MP24971

1.5A, 50V, 100kHz, 5V Fixed Output Step-

Down Converter with Programmable Current

Limit and Output Line-Drop Compensation

MP24971 Rev. 1.01

www.MonolithicPower.com

1

1/6/2012

MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.

© 2012 MPS. All Rights Reserved.

The Future of Analog IC Technology

DESCRIPTION

The MP24971 is a monolithic, step-down,

switch-mode converter with a programmable

output-current limit. It has a fixed 5V/1.5A

continuous output over a wide input supply

range, and has excellent load and line

regulation. It has an internal 2ms-to-4ms soft-

start that prevents inrush current at start-up,

and compensates for output line drop.

MP24971 achieves a low EMI signature with

well-controlled switching edges.

It has fault-condition protections including

hiccup-mode current limit protection, short-

circuit

protection,

output

over-voltage

protection, and thermal shutdown.

The MP24971 requires a minimal number of

readily-available standard external components,

and is available in SOIC8 and SOIC8E

packages.

FEATURES

 Wide 8V-to-50V Operating Input Range

 Output Over-Voltage Protection

 5V Fixed Output

 0.4Ω Internal Power MOSFET

 Internal 4ms Soft-Start

 Stable with Low-ESR Ceramic Output

Capacitors

 Fixed 100kHz Frequency

 Low EMI Signature

 Thermal Shutdown

 Output Line-Drop Compensation

 Hiccup Circuit Limit and Short Circuit

Protection

 Available in SOIC8 and SOIC8E Package

APPLICATIONS

 USB Power Supplies

 Automotive Power Adapters

 Power Supplies for Linear Chargers

All MPS parts are lead-free and adhere to the RoHS directive. For MPS green

status, please visit MPS website under Products, Quality Assurance page.

“MPS” and “The Future of Analog IC Technology” are registered trademarks of

Monolithic Power Systems, Inc.

TYPICAL APPLICATION

+

33µH

MP24971

SW

VOC

ISP

ISN

VOS

BST

VIN

GND

0.1µF

GND

402kO

Diode

22µF

100µF

66mO

0.1µF

1kO

1kO

10nF

10nF

0O

0O

0.1µF

0.1µF

220µF

2.2µF

Efficiency vs.

Output Current

55

60

65

70

75

80

85

90

95

OUTPUT CURRENT (A)

0.1 0.3 0.5 0.7 0.9 1.1 1.3 1.5