MP28372

Dual 1.5A, 23V, 1.4MHz

Step-Down Converter

MP28372 Rev. 1.4

www.MonolithicPower.com

1

12/10/2007

MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.

© 2007 MPS. All Rights Reserved.

The Future of Analog IC Technology

DESCRIPTION

The MP28372 is a dual monolithic step-down

switch mode converter with built-in internal

power MOSFETs. It achieves 1.5A continuous

output current for each output 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. In

shutdown mode, the regulator draws 40μA of

supply current.

The MP28372 requires a minimum number of

readily available standard external components.

EVALUATION BOARD REFERENCE

Board Number

Dimensions

EV28372DF-01A

2.2”X x 1.6”Y x 0.4”Z

FEATURES

• 1.5A Current for Each Output

• 0.18Ω Internal Power MOSFET Switches

• Stable with Low ESR Output Ceramic

Capacitors

• Up to 90% Efficiency

• 40μA Shutdown Mode

• Fixed 1.4MHz Frequency

• Thermal Shutdown

• Cycle-by-Cycle Over Current Protection

• Wide 4.75V to 23V Operating Input Range

• Each Output Adjustable from 0.92V to 16V

• Configurable for Single Output with Double

the Current

• Programmable Under Voltage Lockout

• Programmable Soft-Start

• Available in TSSOP20 with Exposed Pad

and SOIC Packages

APPLICATIONS

• Distributed Power Systems

• I/O and Core supplies

• DSL Modems

• Set top boxes

• Cable Modems

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

Power Systems, Inc.

TYPICAL APPLICATION

MP28372

SSB

BSB

NC2

INB

SWB

PGB

SGB

FBA

COMPA

ENA

10

9

8

7

6

5

4

3

2

1

SSA

NC1

BSA

INA

SWA

PGA

SGA

FBB

COMPB

ENB

20

19

18

17

16

15

14

13

12

11

3.3nF

10nF

82pF

10nF

2.5V @ 1.5A

OFF ON

OFF ON

2A

Schottky

2A

Schottky

12V

3.3V @ 1.5A

2.2nF

100

90

80

70

60

50

0

0.5

1.0

1.5

LOAD CURRENT (A)

Efficiency vs

Load Current