45.0 V

Supply Current IQMeasured at GND,

SET = GND

IOUT = 0 70 150 µA

IOUT = 400mA 5300

Shutdown Supply Current ISHDN VEN P 0.4V 11 21 µA

REGULATOR

Guaranteed Output Current IOUT VIN = 6.5V, VOUT = 5.0V 400 mA

Output Voltage (Note 3) VOUT

SET = GND,

5V version

6.5V P VIN ≤ 25V,

5mA P IOUT ≤ 400mA 4.87 5 5.13

6.5V P VIN ≤ 45V,

5mA P IOUT ≤ 100mA 4.850 5 5.150

SET = GND,

3.3V version

6.5V P VIN ≤ 25V,

5mA P IOUT ≤ 400mA 3.208 3.3 3.392

6.5V P VIN ≤ 45V,

5mA P IOUT ≤ 100mA 3.208 3.3 3.392

IOUT = 5mA, adjustable range 2.5 11.0

Dropout Voltage ΔVDO IOUT = 400mA, VOUT = 5V (Note 4) 0.9 2.2 V

Startup Response Time Rising edge of VIN to VOUT,

RL = 500Ω, SET = GND (Note 5) 400 µs

Line Regulation ΔVOUT /

ΔVIN 8V ≤ VIN ≤ 45V 5V version -1 +1 mV/V

3.3V version -0.5 +0.5

Enable Voltage VEN

VEN = high, regulator on 2.4 V

VEN = low, regulator off 0.4

MAX5087 45V, 400mA, Low-Quiescent-Current

Linear Regulator with Adjustable Reset Delay

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Note 1: Package thermal resistances were obtained using the method described in JEDEC specification JESD51-7, using a four-layer

board. For detailed information on package thermal considerations, refer to www.maximintegrated.com/thermal-tutorial.

Absolute Maximum Ratings

Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these

or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect

device reliability.

Package Thermal Characteristics

Electrical Characteristics

(VIN = 14V, IOUT = 1mA, CIN = 47μF (low ESR), COUT = 15μF, VEN = 2.4V, 10kΩ from RESET to OUT, TA = TJ = -40°C to +125°C,

unless otherwise noted. Typical specifications are at TA = +25°C.) (Note 2)

Note 2: Limits at TA = -40°C are guaranteed by design.

Note 3: Output voltage is tested using a pulsed load current of less than 50ms duration.

Note 4: Dropout voltage is defined as (VIN - VOUT) when VOUT is 100mV below the value of VOUT for VIN = VOUT + 3V.

Note 5: Startup time measured from 50% of VIN to 90% of VOUT.

Note 6: Continuous short-circuit protection for VIN > 14V not guaranteed.

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

Enable Input Current IEN

VEN = 2.4V 0.35 µA

VEN = 14V 3.4

SET Reference Voltage VSET 1.200 1.235 1.260 V

SET Input Leakage Current ISET -100 +0.5 +100 nA

Load Regulation ΔVOUT /

ΔIOUT

IOUT = 1mA to 400mA (Note 3) 0.1 0.35 Ω

Power-Supply Rejection Ratio PSRR IOUT = 10mA, f = 100Hz, 500mVP-P,

VOUT = 5V 70 dB

Short-Circuit Current ISC VIN < 14V (Note 6) 640 mA

Thermal Shutdown Temperature TJ(SHDN) 175 °C

Thermal Shutdown Hysteresis ΔTJ(SHDN) 25 °C

RESET Voltage Threshold VRESET 89 92 94 % VOUT

RESET Threshold Hysteresis VRHYST 2% VOUT

RESET Output Low Voltage VRL ISINK = 1mA 0.4 V

RESET Output Leakage Current IRH VRESET = 5V 1µA

RESET Output Minimum Timeout

Period

When VOUT reaches RESET threshold,

CCT = Open 15 µs

ENABLE to RESET Minimum

Timeout Period When EN goes high, CCT = open 170 µs

Delay Comparator Threshold

(Rising) 1.196 1.230 1.264 V

Delay Comparator Threshold

Hysteresis 100 mV

CT Charge Current 12 4 µA

CT Discharge Current 5 mA

MAX5087 45V, 400mA, Low-Quiescent-Current

Linear Regulator with Adjustable Reset Delay

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Electrical Characteristics (continued)

(VIN = VEN = 14V, CIN = 47μF (low ESR), COUT = 15μF, VOUT = 5V, SET = GND, TA = +25°C, unless otherwise specied.)

