LT1790
1
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TYPICAL APPLICATION
DESCRIPTION
Micropower SOT-23
Low Dropout Reference Family
FEATURES
APPLICATIONS
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear
Technology Corporation. ThinSOT is a trademark of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
The LT
®
1790 is a family of SOT-23 micropower low dropout
series references that combine high accuracy and low drift
with low power dissipation and small package size. These
micropower references use curvature compensation to
obtain a low temperature coeffi cient and trimmed preci-
sion thin-fi lm resistors to achieve high output accuracy. In
addition, each LT1790 is post-package trimmed to greatly
reduce the temperature coeffi cient and increase the output
accuracy. Output accuracy is further assured by excellent
line and load regulation. Special care has been taken to
minimize thermally induced hysteresis.
The LT1790s are ideally suited for battery-operated sys-
tems because of their small size, low supply current and
reduced dropout voltage. These references provide sup-
ply current and power dissipation advantages over shunt
references that must idle the entire load current to operate.
Since the LT1790 can also sink current, it can operate as
a micropower negative voltage reference with the same
performance as a positive reference.
n High Accuracy:
A Grade—0.05% Max
B Grade—0.1% Max
n Low Drift:
A Grade—10ppm/°C Max
B Grade—25ppm/°C Max
n Low Thermal Hysteresis 40ppm (Typical) –40°C to 85°C
n Low Supply Current: 60μA Max
n Sinks and Sources Current
n Low Dropout Voltage
n Guaranteed Operational –40°C to 125°C
n Wide Supply Range to 18V
n Available Output Voltage Options: 1.25V, 2.048V,
2.5V, 3V, 3.3V, 4.096V and 5V
n Low Profi le (1mm) ThinSOT™ Package
n Handheld Instruments
n Negative Voltage References
n Industrial Control Systems
n Data Acquisition Systems
n Battery-Operated Equipment
Typical VOUT Distribution for LT1790-2.5Positive Connection for LT1790-2.5
0.1μF
2.6V ≤ V
IN
≤ 18V
F
1, 2
6V
OUT
= 2.5V
4LT1790-2.5
1790 TA01
OUTPUT VOLTAGE (V)
2.498 2.499 2.500 2.501 2.502
NUMBER OF UNITS
30
40
50
1790 TA02
20
10
25
35
45
15
5
0
LT1790B LIMITS
LT1790A LIMITS
167 UNITS
LT1790
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PIN CONFIGURATION ABSOLUTE MAXIMUM RATINGS
(Note 1)
ORDER INFORMATION
LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION SPECIFIED TEMPERATURE RANGE
LT1790ACS6-1.25#PBF LT1790ACS6-1.25#TRPBF LTXT 6-Lead Plastic TSOT-23 0°C to 70°C
LT1790AIS6-1.25#PBF LT1790AIS6-1.25#TRPBF LTXT 6-Lead Plastic TSOT-23 –40°C to 85°C
LT1790BCS6-1.25#PBF LT1790BCS6-1.25#TRPBF LTXT 6-Lead Plastic TSOT-23 0°C to 70°C
LT1790BIS6-1.25#PBF LT1790BIS6-1.25#TRPBF LTXT 6-Lead Plastic TSOT-23 –40°C to 85°C
LT1790ACS6-2.048#PBF LT1790ACS6-2.048#TRPBF LTXU 6-Lead Plastic TSOT-23 0°C to 70°C
LT1790AIS6-2.048#PBF LT1790AIS6-2.048#TRPBF LTXU 6-Lead Plastic TSOT-23 –40°C to 85°C
LT1790BCS6-2.048#PBF LT1790BCS6-2.048#TRPBF LTXU 6-Lead Plastic TSOT-23 0°C to 70°C
LT1790BIS6-2.048#PBF LT1790BIS6-2.048#TRPBF LTXU 6-Lead Plastic TSOT-23 –40°C to 85°C
LT1790ACS6-2.5#PBF LT1790ACS6-2.5#TRPBF LTPZ 6-Lead Plastic TSOT-23 0°C to 70°C
LT1790AIS6-2.5#PBF LT1790AIS6-2.5#TRPBF LTPZ 6-Lead Plastic TSOT-23 –40°C to 85°C
LT1790BCS6-2.5#PBF LT1790BCS6-2.5#TRPBF LTPZ 6-Lead Plastic TSOT-23 0°C to 70°C
LT1790BIS6-2.5#PBF LT1790BIS6-2.5#TRPBF LTPZ 6-Lead Plastic TSOT-23 –40°C to 85°C
LT1790ACS6-3#PBF LT1790ACS6-3#TRPBF LTQA 6-Lead Plastic TSOT-23 0°C to 70°C
LT1790AIS6-3#PBF LT1790AIS6-3#TRPBF LTQA 6-Lead Plastic TSOT-23 –40°C to 85°C
LT1790BCS6-3#PBF LT1790BCS6-3#TRPBF LTQA 6-Lead Plastic TSOT-23 0°C to 70°C
LT1790BIS6-3#PBF LT1790BIS6-3#TRPBF LTQA 6-Lead Plastic TSOT-23 –40°C to 85°C
LT1790ACS6-3.3#PBF LT1790ACS6-3.3#TRPBF LTXW 6-Lead Plastic TSOT-23 0°C to 70°C
LT1790AIS6-3.3#PBF LT1790AIS6-3.3#TRPBF LTXW 6-Lead Plastic TSOT-23 –40°C to 85°C
