©2011 Fairchild Semiconductor Corporation

www.fairchildsemi.com

Rev. 1.0.3

Features

• Programmable Output Voltage to 36 Volts

• Low Dynamic Output Impedance 0.2

Ω 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 FAN431/FAN431A/FAN431L are three terminal

output adjustable regulators with thermal stability over

operating temperature range. The output voltage can be set

volts with two external resistors. These devices have a

typical dynamic output impedance of 0.2

Ω. Active output

circuit provides a sharp turn-on characteristic, making these

devices excellent replacement for Zener Diodes in many

applications.

1. Ref 2. Anode 3. Cathode

1

TO-92

Internal Block Diagram

2.5 Vref

CATHODE

ANODE

REFERENCE

ANODE(A)

REFERENCE (R)

CATHODE (K)

+

-

FAN431/FAN431A/FAN431L

Programmable Shunt Regulator