MP38870

3A, 14V, 600KHz Step-Down Converter

with Synchronizable Gate Driver

MP38870 Rev. 1.1

www.MonolithicPower.com

1

10/22/2009

MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.

© 2009 MPS. All Rights Reserved.

The Future of Analog IC Technology

DESCRIPTION

The MP38870 is a monolithic step-down switch

mode converter with a built in internal high-side

power MOSFET. It achieves 3A 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.

Fault condition protection includes cycle-by-cycle

current limiting and thermal shutdown.

The MP38870 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 14V Operating Input Range

• 3A Continuous Output Current

• 80mΩ Internal Power MOSFET Switch

• Power Good Indicator

• Synchronous Gate Driver Delivers up to

95% Efficiency

• Fixed 600KHz Frequency

• External Synchronous Option: 250kHz-

1.5MHz

• Cycle-by-Cycle Over Current Protection

• Thermal Shutdown

• Output Adjustable from 0.8V

• 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

SW

BG

FB

BST

8, 9, 10

13

1

14

11

GND

IN

VCC

EN/SYNC

3.3V @ 3A

PG

4, 5, 6

12

3

2

OFF ON

70

65

60

75

80

85

90

95

100

OUTPUT CURRENT (A)

Efficiency vs.

Output Current

012

3

4