MP1593

3A, 28V, 385KHz

Step-Down Converter

MP1593 Rev. 1.9

www.MonolithicPower.com

1

9/14/2006

MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.

© 2006 MPS. All Rights Reserved.

The Future of Analog IC Technology

TM

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

Dimensions

EV1593DN-00A

2.1”X x 1.3”Y x 0.4”Z

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.

TYPICAL APPLICATION

INPUT

4.75V to 28V

OUTPUT

3.3V

3A

C3

8.2nF

D1

B340A

C5

10nF

MP1593

BS

IN

FB

SW

SS

GND

COMP

EN

C6

(optional)

1

3

5

6

4

8

7

2

OFF ON

100

95

90

85

80

75

70

65

60

55

50

LOAD CURRENT (A)

Efficiency vs

Load Current

0

0.5

1.0 1.5

2.0

2.5

3.0

3.5