SC1153

PROGRAMMABLE SYNCHRONOUS DC/DC

CONTROLLER FOR ADVANCED PROCESSORS

© 2000 SEMTECH CORP.

652 MITCHELL ROAD NEWBURY PARK CA 91320

PRELIMINARY - October 3, 2000

1

Pentium is a registered trademark of Intel Corporation

BLOCK DIAGRAM

PIN CONFIGURATION

Top View

(20-Pin SOIC)

DESCRIPTION

The SC1153 is a low-cost, full featured, synchronous

voltage-mode controller designed for use in single

ended power supply applications where efficiency is of

primary concern. Synchronous operation allows for the

elimination of heat sinks in many applications. The

SC1153 is ideal for implementing DC/DC converters

needed to power advanced microprocessors, such as

Pentium

figurations. Internal level-shift, high-side drive circuitry,

and preset shoot-thru control, allows for use of inex-

pensive n-channel power switches.

SC1153 features include an integrated 5-bit VID DAC,

temperature compensated voltage reference, triangle

wave oscillator, current limit comparator, frequency

shift over-current protection, and an accessible, inter-

nally compensated error amplifier. Power good signal-

ing, logic compatible shutdown, and over voltage pro-

tection are also provided.

The SC1153 operates at a fixed 200KHz, providing an

optimum compromise between efficiency, external

component size, and cost.

FEATURES

APPLICATIONS

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

DEVICE

(1)

PACKAGE

TEMP. RANGE (T

SC1153CSW.TR

SO-20

0 - 125°C

ORDERING INFORMATION

Note:

(1) Only available in tape and reel packaging. A reel

contains 1000 devices.

1.25V REF

D/A

CURRENT LIMIT

OSCILLATOR

200kHz

ERROR

AMP

S

Q

R

70mV

OPEN COLLECTORS

UPPER FET

LEVEL SHIFT

AND DRIVE

SHOOT-THRU

CONTROL

SYNCHRONOUS

FET DRIVE

VCC

OVP

PWRGOOD

VOSENSE

VID4

VID3

VID2

VID1

VID0

VCC CS-

CS+

SHUTDOWN

BSTH

DH

PGNDH

BSTL

DL

PGNDL

GND