MP4559

1.5A, 2MHz, 55V

Step-Down Converter

MP4559 Rev. 1.01

www.MonolithicPower.com

1

12/23/2013

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

© 2013 MPS. All Rights Reserved.

The Future of Analog IC Technology

DESCRIPTION

The MP4559 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 MP4559 is able to

prevent EMI (Electromagnetic Interference) noise

problems, such as those found in AM radio and

ADSL applications.

The MP4559 is available in small 3mm x 3mm

QFN10 and SOIC8 with exposed pad packages.

FEATURES

 Wide 3.8V to 55V Operating Input Range

 250mΩ Internal Power MOSFET

 Up to 2MHz Programmable Switching

Frequency

 140μA Quiescent Current

 Ceramic Capacitor Stable

 Internal Soft-Start

 Up to 95% Efficiency

 Output Adjustable from 0.8V to 52V

 Available in QFN (3mm x 3mm) and

SOIC8E with Exposed Pad Packages

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 the 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

0

10

20

30

40

50

60

70

80

90

100

OUTPUT CURRENT (A)

fs=500kHz

0

0.5

1

1.5

Vin=12V

Vin=55V