LT1790BCS6-3.3#PBF LT1790BCS6-3.3#TRPBF LTXW 6-Lead Plastic TSOT-23 0°C to 70°C
LT1790BIS6-3.3#PBF LT1790BIS6-3.3#TRPBF LTXW 6-Lead Plastic TSOT-23 –40°C to 85°C
LT1790ACS6-4.096#PBF LT1790ACS6-4.096#TRPBF LTQB 6-Lead Plastic TSOT-23 0°C to 70°C
LT1790AIS6-4.096#PBF LT1790AIS6-4.096#TRPBF LTQB 6-Lead Plastic TSOT-23 –40°C to 85°C
LT1790BCS6-4.096#PBF LT1790BCS6-4.096#TRPBF LTQB 6-Lead Plastic TSOT-23 0°C to 70°C
LT1790BIS6-4.096#PBF LT1790BIS6-4.096#TRPBF LTQB 6-Lead Plastic TSOT-23 –40°C to 85°C
LT1790ACS6-5#PBF LT1790ACS6-5#TRPBF LTQC 6-Lead Plastic TSOT-23 0°C to 70°C
LT1790AIS6-5#PBF LT1790AIS6-5#TRPBF LTQC 6-Lead Plastic TSOT-23 –40°C to 85°C
LT1790BCS6-5#PBF LT1790BCS6-5#TRPBF LTQC 6-Lead Plastic TSOT-23 0°C to 70°C
LT1790BIS6-5#PBF LT1790BIS6-5#TRPBF LTQC 6-Lead Plastic TSOT-23 –40°C to 85°C
Input Voltage .............................................................20V
Specifi ed Temperature Range
Commercial............................................. 0°C to 70°C
Industrial .............................................40°C to 85°C
Output Short-Circuit Duration .......................... Indefi nite
Operating Temperature Range
(Note 2) ..................................................40°C to 125°C
Storage Temperature Range
(Note 3) ..................................................65°C to 150°C
Lead Temperature (Soldering, 10 sec) .................. 300°C
1
2
3
6
5
4
TOP VIEW
S6 PACKAGE
6-LEAD PLASTIC TSOT-23
TJMAX = 150°C, θJA = 230°C/W
*DNC: DO NOT CONNECT
VOUT
DNC*
VIN
GND
GND
DNC*
LT1790
3
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ORDER INFORMATION
LEAD BASED FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION SPECIFIED TEMPERATURE RANGE
LT1790ACS6-1.25 LT1790ACS6-1.25#TR LTXT 6-Lead Plastic TSOT-23 0°C to 70°C
LT1790AIS6-1.25 LT1790AIS6-1.25#TR LTXT 6-Lead Plastic TSOT-23 –40°C to 85°C
LT1790BCS6-1.25 LT1790BCS6-1.25#TR LTXT 6-Lead Plastic TSOT-23 0°C to 70°C
LT1790BIS6-1.25 LT1790BIS6-1.25#TR LTXT 6-Lead Plastic TSOT-23 –40°C to 85°C
LT1790ACS6-2.048 LT1790ACS6-2.048#TR LTXU 6-Lead Plastic TSOT-23 0°C to 70°C
LT1790AIS6-2.048 LT1790AIS6-2.048#TR LTXU 6-Lead Plastic TSOT-23 –40°C to 85°C
LT1790BCS6-2.048 LT1790BCS6-2.048#TR LTXU 6-Lead Plastic TSOT-23 0°C to 70°C
LT1790BIS6-2.048 LT1790BIS6-2.048#TR LTXU 6-Lead Plastic TSOT-23 –40°C to 85°C
LT1790ACS6-2.5 LT1790ACS6-2.5#TR LTPZ 6-Lead Plastic TSOT-23 0°C to 70°C
LT1790AIS6-2.5 LT1790AIS6-2.5#TR LTPZ 6-Lead Plastic TSOT-23 –40°C to 85°C
LT1790BCS6-2.5 LT1790BCS6-2.5#TR LTPZ 6-Lead Plastic TSOT-23 0°C to 70°C
LT1790BIS6-2.5 LT1790BIS6-2.5#TR LTPZ 6-Lead Plastic TSOT-23 –40°C to 85°C
LT1790ACS6-3 LT1790ACS6-3#TR LTQA 6-Lead Plastic TSOT-23 0°C to 70°C
LT1790AIS6-3 LT1790AIS6-3#TR LTQA 6-Lead Plastic TSOT-23 –40°C to 85°C
LT1790BCS6-3 LT1790BCS6-3#TR LTQA 6-Lead Plastic TSOT-23 0°C to 70°C
LT1790BIS6-3 LT1790BIS6-3#TR LTQA 6-Lead Plastic TSOT-23 –40°C to 85°C
LT1790ACS6-3.3 LT1790ACS6-3.3#TR LTXW 6-Lead Plastic TSOT-23 0°C to 70°C
LT1790AIS6-3.3 LT1790AIS6-3.3#TR LTXW 6-Lead Plastic TSOT-23 –40°C to 85°C
LT1790BCS6-3.3 LT1790BCS6-3.3#TR LTXW 6-Lead Plastic TSOT-23 0°C to 70°C
LT1790BIS6-3.3 LT1790BIS6-3.3#TR LTXW 6-Lead Plastic TSOT-23 –40°C to 85°C
LT1790ACS6-4.096 LT1790ACS6-4.096#TR LTQB 6-Lead Plastic TSOT-23 0°C to 70°C
LT1790AIS6-4.096 LT1790AIS6-4.096#TR LTQB 6-Lead Plastic TSOT-23 –40°C to 85°C
LT1790BCS6-4.096 LT1790BCS6-4.096#TR LTQB 6-Lead Plastic TSOT-23 0°C to 70°C
LT1790BIS6-4.096 LT1790BIS6-4.096#TR LTQB 6-Lead Plastic TSOT-23 –40°C to 85°C
LT1790ACS6-5 LT1790ACS6-5#TR LTQC 6-Lead Plastic TSOT-23 0°C to 70°C
LT1790AIS6-5 LT1790AIS6-5#TR LTQC 6-Lead Plastic TSOT-23 –40°C to 85°C
LT1790BCS6-5 LT1790BCS6-5#TR LTQC 6-Lead Plastic TSOT-23 0°C to 70°C
LT1790BIS6-5 LT1790BIS6-5#TR LTQC 6-Lead Plastic TSOT-23 –40°C to 85°C
Consult LTC Marketing for parts specifi ed with wider operating temperature ranges. *The temperature grade is identifi ed by a label on the shipping container.
