SC120 Datasheet, PDF (1/21 Pages) Semtech Corporation – Low Voltage Synchronous Boost Converter

SC120
POWER MANAGEMENT
Low Voltage Synchronous
Boost Converter
Features
Description
„ Input voltage — 0.7V to 3.8V
The SC120 is a high efficiency, low noise, synchronous
„ Minimum start-up voltage — 0.85V
step-up DC-DC converter that provides boosted voltage
„ Output voltage — fixed at 3.3V; adjustable from 1.8V levels in low-voltage handheld applications. The wide
to 4.0V
input voltage range allows use in systems with single
„ Peak input current limit — 1.2A typically
NiMH or alkaline battery cells as well as in systems with
„ Output current at 3.3 V — 100mA with V = 1.0V,
OUT
IN
150mA with V = 1.5V
IN
„ Efficiency up to 94%
higher voltage battery supplies. It features an internal
1.2A switch and synchronous rectifier to achieve up to
94% efficiency and to eliminate the need for an external
„ Internal synchronous rectifier
„ Switching frequency — 1.2MHz
„ Automatic power save
L _{„ Anti-ringing circuit}
„ Operating supply current (measured at OUT) — 50μA
IA ^{„ Shutdown current — 0.1μA (typ)}
„ No forward conduction path during shutdown
T „ Available in ultra-thin 1.5 x 2.0 x 0.6 (mm) MLPD-6
package
N _{„ Fully WEEE and RoHS compliant}
E _Applications
ID ^{„ MP3 players}
„ Smart Phones and cellular phones
F ^{„ Palmtop computers and handheld Instruments}
„ PCMCIA cards
N ^{„ Memory cards}
„ Digital cordless phones
„ Personal medical products
O _{„ Wireless VoIP phones}
C „ Small motors
Schottky diode. The output voltage can be set to 3.3V
with internal feedback, or to any voltage within the speci-
fied range using a standard resistor divider.
The SC120 operates in Pulse Width Modulation (PWM)
mode for moderate to high loads and Power Save Mode
(PSAVE) for improved efficiency under light load condi-
tions. It features anti-ringing circuitry for reduced EMI in
noise sensitive applications. Output disconnect capability
is included to reduce leakage current, improve efficiency,
and eliminate external components sometimes needed to
disconnect the load from the supply during shutdown.
Low quiescent current is maintained with a high 1.2MHz
operating frequency. Small external components and the
space saving MLPD-6, 1.5x2.0x0.6mm package make this
device an excellent choice for small handheld applications
that require the longest possible battery life.
Typical Application Circuit
L1
Single
Cell
(1.2V)
C_IN
IN
EN
GND
LX
OUT
FB
SC120
C_OUT
3.3V
August 6, 2009
PRELIMINARY
1