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LT1790

Micropower SOT-23

Low Dropout Reference Family

FEATURES

DESCRIPTION

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 coefﬁcient and trimmed preci-

sion thin-ﬁlm resistors to achieve high output accuracy. In

addition, each LT1790 is post-package trimmed to greatly

reduce the temperature coefﬁcient 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.

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.

High Accuracy:

A Grade—0.05% Max

B Grade—0.1% Max

Low Drift:

A Grade—10ppm/°C Max

B Grade—25ppm/°C Max

Low Thermal Hysteresis 40ppm (Typical) –40°C to 85°C

Low Supply Current: 60μA Max

Sinks and Sources Current

Low Dropout Voltage

Guaranteed Operational –40°C to 125°C

Wide Supply Range to 18V

Available Output Voltage Options: 1.25V, 2.048V,

2.5V, 3V, 3.3V, 4.096V and 5V

Low Proﬁle (1mm) ThinSOT™ Package

APPLICATIONS

Handheld Instruments

Negative Voltage References

Industrial Control Systems

Data Acquisition Systems

Battery-Operated Equipment

TYPICAL APPLICATION

Positive Connection for LT1790-2.5

1μF

NUMBER OF UNITS

1790 TA01

Typical V

OUT

Distribution for LT1790-2.5

167 UNITS

2.6V ≤ V

≤ 18V

0.1μF

LT1790-2.5

1, 2

OUT

= 2.5V

2.498

2.499 2.500

2.501

OUTPUT VOLTAGE (V)

2.502

1790 TA02

LT1790B LIMITS

LT1790A LIMITS

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LT1790

ABSOLUTE MAXIMUM RATINGS

(Note 1)

