POWER MANAGEMENT

1

SC4212

Very Low Input /Very Low Dropout

1Amp Regulator With Enable

April 27, 2010

Features

„

Input voltage as low as 1.5V

„

400mV dropout @ 1A

„

Adjustable output from 0.5V

„

Over current and over temperature protection

„

Enable pin

„

10μA quiescent current in shutdown

„

Low reverse leakage (output to input)

„

Full industrial temperature range

„

Available in MLPD-8 Pb-free package, fully WEEE and

RoHS compliant

Applications

„

Telecom/Networking cards

„

Motherboards/Peripheral cards

„

Industrial Applications

„

Wireless infrastructure

„

Set top boxes

„

Medical equipment

„

Notebook computers

Description

The SC4212 is a high performance positive voltage regu-

lator designed for applications requiring very low input

voltage and very low dropout voltage at up to 1 Ampere.

It operates with a VIN as low as 1.5V, with output voltage

programmable as low as 0.5V. The SC4212 features ultra

low dropout, ideal for applications where VOUT is very

close to VIN. Additionally, the SC4212 has an enable pin

to further reduce power dissipation while shutdown. The

SC4212 provides excellent regulation over variations in

line, load and temperature.

The SC4212 is available in a 3 x 3 MLPD-8 package. The

output voltage can be set via external divider or to a

fixed setting of 0.5V depending upon how the FB pin

is configured.

Typical Application Circuit

1

VOUT

VOUT

VOUT

VOUT

FB

FB

FB

FB

GND

GND

GND

GND

VIN

VIN

VIN

VIN

EN

EN

EN

EN

SC4212

SC4212

SC4212

SC4212

C1

C1

C1

C1

VIN

VIN

VIN

VIN

ENABLE

ENABLE

ENABLE

ENABLE

C2

C2

C2

C2

VOUT

VOUT

VOUT

VOUT

R1

R1

R1

R1

R2

R2

R2

R2

(

) ( )

Volts

R

R

R

VOUT

2

2

1

5

.

0

+

=

VOUT

VOUT

VOUT

VOUT

FB

FB

FB

FB

GND

GND

GND

GND

VIN

VIN

VIN

VIN

EN

EN

EN

EN

SC4212

SC4212

SC4212

SC4212

C1

C1

C1

C1

VIN

VIN

VIN

VIN

ENABLE

ENABLE

ENABLE

ENABLE

C2

C2

C2

C2

VOUT

VOUT

VOUT

VOUT

V

VOUT

5

.

0

=