MP8642

Dual 3A, 23V, 600kHz Step-Down Converter

with Frequency Synchronization

MP8642 Rev. 1.0

www.MonolithicPower.com

1

9/13/2012

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

© 2012 MPS. All Rights Reserved.

The Future of Analog IC Technology

DESCRIPTION

The MP8642 is a dual monolithic step-down

switch mode converter with built-in internal

power MOSFETs. It achieves 3A continuous

output current for each output 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 MP8642 requires a minimum number of

readily available standard external components.

FEATURES

 3A Current for Each Output

 80mΩ Internal Power MOSFET Switch

 Stable with Low ESR Output Ceramic

Capacitors

 Up to 95% Efficiency

 Power Good Indicator

 Fixed 600kHz Frequency

 Synchronizable to >1MHz External Clock

 Thermal Shutdown

 Cycle-by-Cycle Over Current Protection

 Wide 4.5V to 23V Operating Input Range

 Each Output Adjustable from 0.8V to 20V

 Available in a 5mm x 5mm 32-Pin QFN

Package

APPLICATIONS

 Point of Load Regulator in Distributed

Power Systems

 Digital Set Top Boxes

 Personal Video Recorders

 Broadband Communications

 Flat Panel Television and Monitors

All MPS parts are lead-free and adhere to the RoHS directive. For MPS green

status, please visit MPS website under Products, Quality Assurance page.

“MPS” and “The Future of Analog IC Technology” are registered trademarks of

Monolithic Power Systems, Inc.

TYPICAL APPLICATION

MP8642

25,26,27

14

17

18

15

19

12,13

8

16

GND1 GND2

BST1

IN1

IN2

SW1

BG1

FB1

PG1

VCC1

EN/SYNC1

BST2

SW2

BG2

FB2

PG2

VCC2

EN/SYNC2

5

29,30,31

21,22,23,24

1,2,3,4

7

10

6

9

11

2.5V@3A

M3

OFF ON

M2

ON OFF