MP38894

4.5A, 42V, 420kHz Step-Down Converter

with Synchronizable Gate Driver

MP38894 Rev.1.0

www.MonolithicPower.com

1

9/28/2009

MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.

© 2009 MPS. All Rights Reserved.

The Future of Analog IC Technology

DESCRIPTION

The MP38894 is a monolithic step-down switch

mode converter with a built in internal power

MOSFET. It achieves 4.5A continuous output

current over a wide input supply range with

excellent load and line regulation.

Current mode operation provides fast transient

response and eases loop stabilization.

Fault condition protection includes cycle-by-cycle

current limiting and thermal shutdown.

The MP38894 requires a minimum number of

readily available standard external components

and is available in an 8-pin SOIC package with

exposed pad.

FEATURES

• Wide 4.5V to 42V Operating Input Range

• 4.5A Continuous Output Current

• ±1.5% Vfb Accuracy

• 100mΩ Internal Power MOSFET Switch

• Synchronizable Gate Driver Delivers up to

95% Efficiency

• Fixed 420kHz Frequency

• Synchronizable up to 1.5MHz

• Cycle-by-Cycle Over Current Protection with

Hiccup retry

• Thermal Shutdown

• Output Adjustable from 0.8V to 15V

• Stable with Low ESR Output Ceramic

Capacitors

• Available in a Thermally Enhanced 8-Pin

SOIC Package

APPLICATIONS

•

Digital Set Top Boxes

•

Personal Video Recorders

•

Broadband Communications

•

Flat Panel Television and Monitors

“MPS” and “The Future of Analog IC Technology” are Registered Trademarks of

Monolithic Power Systems, Inc.

TYPICAL APPLICATION

SW

BG

FB

BST

1

4

6

5

2

GND

IN

VCC

EN/SYNC

8

3

7

M2

OFF ON