sc1403 Semtech Corporation, sc1403 Datasheet

sc1403

Manufacturer Part Number

sc1403

Description

Sc1403 Mobile Multi-output Pwm Controller With Lossless Current Sense

Manufacturer

Semtech Corporation

Datasheet

1.SC1403.pdf (31 pages)

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Download datasheet (562Kb)

The SC1403 is a multiple-output power supply controller

designed to power battery operated systems. The

SC1403 provides synchronous buck converter control

for two (3.3V and 5V) power supplies. An efficiency of

95% can be achieved for the two supplies. The SC1403

uses Semtech’s proprietary Virtual Current Sense

nology along with external error amplifier compensation

to achieve enhanced stability and DC accuracy over a

wide range of output filter components while maintain-

ing fixed frequency operation. Lossless current sensing

can be used to eliminate current sense resistors and

reduce cost. The SC1403 also provides a 5V linear regu-

lator for system housekeeping. The 5V linear regulator

is derived from the battery; for improved efficiency, the

output is switched to the 5V output when available.

Control functions include power-up sequencing, soft start,

power-good signaling, and frequency synchronization. Line

and load regulation is to +/-1%. The internal oscillator

can be set to 200kHz, 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 skip-

ping mode for high efficiency at light load, or fixed fre-

quency mode for low noise operation.

Revision 5, April 2004

POWER MANAGEMENT

Description

Typical Application Circuit

™

tech-

Mobile Multi-Output PWM Controller

Features

Applications

3.3V and 5V dual synchronous outputs, resistor

programmable to 2.5V

Fixed frequency or PSAVE operation for maximum

efficiency over wide load range

5V / 50mA linear regulator

Virtual Current Sense

Lossless current limiting

Out of phase switching reduces input capacitance

External compensation supports wide range of

output filter components

Programmable power-up sequence

Power Good output

Output overvoltage and overcurrent protection with

output undervoltage shutdown

6µA typical shutdown current

6mW typical quiescent power

Notebook and subnotebook computers

Tablet PCs

Embedded applications

with Lossless Current Sense

™

United States Patent No. 6,377,032

for enhanced stability

www.semtech.com

SC1403

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