SC1101

© 2000 SEMTECH CORP.

652 MITCHELL ROAD NEWBURY PARK CA 91320

VOLTAGE MODE PWM CONTROLLER

February 29, 2000

1

BLOCK DIAGRAM

Pentium is a registered trademark of Intel Corporation

PIN CONFIGURATION

1

2

3

4

5

6

7

8

BST

DH

GND

GND

Vcc

Cs(+)

Cs(-)

FB

Top View

(8 LEAD PLASTIC SOIC)

DESCRIPTION

The SC1101 is a versatile, low-cost, voltage-mode

PWM controller designed for use in single ended DC/

DC power supply applications. A simple, fixed-voltage

buck regulator can be implemented using the SC1101

with a minimum of external components. Internal level

shift and drive circuitry eliminates the need for an ex-

pensive p-channel, high-side switch. The small device

footprint allows for compact circuit design.

SC1101 features include a temperature compensated

voltage reference, triangle wave oscillator, current limit

comparator, frequency shift over-current protection,

and an internally compensated error amplifier. Pulse by

pulse current limiting is implemented by sensing the

differential voltage across an external resistor, or an

appropriately sized PC board trace.

The SC1101 operates at a fixed frequency of 200kHz,

providing an optimum compromise between efficiency,

external component size, and cost.

FEATURES

APPLICATIONS

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

ORDERING INFORMATION

DEVICE

(1)

PACKAGE

TEMP RANGE (T

SC1101CS

SO-8

0° to 125°C

Note:

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