For more information on lead free part marking, go to: http://www.linear.com/leadfree/
For more information on tape and reel specifi cations, go to: http://www.linear.com/tapeandreel/
LT1790
4
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AVAILABLE OPTIONS
OUTPUT
VOLTAGE
INITIAL
ACCURACY
TEMPERATURE
COEFFICIENT
TEMPERATURE RANGE
0°C TO 70°C 40°C TO 85°C
ORDER PART NUMBER ORDER PART NUMBER
1.250V 0.05%
0.1%
10ppm/°C
25ppm/°C
LT1790ACS6-1.25
LT1790BCS6-1.25
LT1790AIS6-1.25
LT1790BIS6-1.25
2.048V 0.05%
0.1%
10ppm/°C
25ppm/°C
LT1790ACS6-2.048
LT1790BCS6-2.048
LT1790AIS6-2.048
LT1790BIS6-2.048
2.500V 0.05%
0.1%
10ppm/°C
25ppm/°C
LT1790ACS6-2.5
LT1790BCS6-2.5
LT1790AIS6-2.5
LT1790BIS6-2.5
3.000V 0.05%
0.1%
10ppm/°C
25ppm/°C
LT1790ACS6-3
LT1790BCS6-3
LT1790AIS6-3
LT1790BIS6-3
3.300V 0.05%
0.1%
10ppm/°C
25ppm/°C
LT1790ACS6-3.3
LT1790BCS6-3.3
LT1790AIS6-3.3
LT1790BIS6-3.3
4.096V 0.05%
0.1%
10ppm/°C
25ppm/°C
LT1790ACS6-4.096
LT1790BCS6-4.096
LT1790AIS6-4.096
LT1790BIS6-4.096
5.000V 0.05%
0.1%
10ppm/°C
25ppm/°C
LT1790ACS6-5
LT1790BCS6-5
LT1790AIS6-5
LT1790BIS6-5
PARAMETER CONDITIONS MIN TYP MAX UNITS
Output Voltage (Notes 3, 4) LT1790A 1.24937
–0.05
1.25 1.25062
0.05
V
%
LT1790B 1.24875
0.1
1.25 1.25125
0.1
V
%
LT1790AC l
l
1.24850
–0.12
1.25 1.2515
0.12
V
%
LT1790AI l
l
1.24781
–0.175
1.25 1.25219
0.175
V
%
LT1790BC l
l
1.24656
–0.275
1.25 1.25344
0.275
V
%
LT1790BI l
l
1.24484
–0.4125
1.25 1.25516
0.4125
V
%
Output Voltage Temperature Coeffi cient (Note 5) TMIN ≤ TA ≤ TMAX
LT1790A
LT1790B
l
l
5
12
10
25
ppm/°C
ppm/°C
Line Regulation 2.6V ≤ VIN ≤ 18V
l
50 170
220
ppm/V
ppm/V
Load Regulation (Note 6) IOUT Source = 5mA, VIN = 2.8V
l
100 160
250
ppm/mA
ppm/mA
IOUT Sink = 1mA, VIN = 3.2V
l
120 180
250
ppm/mA
ppm/mA
Minimum Operating Voltage (Note 7) VIN, ΔVOUT = 0.1%
I
OUT = 0mA
I
OUT Source = 5mA
I
OUT Sink = 1mA
l
l
l
1.95 2.15
2.50
2.90
2.95
V
V
V
V
1.25V ELECTRICAL CHARACTERISTICS
The l denotes the specifi cations which apply over the specifi ed
temperature range, otherwise specifi cations are at TA = 25°C. CL = 1μF and VIN = 2.6V, unless otherwise noted.
LT1790
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PARAMETER CONDITIONS MIN TYP MAX UNITS
Supply Current No Load
l
35 60
75
μA
μA
Minimum Operating Current—
Negative Output (See Figure 7)
VOUT = –1.25V, ±0.1% 100 125 μA
Turn-On Time CLOAD = 1μF 250 μs
Output Noise (Note 8) 0.1Hz ≤ f ≤ 10Hz
10Hz ≤ f ≤ 1kHz
10
14
μVP-P
μVRMS
Long-Term Drift of Output Voltage (Note 9) 50 ppm/√kHr
Hysteresis (Note 10) ΔT = 0°C to 70°C
ΔT = –40°C to 85°C
l
l
25
40
ppm
ppm
1.25V ELECTRICAL CHARACTERISTICS
The l denotes the specifi cations which apply over the specifi ed
temperature range, otherwise specifi cations are at TA = 25°C. CL = 1μF and VIN = 2.6V, unless otherwise noted.
