CHARGE PUMP REGULATOR WITH
SELECTABLE 5.0V/4.5V OUTPUT
POWER MANAGEMENT
Description
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.
SC603
Features
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
Applications
Cellular phones
LED photo flash for cellular phones
LED backlighting
PDA power supplies
Portable electronics
Electronic books
Wireless web appliances
Typical Application Circuit
U1
3
Cin
1.0uF
1
4.5V or 5.0V
2
9
Cbucket1
1.0uF
Cout
1.0uF
UP TO 10 LEDS
10
Cbucket2
1.0uF
2.7V to 6.5V
VIN
VOUT
CF1+
6
EN
SC603
CF1-
4
FSEL
CF2+
5
VSEL
GND
8
CF2-
7
November 2, 2004
1
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SEMTECH [ SEMTECH CORPORATION ]
