SC1402(2001) データシートの表示（PDF） - Semtech Corporation

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SC1402
(Rev.:2001)

Multi-Output, Low-Noise Power Supply Controller for Notebook Computers

Semtech Corporation 

SC1402

Multi-Output, Low-Noise Power Supply

Controller for Notebook Computers

POWER MANAGEMENT

Description

Features

The SC1402 is pin compatible with the MAX1632 with

improved load regulation performance. The SC1402 is

a multiple-output power supply controller designed to

power logic supply components in battery operated sys-

tems. The SC1402 utilizes synchronous rectified buck

topologies to generate two voltages, (3.3V and 5V fixed

or adjustable) with up to 95% efficiency. It also provides

two linear regulators for system housekeeping functions.

The 12V linear regulator output is generated from a

coupled inductor of the 5V switching regulator.

Control functions include: power up sequencing, soft

start, power-good signaling, automatic bootstrapping for

high side MOSFETs, and frequency synchronization. An

internal precision 2.5V reference ensures ±2% output

voltage. The internal oscillator can be adjusted to

200kHz, 300kHz or synchronized to an external clock.

The MOSFET drivers provide 1A peak drive current for

fast MOSFET switching.

The SC1402 includes a PSAVE enable input to select a

pulse skipping mode for high efficiency or a fixed fre-

quency mode for low noise operation.

! 6V to 30V Input range

! 3.3V and 5V dual synchronous rectified outputs

! Fixed frequency or PSAVE mode for maximum

efficiency over wide load current range

! 5V/50mA linear regulator

! 12V/120mA linear regulator

! Precision 2.5V reference output

! Programmable power-up sequence

! Power-good output (RESET)

! Output over-current protection

! Output over-voltage protection

! Output under-voltage shutdown

! 4µA typical shutdown current

! 7mW typical quiescent power

Applications

! Notebook and subnotebook computers

! PDAs and Mobile communications

! Desktop DC-DC converters

Typical Application Circuit

Revision 3, February 2001

1

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