2.048V ELECTRICAL CHARACTERISTICS
The l denotes the specifi cations which apply over the
specifi ed temperature range, otherwise specifi cations are at TA = 25°C. CL = 1μF and VIN = 2.8V, unless otherwise noted.
PARAMETER CONDITIONS MIN TYP MAX UNITS
Output Voltage (Notes 3, 4) LT1790A 2.04697
0.05
2.048 2.04902
0.05
V
%
LT1790B 2.04595
–0.1
2.048 2.05005
0.1
V
%
LT1790AC l
l
2.04554
–0.12
2.048 2.05046
0.12
V
%
LT1790AI l
l
2.04442
–0.175
2.048 2.05158
0.175
V
%
LT1790BC l
l
2.04237
–0.275
2.048 2.05363
0.275
V
%
LT1790BI l
l
2.03955
–0.4125
2.048 2.05645
0.4125
V
%
Output Voltage Temperature Coeffi cient (Note 5) TMIN ≤ TA ≤ TMAX
LT1790A
LT1790B
l
l
5
12
10
25
ppm/°C
ppm/°C
Line Regulation 2.8V ≤ VIN ≤ 18V
l
50 170
220
ppm/V
ppm/V
Load Regulation (Note 6) IOUT Source = 5mA
l
120 200
280
ppm/mA
ppm/mA
IOUT Sink = 3mA
l
130 260
450
ppm/mA
ppm/mA
Dropout Voltage (Note 7) VIN – VOUT, ΔVOUT = 0.1%
I
OUT = 0mA
I
OUT Source = 5mA
I
OUT Sink = 3mA
l
l
l
50 100
500
750
450
mV
mV
mV
mV
Supply Current No Load
l
35 60
75
μA
μA
Minimum Operating Current—
Negative Output (See Figure 7)
VOUT = –2.048V, 0.1% 100 125 μA
Turn-On Time CLOAD = 1μF 350 μs
LT1790
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2.5V ELECTRICAL CHARACTERISTICS
The l denotes the specifi cations which apply over the specifi ed
temperature range, otherwise specifi cations are at TA = 25°C. CL = 1μF and VIN = 3V, unless otherwise noted.
PARAMETER CONDITIONS MIN TYP MAX UNITS
Output Voltage (Notes 3, 4) LT1790A 2.49875
0.05
2.5 2.50125
0.05
V
%
LT1790B 2.4975
–0.1
2.5 2.5025
0.1
V
%
LT1790AC l
l
2.4970
–0.12
2.5 2.5030
0.12
V
%
LT1790AI l
l
2.49563
–0.175
2.5 2.50438
0.175
V
%
LT1790BC l
l
2.49313
–0.275
2.5 2.50688
0.275
V
%
LT1790BI l
l
2.48969
–0.4125
2.5 2.51031
0.4125
V
%
Output Voltage Temperature Coeffi cient (Note 5) TMIN ≤ TA ≤ TMAX
LT1790A
LT1790B
l
l
5
12
10
25
ppm/°C
ppm/°C
Line Regulation 3V ≤ VIN ≤ 18V
l
50 170
220
ppm/V
ppm/V
Load Regulation (Note 6) IOUT Source = 5mA
l
80 160
250
ppm/mA
ppm/mA
IOUT Sink = 3mA
l
70 110
300
ppm/mA
ppm/mA
Dropout Voltage (Note 7) VIN – VOUT, ΔVOUT = 0.1%
I
OUT = 0mA
I
OUT Source = 5mA
I
OUT Sink = 3mA
l
l
l
50 100
120
450
250
mV
mV
mV
mV
Supply Current No Load
l
35 60
80
μA
μA
Minimum Operating Current—
Negative Output (See Figure 7)
VOUT = –2.5V, 0.1% 100 125 μA
Turn-On Time CLOAD = 1μF 700 μs
Output Noise (Note 8) 0.1Hz ≤ f ≤ 10Hz
10Hz ≤ f ≤ 1kHz
32
48
μVP-P
μVRMS
Long-Term Drift of Output Voltage (Note 9) 50 ppm/√kHr
Hysteresis (Note 10) ΔT = 0°C to 70°C
ΔT = –40°C to 85°C
l
l
25
40
ppm
ppm
PARAMETER CONDITIONS MIN TYP MAX UNITS
Output Noise (Note 8) 0.1Hz ≤ f ≤ 10Hz
10Hz ≤ f ≤ 1kHz
22
41
μVP-P
μVRMS
Long-Term Drift of Output Voltage (Note 9) 50 ppm/√kHr
Hysteresis (Note 10) ΔT = 0°C to 70°C
ΔT = –40°C to 85°C
l
l
25
40
ppm
ppm
2.048V ELECTRICAL CHARACTERISTICS
The l denotes the specifi cations which apply over the
specifi ed temperature range, otherwise specifi cations are at TA = 25°C. CL = 1μF and VIN = 2.8V, unless otherwise noted.