NO-LOAD SUPPLY CURRENT

vs. TEMPERATURE

MAX5087 toc02

TEMPERATURE (°C)

GND

(A)

11095-25 -10 5 35 50 6520 80

100

110

120

-40 125

VIN = +45V

VIN = +14V

VIN = +6.5V

SHUTDOWN SUPPLY CURRENT

vs. TEMPERATURE

MAX5087 toc03

TEMPERATURE (°C)

SHDN

(A)

12511080 95-10 5 20 35 50 65-25

-40 140

OUTPUT VOLTAGE

vs. TEMPERATURE

MAX5087 toc04

TEMPERATURE (°C)

VOUT (V)

12511080 95-10 5 20 35 50 65-25

4.80

4.85

4.90

4.95

5.00

5.05

5.10

5.15

5.20

5.25

4.75

-40 140

IOUT = 5mA

GROUND CURRENT

vs. TEMPERATURE (PULSED LOAD)

MAX5087 toc05

TEMPERATURE (°C)

GND

(mA)

1251109580655035205-10-25

-40 140

VIN = +6.5V

IOUT = 50mA IOUT = 100mA

IOUT = 400mA

OUTPUT VOLTAGE

vs. LOAD CURRENT AND TEMPERATURE

MAX5087 toc06

TEMPERATURE (°C)

OUT

(V)

12511080 95-10 5 20 35 50 65-25

4.80

4.85

4.90

4.95

5.00

5.05

5.10

5.15

5.20

5.25

4.75

-40 140

VIN = +6.5V

IOUT = 100mA

IOUT = 50mA

IOUT = 400mA

DROPOUT VOLTAGE

vs. LOAD CURRENT

MAX5087 toc07

OUT

(mA)

DROPOUT

(V)

350300200 25050 100 150

0.15

0.30

0.45

0.60

0.75

0.90

1.05

1.20

1.35

1.50

0 400

VOUT = +5V

OUTPUT VOLTAGE vs.

INPUT VOLTAGE

MAX5087 toc01

VIN (V)

VOUT (V)

4515 20 25 30 35 405 10

0.5

1.0

1.5

2.0

2.5

3.0

3.5

4.0

4.5

5.0

5.5

IOUT = 0

POWER-SUPPLY REJECTION RATIO

vs. FREQUENCY

MAX5087 toc08

FREQUENCY (kHz)

PSRR (dB)

100101

-70

-60

-50

-40

-30

-20

-10

-80

0.1 1000

COUT = 15F

IOUT = 10mA

LOAD-TRANSIENT RESPONSE

MAX5087 toc09

400s/div

VOUT

200mV/div

AC-COUPLED

IOUT

200mA/div

5mA

400mA

IOUT = 5mA

MAX5087 45V, 400mA, Low-Quiescent-Current

Linear Regulator with Adjustable Reset Delay

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Typical Operating Characteristics

(VIN = VEN = 14V, CIN = 47μF (low ESR), COUT = 15μF, VOUT = 5V, SET = GND, TA = +25°C, unless otherwise specied.)

INPUT VOLTAGE STEP RESPONSE

MAX5087 toc10

400s/div

VOUT

AC-COUPLED

500mV/div

26V

6.5V

VIN

10V/div

IOUT = 50mA

STARTUP RESPONSE

MAX5087 toc11

400s/div

VOUT

2V/div

VIN

10V/div

IOUT = 5mA

ENABLE STARTUP RESPONSE

MAX5087 toc12

100s/div

1V/div

VOUT

2V/div

VIN = 14V

IOUT = 0

ENABLE STARTUP RESPONSE

MAX5087 toc13

100s/div

1V/div

VOUT

2V/div

VIN = 14V

IOUT = 400mA

ENABLE STARTUP RESPONSE

MAX5087 toc14

100s/div

1V/div

VOUT

2V/div

VIN = 45V

IOUT = 0

ENABLE STARTUP RESPONSE

MAX5087 toc15

100s/div

1V/div

VOUT

2V/div

VIN = 45V

IOUT = 400mA

SHUTDOWN RESPONSE

MAX5087 toc16

20ms/div

1V/div

VOUT

2V/div

IOUT = 5mA

GROUND CURRENT DISTRIBUTION

(TA = -40°C)

