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SC431CZ-1

ADJUSTABLE SHUNT REGULATOR

Semtech Corporation 

ADJUSTABLE SHUNT REGULATOR

SC431

April 13, 1998

TEL:805-498-2111 FAX:805-498-3804 WEB:http://www.semtech.com

DESCRIPTION

The SC431 is a three terminal adjustable shunt regula-

tor with thermal stability guaranteed over temperature.

The output voltage can be adjusted to any value from

2.5V (VREF) to 36V with two external resistors. The

SC431 has a typical dynamic output impedance of

0.25Ω. Active output circuitry provides a very sharp

turn on characteristic, making the SC431 an excellent

replacement for zener diodes.

The SC431 shunt regulator is available in three voltage

tolerances (0.5%, 1.0% and 2.0%) and three package

options (SOT-23-3, SO-8 and TO-92). The three volt-

age tolerances allow the designer the opportunity to

select the proper cost/tolerance for their application.

FEATURES

• Wide operating current range 100µA to 150mA

• Low dynamic output impedance 0.25 Ω typ.

• Trimmed bandgap design + 0.5%

• Alternate for TL431, LM431 & AS431

APPLICATIONS

• Linear Regulators

• Adjustable Supplies

• Switching Power Supplies

• Battery Operated Computers

• Instrumentation

• Computer Disk Drives

PIN CONFIGURATIONS

SOT-23 -3 Lead (Top View)

BLOCK DIAGRAM

SOIC 8 Lead (Top View)

TO-92 (Top View)

SYMBOL DIAGRAM

© 1998 SEMTECH CORP.

1

652 MITCHELL ROAD NEWBURY PARK CA 91320

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