SC1173 Semtech Corporation, SC1173 Datasheet

SC1173

Manufacturer Part Number

SC1173

Description

PROGRAMMABLE SYNCHRONOUS DC/DC CONVERTER WITH LOW DROPOUT REGULATOR CONTROLLER

Manufacturer

Semtech Corporation

Datasheet

1.SC1173.pdf (12 pages)

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October 25, 1999

DESCRIPTION

The SC1172/3 combines a synchronous voltage mode

controller with a low-dropout linear regulator providing

most of the circuitry necessary to implement two DC/DC

converters for powering advanced microprocessors such

as Pentium

The SC1172/3 switching section features an integrated 5

bit D/A converter, pulse by pulse current limiting,

integrated power good signaling, and logic compatible

shutdown. The SC1172/3 switching section operates at

a fixed frequency of 200kHz, providing an optimum

compromise between size, efficiency and cost in the

intended application areas. The integrated D/A con-

verter provides programmability of output voltage from

2.0V to 3.5V in 100mV increments and 1.30V to 2.05V

in 50mV increments with no external components.

The SC1172/3 linear section is a high performance

positive voltage regulator design for either the GTL bus

supply at 1.5V (SC1172) or an adjustable output

(SC1173).

The output of the linear regulator can provide up to 5A or

more with the appropriate external MOSFET.

PIN CONFIGURATION

PWRGOOD

PGNDH

PGNDL

AGND

LDOS

VCC

OVP

CS+

CS-

II (Klamath) or Deschutes.

(24 Pin SOIC)

Top View

GATE

LDOV

VID0

VID1

VID2

VID3

VID4

VOSENSE

BSTH

BSTL

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

PROGRAMMABLE SYNCHRONOUS DC/DC

CONVERTER WITH LOW DROPOUT

REGULATOR CONTROLLER

BLOCK DIAGRAM

PWRGOOD

VOSENSE

VID4

VID3

VID2

VID1

VID0

OVP

VCC

OPEN

COLLECTORS

1.25 REF

D/A &

SHUT-

DOWN

LOGIC

FEATURES

APPLICATIONS

ORDERING INFORMATION

Part Number

SC1172CSW

SC1173CSW

Note:

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

VCC

652 MITCHELL ROAD NEWBURY PARK CA 91320

AGND

Synchronous design, enables no heatsink solution

95% efficiency (switching section)

5 bit DAC for output programmability

On chip power good function

Designed for Intel Pentium

ments

1.5V or Adj. @ 1% for linear section

Pentium

Flexible motherboards

1.3V to 3.5V microprocessor supplies

Programmable dual power supplies

CS-

70mV

CS+

OSCILLATOR

AMP

ERROR

1.25V

LDOV

REF

CURRENT LIMIT

(1)

ll or Deschutes microprocessor supplies

Pentium is a registered trademark of Intel Corporation

Package

SO-24

CONTROLLER

FET

Voltage

Linear

1.5V

II VRM8.1 require-

Adj.

GATE

MOSFET DRIVER

SYNCHRONOUS

AND HIGH SIDE

MOSFET DRIVE

LEVEL SHIFT

CONTROL

LDOS

SHOOT-

THRU

SC1172/3

0° to 125°C

Range (T

Temp.

BSTH

PGNDH

BSTL

PGNDL

)

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