POWER MANAGEMENT

1

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SC553

150mA Ultra Low Dropout

Regulator with Adjustable Output

Features

Revision: April 20, 2004

Description

The SC553 is a low dropout linear regulator that

operates from a +2.25V to +6.5V input range and

delivers up to 150mA. A PMOS pass transistor allows

the low 75µA supply current to remain independent of

load, making these devices ideal for battery operated

portable equipment such as cellular phones, cordless

phones and personal digital assistants.

The SC553 has an adjust pin (ADJ) enabling the user to

set the output voltage anywhere from 1.25V to 6V. For a

low noise version, see SC1453 and for an error flag see

SC1457. Other features include low powered shutdown,

short circuit protection, thermal shutdown protection and

reverse battery protection. The SC553 comes in the tiny

5 lead SOT-23 package.

temperature

with ceramic capacitors

U1

SC553

1

2

3

4

5

IN

GND

EN

ADJ

OUT

R2

C1

1uF

R1

VIN

C2

1uF

VOUT

Applications

Typical Application Circuit











 +

•

=

2

R

1

R

1

250

.

1

V

OUT