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600kHz, 2A Step-Down

Switching Regulator

POWER MANAGEMENT

Description

The SC4518H is a current mode switching regulator with

an integrated switch, operating at 600kHz with separate

sync and enable functions. The integrated switch allows

for cost effective low power solutions (peak switch current

2 amps). The sync function allows customers to

synchronize to a faster clock in order to avoid frequency

beating in noise sensitive applications. High frequency

of 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 SC4518H is a 600kHz switching regulator

synchronizable to a faster frequency from 750kHz to

1.2MHz.

SC4518H

Features

Wide operating voltage range: 4.4V to 24V

Integrated 2 Amp switch

600kHz frequency of operation

Current mode controller

Synchronizable to higher frequency up to 1.2MHz

Precision enable threshold

SO-8 EDP package. Lead free product, fully WEEE

and RoHS compliant

Applications

XDSL modems

CPE equipment

DC-DC point of load applications

Portable equipment

Typical Application Circuit

D1

1

VIN

Enable

C3

2

5

8

BST

IN

SW

3

6

7

C1

L1

VOUT

R1

SC4518H

EN

SYNC

FB

COMP

GND

4

D2

R2

C2

C4

R3

Revision: August 22, 2007

1

www.semtech.com

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