MP2305

2A, 23V Synchronous Rectified

Step-Down Converter

MP2305 Rev. 1.7

www.MonolithicPower.com

1

4/17/2006

MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.

© 2006 MPS. All Rights Reserved.

The Future of Analog IC Technology

TM

TM

DESCRIPTION

The MP2305 is a monolithic synchronous buck

regulator.

The

device

integrates

130mΩ

MOSFETS that provide 2A 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

EV2305DS-00A

2.0”X x 1.5”Y x 0.5”Z

FEATURES

• 2A Output Current

• Wide 4.75V to 23V Operating Input Range

• Integrated 130mΩ Power MOSFET Switches

• Output Adjustable from 0.923V to 20V

• Up to 93% 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

2A

C3

3.3nF

C5

10nF

MP2305

BS

IN

FB

SW

SS

GND

COMP

EN

1

2

3

5

6

4

8

7

MP2305-TAC01

100

95

90

85

80

75

70

65

60

55

50

0

1.0

2.0

2.5

1.5

0.5

LOAD CURRENT (A)

MP2305-EC01

Efficiency vs

Load Current