MP28115

4A, 1.5MHz Synchronous

Step-Down Converter

MP28115 Rev. 0.92

www.MonolithicPower.com

1

8/23/2010

MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.

© 2010 MPS. All Rights Reserved.

The Future of Analog IC Technology

DESCRIPTION

The MP28115 is an internally compensated

1.5MHz fixed frequency PWM synchronous

step-down regulator. MP28115 operates from a

2.7V to 6V input and generates an adjustable

load current.

The MP28115 integrates a 60mΩ high-side

switch and a 60mΩ synchronous rectifier for

high efficiency without an external Schottky

diode. With peak current mode control and

internal compensation, the MP28115 based

solution

achieves

minimum

footprint

and

component count. Fault condition protection

includes Hiccup short-circuit protection, cycle-

by-cycle current limiting and thermal shutdown.

Other

features

include

frequency

synchronization input, internal soft-start and

power good output.

The MP28115 is available in a small 3mm x

3mm 10-lead QFN package.

FEATURES

• 4A Output Current

• Input Operation Range: 2.7V to 6V

• 1.5% Output Accuracy

• 60mΩ Internal Power MOSFET Switches

• All Ceramic Capacitor Design

• Up to 95% Efficiency

• 1.5MHz Fixed Switching Frequency

• Internal Soft-Start

• Frequency Synchronization Input

• Power Good Output

• Cycle-by-Cycle Current Limiting

• Hiccup Short Circuit Protection

• Thermal Shutdown

• 3mm x 3mm 10-lead QFN Package

APPLICATIONS

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

• Printers and LCD TVs

• Network and Telecom Equipment

• Point of Load Regulators

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

Power Systems, Inc.

TYPICAL APPLICATION

BS

IN

POK

SW

EN/SYNC

FB

GND

MP28115

4,7

5

3,8

1

2,9

6

10

Vin

2.7V to 6V

Vout

1.8V/4A

C3

47uF

R1

400k

R2

316k

L1

1uH

C4

100nF

C2

10uF

R3

100k

R4

100k

C1

10uF

D1

B0530

Efficiency vs

Output Current

0

70

75

85

90

95

80

1234

OUTPUT CURRENT (A)

5V to 2.5V

5V to 1.8V

5V to 3.3V