SC1151

© 1998 SEMTECH CORP.

652 MITCHELL ROAD NEWBURY PARK CA

PROGRAMMABLE DC/DC CONTROLLER

FOR ADVANCED MICROPROCESSORS

March 11, 1998

1

ABSOLUTE MAXIMUM RATINGS

Parameter

Symbol

Maximum

Units

V

V

IN

-0.3 to 7

V

PGND to GND

± 1

V

BST to GND

-0.3 to 15

V

Operating

Temperature Range

T

A

0 to 70

°C

Storage

Temperature Range

T

STG

-65 to +150

°C

Lead Temperature

(Soldering) 10 sec

T

LEAD

300

°C

Pentium is a registered trademark of Intel Corporation

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

DESCRIPTION

The SC1151 voltage mode controller contains most of

the circuitry necessary to implement a DC/DC con-

verter for powering advanced microprocessors such

as Klamath, both in single and multiple processor con-

figurations.

The SC1151 features an integrated 5 bit D/A con-

verter, pulse by pulse current limiting, integrated

power good signaling, logic compatible shutdown and

on-board over voltage protection (OVP).

The SC1151 operates at a fixed frequency of 200kHz,

providing an optimum compromise between size, effi-

ciency and cost in the intended application areas.

The integrated D/A converter provides programmabil-

ity of output voltage from 2.0V to 3.5V in 100mV in-

crements and 1.80V to 2.05V in 50mV increments with

no external components.

The SC1151 provides an OVP output which can be

used to trigger a crowbar circuit for true over voltage

protection.

APPLICATIONS

FEATURES

ORDERING INFORMATION

DEVICE

(1)

PACKAGE

TEMP RANGE (T

SC1151CS

SO-16

0° to 125°C

BLOCK DIAGRAM

VCC

VCC

ERROR

AMP

D/A AND

SHUTDOWN

LOGIC

DECODED SHUTDOWN SIGNAL

OSCILLATOR

LEVEL SHIFT

AND DRIVE

1.25V REF

+

-

+

-

CURRENT LIMIT

+

-

+

-

CSm

VID0

VID2

VID1

VID3

VOSENSE

PWRGOOD

BST

DH

VCC

SHUTDOWN

OVP

GND

PGND

R

S

Q

+

-

70mV

CSp

+

-

VID4

A17043A

PIN CONFIGURATION

1

2

3

4

5

6

7

8

16

15

14

13

12

11

10

9

PWRGOOD

VID0

VID1

VID2

VID3

BST

DH

VOSENSE

GND

SHUTDOWN

PGND

VCC

CSp

CSm

OVP

VID4

Note:

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