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SC1154
(Rev.:2000)

PROGRAMMABLE SYNCHRONOUS DC/DC HYSTERETIC CONTROLLER FOR ADVANCED PROCESSORS

Semtech Corporation 

PROGRAMMABLE SYNCHRONOUS

DC/DC HYSTERETIC CONTROLLER

FOR ADVANCED PROCESSORS

SC1154

PRELIMINARY - March 1, 2000

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

DESCRIPTION

The SC1154 is a synchronous-buck switch-mode con-

troller designed for use in single ended power supply

applications where efficiency is the primary concern.

The controller is a hysteretic type, with a user se-

lectable hysteresis. The SC1154 is ideal for imple-

menting DC/DC converters needed to power advanced

microprocessors such as Pentium® ll, in both single

and multiple processor configurations. Inhibit, under-

voltage lockout and soft-start functions are included for

controlled power-up.

SC1154 features include an integrated 5 bit D/A con-

verter, temperature compensated voltage reference,

current limit comparator, over-current protection, and

an adaptive deadtime circuit to prevent shoot-through

of the power MOSFET during switching transitions.

Power good signaling, logic compatible shutdown, and

over-voltage protection are also provided. The inte-

grated D/A converter provides programmability of out-

put voltage from 2.0V to 3.5V in 100mV increments

and 1.3V to 2.05V in 50mV increments with no external

components.

The SC1154 high side driver can be configured as ei-

ther a grounded reference or as a floating bootstrap

driver. High and low side drivers have a peak current

rating of 2 amps.

FEATURES

• Programmable hysteresis

• 5 bit DAC programmable output (1.3V-3.5V)

• On-chip power good and OVP functions

• Designed to meet latest Intel specifications

• Up to 95% efficiency

• +1% tolerance over temperature

APPLICATIONS

• Server Systems and Workstations

• Pentium® II Core Supply

• Multiple Microprocessor Supplies

• Voltage Regulator Modules

ORDERING INFORMATION

DEVICE(1) PACKAGE

SC1154CSW SO-28

TEMP. RANGE (TJ)

0 - 125°C

Note:

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

PIN CONFIGURATION

Top View

SIMPLIFIED BLOCK DIAGRAM

(28-Pin SOIC)

© 2000 SEMTECH CORP.

Pentium is a registered trademark of Intel Corporation

1

652 MITCHELL ROAD NEWBURY PARK CA 91320

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