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PROGRAMMABLE SYNCHRONOUS

DC/DC HYSTERETIC CONTROLLER

FOR ADVANCED PROCESSORS

PRELIMINARY - March 1, 2000

SC1154

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

廬

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

鈥?/div>

Programmable hysteresis

鈥?/div>

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

鈥?/div>

On-chip power good and OVP functions

鈥?/div>

Designed to meet latest Intel specifications

鈥?/div>

Up to 95% efficiency

鈥?/div>

+1% tolerance over temperature

APPLICATIONS

鈥?/div>

Server Systems and Workstations

鈥?/div>

Pentium

廬

II Core Supply

鈥?/div>

Multiple Microprocessor Supplies

鈥?/div>

Voltage Regulator Modules

ORDERING INFORMATION

DEVICE

(1)

PACKAGE

SO-28

TEMP. RANGE (T

J

)

0 - 125擄C

SC1154CSW

Note:

(1) Add suffix 鈥楾R鈥?for tape and reel.

PIN CONFIGURATION

Top View

SIMPLIFIED BLOCK DIAGRAM

(28-Pin SOIC)

Pentium is a registered trademark of Intel Corporation

1

漏 2000 SEMTECH CORP.

652 MITCHELL ROAD NEWBURY PARK CA 91320

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