LT1790
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3V ELECTRICAL CHARACTERISTICS
The l denotes the specifi cations which apply over the specifi ed
temperature range, otherwise specifi cations are at TA = 25°C. CL = 1μF and VIN = 3.5V, unless otherwise noted.
PARAMETER CONDITIONS MIN TYP MAX UNITS
Output Voltage (Notes 3, 4) LT1790A 2.9985
0.05
3 3.0015
0.05
V
%
LT1790B 2.9970
0.10
3 3.0030
0.10
V
%
LT1790AC l
l
2.99640
–0.12
3 3.00360
0.12
V
%
LT1790AI l
l
2.99475
–0.175
3 3.00525
0.175
V
%
LT1790BC l
l
2.99175
–0.275
3 3.00825
0.275
V
%
LT1790BI l
l
2.98763
–0.4125
3 3.01238
0.4125
V
%
Output Voltage Temperature Coeffi cient (Note 5) TMIN ≤ TA ≤ TMAX
LT1790A
LT1790B
l
l
5
12
10
25
ppm/°C
ppm/°C
Line Regulation 3.5V ≤ VIN ≤ 18V
l
50 170
220
ppm/V
ppm/V
Load Regulation (Note 6) IOUT Source = 5mA
l
80 160
250
ppm/mA
ppm/mA
IOUT Sink = 3mA
l
70 110
300
ppm/mA
ppm/mA
Dropout Voltage (Note 7) VIN – VOUT
, ΔVOUT = 0.1%
I
OUT = 0mA
I
OUT Source = 5mA
I
OUT Sink = 3mA
l
l
l
50 100
120
450
250
mV
mV
mV
mV
Supply Current No Load
l
35 60
80
μA
μA
Minimum Operating Current—
Negative Output (See Figure 7)
VOUT = –3V, 0.1% 100 125 μA
Turn-On Time CLOAD = 1μF 700 μs
Output Noise (Note 8) 0.1Hz ≤ f ≤ 10Hz
10Hz ≤ f ≤ 1kHz
50
56
μVP-P
μVRMS
Long-Term Drift of Output Voltage (Note 9) 50 ppm/√kHr
Hysteresis (Note 10) ΔT = 0°C to 70°C
ΔT = –40°C to 85°C
l
l
25
40
ppm
ppm
LT1790
8
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3.3V ELECTRICAL CHARACTERISTICS
The l denotes the specifi cations which apply over the specifi ed
temperature range, otherwise specifi cations are at TA = 25°C. CL = 1μF and VIN = 3.8V, unless otherwise noted.
PARAMETER CONDITIONS MIN TYP MAX UNITS
Output Voltage (Notes 3, 4) LT1790A 3.29835
0.05
3.3 3.30165
0.05
V
%
LT1790B 3.2967
0.10
3.3 3.3033
0.10
V
%
LT1790AC l
l
3.29604
–0.120
3.3 3.30396
0.120
V
%
LT1790AI l
l
3.29423
–0.175
3.3 3.30578
0.175
V
%
LT1790BC l
l
3.29093
–0.275
3.3 3.30908
0.275
V
%
LT1790BI l
l
3.28639
–0.4125
3.3 3.31361
0.4125
V
%
Output Voltage Temperature Coeffi cient (Note 5) TMIN ≤ TA ≤ TMAX
LT1790A
LT1790B
l
l
5
12
10
25
ppm/°C
ppm/°C
Line Regulation 3.8V ≤ VIN ≤ 18V
l
50 170
220
ppm/V
ppm/V
Load Regulation (Note 6) IOUT Source = 5mA
l
80 160
250
ppm/mA
ppm/mA
IOUT Sink = 3mA
l
70 110
300
ppm/mA
ppm/mA
Dropout Voltage (Note 7) VIN – VOUT, ΔVOUT = 0.1%
I
OUT = 0mA
I
OUT Source = 5mA
I
OUT Sink = 3mA
l
l
l
50 100
120
450
250
mV
mV
mV
mV
Supply Current No Load
l
35 60
80
μA
μA
Minimum Operating Current—
Negative Output (See Figure 7)
VOUT = –3.3V, 0.1% 100 125 μA
Turn-On Time CLOAD = 1μF 700 μs
Output Noise (Note 8) 0.1Hz ≤ f ≤ 10Hz
10Hz ≤ f ≤ 1kHz
50
67
μVP-P
μVRMS
Long-Term Drift of Output Voltage (Note 9) 50 ppm/√kHr
Hysteresis (Note 10) ΔT = 0°C to 70°C
ΔT = –40°C to 85°C
l
l
25
40
ppm
ppm
LT1790
9
1790fb
4.096V ELECTRICAL CHARACTERISTICS
The l denotes the specifi cations which apply over the
specifi ed temperature range, otherwise specifi cations are at TA = 25°C. CL = 1μF and VIN = 4.6V, unless otherwise noted.