MAX5087 toc17

GND

(A)

NUMBER OF UNITS

656454 55 56 57 58 60 61 6259 63

51 52 53

150 UNITS

TESTED

GROUND CURRENT DISTRIBUTION

(TA = +125°C)

MAX5087 toc18

GND

(A)

NUMBER OF UNITS

74 75 767363 65 66 68 69 7067 7271

150 UNITS

TESTED

MAX5087 45V, 400mA, Low-Quiescent-Current

Linear Regulator with Adjustable Reset Delay

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Typical Operating Characteristics (continued)

PIN NAME FUNCTION

1, 12–16 N.C. No Connection. Not internally connected.

2EN Enable Input. Drive EN high to turn on the regulator. Force EN low to place the device in shutdown mode.

3, 4 IN Regulator Input. Supply voltage ranges from 6.5V to 45V. Bypass IN to GND with a low-ESR 47µF

electrolytic capacitor.

5, 6 OUT Regulator Output. Connect at least a 15µF low-ESR capacitor from OUT to GND.

7OUTSENSE Regulator Output Feedback Point. OUTSENSE must be connected to OUT for xed output voltage

versions. Leave OUTSENSE open for adjustable output voltage version.

8GND Ground

9SET

Feedback Regulation Set Point. Connect SET to GND for a xed 3.3V output (MAX5087A) or 5.0V

output (MAX5087B). Connect an external resistive divider network from OUTSENSE to SET to GND to

adjust the output voltage from 2.5V to 11V.

10 RESET Open-Drain Active-Low Reset Output. Connect a 10kΩ pullup resistor from RESET to any supply

voltage up to 11V to create a logic output.

11 CT Reset Timeout Setting Connection. A 2µA charging current is available at CT. Connect a capacitor from

CT to GND to set the reset timeout period (see the Adjustable Reset Timeout Period (CT) section).

—EP Exposed Paddle. Connect externally to a large ground plane to aid heat dissipation. Do not use EP as a

ground connection.

MAX5087 45V, 400mA, Low-Quiescent-Current

Linear Regulator with Adjustable Reset Delay

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Pin Description

Figure 1. Functional Diagram

MAX5087 ERROR

AMPLIFIER

OUT

SET

RESET

GND

OUTSENSE

CONTROL LOGIC,

THERMAL SHUTDOWN,

AND

OVERCURRENT

PROTECTION

MUX

2µA

DELAY

COMPARATOR

0.92 x VREF

VREF

1.235V

INTERNAL

SUPPLY VOLTAGE

MAX5087 45V, 400mA, Low-Quiescent-Current

Linear Regulator with Adjustable Reset Delay

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Detailed Description

The MAX5087 high-voltage linear regulator includes

an integrated μP reset circuit with an adjustable reset

timeout period (see the Adjustable Reset Timeout Period

(CT) section). The device guarantees a 400mA load cur-

rent and is available with a preset output voltage of 3.3V

(MAX5087A) or 5V (MAX5087B). Both devices can be

configured to provide an adjustable output voltage from

2.5V to 11V. The internal reset circuit monitors the regula-

tor output voltage and asserts RESET low when the regu-

lator output falls below the reset threshold voltage. Other

features include an enable (regulator control input), 21μA

(max) shutdown current, short-circuit protection (see the

Output Short-Circuit Current Limit section), and thermal

shutdown (see the Thermal Protection section).

Regulator

The MAX5087 accepts an input voltage range from 6.5V

to 45V and offers a fixed output voltage of 3.3V or 5V. For

an adjustable output voltage operation, use an external

resistive divider network connected between OUT, SET,

and GND (see Figure 2).

Enable Input (EN)

EN is a logic-level enable input that turns the device on/

off. Drive EN high to turn on the device and drive EN low

to place the device in shutdown. The MAX5087 draws

11μA (typ) of supply current when in shutdown. EN with-

stands voltages up to +45V, allowing EN to be connected

to IN for an always-on operation.

