MP2490

1.5A, 36V, 700KHz Step-Down Converter

with Programmable Output Current Limit

MP2490 Rev. 0.92

www.MonolithicPower.com

1

4/23/2010

MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.

© 2010 MPS. All Rights Reserved.

The Future of Analog IC Technology

DESCRIPTION

The MP2490 is a monolithic step-down switch

mode converter with a programmable output

current limit. It achieves 1.5A continuous output

current over a wide input supply range with

excellent load and line regulation.

The

maximum

output

current

can

be

programmed by sensing current through the

inductor DC resistance (DCR) or an accurate

sense resistor.

Fault condition protection includes cycle-by-cycle

current limiting and thermal shutdown.

The MP2490 requires a minimum number of

readily available standard external components.

The MP2490 is available in QFN10 (3mm x 3mm),

8-pin SOIC and PDIP packages.

FEATURES

• Wide 4.5V to 36V Operating Input Range

• Programmable up to 1.5A Output Current

• Output Adjustable from 0.8V to 15V

• Programmable Output Current Limit without

power loss

• 0.25Ω Internal Power MOSFET Switch

• Stable with Low ESR Output Ceramic

Capacitors

• 95% Efficiency @ 500mA (Vo=5V)

• Fixed 700KHz Frequency

• Thermal Shutdown

• Cycle-by-Cycle Over Current Protection

• Available in QFN10 (3mm x 3mm), 8-Pin

SOIC and PDIP Packages

APPLICATIONS

•

USB Power Supplies

•

Automotive Cigarette Lighter Adapters

•

Power Supply for Linear Chargers

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

Monolithic Power Systems, Inc.

TYPICAL APPLICATION

C9

10nF

EN

VIN

4.5V - 36V

VOUT

GND

5V

R5

R8

D1

L1

VIN

BST

ISN

PGOOD

SW

ISP

GND

FB

EN

SS

MP2490

5

3

1

89

6

10

7

2

4

PGOOD

V-PULL-UP

50

60

70

80

90

100

LOAD CURRENT (mA)

Efficiency vs.

Load Current

10

100

1000

10000