PARAMETER CONDITIONS MIN TYP MAX UNITS
Output Voltage (Notes 3, 4) LT1790A 4.094
0.05
4.096 4.098
0.05
V
%
LT1790B 4.092
0.10
4.096 4.10
0.10
V
%
LT1790AC l
l
4.09108
–0.120
4.096 4.10092
0.120
V
%
LT1790AI l
l
4.08883
–0.175
4.096 4.10317
0.175
V
%
LT1790BC l
l
4.08474
–0.275
4.096 4.10726
0.275
V
%
LT1790BI l
l
4.07910
–0.4125
4.096 4.11290
0.4125
V
%
Output Voltage Temperature Coeffi cient (Note 5) TMIN ≤ TA ≤ TMAX
LT1790A
LT1790B
l
l
5
12
10
25
ppm/°C
ppm/°C
Line Regulation 4.6V ≤ VIN ≤ 18V
l
50 170
220
ppm/V
ppm/V
Load Regulation (Note 6) IOUT Source = 5mA
l
80 160
250
ppm/mA
ppm/mA
IOUT Sink = 3mA
l
70 110
300
ppm/mA
ppm/mA
Dropout Voltage (Note 7) VIN – VOUT
, ΔVOUT = 0.1%
I
OUT = 0mA
I
OUT Source = 5mA
I
OUT Sink = 3mA
l
l
l
50 100
120
450
250
mV
mV
mV
mV
Supply Current No Load
l
35 60
80
μA
μA
Minimum Operating Current—
Negative Output (See Figure 7)
VOUT = –4.096V, 0.1% 100 125 μA
Turn-On Time CLOAD = 1μF 700 μs
Output Noise (Note 8) 0.1Hz ≤ f ≤ 10Hz
10Hz ≤ f ≤ 1kHz
60
89
μVP-P
μVRMS
Long-Term Drift of Output Voltage (Note 9) 50 ppm/√kHr
Hysteresis (Note 10) ΔT = 0°C to 70°C
ΔT = –40°C to 85°C
l
l
25
40
ppm
ppm
LT1790
10
1790fb
5V ELECTRICAL CHARACTERISTICS
The l denotes the specifi cations which apply over the specifi ed
temperature range, otherwise specifi cations are at TA = 25°C. CL = 1μF and VIN = 5.5V, unless otherwise noted.
PARAMETER CONDITIONS MIN TYP MAX UNITS
Output Voltage (Notes 3, 4) LT1790A 4.9975
0.05
5 5.0025
0.05
V
%
LT1790B 4.995
0.10
5 5.005
0.10
V
%
LT1790AC l
l
4.99400
–0.120
5 5.00600
0.120
V
%
LT1790AI l
l
4.99125
–0.175
5 5.00875
0.175
V
%
LT1790BC l
l
4.98625
–0.275
5 5.01375
0.275
V
%
LT1790BI l
l
4.97938
–0.4125
5 5.02063
0.4125
V
%
Output Voltage Temperature Coeffi cient (Note 5) TMIN ≤ TA ≤ TMAX
LT1790A
LT1790B
l
l
5
12
10
25
ppm/°C
ppm/°C
Line Regulation 5.5V ≤ VIN ≤ 18V
l
50 170
220
ppm/V
ppm/V
Load Regulation (Note 6) IOUT Source = 5mA
l
80 160
250
ppm/mA
ppm/mA
IOUT Sink = 3mA
l
70 110
300
ppm/mA
ppm/mA
Dropout Voltage (Note 7) VIN – VOUT
, ΔVOUT = 0.1%
I
OUT = 0mA
I
OUT Source = 5mA
I
OUT Sink = 3mA
l
l
l
50 100
120
450
250
mV
mV
mV
mV
Supply Current No Load
l
35 60
80
μA
μA
Minimum Operating Current—
Negative Output (See Figure 7)
VOUT = –5V, 0.1% 100 125 μA
Turn-On Time CLOAD = 1μF 700 μs
Output Noise (Note 8) 0.1Hz ≤ f ≤ 10Hz
10Hz ≤ f ≤ 1kHz
80
118
μVP-P
μVRMS
Long-Term Drift of Output Voltage (Note 9) 50 ppm/√kHr
Hysteresis (Note 10) ΔT = 0°C to 70°C
ΔT = –40°C to 85°C
l
l
25
40
ppm
ppm
Note 1: Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
Note 2: The LT1790 is guaranteed functional over the operating
temperature range of –40°C to 125°C. The LT1790-1.25 at 125°C is
typically less than 2% above the nominal voltage. The other voltage
options are typically less than 0.25% above their nominal voltage.
Note 3: If the part is stored outside of the specifi ed temperature range, the
output voltage may shift due to hysteresis.
Note 4: ESD (Electrostatic Discharge) sensitive device. Extensive use of
ESD protection devices are used internal to the LT1790, however, high
electrostatic discharge can damage or degrade the device. Use proper ESD
handling precautions.
Note 5: Temperature coeffi cient is measured by dividing the change in
output voltage by the specifi ed temperature range. Incremental slope is
also measured at 25°C.
Note 6: Load regulation is measured on a pulse basis from no load to the
specifi ed load current. Output changes due to die temperature change
must be taken into account separately.
Note 7: Excludes load regulation errors.
