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SC1152

PROGRAMMABLE SYNCHRONOUS DC/DC CONTROLLER FOR ADVANCED PROCESSORS

Semtech Corporation 

PROGRAMMABLE SYNCHRONOUS DC/DC

SC1152

CONTROLLER FOR ADVANCED PROCESSORS

April 28, 1998

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

DESCRIPTION

The SC1152 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

SC1152 is ideal for implementing DC/DC converters

needed to power advanced microprocessors such as

Pentium® ll (Klamath), in both single and multiple pro-

cessor configurations. Internal level-shift, high-side

drive circuitry, and preset shoot-thru control, allows for

use of inexpensive n-channel power switches.

SC1152 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 SC1152 operates at a fixed 200KHz, providing an

optimum compromise between efficiency, external

component size, and cost.

FEATURES

• Low cost / full featured

• Synchronous operation

• 5 Bit VID DAC programmable output

• On-chip power good and OVP functions

• Designed to meet Intel VRM8.1 (Pentium® II)

APPLICATIONS

• Pentium® II (Klamath) Core Supply

• Multiple Microprocessor Supplies

• Voltage Regulator Modules (VRM)

• Programmable Power Supplies

• High Efficiency DC/DC Conversion

ORDERING INFORMATION

DEVICE(1)

SC1152CS

PACKAGE

SO-20

TEMP. RANGE (TJ)

0 - 125°C

Note:

(1) Add suffix ‘TR’ for tape and reel.

PIN CONFIGURATION

BLOCK DIAGRAM

Top View

(20-Pin SOIC)

VID4

VID3

VID2

VID1

VID0

VCC

CS(-) CS(+)

1.25V REF

D/A AND

SHUT-

DOWN

LOGIC

CURRENT LIMIT

VCC

70mV +

-

DECODED SHUTDOWN SIGNAL

OSCILLATOR

200 kHz

R

Q

S

VOSENSE

OPEN COLLECTORS

+

-

PWRGOOD

+

-

VCC

+

-

OVP

-

+

-

+

ERROR

AMP

GND

GND

SHUTDOWN

UPPER FET

LEVEL SHIFT

AND DRIVE

SHOOT-THRU

CONTROL

SYNCHRONOUS

FET

DRIVE

BSTH

DH

PGNDH

BSTL

DL

PGNDL

© 1998 SEMTECH CORP.

Pentium is a registered trademark of Intel Corporation

1

652 MITCHELL ROAD NEWBURY PARK CA 91320

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