LT1431



1431fd

Typical applicaTion

FeaTures

DescripTion

Programmable Reference

with 100mA sink capability, 0.4% initial reference voltage

tolerance and 0.3% typical temperature stability. On-chip

divider resistors allow the LT1431 to be configured as a

5V shunt regulator, with 1% initial voltage tolerance and

requiring no additional external components. By adding

two external resistors, the output voltage may be set to

any value between 2.5V and 36V. The nominal internal

current limit of 100mA may be decreased by including

one external resistor.

A simplified 3-pin version, the LT1431CZ/LT1431IZ, is

available for applications as an adjustable reference and

is pin compatible with the TL431.

Isolated 5V Regulator

applicaTions

n

Guaranteed 0.4% Initial Voltage Tolerance

n

0.1Ω Typical Dynamic Output Impedance

n

Fast Turn-On

n

Sink Current Capability, 1mA to 100mA

n

Low Reference Pin Current

n

Available in J8, N8, S8 or 3-Lead TO-92 Z Packages

n

Linear Regulators

n

Adjustable Power Supplies

n

Switching Power Supplies

LT1431 TA01

COLL

COMP

5V

LT1431

GND-F

GND-S

REF

2.5V

+

–

4mA/V

+

SWITCHING

REGULATOR

–

5V

+

TEMPERATURE (°C)

–50

2.4975

2.5000

2.5025

25

75

LT1431 TA01b

2.4950

2.4925

–25

0

50

100

125

2.4900

2.4875

L

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Technology Corporation. All other trademarks are the property of their respective owners.