MP2309

1A, 23V, 340KHz Synchronous Rectified

Step-Down Converter

MP2309 Rev. 1.4

www.MonolithicPower.com

1

3/13/2006

MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.

© 2006 MPS. All Rights Reserved.

The Future of Analog IC Technology

TM

TM

DESCRIPTION

The MP2309 is a monolithic synchronous buck

regulator.

The

device

integrates

140mΩ

MOSFETS that provide 1A continuous load

current over a wide operating input voltage of

4.75V to 23V. Current mode control provides

fast transient response and cycle-by-cycle

current limit.

An adjustable soft-start prevents inrush current

at turn-on. Shutdown mode drops the supply

current 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

EV2309DS-00A

2.0”X x 1.5”Y x 0.5”Z

FEATURES

• 1A Output Current

• Wide 4.75V to 23V Operating Input Range

• Integrated 140mΩ Power MOSFET Switches

• Output Adjustable from 0.923V to 20V

• Up to 95% Efficiency

• Programmable Soft-Start

• Stable with Low ESR Ceramic Output Capacitors

• Fixed 340KHz Frequency

• Cycle-by-Cycle Over Current Protection

• Input Under Voltage Lockout

APPLICATIONS

• Distributed Power Systems

• Networking Systems

• FPGA, DSP, ASIC Power Supplies

• Green Electronics/ Appliances

• Notebook Computers

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

Power Systems, Inc.

TYPICAL APPLICATION

INPUT

4.75V to 23V

OUTPUT

3.3V

1A

C3

3.3nF

C5

10nF

1%

MP2309

BS

21

3

5

6

4

8

7

IN

FB

SW

SS

GND

COMP

EN

MP2309-TAC01

100

90

80

70

60

50

40

30

20

0

0.5

1.0

0.75

0.25

LOAD CURRENT (A)

MP2309-EC01

Efficiency vs

Load Current