MP4561

1.5A, 2MHz, 55V

Step-Down Converter

MP4561 Rev. 1.0

www.MonolithicPower.com

1

11/5/2012

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

© 2012 MPS. All Rights Reserved.

The Future of Analog IC Technology

DESCRIPTION

The MP4561 is a high frequency step-down

switching regulator with integrated internal high-

side high voltage power MOSFET. It provides

1.5A output with current mode control for fast loop

response and easy compensation.

The wide 3.8V to 55V input range accommodates

a variety of step-down applications, including

those in 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 2MHz, the MP4561 is able to

prevent EMI (Electromagnetic Interference) noise

problems, such as those found in AM radio and

ADSL applications.

The MP4561 is available in small 3mm x 3mm

10-pin QFN with exposed pad package.

FEATURES

• Wide 3.8V to 55V Operating Input Range

• 300mΩ Internal Power MOSFET

• Up to 2MHz Programmable Switching

Frequency

• 140μA Quiescent Current

• Ceramic Capacitor Stable

• External Soft-Start

• Up to 95% Efficiency

• Output Adjustable from 0.8V to 52V

• Available in 3x3mm 10-Pin QFN

APPLICATIONS

• High Voltage Power Conversion

• Automotive Systems

• Industrial Power Systems

• Distributed Power Systems

• Battery Powered Systems

All MPS parts are lead-free and adhere to the RoHS directive. For MPS green

status, please visit MPS website under Quality Assurance. “MPS” and “The

Future of Analog IC Technology” are Registered Trademarks of Monolithic

Power Systems, Inc.

TYPICAL APPLICATION

C1

10uF

100V

C3

470pF

C6

NS

L1

10uH

C4

100nF

C2

22uF

6.3V

D1

3.3V

VIN

EN

FREQ

GND

BST

SW

FB

COMP

MP4561

EN

6

10

1.2

5

4

9

3

7

C5

10nF

8

SS

C7

NS

0

0.5

1

1.5

40

50

60

70

80

90

100