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SC1403ITSTR Datasheet

  • SC1403ITSTR

  • Mobile Multi-Output PWM Controller with Virtual Current Sens...

  • 30頁

  • SEMTECH   SEMTECH

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Mobile Multi-Output PWM Controller
with Virtual Current Sense
TM
POWER MANAGEMENT
Description
The SC1403 is a multiple-output power supply controller
designed to power battery operated systems. The
SC1403 provides synchronous rectified buck converter
control for two (3.3 V and 5 V) power supplies. An effi-
ciency of 95% can be achieved for the two supplies. The
SC1403 uses Semtech鈥檚 proprietary Virtual Current
Sense
TM
technology along with external error amplifier
compensation to achieve enhanced stability and DC ac-
curacy over a wide range of output filter components
while maintaining fixed frequency operation. The SC1403
also provides a linear regulator for system housekeep-
ing. The 5 V linear regulator takes its input from the
battery; for efficiency, the output is switched to the 5V
output when available.
Control functions include: power up sequencing, soft
start, power-good signaling, and frequency synchroniza-
tion. Line and load regulation is to +/-1% of the output
voltage. The internal oscillator can be adjusted to 200
kHz or 300 kHz or synchronized to an external clock.
The MOSFET drivers provide >1A peak drive current for
fast MOSFET switching.
The SC1403 includes a PSAVE# input to select pulse
skipping mode for high efficiency at light load, or fixed
frequency mode for low noise operation.
SC1403
PRELIMINARY
Features
3.3V and 5V dual synchronous outputs, resistor
programmable to 2.5V
Fixed frequency or PSAVE for maximum efficiency
over wide load current range
5V / 50mA linear regulator
TM
Virtual Current Sense for enhanced stability
Accurate low loss current limiting
Out of phase switching reduces input capacitance
requirements
External compensation supports wide range of
output filter components
Programmable power-up sequence
Power good output
Output overvoltage & overcurrent protection with
output undervoltage shutdown
4碌A(chǔ) typical shutdown current
6mW typical quiescent power
Applications
Notebook and subnotebook computers
Automotive electronics
Desktop DC-DC converters
Typical Application Circuit
SHDN#
V+ SYNC VL
4
COMP3
COMP5
5
BST3
BST5
DH3
L1
PHASE3
DL3
DH5
L2
PHASE5
DL5
PGND
CSH3
CSL3
FB3
CSH5
CSL5
FB5
SEQ
ON3
REF
ON5
RST#
PSAV#
GND
Revision 3, August 2002
1
www.semtech.com

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