MP2351

1.5A, 23V, 1.4MHz

Step-Down Converter

MP2351 Rev. 1.5

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 MP2351 is a monolithic step down switch

mode converter with a built in internal power

MOSFET. It achieves 1.5A 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, short circuit frequency foldback

and thermal shutdown. In shutdown mode the

regulator draws 20µA of supply current.

The MP2351 requires a minimum number of

readily available standard external components.

EVALUATION BOARD REFERENCE

Board Number

Dimensions

EV2351DQ-00A

2.3”X x 1.5”Y x 0.5”Z

FEATURES

• 1.5A Output Current

• 0.18Ω Internal Power MOSFET Switch

• Stable with Low ESR Output Ceramic

Capacitors

• Up to 93% Efficiency

• 20µA Shutdown Mode

• Fixed 1.4MHz Frequency

• Thermal Shutdown

• Cycle-by-Cycle Over Current Protection

• Wide 4.75V to 23V Operating Input Range

• Output Adjustable from 1.23V to 16V

• Programmable Under Voltage Lockout

• Frequency Synchronization Input

• Available in QFN (3mm x 3mm) and tiny

10-Pin MSOP Packages

• Evaluation Board Available

APPLICATIONS

• Distributed Power Systems

• Battery Charger

• DSL Modems

• Pre-Regulator for Linear Regulators

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

Power Systems, Inc.

TYPICAL APPLICATION

MP2351

SW

IN

BS

4

2

5

7

8

6

10

9

FB

SYNC

COMP

GND

EN

3.3V/1.5A

INPUT

4.75V - 23V

OPEN

NOT USED

OPEN

AUTOMATIC

STARTUP

MP2351_TAC_S01

C5

10nF

C3

1nF

C6

OPEN

D1

B220A

100

90

80

70

60

50

40

0

1500

300

600

900

1200

LOAD CURRENT (mA)

MP2351-EC01

Efficiency vs

Load Current