LT1790
11
1790fb
1.25V TYPICAL PERFORMANCE CHARACTERISTICS
TEMPERATURE (°C)
–50
1.247
OUTPUT VOLTAGE (V)
1.248
1.249
1.250
1.251
–10 30 70 110
17091.25 G01
1.252
1.253
–30 10 50 90
FOUR TYPICAL PARTS
INPUT-OUTPUT VOLTAGE (V)
OUTPUT CURRENT (mA)
10
17901.25 G02
0.1
1
0.5 2.521.51
0
TA = 125°C TA = –55°C
TA = 25°C
TEMPERATURE (°C)
–50
0
VOLTAGE DIFFERENTIAL (V)
0.1
0.3
0.4
0.5
1.0
0.7
–10 30 50 130
17091.25 G03
0.2
0.8
0.9
0.6
–30 10 70 90 110
5mA100μA
1mA
OUTPUT CURRENT (mA)
0.1
–2000
OUTPUT VOLTAGE CHANGE (ppm)
–1600
–1200
–800
–400
110
17901.25 G04
0
–1800
–1400
–1000
–600
–200
TA = –55°C
TA = 25°C
TA = 125°C
OUTPUT CURRENT (mA)
0.1
0
OUTPUT VOLTAGE CHANGE (ppm)
400
800
1200
1600
110
17901.25 G05
2000
200
600
1000
1400
1800
TA = –55°C
TA = 25°C
TA = 125°C
INPUT VOLTAGE (V)
SUPPLY CURRENT (μA)
60
80
100
15
17901.25 G06
40
20
50
70
90
30
10
05
010 20
TA = –55°C
TA = 25°C
TA = 125°C
Output Voltage Temperature Drift
Load Regulation (Sourcing)
Minimum Input-Output Voltage
Differential (Sourcing)
Minimum Input-Output Voltage
Differential (Sinking)
Load Regulation (Sinking) Supply Current vs Input Voltage
Note 8: Peak-to-peak noise is measured with a single pole highpass fi lter
at 0.1Hz and a 2-pole lowpass fi lter at 10Hz. The unit is enclosed in a still
air environment to eliminate thermocouple effects on the leads. The test
time is 10 seconds. Integrated RMS noise is measured from 10Hz to 1kHz
with the HP3561A analyzer.
Note 9: Long-term drift typically has a logarithmic characteristic and
therefore changes after 1000 hours tend to be smaller than before that
time. Long-term drift is affected by differential stress between the IC and
the board material created during board assembly. See the Applications
Information section.
Note 10: Hysteresis in the output voltage is created by package stress that
differs depending on whether the IC was previously at a higher or lower
temperature. Output voltage is always measured at 25°C, but the IC is
cycled to 85°C or –40°C before a successive measurements. Hysteresis
is roughly proportional to the square of the temperature change.
Hysteresis is not a problem for operational temperature excursions where
the instrument might be stored at high or low temperature. See the
Applications Information section.
ELECTRICAL CHARACTERISTICS
Each of the voltage options have similar performance curves. For the 3V, 3.3V and the 4.096V options,
the curves can be estimated based on the 2.5V and 5V curves.
LT1790
12
1790fb
1.25V TYPICAL PERFORMANCE CHARACTERISTICS
INPUT VOLTAGE (V)
0
OUTPUT VOLTAGE (V)
1.255
1.265
1.275
1.285
16
17901.25. G07
1.245
1.235
1.250
1.260
1.270
1.280
1.240
1.230
1.225 4812
218
610 14 20
TA = –55°C
TA = 25°C
TA = 125°C
FREQUENCY (Hz)
–60
POWER SUPPLY REJECTION RATIO (dB)
0
10
–70
–80
–10
–40
–20
–30
–50
100 10k 100k 1M
17901.25 G08
–90 1k
VIN = 3V
CL = 1μF
FREQUENCY (Hz)
1
OUTPUT IMPEDANCE (Ω)
10
100
100 10k 100k
17901.25 G09
01k
500 VIN = 3V
CL = 0.47μF
CL = 4.7μF
CL = 1μF
OUTPUT TO GROUND VOLTAGE (V)
0
CURRENT IN RL (mA)
0.10
0.20
0.30
0.05
0.15
0.25
–2.0 –1.5 –1.0 –0.5
17091.25 G10
0–2.5
–VEE
VOUT
3V
RL
5k
4
21
6
1μF
LT1790-1.25
R1 10k
TA = 25°C
TA = 125°C
TA = –55°C
HOURS
0
ppm
60
100
140
800
17901.25 G11
20
–20
40
80
120
0
–40
–60 200 400 600 1000
LT1790S6-1.25V
2 TYPICAL PARTS SOLDERED TO PCB
TA = 30°C
TIME (SEC)
0
OUTPUT NOISE (5μV/DIV)
8
17901.25 G12
246 107135 9
FREQUENCY (Hz)
10
2.0
NOISE VOLTAGE (μV/√Hz)
2.5
3.0
3.5
4.0
100 1k 10k
17901.25 G13
1.5
1.0
0.5
0
4.5
5.0 CL = 1μF
IO = 100μA
IO = 0μA
IO = 250μA
IO = 1mA
FREQUENCY (Hz)
1
INTEGRATED NOISE (μVRMS)
10
100
10010 1000
17901.25 G14
Line Regulation Output Impedance vs Frequency
Power Supply Rejection Ratio
vs Frequency
1.25V Characteristics
Long-Term Drift
(Data Points Reduced After 500 Hr) Output Noise 0.1Hz to 10Hz
Output Voltage Noise Spectrum Integrated Noise 10Hz to 1kHz
Each of the voltage options have similar performance curves. For the 3V, 3.3V and the 4.096V options,
the curves can be estimated based on the 2.5V and 5V curves.
