sc4431csk-2-tr Semtech Corporation, sc4431csk-2-tr Datasheet

sc4431csk-2-tr

Manufacturer Part Number

sc4431csk-2-tr

Description

Sc4431 Shunt Regulator With Open Collector Or Output

Manufacturer

Semtech Corporation

Datasheet

1.SC4431CSK-2-TR.pdf (8 pages)

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The SC4431 is a four terminal device for regulating an

isolated power supply with output voltages down to 1.5V.

It is intended to be used as a replacement for three

terminal shunt regulators such as SC431L where the

output voltage is too low for the device to function in

conjunction with an opto-isolator. SC4431 achieves this

by having seperate supply and output pins, allowing the

output to sink current at voltages as low as 0.1V, while

the supply pin still has sufficient voltage for the device to

function. In this way, allowing for a 1.4V drop through an

opto-isolator diode, regulation down to 1.5V out can be

achieved.

The SC4431 shunt regulator is available with three

initial 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.

POWER MANAGEMENT

Revision September 9 ,2003

Typical Application Circuit

Description

VIN

Primary Side

Controller

2V Output Isolated Power Supply

Secondary Side

Rectification

and Filtering

4N25

Features

Applications

Open Collector output drives Optoisolator with

as little as 1.5V input voltage

Trimmed bandgap design - initial accuracies

to + 0.5%

40mA drive capability

Regulates output as low as 50mV

Wide supply voltage range - 1.5V to 15V

Low supply current - typically 110µA

Full industrial temperature range

SOT-23 5 lead package

Telecom Power Supplies

Opto driver for very low output voltage (1.5V)

Battery operated applications

Point of use power supplies

isolated power supplies

22nF

5.1k

OUT

Open Collector Output

Shunt Regulator With

GND

SC4431

VCC

REF

33nF

2V OUT

www.semtech.com

SC4431

6.34k

10k

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sc4431csk-2-tr Summary of contents

Page 1

POWER MANAGEMENT Description The SC4431 is a four terminal device for regulating an isolated power supply with output voltages down to 1.5V intended to be used as a replacement for three terminal shunt regulators such as SC431L where ...

Page 2

POWER MANAGEMENT Absolute Maximum Rating ...

Page 3

... Notes: (1) Only available in tape and reel packaging. (Suffix ‘.TR’ e.g. SC4431CSK-X.TR). (2) Where “-X” denotes initial reference voltage toler- ance. Available options are ±0.5% (-.5), ±1% (-1) and ±2% (-2 ...

Page 4

POWER MANAGEMENT Typical Characteristics V ref ...

Page 5

POWER MANAGEMENT Typical Characteristics 3.5000 3.0000 2.5000 2.0000 1.5000 1.0000 0.5000 0.0000 -0.5000 1.2248 1.2703 1.3048 Vref(v) Vcc=2V,Io=1.3mA Vcc=5V,Io=1.3mA Typical Icc vs Vref 1.3mA Deg.C. +Vref_Adjust 10uF R5 1k ...

Page 6

POWER MANAGEMENT Typical Gain Phase -10 - -10 - 10u J4 1 GND 2003 Semtech Corp. ...

Page 7

POWER MANAGEMENT Typical Applications +V Monitor +Vprimary R3 U2 PWM disable C1 4 Vref 2003 Semtech Corp. +Vcc Vref SC4431 2 Power good Circuit Power good Circuit Power good Circuit ...

Page 8

... Phone: (805)498-2111 FAX (805)498-3804 2003 Semtech Corp. SOT -23 SOT 23 Semtech Corporation Power Management Products Division 200 Flynn Road, Camarillo, CA 93012 8 SC4431 Shunt Regulator With Open Collector Output -23- 5L -23- 5L -23- 5L ECN00 - 88 ECN00 - 881 ...

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