SC1157CS.TR Semtech Corporation, SC1157CS.TR Datasheet

SC1157CS.TR

Manufacturer Part Number

SC1157CS.TR

Description

PROGRAMMABLE SYNCHRONOUS DC/DC CONTROLLER FOR ADVANCED PROCESSORS

Manufacturer

Semtech Corporation

Datasheet

1.SC1157CS.TR.pdf (5 pages)

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Bonase Electronics (HK) Co., Limited

Part Number:

SC1157CS.TR

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Preliminary - August 7, 2000

DESCRIPTION

The SC1157 is a low-cost, full featured, synchronous

voltage-mode controller designed for use in single

ended power supply applications where efficiency is of

primary concern. Synchronous operation allows for the

elimination of heat sinks in many applications. The

SC1157 is ideal for implementing DC/DC converters

needed to power advanced microprocessors such as

Pentium

cessor configurations. Internal level-shift, high-side

drive circuitry, and preset shoot-thru control, allows for

use of inexpensive n-channel power switches.

SC1157 features include an integrated 4-bit V

temperature compensated voltage reference, triangle

wave oscillator, current limit comparator, frequency

shift over-current protection, and an internally compen-

sated error amplifier.

The SC1157 operates at a fixed 140KHz, providing an

optimum compromise between efficiency, external

component size, and cost.

PIN CONFIGURATION

ll (Klamath), in both single and multiple pro-

(16-Pin SOIC)

Top View

PROGRAMMABLE SYNCHRONOUS DC/DC

CONTROLLER FOR ADVANCED PROCESSORS

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

VOSENSE

DAC,

VID3

VID2

VID1

VID0

GND

REF

D/A

FEATURES

APPLICATIONS

ORDERING INFORMATION

Note:

(1) Only available in tape and reel packaging. A reel

contains 2500 devices.

(2) “NB” indicates 150 MIL body.

BLOCK DIAGRAM

SC1157CS.TR

652 MITCHELL ROAD NEWBURY PARK CA 91320

DEVICE

Low cost / full featured

Synchronous operation

4 Bit V

(1% tolerance)

Designed to meet Intel VRM8.2 (Pentium

1.5% Reference

Pentium® II Core Supply

Multiple Microprocessor Supplies

Voltage Regulator Modules (VRM)

Programmable Power Supplies

High Efficiency DC/DC Conversion

VCC

ERROR

AMP

CS-

OSCILLATOR

(1)

DAC programmable output

70mV

CS+

Pentium is a registered trademark of Intel Corporation

PACKAGE

CURRENT

LIMIT

SO-16NB

SHUTDOWN

(2)

TEMP. RANGE (T

LEVEL SHIFT AND

HIGH SIDE DRIVE

SYNCHRONOUS

MOSFET DRIVE

SHOOT-THRU

CONTROL

0 - 125°C

SC1157

II)

BSTH

BSTL

PGND

)

Related parts for SC1157CS.TR

SC1157CS.TR Summary of contents

Page 1

... Multiple Microprocessor Supplies = Voltage Regulator Modules (VRM) = DAC, Programmable Power Supplies ID = High Efficiency DC/DC Conversion ORDERING INFORMATION (1) DEVICE PACKAGE SC1157CS.TR Note: (1) Only available in tape and reel packaging. A reel contains 2500 devices. (2) “NB” indicates 150 MIL body. BLOCK DIAGRAM VCC CS- CS+ REF REF 70mV + ...

Page 2

Preliminary - August 7, 2000 ABSOLUTE MAXIMUM RATINGS Parameter V to GND CC PGND to GND BST to GND Thermal Resistance Junction to Case Thermal Resistance Junction to Ambient Operating Temperature Range Storage Temperature Range Lead Temperature (Soldering) 10 sec ...

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SC1157CS.TR Semtech Corporation, SC1157CS.TR Datasheet

SC1157CS.TR

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Related parts for SC1157CS.TR

SC1157CS.TR Summary of contents

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