©2009 Fairchild Semiconductor Corporation

www.fairchildsemi.com

Rev. 1.0.0

Features

• Programmable Output Voltage to 36 Volts

• Low Dynamic Output Impedance 0.20 Typical

• Sink Current Capability of 1.0 to 100mA

• Equivalent Full-Range Temperature Coefficient of

50ppm/

°C Typical

• Temperature Compensated for Operation Over Full Rated

Operating Temperature Range

• Low Output Noise Voltage

• Fast Turn-on Response

Description

The LM431SAI is three terminal output adjustable regulator

with thermal stability over operating temperature range from

-40

°C to +85°C. The output voltage can be set any value

two external resistors. This device has a typical dynamic out-

put impedance of 0.2

Ω Active output circuit provides a

sharp turn-on characteristic, making this device excellent

replacement for Zener Diodes in many applications.

SOT-23F

1

2

3

1. Cathode 2. Ref 3. Anode

Internal Block Diagram

+

-

LM431SAI

Programmable Shunt Regulator