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LT1790

Micropower SOT-23

Low Dropout Reference Family

FEATURES

DESCRIPTION

The

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

systems because of their small size, low supply current

and reduced dropout voltage. These references provide

supply 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

2.6V ≤ V

≤ 18V

0.1µF

LT1790-2.5

1, 2

1µF

NUMBER OF UNITS

1790 TA01

Typical V

OUT

Distribution for LT1790-2.5

OUT

= 2.5V

167 UNITS

LT1790B LIMITS

LT1790A LIMITS

2.498

2.499 2.500

2.501

OUTPUT VOLTAGE (V)

2.502

1790 TA02

1790fc

For more information

www.linear.com/LT1790

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

http://www.linear.com/product/LT1790#orderinfo

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

1790fc

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

For more information

www.linear.com/LT1790

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/.

Some packages are available in 500 unit reels through

designated sales channels with #TRMPBF suffix.

1790fc

For more information

www.linear.com/LT1790

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

1790fc

1.24850

–0.12

1.24781

–0.175

1.24656

–0.275

1.24484

–0.4125

100

Line Regulation

Load Regulation (Note 6)

OUT

Source = 5mA, V

= 2.8V

OUT

Sink = 1mA, V

= 3.2V

120

Minimum Operating Voltage (Note 7)

, ∆V

OUT

= 0.1%

OUT

= 0mA

OUT

Source = 5mA

OUT

Sink = 1mA

1.95

For more information

www.linear.com/LT1790

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)

∆T = 0°C to 70°C

∆T = –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

MIN

TYP

100

250

MAX

125

UNITS

µA

µs

µV

P-P

µV

RMS

ppm/√kHr

ppm

OUT

= – 1.25V, ±0.1%

LOAD

= 1µF

0.1Hz ≤ f ≤ 10Hz

10Hz ≤ f ≤ 1kHz

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

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

Line Regulation

Load Regulation (Note 6)

OUT

Source = 5mA

OUT

Sink = 3mA

130

Dropout Voltage (Note 7)

– V

OUT

, ∆V

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

100

350

OUT

= – 2.048V, 0.1%

LOAD

= 1µF

1790fc

For more information

www.linear.com/LT1790