MP38872

6A, 21V, 600kHz Step-Down Converter

with Synchronizable Gate Driver

MP38872 Rev.1.11

www.MonolithicPower.com

1

9/21/2011

MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.

© 2011 MPS. All Rights Reserved.

The Future of Analog IC Technology

DESCRIPTION

The MP38872 is a monolithic step-down switch

mode converter with a built in high-side internal

power MOSFET and a gate driver for a low-side

external MOSFET. It achieves 6A continuous

output current over a wide input supply range

with excellent load and line regulation.

Current mode operation provides fast transient

response and reliable over-current protection.

The MP38872 requires a minimum number of

readily available standard external components

and is available in a 14-pin QFN 3x4 package

with exposed pad.

FEATURES

• Wide 4.5V to 21V Operating Input Range

• 6A Output Current

• 45mΩ Internal Power MOSFET Switch

• Power Good Indicator

• Synchronizable 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

• Stable with Low ESR Output Ceramic

Capacitors

• Available in a Thermally Enhanced 14-Pin

QFN 3x4 Package

APPLICATIONS

•

Point of Load Regulator in Distributed

Power System

•

Digital Set Top Boxes

•

Personal Video Recorders

•

Broadband Communications

•

Flat Panel Television and Monitors

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

Monolithic Power Systems, Inc.

TYPICAL APPLICATION

MP38872

SW

BG

FB

BST

8, 9, 10

13

1

14

11

GND

IN

VCC

PG

EN/SYNC

4, 5, 6

12

3

3.3V

C4

1uF

16V

M2

2

Power Good

OFF ON

C1

22uF

25V

C3

1uF

16V

L1

2.2uH

R1

40.2k

Ω

R3

100k

Ω

R2

13k

Ω

C2

100uF

6.3V

100

95

90

85

80

75

70

65

60

55

50

0123456

OUTPUT CURRENT (A)

Efficiency vs

Output Current