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POWER MANAGEMENT

Description

The SC4211 is a high performance positive voltage

regulator designed for use in applications requiring very

low Input voltage and very low dropout voltage at up to 1

amp. It operates with a Vin as low as 1.4V, with output

voltage programmable as low as 0.5V. The SC4211 fea-

tures ultra low dropout, ideal for applications where Vout

is very close to Vin. Additionally, the SC4211 has an en-

able pin to further reduce power dissipation while shut-

down. The SC4211 provides excellent regulation over varia-

tions in line, load and temperature.

The SC4211 is available in the SOIC-8EDP (Exposed Die

Pad) package. The output voltage can be set via an exter-

nal divider or to 0.5V depending on how the FB pin is con-

figured.

Very Low Input /Very Low Dropout

1 Amp Regulator With Enable

Features

Input Voltage as low as 1.4V

250mV dropout @ 1A

Adjustable output from 0.5V to 3.3V

Over current and over temperature protection

Enable pin

10碌A(chǔ) quiescent current in shutdown

Low reverse leakage (output to input)

Full industrial temperature range

Available in SOIC-8EDP package

SC4211

Applications

Telecom/Networking cards

Motherboards/Peripheral cards

Industrial Applications

Wireless infrastructure

Set top boxes

Medical equipment

Notebook computers

Battery powered systems

Typical Application Circuits

SC4211

4

NC

VIN

EN

NC

NC

VO

FB

GND

5

6

7

8

VIN

ENABLE

3

2

1

VO

R1

VO

C2

=

0.5 (R1

+

R2)

R2

Volts

C1

U1

R2

SC4211

4

NC

VIN

EN

NC

NC

VO

FB

GND

5

6

7

8

VIN

ENABLE

3

2

1

VO = 0.5V

C1

U1

C2

Revision October 18, 2004

1

www.semtech.com

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