MP2355

3A, 23V, 380KHz

Step-Down Converter

MP2355 Rev. 1.4

www.MonolithicPower.com

1

1/6/2006

MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.

© 2006 MPS. All Rights Reserved.

The Future of Analog IC Technology

TM

TM

DESCRIPTION

The MP2355 is a step-down regulator with a

built in internal Power MOSFET. It achieves 3A

continuous output current over a wide input

supply range with excellent load and line

regulation.

Current mode operation provides fast transient

response and eases loop stabilization. Fault

condition

protection

includes

cycle-by-cycle

current limiting and thermal shutdown. Adjustable

soft-start reduces the stress on the input source

at turn-on. In shutdown mode the regulator draws

20µA of supply current.

The MP2355 uses a minimum number of

readily

available

external

components

to

complete a 3A step-down DC to DC converter

solution.

EVALUATION BOARD REFERENCE

Board Number

Dimensions

EV2355DN-00A

2.0”X x 1.3”Y x 0.5”Z

FEATURES

• Programmable Soft-Start

• 100mΩ Internal Power MOSFET Switch

• Stable with Low ESR Output Ceramic

Capacitors

• Up to 95% Efficiency

• 20µA Shutdown Mode

• 3A Output Current

• Wide 4.75V to 23V Operating Input Range

• Fixed 380KHz Frequency

• Thermal Shutdown

• Cycle-by-Cycle Over Current Protection

• Under Voltage Lockout

APPLICATIONS

• Distributed Power Systems

• Battery Chargers

• Pre-Regulator for Linear Regulators

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

Power Systems, Inc.

TYPICAL APPLICATION

MP2355

LX

VIN

BST

FB

7

5

32

4

6

1

8

SS

COMP

GND

RUN

OUTPUT

3.3V / 3A

INPUT

4.75V to 23V

OPEN

AUTOMATIC

STARTUP

MP2355_TAC_S01

10nF

4.7nF

10nF

D1

B330A

95

90

85

80

75

70

65

60

LOAD CURRENT (mA)

MP2355_EC01

Efficiency vs

Load Current

0

1500

1000

500

2000

3500

3000

2500