MP8715

100% Duty Cycle Synchronous

4A, 21V, 500kHz Step-Down Converter

MP8715 Rev. 1.01

www.MonolithicPower.com

1

6/13/2013

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

© 2013 MPS. All Rights Reserved.

The Future of Analog IC Technology

DESCRIPTION

The MP8715 is a 500 kHz fixed-frequency

PWM

synchronous

step-down

regulator.

MP8715 operates from a 4.5V to 21V input and

with 100% duty cycle operation.

The MP8715 integrates a 120mΩ high-side

switch and a 50mΩ synchronous rectifier for

high efficiency without an external Schottky

diode. It offers a very compact solution to

achieve 4A continuous output current over a

wide input supply range with excellent load and

line regulation.

External soft start and power good indication

meet flexible design requirement.

The MP8715 is available in a space saving 8-

pin SOIC package with an exposed pad and

3mmx4mm 14-pin QFN package.

FEATURES

• 4A Output Current

• Wide 4.5V to 21V Input Operation Range

• 100% Duty Cycle Support

• 120mΩ/50mΩ Internal Power MOSFET

• All Ceramic Capacitor Design

• Up to 95% Efficiency

• 500kHz Fixed Switching Frequency

• Adjustable Output from 0.8V to Vin

• External Soft-Start

• Frequency Synchronization Input

• Power OK Indicator

• Internal Compensation

• Over Current Hiccup and Thermal Protection

Exposed Pad and 14-pin QFN3x4 package

APPLICATIONS

• Cable eMTAs

• µP/ASIC/DSP/FPGA Core and I/O Supplies

• Printers and LCD TVs

• Digital Set Top Boxes

• Network and Telecom Equipment

• Point of Load Regulators

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

4

2

6

R2

10k

MP8715

SW

GND

FB

EN/SYNC

BST

VCC

SS

4.5V-21V

1.2V/4A

C3

100nF

R1

4.99k

Rt

47k

C5

10nF

VIN

VIN

VOUT

ON/OFF

8

1

3

7

5

9

POK

POK

SOIC8E Package

Efficiency

OUTPUT CURRENT (A)

50

55

60

65

70

75

80

85

90

95

0 0.5 1 1.5

2 2.5 3 3.5

4