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MP1593

3A, 28V, 385KHz Step-Down Converter

Monolithic Power Systems 

TM

The Future of Analog IC Technology TM

DESCRIPTION

The MP1593 is a step-down regulator with an

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 MP1593 requires a minimum number of

readily available external components,

providing a compact solution.

EVALUATION BOARD REFERENCE

Board Number

EV1593DN-00A

Dimensions

2.1”X x 1.3”Y x 0.4”Z

TYPICAL APPLICATION

INPUT

4.75V to 28V

OFF ON

C5

10nF

2

7

IN

EN

1

BS

SW

3

MP1593

8 SS

FB 5

GND

COMP

4

6

C3

C6

8.2nF

(optional)

D1

B340A

MP1593

3A, 28V, 385KHz

Step-Down Converter

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 28V Operating Input Range

• Output Adjustable from 1.22V

• Under-Voltage Lockout

• Available in 8-Pin SOIC Package

APPLICATIONS

• Distributed Power Systems

• Battery Chargers

• Pre-Regulator for Linear Regulators

• Flat Panel TVs

• Set-Top Boxes

• Cigarette Lighter Powered Devices

• DVD/PVR Devices

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

Power Systems, Inc.

OUTPUT

3.3V

3A

Efficiency vs

Load Current

100

95

VIN = 9V

90

85

VIN = 24V

80

VIN = 12V

75

70

65

60

55

50

0 0.5 1.0 1.5 2.0 2.5 3.0 3.5

LOAD CURRENT (A)

MP1593 Rev. 1.9

www.MonolithicPower.com

1

9/14/2006

MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.

© 2006 MPS. All Rights Reserved.

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