MP38874

8A, 21V, 600KHz Step-Down Converter

with Synchronizable Gate Driver

MP38874 Rev. 1.1

www.MonolithicPower.com

1

10/13/2010

MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.

© 2010 MPS. All Rights Reserved.

The Future of Analog IC Technology

DESCRIPTION

The MP38874 is a monolithic step-down switch

mode converter with a built in internal power

MOSFET. It achieves 8A 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 MP38874 requires a minimum number of

readily available standard external components

and is available in a space saving 3mm x 4mm

14-pin QFN package.

FEATURES

• Wide 4.5V to 21V Operating Input Range

• 8A Continuous Output Current

• 42mΩ Internal Power MOSFET Switch

• Power Good Indicator

• Synchronous Gate Driver Delivers up to

95% Efficiency

• Fixed 600KHz Frequency

• Synchronizable to >1MHz External Clock

• Cycle-by-Cycle Over Current Protection

• Thermal Shutdown

• Output Adjustable from 0.8V to 15V

• Stable with Low ESR Output Ceramic

Capacitors

• Available in a 3mm x 4mm 14-Pin QFN

Package

APPLICATIONS

•

Point of Load Regulator in Distributed

Power System

•

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

MP38874

SW

BG

FB

BST

8, 9, 10

13

1

14

11

GND

IN

VCC

EN/SYNC

POWER

GOOD

PG

4, 5, 6

12

3

2

OFF ON

100

90

80

70

12

4

5

6

7

38

OUTPUT CURRENT (A)

Efficiency vs

Output Current