MP1586

3A, 28V, 50kHz to 400kHz

Step-Down Converter

MP1586 Rev. 0.91

www.MonolithicPower.com

1

1/8/2010

MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.

© 2010 MPS. All Rights Reserved.

The Future of Analog IC Technology

DESCRIPTION

The MP1586 is a high frequency step-down

switching regulator with an integrated internal

high-side high voltage power MOSFET. It

provides 3A output with current mode control for

fast loop response and easy compensation.

The wide 4.5V to 28V input range accommodates

a variety of step-down applications, including

those in an automotive input environment. A

115µA operational quiescent 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.

The MP1586 is available in a thermally enhanced

SOIC8E package.

FEATURES

• Wide 4.5V to 28V Operating Input Range

• Programmable Switching Frequency from

50kHz to 400kHz

• High-Efficiency Pulse Skipping Mode for

Light Load

• Ceramic Capacitor Stable

• Internal Soft-Start

• Internally Set Current Limit without a

Current Sensing Resistor

• Available in SOIC8E Package.

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

C3

820pF

C6

NS

C4

100nF

D1

5V

VIN

EN

FREQ

GND

BST

SW

FB

COMP

MP1586

EN

5

8

1

4

3

7

2

6

Efficiency vs.

Load Current

40

50

60

70

80

90

100

0.01

0.1

1

10

LOAD CURRENT(A)