MP1583

3A, 23V, 385KHz

Step-Down Converter

MP1583 Rev. 3.1

www.MonolithicPower.com

1

6/20/2011

MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.

© 2011 MPS. All Rights Reserved.

The Future of Analog IC Technology

DESCRIPTION

The MP1583 is a step-down regulator with a

built-in internal Power MOSFET. It achieves 3A

of 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. An adjustable soft-start reduces the

stress on the input source at startup. In

shutdown mode the regulator draws 20μA of

supply current.

The MP1583 requires a minimum number of

external components, providing a compact

solution.

FEATURES

• 3A Output Current

• Programmable Soft-Start

• 100mΩ Internal Power MOSFET Switch

• Stable with Low ESR Output Ceramic Capacitors

• Up to 95% Efficiency

• 20μA Shutdown Mode

• Fixed 385KHz Frequency

• Thermal Shutdown

• Cycle-by-Cycle Over Current Protection

• Wide 4.75V to 23V Operating Input Range

• Output 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 Registered Trademarks of

Monolithic Power Systems, Inc.

TYPICAL APPLICATION

INPUT

4.75V to 23V

OUTPUT

2.5V

3A

MP1583

BS

IN

FB

SW

SS

GND

COMP

EN

1

3

5

6

4

8

7

2

OPEN =

AUTOMATIC

STARTUP

10nF

5.6nF

10nF

10

μ F

CERAMIC

22

μ F

CERAMIC

3.9k

Ω

10k

Ω

10.5k

Ω

15

μ H

B330A

MP1583_EC01

Efficiency Curve

100

90

80

70

60

50

0

0.5 1.0 1.5 2.0 2.5 3.0 3.5

LOAD CURRENT (A)