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POWER MANAGEMENT

SC603

CHARGE PUMP REGULATOR WITH

SELECTABLE 5.0V/4.5V OUTPUT

November 2, 2004

Description

Features

Applications

Typical Application Circuit

The SC603 is a versatile charge pump designed for use

in battery operated power supply applications. The wide

input range is matched for Li-Ion battery applications.

Only two tiny ceramic bucket capacitors are required, and

the inductorless implementation provides a reduced-EMI

solution. Low noise mode switching circuitry and con-

stant output current allow the use of extremely small

input and output capacitors.

The SC603 charge pump regulator can be used for ap-

plications that require up to 200mA of output current

with a 4.5V output. The 5.0V output version provides up

to 160mA of output current.

Compared to a switch mode regulator, the SC603 offers

a solution with less cost, area, noise and complexity.

Small size - MLP Micro 10 lead 3x3mm package

Selectable 5.0V or 4.5V output voltage

200mA available with 4.5V output

160mA available with 5.0V output

Short circuit protection

Soft Start function

Shutdown current <2µA

Selectable fixed frequencies of 262kHz & 650kHz

Low ripple

Regulated to +/-5%

Ease of use

Cellular phones

LED photo flash for cellular phones

LED backlighting

PDA power supplies

Portable electronics

Electronic books

Wireless web appliances

Cin

1.0uF

2.7V to 6.5V

Cbucket1

1.0uF

Cbucket2

1.0uF

VIN

EN

VSEL

FSEL

GND

CF2-

CF2+

CF1-

CF1+

VOUT

3

6

4

5

8

7

10

9

2

1

U1

Cout

1.0uF

UP TO 10 LEDS

4.5V or 5.0V