SC613 Datasheet, PDF (1/14 Pages) Semtech Corporation – Low Noise Regulated Charge Pump with Selectable Output

POWER MANAGEMENT
SC613
Low Noise Regulated Charge
Pump with Selectable Output
Description
Features
The SC613 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 1uF ceramic
bucket capacitors are required, and the inductorless implementa-
tion provides a reduced-EMI solution. Low noise mode switching
circuitry and constant output current allow the use of 1uF input
and output capacitors.
The SC613 charge pump regulator can be used for applications
that require up to 140mA of output current with a 4.5V output.
The 5.0V output version provides up to 100mA of output current.
The small package size, low component count and lower overall
system cost coupled with its low noise make the SC613 a supe-
rior solution compared to switch mode regulator designs.
Typical Application Circuit
Small size - MLP Micro 10 lead 3x3mm package
Selectable 5.0V or 4.5V output voltage
140mA available with 4.5V output
100mA available with 5.0V output
Short circuit protection
Soft Start function
Shutdown current <2µA
Selectable fixed frequencies of 262kHz and 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
2.7V to 6.5V
Cin
1.0uF
3
VIN
6 _EN
4 _FSEL
5
VSEL
U1
1
VOUT
2
CF1+
9
CF1-
10
CF2+
7
CF2-
GND
8
4.5V or 5.0V
Cbucket1
1.0uF
Cbucket2
1.0uF
Cout
1.0uF
UP TO 10 LEDS
February 8, 2005
1
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