PIN CONFIGURATION

TOP VIEW

GND 1

GND 2

DNC* 3

6 V

OUT

5 DNC*

4 V

Input Voltage.............................................................20V

Speciﬁed Temperature Range

Commercial............................................. 0°C to 70°C

Industrial .............................................– 40°C to 85°C

Output Short-Circuit Duration .......................... Indeﬁnite

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

S6 PACKAGE

6-LEAD PLASTIC TSOT-23

JMAX

= 150°C,

= 230°C/W

*DNC: DO NOT CONNECT

ORDER INFORMATION

LEAD FREE FINISH

LT1790ACS6-1.25#PBF

LT1790AIS6-1.25#PBF

LT1790BCS6-1.25#PBF

LT1790BIS6-1.25#PBF

LT1790ACS6-2.048#PBF

LT1790AIS6-2.048#PBF

LT1790BCS6-2.048#PBF

LT1790BIS6-2.048#PBF

LT1790ACS6-2.5#PBF

LT1790AIS6-2.5#PBF

LT1790BCS6-2.5#PBF

LT1790BIS6-2.5#PBF

LT1790ACS6-3#PBF

LT1790AIS6-3#PBF

LT1790BCS6-3#PBF

LT1790BIS6-3#PBF

LT1790ACS6-3.3#PBF

LT1790AIS6-3.3#PBF

LT1790BCS6-3.3#PBF

LT1790BIS6-3.3#PBF

LT1790ACS6-4.096#PBF

LT1790AIS6-4.096#PBF

LT1790BCS6-4.096#PBF

LT1790BIS6-4.096#PBF

LT1790ACS6-5#PBF

LT1790AIS6-5#PBF

LT1790BCS6-5#PBF

LT1790BIS6-5#PBF

TAPE AND REEL

LT1790ACS6-1.25#TRPBF

LT1790AIS6-1.25#TRPBF

LT1790BCS6-1.25#TRPBF

LT1790BIS6-1.25#TRPBF

LT1790ACS6-2.048#TRPBF

LT1790AIS6-2.048#TRPBF

LT1790BCS6-2.048#TRPBF

LT1790BIS6-2.048#TRPBF

LT1790ACS6-2.5#TRPBF

LT1790AIS6-2.5#TRPBF

LT1790BCS6-2.5#TRPBF

LT1790BIS6-2.5#TRPBF

LT1790ACS6-3#TRPBF

LT1790AIS6-3#TRPBF

LT1790BCS6-3#TRPBF

LT1790BIS6-3#TRPBF

LT1790ACS6-3.3#TRPBF

LT1790AIS6-3.3#TRPBF

LT1790BCS6-3.3#TRPBF

LT1790BIS6-3.3#TRPBF

LT1790ACS6-4.096#TRPBF

LT1790AIS6-4.096#TRPBF

LT1790BCS6-4.096#TRPBF

LT1790BIS6-4.096#TRPBF

LT1790ACS6-5#TRPBF

LT1790AIS6-5#TRPBF

LT1790BCS6-5#TRPBF

LT1790BIS6-5#TRPBF

PART MARKING*

LTXT

LTXU

LTPZ

LTQA

LTXW

LTQB

LTQC

PACKAGE DESCRIPTION

6-Lead Plastic TSOT-23

SPECIFIED TEMPERATURE RANGE

0°C to 70°C

–40°C to 85°C

0°C to 70°C

–40°C to 85°C

0°C to 70°C

–40°C to 85°C

0°C to 70°C

–40°C to 85°C

0°C to 70°C

–40°C to 85°C

0°C to 70°C

–40°C to 85°C

0°C to 70°C

–40°C to 85°C

0°C to 70°C

–40°C to 85°C

0°C to 70°C

–40°C to 85°C

0°C to 70°C

–40°C to 85°C

0°C to 70°C

–40°C to 85°C

0°C to 70°C

–40°C to 85°C

0°C to 70°C

–40°C to 85°C

0°C to 70°C

–40°C to 85°C

1790fb

LT1790

ORDER INFORMATION

LEAD BASED FINISH

LT1790ACS6-1.25

LT1790AIS6-1.25

LT1790BCS6-1.25

LT1790BIS6-1.25

LT1790ACS6-2.048

LT1790AIS6-2.048

LT1790BCS6-2.048

LT1790BIS6-2.048

LT1790ACS6-2.5

LT1790AIS6-2.5

LT1790BCS6-2.5

LT1790BIS6-2.5

LT1790ACS6-3

LT1790AIS6-3

LT1790BCS6-3

LT1790BIS6-3

LT1790ACS6-3.3

LT1790AIS6-3.3

LT1790BCS6-3.3

LT1790BIS6-3.3

LT1790ACS6-4.096

LT1790AIS6-4.096

LT1790BCS6-4.096

LT1790BIS6-4.096

LT1790ACS6-5

LT1790AIS6-5

LT1790BCS6-5

LT1790BIS6-5

TAPE AND REEL

LT1790ACS6-1.25#TR

LT1790AIS6-1.25#TR

LT1790BCS6-1.25#TR

LT1790BIS6-1.25#TR

LT1790ACS6-2.048#TR

LT1790AIS6-2.048#TR

LT1790BCS6-2.048#TR

LT1790BIS6-2.048#TR

LT1790ACS6-2.5#TR

LT1790AIS6-2.5#TR

LT1790BCS6-2.5#TR

LT1790BIS6-2.5#TR

LT1790ACS6-3#TR

LT1790AIS6-3#TR

LT1790BCS6-3#TR

LT1790BIS6-3#TR

LT1790ACS6-3.3#TR

LT1790AIS6-3.3#TR

LT1790BCS6-3.3#TR

LT1790BIS6-3.3#TR

LT1790ACS6-4.096#TR

LT1790AIS6-4.096#TR

LT1790BCS6-4.096#TR

LT1790BIS6-4.096#TR

LT1790ACS6-5#TR

LT1790AIS6-5#TR

LT1790BCS6-5#TR

LT1790BIS6-5#TR

PART MARKING*

LTXT

LTXU

LTPZ

LTQA

LTXW

LTQB

LTQC

PACKAGE DESCRIPTION

6-Lead Plastic TSOT-23

SPECIFIED TEMPERATURE RANGE

0°C to 70°C

–40°C to 85°C

0°C to 70°C

–40°C to 85°C

0°C to 70°C

–40°C to 85°C

0°C to 70°C

–40°C to 85°C

0°C to 70°C

–40°C to 85°C

0°C to 70°C

–40°C to 85°C

0°C to 70°C

–40°C to 85°C

0°C to 70°C

–40°C to 85°C

0°C to 70°C

–40°C to 85°C

0°C to 70°C

–40°C to 85°C

0°C to 70°C

–40°C to 85°C

0°C to 70°C

–40°C to 85°C

0°C to 70°C

–40°C to 85°C

0°C to 70°C

–40°C to 85°C

Consult LTC Marketing for parts speciﬁed with wider operating temperature ranges. *The temperature grade is identiﬁed 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 speciﬁcations, go to:

