MP1591

2A, 32V, 330KHz

Step-Down Converter

MP1591 Rev. 2.1

www.MonolithicPower.com

1

12/5/2005

MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.

© 2005 MPS. All Rights Reserved.

The Future of Analog IC Technology

TM

TM

DESCRIPTION

The MP1591 is a high voltage step-down

converter ideal for automotive power adapter

battery chargers. Its wide 6.5V to 32V input

voltage range covers the automotive battery’s

requirements and it achieves 2A continuous

output for quick charge capability.

Current mode operation provides fast transient

response and eases loop stabilization. Fault

protection

includes

cycle-by-cycle

current

limiting and thermal shutdown. In shutdown

mode, the converter draws only 20µA of supply

current.

The MP1591 requires a minimum number of

readily

available

external

components

to

complete a 2A step-down DC to DC converter

solution.

EVALUATION BOARD REFERENCE

Board Number

Dimensions

EV0020

2.1”X x 1.4”Y x 0.5”Z

FEATURES

• Wide 6.5V to 32V Input Operating Range

• 34V Absolute Maximum Input

• 2A Output Current

• 120mΩ Internal Power MOSFET Switch

• Stable with Low ESR Output Ceramic

Capacitors

• Up to 95% Efficiency

• 20µA Shutdown Mode

• Fixed 330KHz Frequency

• Thermal Shutdown

• Cycle-by-Cycle Over Current Protection

• Output Adjustable From 1.23V to 21V

• Under Voltage Lockout

• Reference Voltage Output

• Available in 8-Pin SOIC Packages

APPLICATIONS

• Automotive Power Adapters

• PDA and Cellular Phone Battery Chargers

• Distributed Power Systems

• Automotive Aftermarket Electronics

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

Power Systems, Inc.

TYPICAL APPLICATION

INPUT

6.5V to 32V

OPEN

NOT USED

OUTPUT

2.5V

2A

C4

4.7nF

D1

C2

10nF

MP1591

BS

IN

FB

SW

REF

GND

COMP

EN

1

3

5

6

4

8

7

2

MP1591_TAC_S01

C3

OPEN

OFF ON

100

90

80

70

60

50

40

30

20

0

0.5

1

1.5

2

LOAD CURRENT (A)

MP1591_EC01

Efficiency vs

Load Current