MP8718

High Efficiency 4A, 21V, 500kHz

Synchronous Step-down Converter

MP8718 Rev. 0.9

www.MonolithicPower.com

1

2/9/2010

MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.

© 2010 MPS. All Rights Reserved.

The Future of Analog IC Technology

DESCRIPTION

The MP8718 is a high frequency synchronous

rectified step-down switch mode converter with

built in internal power MOSFETs. It offers a

very compact solution to achieve 4A continuous

output current over a wide input supply range

with excellent load and line regulation. The

MP8718 has synchronous mode operation for

higher efficiency over output current load range.

Current mode operation provides fast transient

response and eases loop stabilization.

Full protection features include OCP and

thermal shut down.

The MP8718 requires a minimum number of

readily available standard external components

and is available in a space saving 8-pin SOIC

package with an exposed pad.

FEATURES

• Wide 4.5V to 21V Operating Input Range

• 4A Output Current

• Low Rds(on) Internal Power MOSFETs

• Proprietary

Switching

Loss

Reduction

Technique

• High Efficiency Synchronous Mode Operation

• Fixed 500kHz Switching Frequency

• Sync from 300kHz to 2MHz External Clock

• 1.5ms Internal Soft-Start

• Internal Compensation

• OCP Protection and Hiccup

• Thermal Shutdown

• Output Adjustable from 0.8V

• Available in a Thermally Enhanced 8-pin SOIC

package

APPLICATIONS

•

Notebook Systems and I/O Power

•

Networking Systems

•

Digital Set Top Boxes

•

Personal Video Recorders

•

Flat Panel Television and Monitors

•

Distributed Power Systems

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

Monolithic Power Systems, Inc.

The information in this datasheet about the product and its associated

technologies are proprietary and intellectual property of Monolithic Power

Systems and are protected by copyright and pending patent applications

TYPICAL APPLICATION

MP8718

SW

GND

FB

EN/SYNC

IN

BST

VCC

R2

10k

Rt

47k

R1

4.99k

VIN

VOUT 1.2V

ON/OFF

6

8

4

2,3

1

7

5

21

Efficiency

0

OUTPUT CURRENT (A)

0

10

20

30

40

50

60

70

80

90

100

12

3

4