SC1402ISS datasheet(1/18 Pages) SEMTECH

Numer części	SC1402ISS

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

PDF	18 Pages

Scroll/Zoom	100%

Producent	SEMTECH [Semtech Corporation]

Strona internetowa	http://www.semtech.com

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SC1402

652 MITCHELL ROAD

NEWBURY PARK CA 91320

Multi-Output, Low-Noise Power Supply

Controller for Notebook Computers

December 15, 2000

1

DESCRIPTION

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

systems. The SC1402 utilizes synchronous rectified

buck topologies to generate two voltages, (3.3V and

5V) with up to 95% efficiency. It also provides two lin-

ear 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 synchroniza-

tion. 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.

FEATURES

•= 6V to 30V Input range

•= 3.3V and 5V dual synchronous rectified outputs

•= Fixed frequency or PSAVE 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 shut down

•= 4µA typical shut down current

•= 7mW typical quiescent power

APPLICATIONS

•= Notebook and subnotebook computers

•= PDAs and Mobile communicators

•= Desktop DC-DC converters

DEVICE

PACKAGE

(1)

TEMP. (T

A)

SC1402ISS

SSOP-28

-40 - +85°C

ORDERING INFORMATION:

TEL:805-498-2111 FAX:805-498-3804 WEB:http://www.semtech.com

TYPICAL APPLICATION CIRCUIT

Note:

(1) Only available in tape and reel packaging. (Suffix ‘.TR’).

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