MP1423 データシートの表示（PDF） - Monolithic Power Systems

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MP1423

3A, 23V, 385KHz Step-Down Converter

Monolithic Power Systems 

TM

The Future of Analog IC Technology TM

DESCRIPTION

The MP1423 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 MP1423 requires a minimum number of

readily available external components to

complete a 3A step-down DC to DC converter

solution.

MP1423

3A, 23V, 385KHz

Step-Down Converter

FEATURES

• 3A Output Current

• Programmable Soft-Start

• 110mΩ Internal Power MOSFET Switch

• Stable with Low ESR Output Ceramic Capacitors

• Up to 94% Efficiency

• 20µA Shutdown Mode

• Fixed 385KHz Frequency

• Thermal Shutdown

• Cycle-by-Cycle Over Current Protection

• Wide 6V to 23V Operating Input Range

• Output is Adjustable From 1.22V to 21V

• 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

INPUT

6V to 23V

OPEN =

AUTOMATIC

STARTUP

2

1 10nF

7

IN

EN

BS 3

SW

MP1423

SS

8 GND

FB

COMP 5

4

6 B330A

10nF

OPEN

5.6nF

OUTPUT

2.5V

3A

MP1423_TAC01

Efficiency vs Load Current

100

VOUT=5.0V

90

80

VOUT=2.5V

70

VOUT=3.3V

60

50

0

VIN = 10V

0.5 1.0 1.5 2.0 2.5 3.0 3.5

LOAD CURRENT (A)

MP1423_EC01

MP1423 Rev. 1.1

www.MonolithicPower.com

1

1/6/2006

MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.

© 2006 MPS. All Rights Reserved.

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