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3A Step-Down Switching Regulator

with Programmable Soft Start

POWER MANAGEMENT

Description

The SC4521 is a current mode switching regulator with

an integrated switch, operating at 600kHz with

programmable soft start and enable functions. The

integrated switch allows for cost effective low power

solutions (peak switch current 3 amps). High frequency

operation allows for very small passive components.

Current mode operation allows for fast dynamic response

and instantaneous duty cycle adjustment as the input

varies (ideal for CPE applications where the input is a

wall plug power).

The low shutdown current makes it ideal for portable

applications where battery life is important.

The SC4521 is an 600kHz switching regulator with a low

pin count.

The SC4521 allows customers to use large capacitive

loads because its programmable soft start limits the dv/

dt of the output at start up.

SC4521

Features

Wide operating voltage range: 4.4V to 24V

Integrated 3 Amp switch

600kHz frequency of operation

Programmable soft start funchion

Current mode control

Precision enable threshold

SO-8 EDP Lead-free package, fully WEEE and RoHS

compliant

Applications

XDSL modems

CPE equipment

DC-DC point of load applications

Portable equipment

Digtial consumer electronics

Typical Application Circuit

D1

1

V

IN

Enable

C3

2

5

8

BST

IN

EN

SS

SW

3

6

C1

L1

V

OUT

SC4521

GND

4

FB

COMP

R1

7

D2

R2

C2

C6

C4

R3

Revision: October 5, 2007

1

www.semtech.com

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