www.fairchildsemi.com

REV. 1.0.7 8/5/03

Features

•Low voltage operation to 1.24V

• 1% reference voltage tolerance

•Low 80µA operational cathode current

• 0.25

Ω typical output impedance

•TO-92, SOT23-3 and SOT23-5 packages

Applications

•Voltage reference for discrete power circuits

Description

The RC0431A is a low-voltage 3-terminal adjustable

precision voltage reference regulator. It has an excellent

thermal stability over the standard commercial temperature

range. The output voltage can be set to any value between

Vref (1.24V) and 12V using two external resistors. The

RC0431A operates from a lower voltage (1.24V) than the

traditional shunt regulator references which operate from

2.5V. When used with an optocoupler, the RC0431A will be

an ideal voltage reference in an isolated feedback circuit for

use in switched-mode power supplies and modular DC-DC

converters. The RC0431A has a low output impedance of

active output circuitry offering a very sharp turn-on

characteristic. The RC0431A will be an excellent

replacement for low-voltage zener diodes in many

applications such as on-board regulation and adjustable

power supplies.

Symbol

Block Diagram

RC0431A (RC431A)

Low-Voltage Adjustable Precision Shunt Regulator

REF

65-431A-01

Anode

Cathode

REF

+

_

CATHODE

ANODE

65-431A-02