UNISONIC TECHNOLOGIES CO., LTD

ULVH431

Preliminary

LINEAR INTEGRATED CIRCUIT

www.unisonic.com.tw

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Copyright © 2016 Unisonic Technologies Co., Ltd

QW-R103-115.b

LOW-VOLTAGE ADJUSTABLE

PRECISION SHUNT

REGULATOR



DESCRIPTION

The UTC ULVH431 is a low-voltage 3-terminal programmable

shunt regulator with guaranteed thermal stability over full applicable

industrial and commercial temperature ranges.

The output voltage of UTC ULVH431 can be set to any value

voltage (18V) with two external resistors. The device operates from

a lower voltage (1.24V) than the widely used TL431 and TL1431

shunt-regulator references.

The UTC ULVH431 is an ideal voltage reference in isolated

feedback circuits for 3-V to 3.3-V switching-mode power supplies

when it is used with an opto-coupler. It has a typical output

impedance of 0.25Ω. Active output circuitry supplies a very sharp

turn-on characteristic, which makes the UTC ULVH431 very good

substitute for low-voltage Zener diode in many applications such as

adjustable power supplies and on-board regulation.



FEATURES

* Wide operating cathode current range: 100µA to 50mA

* Reference voltage tolerances at 25°C

* 0.25-Ω typical output impedance

* -40°C ~ 125°C specifications



ORDERING INFORMATION

Pin Assignment

Ordering Number

Package

1

2

3

Packing

ULVH431G-AE2-R

SOT-23-3

K

R

A

Tape Reel

ULVH431G-AE3-R

SOT-23

K

R

A

Tape Reel