US431L/431AL

2-1

Rev. 1.2

5/11/98

TYPICAL APPLICATION

TYPICAL APPLICATION

DESCRIPTION

DESCRIPTION

The US431L product is a 3 terminal adjustable shunt

regulator that can also be used as a precision voltage

reference. Its output voltage may be set to any value

between Vref(1.24V) and 6V with two external resistors

as shown in the typical application circuit. Other appli-

cations of this device include the use as a merged am-

plifier and reference in applications such as Linear regu-

lator or as the secondary side controller in low voltage

power supply applications. The US431L only requires

80uA maximum quiescent current before regulating,

making it ideal as a voltage reference for battery type

applications.

LOW -VOLTAGE ADJUSTABLE

PRECISION SHUNT REGULATOR

FEATURES

FEATURES

SOT23-5 package

0.5% Voltage Reference Initial Accuracy

(US431AL)

Low Operational Cathode Current

(80 uA max)

Unconditionally Stable with only 1uF

Adjustable Output from 1.24V to 6V

0.25

Ω Typical Output Impedance

Pin to Pin Compatible with TLV431

APPLICATIONS

APPLICATIONS

Precision Voltage Reference

Linear Regulator Controller

Secondary Side Controller for the Low Voltage

Power Supply Applications

PRELIMINARY DATASHEET

PACKAGE ORDER INFORMATION

PACKAGE ORDER INFORMATION

Ta (°C)

5 LEAD

3 PIN PLASTIC

8 PIN PLASTIC

SOT23-5

TO-92

SOIC

0 TO 70

US431LCL

US431LCZ

US431LCS

0 TO 70

US431ALCL

US431ALCZ

US431ALCS

431app1-1.0

R2

Co

R1

US431

V

IN

Typical application of the US431L as a shunt regulator / voltage reference.

Vo

Vref

R

R

=

×

+









1

1

2