SC4431CSK-0.5TR datasheet(1/5 Pages) SEMTECH

Part #	SC4431CSK-0.5TR

Description	SHUNT REGULATOR WITH OPEN COLLECTOR OR OUTPUT

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Manufacturer	SEMTECH [Semtech Corporation]

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652 MITCHELL ROAD NEWBURY PARK CA 91320

SHUNT REGULATOR WITH OPEN

COLLECTOR OR OUTPUT

SC4431

PRELIMINARY - September 11, 2000

1

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

DESCRIPTION

The SC4431 is a four terminal device for regulating an

isolated power supply with very low output voltage.

It is intended to be used as a replacement for three ter-

minal shunt regulators such as SC431L where the out-

put voltage is too low for them to function in conjunc-

tion with an opto-isolator. It achieves this by having

seperate supply and output pins, allowing the output to

sink current at voltages as low as 0.2V, while the sup-

ply pin still has sufficient voltage for the device to func-

tion. In this way, allowing for a 1.6V drop through an

opto-isolator diode, regulation down to 1.8V out can be

achieved.

The SC4431 shunt regulator is available with three ini-

tial reference voltage accuracies (0.5%, 1.0% and

2.0%) in the space saving 5-lead SOT-23 package.

The three voltage tolerances allow the designer the

opportunity to select the proper cost/tolerance for their

application.

FEATURES

•= Trimmed bandgap design - initial accuracies to

+ 0.5%

•= 40mA drive capability

•= Wide supply voltage range - 1.5V to 15V

•= Low supply current - typically 110µA

•= Full industrial temperature range

APPLICATIONS

•= Opto driver for very low output voltage isolated

power supplies

ORDERING INFORMATION

Part Number

(1)(2)

Package

SC4431CSK-X.TR

SOT-23-5

Notes:

(1) Where “-X” denotes initial reference voltage toler-

ance. Available options are ±0.5% (-.5), ±1% (-1) and

±2% (-2).

(2) Only available in tape and reel packaging. A reel

contains 3000 devices.

TYPICAL APPLICATION CIRCUIT

2V OUT

R1

U1

4N25

U2

SC4431

1

2

3

4

5

VCC

GND

NC

REF

OUT

R4

10k

R3

6.34k

C2

22nF

C1

33nF

R2

5.1k

VIN

T1

Primary Side

Controller

Secondary Side

Rectification

and Filtering

2V Output Isolated Power Supply

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SC4431CSK-0.5TR Datasheet(PDF) 1 Page - Semtech Corporation

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