MP2565

2.5A, 4MHz, 50V

Step-Down Converter

MP2565 Rev. 0.91

www.MonolithicPower.com

1

4/19/2011

MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.

© 2011 MPS. All Rights Reserved.

The Future of Analog IC Technology

DESCRIPTION

The MP2565 is a high frequency step-down

switching regulator with an integrated internal

high-side high voltage power MOSFET. It

provides 2.5A output with current mode control for

fast loop response and easy compensation.

The wide 4.5V to 50V input range accommodates

a variety of step-down applications, including

those in an automotive input environment. A 12µA

shutdown mode supply current allows use in

battery-powered applications.

High power conversion efficiency over a wide

load range is achieved by scaling down the

switching frequency at light load condition to

reduce the switching and gate driving losses.

The frequency foldback helps prevent inductor

current runaway during startup and thermal

shutdown

provides

reliable,

fault

tolerant

operation.

By switching at 4MHz, the MP2565 is able to

prevent EMI (Electromagnetic Interference) noise

problems, such as those found in AM radio and

ADSL applications.

The MP2565 is available in small 3mm x 3mm

QFN10

and

thermally

enhanced

SOIC8

packages.

FEATURES

• 120µA Quiescent Current

• Wide 4.5V to 50V Operating Input Range

• 220mΩ Internal Power MOSFET

• Up to 4MHz Programmable Switching

Frequency

• High-Efficiency, Light-Load operation

• Stable with Ceramic Capacitor

• Internal Soft-Start

• Internally Set Current Limit without external

Current Sensing Resistor

• Up to 95% Efficiency

• Output Adjustable from 0.8V to 47V

• Available in 3x3 QFN10 and Thermally

Enhanced SOIC8 Packages

APPLICATIONS

• High Voltage Power Conversion

• Automotive Systems

• Industrial Power Systems

• Distributed Power Systems

• Battery Powered Systems

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

Monolithic Power Systems, Inc.

TYPICAL APPLICATION

C1

10uF

C3

220pF

C6

NS

R2

R1

L1

C4

100nF

C2

22uF

D1

3.3V

VIN

EN

FREQ

GND

BST

SW

FB

COMP

MP2565

EN

R5

R4

R3

R6

6

10

1,2

5

4

8,9

3

7

0

0.5

1

1.5

2

2.5

40

50

60

70

80

90

100

fs=500kHz