SC1403ITS Semtech Corporation, SC1403ITS Datasheet

SC1403ITS

Manufacturer Part Number

SC1403ITS

Description

Manufacturer

Semtech Corporation

Datasheet

1.SC1403ITS.pdf (30 pages)

Specifications of SC1403ITS

Case

TSSOP28

Date_code

06+

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Current page: 1 of 30
Download datasheet (573Kb)

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 (3.3V and 5V) power supplies. An effi-

ciency of 95% can be achieved for the two supplies. The

SC1403 uses Semtech’s proprietary Virtual Current

Sense

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 5V linear regulator takes its input from the bat-

tery; for efficiency, the output is switched to the 5V out-

put 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 200kHz

or 300kHz 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.

Revision 4, October 2002

POWER MANAGEMENT

Description

Typical Application Circuit

™

technology along with external error amplifier

COMP3

BST3

DH3

PHASE3

DL3

CSH3

CSL3

FB3

ON3

ON5

SHDN#

PSAV#

Mobile Multi-Output PWM Controller

V+

GND

SYNC

PHASE5

COMP5

Features

Applications

BST5

PGND

CSH5

CSL5

RST#

DH5

DL5

FB5

SEQ

REF

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

Virtual Current Sense

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

4µA typical shutdown current

6mW typical quiescent power

Notebook and subnotebook computers

Automotive electronics

Desktop DC-DC converters

with Virtual Current Sense

™

United States Patent No. 6,404,175

for enhanced stability

www.semtech.com

SC1403

™

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