MP8666

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

with Synchronizable Gate Driver

MP8666 Rev. 1.21

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 MP8666 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 eases loop stabilization.

Fault condition protection includes cycle-by-cycle

current limiting and thermal shutdown.

The MP8666 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 21V Operating Input Range

• 6A Continuous Output Current

• 45mΩ Internal Power MOSFET Switch

• Synchronizable Gate Driver Delivers up to

95% Efficiency

• Fixed 600KHz Frequency

• Synchronizable up to 1.5MHz

• Cycle-by-Cycle Over Current Protection with

Hiccup

• Thermal Shutdown

• Output Adjustable from 0.8V

• Stable with Low ESR Output Ceramic

Capacitors

• Available in a Thermally Enhanced 8-Pin

SOIC 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

MP8666

SW

BG

FB

BST

1

4

6

5

2

GND

IN

VCC

EN/SYNC

8

3

7

3.3V

C4

100nF

16V

M2

OFF ON

Efficiency vs

Output Current

100

95

90

85

80

75

70

65

60

55

50

12

4

5

36

OUTPUT CURRENT (A)