LT1790
13
1790fb
2.048V TYPICAL PERFORMANCE CHARACTERISTICS
TEMPERATURE (°C)
–50
OUTPUT VOLTAGE (V)
70 90 110
2.056
2.054
2.052
2.050
2.048
2.046
2.044
2.042
17902.048 G01
–30 –10 10 30 50 130
FOUR TYPICAL PARTS
INPUT-OUTPUT VOLTAGE (V)
0.1
0.1
1
10
0.3
17902.048 G02
OUTPUT CURRENT (mA)
00.70.2 0.4 0.5 0.6
TA = 25°C TA = 125°C
TA = –55°C
TEMPERATURE (°C)
–50
–50
VOLTAGE DIFFERENTIAL (mV)
–30
10
30
50
70
130
17902.048 G03
–10
10 130
50
–10 110
30
–30 90
70
90
110
5mA
1mA
100μA
OUTPUT CURRENT (mA)
0.1
–2000
OUTPUT VOLTAGE CHANGE (ppm)
–1600
–1200
–800
–400
110
17902.048 G04
0
–1800
–1400
–1000
–600
–200
TA = 25°C
TA = 125°C
TA = –55°C
OUTPUT CURRENT (mA)
0.1
0
OUTPUT VOLTAGE CHANGE (ppm)
400
800
1200
1600
110
17902.048 G05
2000
200
600
1000
1400
1800
TA = –40°C
TA = 25°C
TA = 125°C
INPUT VOLTAGE (V)
0
SUPPLY CURRENT (μA)
40
50
60
20
17902.048 G06
30
20
0510 15
10
80
70 TA = –55°C
TA = 25°C
TA = 125°C
INPUT VOLTAGE (V)
OUTPUT VOLTAGE (V)
2.054
2.052
2.050
2.048
2.046
2.044
2.042 4 8 12 16
17902.048 G07
2020 6 10 14 18
TA = –55°C
TA = 25°C
TA = 125°C
FREQUENCY (Hz)
–60
POWER SUPPLY REJECTION RATIO (dB)
10
0
20
–70
–80
–10
–40
–20
–30
–50
100 10k 100k 1M
17902.048 G08
1k
CL = 1μF
FREQUENCY (Hz)
10k
1
OUTPUT IMPEDANCE (Ω)
10
100
1000
100k 1M 10M
17902.048 G09
CL = 0.47μF
CL = 4.7μF
CL = 1μF
Output Voltage Temperature Drift
Load Regulation (Sourcing)
Minimum Input-Output Voltage
Differential (Sourcing)
Minimum Input-Output Voltage
Differential (Sinking)
Load Regulation (Sinking) Supply Current vs Input Voltage
Line Regulation Output Impedance vs Frequency
Power Supply Rejection Ratio
vs Frequency
Each of the voltage options have similar performance curves. For the 3V, 3.3V and the 4.096V options,
the curves can be estimated based on the 2.5V and 5V curves.
LT1790
14
1790fb
2.048V TYPICAL PERFORMANCE CHARACTERISTICS
2.048V Characteristics Long-Term Drift
Output Noise 0.1Hz to 10Hz Output Voltage Noise Spectrum
Integrated Noise 10Hz to 1kHz
OUTPUT TO GROUND VOLTAGE (V)
0
CURRENT IN RL (mA)
0.10
0.20
0.30
0.05
0.15
0.25
–3.5 –3 –2.5 –2 –1.5 –1 –0.5
17092.048 G10
0–4
–VEE
VOUT
3V
RL
5k
4
21
6
1μF
LT1790-2.048
R1 10k
TA = 125°C
TA = 25°C
TA = –55°C
HOURS
0
ppm
60
100
800
17902.048 G11
20
–20
40
80
0
–40
–60
–80
–100 200 400 600 1000
TA = 30°C
2 TYPICAL PARTS SOLDERED TO PCB
TIME (SEC)
0
OUTPUT NOISE (10μV/DIV)
8
17902.048 G12
246 107135 9
FREQUENCY (Hz)
10
4
NOISE VOLTAGE (μV/√Hz)
5
6
7
8
100 1k 10k
17902.048 G13
3
2
1
0
9
10 CL = 1μF
IO = 100μA
IO = 0μA
IO = 250μA
IO = 1mA
FREQUENCY (Hz)
1
INTEGRATED NOISE (μVRMS)
10
100
10010 1000
17902.048 G14
Each of the voltage options have similar performance curves. For the 3V, 3.3V and the 4.096V options,
the curves can be estimated based on the 2.5V and 5V curves.
LT1790
15
1790fb
2.5 TYPICAL PERFORMANCE CHARACTERISTICS
TEMPERATURE (°C)
–50
OUTPUT VOLTAGE (V)
30 70
17902.5 G01
–30 –10 50 90 110
2.508
2.506
2.504
2.502
2.500
2.498
2.496
2.494 10 130
FOUR TYPICAL PARTS
INPUT-OUTPUT VOLTAGE (V)
0 0.1 0.2
0.1
OUTPUT CURRENT (mA)
1
10
0.3 0.4 0.5 0.6
17902.5 G02
TA = –55°C TA = 125°C
TA = 25°C
TEMPERATURE (°C)
–50
–30
VOLTAGE DIFFERENTIAL (mV)
–10
30
50
70
–10 30 50 130
17902.5 G03
10
–30 10 70 90 110
90
100μA
5mA
1mA
OUTPUT CURRENT (mA)
0.1
–2000
OUTPUT VOLTAGE CHANGE (ppm)
–1600
–1200
–800
–400
110
17902.5 G04
0
–1800
–1400
–1000
–600
–200 TA = 25°C
TA = 125°C
TA = –55°C
OUTPUT CURRENT (mA)
0.1
0
OUTPUT VOLTAGE CHANGE (ppm)
400
800
1200
1600
11