SC1150

© 1998 SEMTECH CORP.

652 MITCHELL ROAD NEWBURY PARK CA

PROGRAMMABLE DC/DC

CONTROLLER

March 11, 1998

1

Pentium is a registered trademark of Intel Corporation

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

DESCRIPTION

The SC1150 voltage mode controller contains most of

the circuitry necessary to implement a DC/DC converter

for powering the Intel Pentium

both in single and multiple processor configurations.

The SC1150 features an integrated D/A converter,

pulse by pulse current limiting, integrated power good

signaling, logic compatible shutdown and on-board over

voltage protection (OVP).

The SC1150 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 programmability

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

ments with no external components. Both the range

and the increment value may be changed by adding ex-

ternal components.

The SC1150 provides an OVP output which can be

used to trigger a crowbar circuit for true over voltage

protection.

FEATURES

APPLICATIONS

BLOCK DIAGRAM

VCC

VCC

1.00V to

1.75V

ERROR

AMP

OSCILLATOR

LEVEL SHIFT

AND DRIVE

1.25V REF

D/A

+

-

+

-

CURRENT LIMIT

+

-

+

-

CSm

VID0

VID2

VID1

VID3

VOSENSE

PWRGOOD

BST

DH

VCC

SHUTDOWN

OVP

GND

FB

PGND

R

S

Q

+

-

70mV

CSp

+

-

B16997B

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

FB

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

ORDERING INFORMATION

DEVICE

(1)

PACKAGE

TEMP RANGE (T

SC1150CS

SO-16

0 - 125°C

Note:

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