1

LT1431

DESCRIPTIO

S

FEATURE

Programmable Reference

s

Guaranteed 0.4% Initial Voltage Tolerance

s

0.1

Ω Typical Dynamic Output Impedance

s

Fast Turn-On

s

Sink Current Capability, 1mA to 100mA

s

Low Reference Pin Current

The LT1431 is an adjustable shunt voltage regulator with

100mA sink capability, 0.4% initial reference voltage tol-

erance, 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 exter-

nal resistor.

A simplified three pin version, the LT1431Z/IZ, is available

for applications as an adjustable reference and is pin

compatible with the TL431.

S

APPLICATI

s

Linear Regulators

s

Adjustable Power Supplies

s

Switching Power Supplies

APPLICATI

TYPICAL

Isolated 5V Regulator

LT1431 • TA01

+

+

SWITCHING

REGULATOR

–

COLL

COMP

V

+

LT1431

GND-F

GND-S

REF

2.5V

5V

+

–

gm =

4mA/V