MP2403

3A, 32V, 250kHz Integrated Synchronous

Step-Down Converter

MP2403 Rev.1.0

www.MonolithicPower.com

1

4/20/2010

MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.

© 2010 MPS. All Rights Reserved.

The Future of Analog IC Technology

DESCRIPTION

The MP2403 is a monolithic synchronous buck

regulator. The device integrates a 150mΩ

high-side MOSFET and an 80mΩ low-side

MOSFET that provides 3A continuous load

current over a wide operating input voltage of

4.6V to 32V. Current mode control provides fast

transient response and cycle-by-cycle current

limit.

An adjustable soft-start prevents inrush current

at turn-on. In shutdown mode, the supply

current drops to 1μA.

This device, available in an 8-pin SOIC

package, provides a very compact system

solution with minimal reliance on external

components.

EVALUATION BOARD REFERENCE

Board Number

Dimensions

EV2403DN-00A

2.0”X x 1.5”Y x 0.5”Z

FEATURES

• 3A Output Current

• Wide 4.6V to 32V Operating Input Range

• Integrated MOSFET Switches

• Output Adjustable from 0.80V to 28V

• Up to 95% Efficiency

• Programmable Soft-Start

• Stable with Low ESR Ceramic Output Capacitors

• Fixed 250kHz Frequency

• Cycle-by-Cycle Over Current Protection

• Input Under Voltage Lockout

• Thermally Enhanced 8-Pin SOIC Package

APPLICATIONS

• Distributed Power Systems

• Pre-Regulator for Linear Regulators

• Notebook Computers

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

Monolithic Power Systems, Inc.

TYPICAL APPLICATION

INPUT

4.6V to 32V

OFF

ON

OUTPUT

3.3V

3A

MP2403

BS

IN

1

2

3

5

6

4

8

7

FB

SW

SS

GND

COMP

EN

100

90

80

70

60

50

40

30

20

10

0

01

2

3

Efficiency vs

Output Current

OUTPUT CURRENT(A)