Remote Sensing (OUTSENSE)

The 3.3V (MAX5087A) and 5V (MAX5087B) output

voltage versions connect OUTSENSE for load voltage

sensing. Leave OUTSENSE open when using adjustable

output voltage version.

Reset Output (RESET)

A supervisor circuit is fully integrated in the MAX5087 and

uses the same reference voltage as the regulator. RESET

goes low if VOUT drops below the preset output voltage

threshold, and remains low at least for the timeout period

after VOUT rises above the reset voltage threshold.

Adjustable Reset Timeout Period (CT)

The MAX5087 features a user-adjustable reset timeout.

Connect a capacitor from CT to GND to set the reset time-

out period (see Figure 2) and use the following equation

to calculate the timeout period:

tRP = CCT x 0.6175 x 106 (s)

where CCT is the value of the external capacitor con-

nected from CT to GND.

Thermal Protection

When the junction temperature exceeds TJ = +175°C, an

internal thermal sensor signals the shutdown logic, which

turns off the pass transistor, allowing the IC to cool. The

thermal sensor turns the pass transistor on again after

the IC’s junction temperature cools by 25°C, resulting in

a cycled output during continuous thermaloverload condi-

tions. Thermal protection protects the MAX5087 in the

event of fault conditions. During continuous operation, do

not exceed the absolute maximum junction temperature

rating of TJ = +150°C.

Output Short-Circuit Current Limit

The MAX5087 features a current limit. The output can be

shorted to GND for an indefinite period of time (for VIN <

14V) without damage to the device. Continuous output

short-circuit protection is only guaranteed for VIN < 14V.

Figure 2. Setting the Adjustable Output Voltage

6.5V TO 45V 2.5V TO 11V

47µF

CCT

15µF

OUT

OFF OUTSENSE

SET

VOUT = VSET (1 + R1 / R2)

VSET = 1.235V

TO µP RESET

GND

MAX5087

MAX5087 45V, 400mA, Low-Quiescent-Current

Linear Regulator with Adjustable Reset Delay

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Applications Information

Output-Voltage Selection

The MAX5087 features a Dual ModeTM operation, in

either a preset-voltage mode or an adjustable mode. In

preset-voltage mode, internal feedback resistors set the

MAX5087’s output voltage to +3.3V or +5V. Select preset-

voltage mode by connecting SET to ground. In adjustable

mode, select an output between +2.5V and +11V using

two external resistors connected as a voltage-divider to

SET (Figure 2). Set the output voltage using the following

equation:

OUT SET R1

V V 1 R2



= ×+





where VSET = 1.235V and R2 is chosen to be < 100kΩ.

Available Output-Current Calculation

The MAX5087 high-voltage regulator provides up to

400mA of output current. The input voltage extends to

+45V. Package power dissipation limits the amount of out-

put current available for a given input/output voltage and

ambient temperature. Figure 3 shows the maximum power

dissipation curve for these devices. The graph assumes

that the exposed paddle of the MAX5087 package is set

up per JEDEC 51 (multilayer board) specifications.

Use Figure 3 to determine the allowable package dissi-

pation (PD) for a given ambient temperature. Alternately,

use the following formulas to calculate the allowable

package dissipation. Note that for the examples shown

below, the electrical characteristic limits are guaranteed

up to TJ = +125°C (max).

2.666W for T 70 C

P 2.666W 0.0333 (T 70 C)

for 70 C T 125 C

≤+ °





= − × −°





+ ° < ≤+ °



After determining the allowable package dissipation cal-

culate the maximum output current using the following

formula:

OUT(MAX) IN OUT

I 400mA

≅≤

−

The above equations do not include the negligible power

dissipation from self-heating due to the IC ground current.

Example 1:

TA = +95°C

VIN = +14V

VOUT = +5V

Find the maximum allowable output current. First cal-

culate package dissipation at the given temperature as

follows:

P 2.666W 0.0333 (95 C 70 C) 1.8335W

= − °− ° =

Then determine the maximum output current:

OUT(MAX) (1.8335W)

I 203mA

(14V) (5V)

= =

−

Example 2:

TA = +125°C

VIN = +14V

VOUT = +5V

Dual Mode is a trademark of Maxim Integrated Products, Inc.

