SC632
Fixed 5.0V Output
Charge Pump Regulator
POWER MANAGEMENT
Features
Description
Input voltage range — 2.9V to 5.5V
OUT tolerance — 5.0V ±±3
Continuous output current — 275mA
Peak output current — 500mA
Three charge pump modes — 1x, 1.5x and 2x
Output ripple ≤ ±0mVPP for IOUT ≤ 400mA
Short circuit, over-voltage, and over-temperature
protection
The SC6±2 is a high-current voltage regulator using
Semtech’s 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.
V
Soft-start functionality
Shutdown current — 0.1μA, typical
Ultra thin package — 2 x 2 x 0.6 (mm)
Fully WEEE and RoHS compliant
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.
Applications
The SC6±2’s 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 ±0mVpp
at the output. The SC6±2 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.
Mobile phones
MP± players
USB On-The-Go
Multi-LED backlit LCDs
Compact flash/CF+ products
PMPs
Digital video cameras
Digital still cameras
PDAs
The micro lead-frame package is both small and thermally
efficient, measuring 2 x 2 x 0.6 (mm).
Typical Application Circuit
VOUT = 5.0V @ 275mA
IN
OUT
CIN
22μF
COUT
VBAT
22μF
SC632
Chip
enable
C1+
C1-
EN
C1
2.2μF
C2+
C2-
C2
2.2μF
GND
Patents Pending
June 19, 2008
1
© 2008 Semtech Corporation