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SC632_1 Datasheet, PDF (1/14 Pages) Semtech Corporation – Fixed 5.0V Output Charge Pump Regulator | |||
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POWER MANAGEMENT
Features
 Input voltage range â 2.9V to 5.5V
 V tolerance â 5.0V ±3%
OUT
 Continuous output current â 275mA
 Peak output current â 500mA
 Three charge pump modes â 1x, 1.5x and 2x
 Output ripple ⤠30mV for I ⤠400mA
PP
OUT
 Short circuit, over-voltage, and over-temperature
protection
 Soft-start functionality
 Shutdown current â 0.1μA, typical
 Ultra thin package â 2 x 2 x 0.6 (mm)
 Lead free and Halogen free
 WEEE and RoHS compliant
Applications
 Mobile phones
 MP3 players
 USB On-The-Go
 Multi-LED backlit LCDs
 Compact flash/CF+ products
 PMPs
 Digital video cameras
 Digital still cameras
 PDAs
SC632
Fixed 5.0V Output
Charge Pump Regulator
Description
The SC632 is a high-current voltage regulator using
Semtechâs proprietary low-noise charge pump technol-
ogy. Performance is optimized for use in single Li-Ion
battery cell applications. The regulator provides the per-
formance of a linear, low drop-out (LDO) voltage regulator
when the input is greater than 5.0V. Unlike an LDO, drop-
out is avoided when the input is less than 5.0V. Instead, a
charge pump is activated to provide voltage boost and
the head-room needed for voltage regulation.
Only two 2.2μF bucket capacitors are required to deliver
the full output current. The charge pump provides a low
EMI solution compared to inductive boost regulators.
The SC632âs charge pump has three modes of operation:
2x, 1.5x, and 1x modes. The 2x and 1.5x modes deliver
current to the load in each of two phases. The 1x mode
turns off the charge pump, delivering current through an
LDO. When active, the charge pump provides low-ripple
operation at 200kHz, which is typically less than 30mVpp
at the output. The SC632 is capable of delivering 275mA
continuous current, with peak current to 500mA. A 22μF
output capacitor is used for decoupling the load and for
smoothing mode transitions. Hysteresis is provided to
prevent chatter between charge pump modes.
Typical Application Circuit
VBAT
IN
CIN
22μF
OUT
VOUT = 5.0V @ 275mA
COUT
22μF
SC632
Chip
enable
EN
C1+
C1-
C2+
GND
C2-
C1
2.2μF
C2
2.2μF
October 7, 2009
© 2009 Semtech Corporation
Patents Pending
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