Figure 3. Calculated Maximum Power Dissipation vs.

Temperature

MAX5087 fig03

TEMPERATURE (°C)

PD (W)

12020 60 80 10040

0.5

1.0

1.5

2.0

2.5

3.0

3.5

4.0

0 140

2.666W

(16-PIN TQFN)

DERATE

33.3mW/°C

MAX5087 45V, 400mA, Low-Quiescent-Current

Linear Regulator with Adjustable Reset Delay

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Calculate package dissipation at the given temperature

as follows:

P 2.666W 0.0333 (125 C 70 C) 0.8345W= − °− ° =

And establish the maximum current:

OUT(MAX) (1.191W)

I 92.7mA

(14V) (5V)

= =

−

Example 3:

TA = +50°C

VIN = +14V

VOUT = +10V

Calculate package dissipation at the given temperature

as follows:

PD = 2.666W

And find the maximum output current:

OUT(MAX) OUT(MAX)

(2.666W)

I 666mA I 400mA

(14V) (10V)

= =⇒=

−

In example 3 the maximum output current is calculated

as 666mA, however, the maximum output current cannot

exceed 400mA.

Use Figure 4 to quickly determine maximum allowable

output current for selected ambient temperatures.

Output-Capacitor Selection and

Regulator Stability

For stable operation over the full temperature range and

with load currents up to 400mA, use a 15μF (min) output

capacitor with an ESR < 0.25Ω. To reduce noise and

improve load-transient response, stability, and power-

supply rejection use larger output capacitor values such

as 22μF.

Some ceramic capacitor dielectrics exhibit large capaci-

tance and ESR variation with temperature. For capacitor

dielectrics such as Y5V, use 22μF or more to ensure

stability at temperatures below -10°C. With X7R or X5R

dielectrics, 15μF should be sufficient at all operating tem-

peratures. To improve power supply rejection and tran-

sient response, use a minimum 47μF low-ESR capacitor

from IN to GND.

Figure 4. Maximum Output Current vs. Input Voltage (16-Pin

TQFN)

MAX5087 fig04

VIN (V)

IOUT(MAX) (A)

454035302520151050

VOUT = +5V

TA = +70°C

TA = +85°C

TA = +125°C

0.25

0.20

0.15

0.10

0.05

0.30

0.35

0.40

0.45

0.50

MAX5087 45V, 400mA, Low-Quiescent-Current

Linear Regulator with Adjustable Reset Delay

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PACKAGE

TYPE

PACKAGE

CODE

OUTLINE

NO.

LAND

PATTERN NO.

16 TQFN-EP T1655+3 21-0140 90-0073

MAX5087 45V, 400mA, Low-Quiescent-Current

Linear Regulator with Adjustable Reset Delay

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Package Information

For the latest package outline information and land patterns

(footprints), go to www.maximintegrated.com/packages. Note

that a “+”, “#”, or “-” in the package code indicates RoHS status

only. Package drawings may show a different suffix character, but

the drawing pertains to the package regardless of RoHS status.

Chip Information

PROCESS: BiCMOS

REVISION

NUMBER

REVISION

DATE DESCRIPTION PAGES

CHANGED

02/06 Initial release —

1 4/06 Updated Ordering Information and Electrical Characteristics tables. 1–3

27/06 Updated Electrical Characteristics table. 2

32/08 Corrected errors in data sheet, reduced operating range, and removed

products from Ordering Information table. 1–13

44/13 Added /V variant to Ordering Information 1

57/13 Changed package code to T1655+3 11

65/14 Updated Applications.1

Maxim Integrated cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim Integrated product. No circuit patent licenses

are implied. Maxim Integrated reserves the right to change the circuitry and specications without notice at any time. The parametric values (min and max limits)

shown in the Electrical Characteristics table are guaranteed. Other parametric values quoted in this data sheet are provided for guidance.

Maxim Integrated and the Maxim Integrated logo are trademarks of Maxim Integrated Products, Inc.

MAX5087 45V, 400mA, Low-Quiescent-Current

Linear Regulator with Adjustable Reset Delay

│

Revision History

For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim Integrated’s website at www.maximintegrated.com.