http://www.linear.com/tapeandreel/

1790fb

LT1790

AVAILABLE OPTIONS

TEMPERATURE RANGE

OUTPUT

VOLTAGE

1.250V

2.048V

2.500V

3.000V

3.300V

4.096V

5.000V

INITIAL

ACCURACY

0.05%

0.1%

0.05%

0.1%

0.05%

0.1%

0.05%

0.1%

0.05%

0.1%

0.05%

0.1%

0.05%

0.1%

TEMPERATURE

COEFFICIENT

10ppm/°C

25ppm/°C

10ppm/°C

25ppm/°C

10ppm/°C

25ppm/°C

10ppm/°C

25ppm/°C

10ppm/°C

25ppm/°C

10ppm/°C

25ppm/°C

10ppm/°C

25ppm/°C

0°C TO 70°C

ORDER PART NUMBER

LT1790ACS6-1.25

LT1790BCS6-1.25

LT1790ACS6-2.048

LT1790BCS6-2.048

LT1790ACS6-2.5

LT1790BCS6-2.5

LT1790ACS6-3

LT1790BCS6-3

LT1790ACS6-3.3

LT1790BCS6-3.3

LT1790ACS6-4.096

LT1790BCS6-4.096

LT1790ACS6-5

LT1790BCS6-5

–40°C TO 85°C

ORDER PART NUMBER

LT1790AIS6-1.25

LT1790BIS6-1.25

LT1790AIS6-2.048

LT1790BIS6-2.048

LT1790AIS6-2.5

LT1790BIS6-2.5

LT1790AIS6-3

LT1790BIS6-3

LT1790AIS6-3.3

LT1790BIS6-3.3

LT1790AIS6-4.096

LT1790BIS6-4.096

LT1790AIS6-5

LT1790BIS6-5

1.25V ELECTRICAL CHARACTERISTICS

PARAMETER

Output Voltage (Notes 3, 4)

CONDITIONS

LT1790A

LT1790B

LT1790AC

LT1790AI

LT1790BC

LT1790BI

Output Voltage Temperature Coefﬁcient (Note 5)

MIN

≤ T

MAX

LT1790A

LT1790B

2.6V ≤ V

≤ 18V

The

denotes the speciﬁcations which apply over the speciﬁed

temperature range, otherwise speciﬁcations are at T

= 25°C. C

= 1μF and V

= 2.6V, unless otherwise noted.

MIN

1.24937

–0.05

1.24875

–0.1

TYP

1.25

MAX

1.25062

0.05

1.25125

0.1

1.2515

0.12

1.25219

0.175

1.25344

0.275

1.25516

0.4125

170

220

160

250

180

250

2.15

2.50

2.90

2.95

UNITS

ppm/°C

ppm/V

ppm/mA

1.24850

–0.12

1.24781

–0.175

1.24656

–0.275

1.24484

–0.4125

100

120

Line Regulation

Load Regulation (Note 6)

OUT

Source = 5mA, V

= 2.8V

OUT

Sink = 1mA, V

= 3.2V

Minimum Operating Voltage (Note 7)

, ΔV

OUT

= 0.1%

OUT

= 0mA

OUT

Source = 5mA

OUT

Sink = 1mA

1.95

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LT1790

1.25V ELECTRICAL CHARACTERISTICS

PARAMETER

Supply Current

Minimum Operating Current—

Negative Output (See Figure 7)

Turn-On Time

Output Noise (Note 8)

Long-Term Drift of Output Voltage (Note 9)

Hysteresis (Note 10)

ΔT = 0°C to 70°C

ΔT = –40°C to 85°C

The

denotes the speciﬁcations which apply over the speciﬁed

temperature range, otherwise speciﬁcations are at T

= 25°C. C

= 1μF and V

= 2.6V, unless otherwise noted.

CONDITIONS

No Load

OUT

= – 1.25V, ±0.1%

LOAD

= 1μF

0.1Hz ≤ f ≤ 10Hz

10Hz ≤ f ≤ 1kHz

MIN

TYP

100

250

MAX

125

UNITS

μA

μs

μV

P-P

μV

RMS

ppm/√kHr

ppm

The

denotes the speciﬁcations which apply over the

speciﬁed temperature range, otherwise speciﬁcations are at T

= 25°C. C

= 1μF and V

= 2.8V, unless otherwise noted.

PARAMETER

Output Voltage (Notes 3, 4)

CONDITIONS

LT1790A

LT1790B

LT1790AC

LT1790AI

LT1790BC

LT1790BI

Output Voltage Temperature Coefﬁcient (Note 5)

MIN

≤ T

MAX

LT1790A

LT1790B

2.8V ≤ V

≤ 18V

OUT

Source = 5mA

OUT

Sink = 3mA

Dropout Voltage (Note 7)

– V

OUT

, ΔV

OUT

= 0.1%

OUT

= 0mA

OUT

Source = 5mA

OUT

Sink = 3mA

Supply Current

Minimum Operating Current—

Negative Output (See Figure 7)

Turn-On Time

No Load

OUT

= – 2.048V, 0.1%

LOAD

= 1μF

2.048V ELECTRICAL CHARACTERISTICS

MIN

2.04697

–0.05

2.04595

–0.1

2.04554

–0.12

2.04442

–0.175

2.04237

–0.275

2.03955

–0.4125

TYP

2.048

MAX

2.04902

0.05

2.05005

0.1

2.05046

0.12

2.05158

0.175

2.05363

0.275

2.05645

0.4125

170

220

200

280

260

450

100

500

750

450

125

UNITS

ppm/°C

ppm/V

ppm/mA

μA

μs

120

130

Line Regulation

Load Regulation (Note 6)

100

350

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