MP28127

1.25A, 5.5V Synchronous

Step-Down Switching Regulator

MP28127 Rev. 0.9

www.MonolithicPower.com

1

6/7/2010

MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.

© 2010 MPS. All Rights Reserved.

The Future of Analog IC Technology

DESCRIPTION

The MP28127 is an internally compensated

1.5MHz fixed frequency PWM synchronous

step-down regulator. MP28127 operates from a

2.7V to 5.5V input and generates an output

voltage as low as 0.8V.

The MP28127 integrates a high-side switch and

a synchronous rectifier for high efficiency

without an external Schottky diode. With peak

current

mode

control

and

internal

compensation, the MP28127 based solution

delivers a very compact footprint with a

minimum component count.

The MP28127 is available in a small 3mm x

3mm 10-lead QFN package.

FEATURES

• 1.25A Output Current

• Input Operation Range: 2.7V to 5.5V

• All Ceramic Capacitor Design

• 1.5MHz Fixed Switching Frequency

• Internal Soft-Start

• Frequency Synchronization Input

• Power Good Output

• Thermal Shutdown

• Cycle-by-Cycle Current Limiting

• Hiccup Short Circuit Protection

• 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

MP28127

BS

IN

FB

SW

EN/SYNC

POK

GND

1.8V / 1.25A

1.2

2.7V to 5.5V

47

POK

OFF ON

C3

100nF

400

310

47