MP28367

1A, 21V, 1.4MHz

Step-Down Converter in a TSOT23-6

MP28367 Rev. 0.9

www.MonolithicPower.com

1

12/13/2007

MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.

© 2007 MPS. All Rights Reserved.

The Future of Analog IC Technology

TM

TM

DESCRIPTION

The MP28367 is a monolithic step-down switch

mode converter with a built-in internal power

MOSFET. It achieves 1A peak 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.

The MP28367 requires a minimum number of

readily available standard external components.

The MP28367 is available in TSOT23-6 packages.

FEATURES

• 1A Output Current

• 0.35Ω Internal Power MOSFET Switch

• Stable with Low ESR Output Ceramic

Capacitors

• Up to 90% Efficiency

• 0.1μA Shutdown Mode

• Fixed 1.4MHz Frequency

• Thermal Shutdown

• Cycle-by-Cycle Over Current Protection

• 6V to 21V Operating Input Range

• Output Adjustable from 0.81V to 15V

• Available in TSOT23-6 Packages

APPLICATIONS

•

Distributed Power Systems

•

Battery Charger

•

Pre-Regulator for Linear Regulators

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

Power Systems, Inc.

TYPICAL APPLICATION

MP28367

SW

FB

BST

GND

IN

EN

1

6

3

2

4

5

3.3V @ 1A

CB

10nF

D1

B230A

12V

OFF ON

100

95

90

85

80

75

70

65

60

55

50

10

100

1000

LOAD CURRENT (mA)

Efficiency vs

Load Current