MP38875

15A, 16V, 800kHz Step-Down

Converter with Synchronous Gate Driver

MP38875 Rev. 0.9

www.MonolithicPower.com

1

11/20/2009

MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.

© 2009 MPS. All Rights Reserved.

The Future of Analog IC Technology

DESCRIPTION

The MP38875 is a monolithic step-down switch

mode converter with a built in internal power

MOSFET. It achieves 15A continuous 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 MP38875 requires a minimum number of

readily available standard external components

and is available in a 20-pin 3mm x 4mm QFN

package.

The MP38875 is ideal for a wide range of

applications including distributed power systems,

pre-regulator for linear regulators, compact DC-

DC regulators for PCB space limited platforms.

FEATURES

• Wide 4.5V to 16V Operating Input Range

• 15A Output Current

• 25mΩ Internal Power MOSFET Switch

• Synchronous Gate Driver

• Synch from 300KHz to > 1MHz External Clock or

800KHz Fixed Switching Frequency

• Synch Output to Drive Another Regulator in

Phase-Shift Operation

• Feedback Voltage Accuracy: 2%

• Programmable Soft-Start

• Startup Tracking

• EN and Power Good for Power Sequencing

• Cycle-by-Cycle Over Current Protection

• Thermal Shutdown

• Output Adjustable from 0.8V to 12V

• Stable with Low ESR Output Ceramic

Capacitors

• Available in a 3mm x 4mm QFN Package

APPLICATIONS

•

Distributed Power Systems

•

Pre-Regulator for Linear Regulators

•

Compact DC-DC Regulator for PCB Space

Limited Platforms

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

Power Systems, Inc.

TYPICAL APPLICATION

MP38875

SW

BG

FB

BST

GND

IN

VCC

COMP

PG

EN

1.8V/15A

OFF ON

R3

C1

22uF

25V

C2

100uF

6.3V

CB

1uF

L1

0.72uH

C3

C6

System

SS/TRK

SYNCIN

SYNCOUT

Efficiency vs. Output Current

20

30

40

50

60

70

80

90

100

02

46

8 10 12 14 16