MP2493

2A, 36V, Low EMI Step-Down Converter

with Programmable Output Current Limit

MP2493 Rev. 0.9

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 MP2493 is a monolithic step-down switch

mode converter with a programmable output

current limit. It achieves 2A 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 MP2493 requires a minimum number of

readily available standard external components.

The MP2493 is available in 8-pin SOIC, and 8-

pin SOICE packages.

FEATURES

• Wide 4.5V to 36V Operating Input Range

• Programmable up to 2A 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

• Up to 95% Efficiency

• Fixed 130kHz Frequency with low EMI

• Thermal Shutdown

• Cycle-by-Cycle Over Current Protection

• Available in 8-Pin SOIC and 8-pin SOIC8E

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

0.1uF

C6

47nF

L1

33uH

DR1040-330-R

R6

4.02k

R9

20k

R3

4.7k

R8

0

U1

R7

200k

C11

0.1uF

5V@2A

R2

115k

1%

C7

150pF

R1

604k

1%

R5

0

R4

1k

D2

NS

D1

3A/40V

VIN

BST

ISN

ISP

SS

SW

GND

FB

TP1

SW

TP2

1

4

2

3

8

6

5

7

5V

6V - 36V

VIN

GND

VOUT

GND

MP2493

C10

4.7nF

C5

0.1uF

+

+

Efficiency

OUTPUT CURRENT (A)

60

68

76

84

92

100

0

0.4

0.8

1.2

1.6

2