MP3900

High Efficiency

Boost Controller

MP3900 Rev. 1.0

www.MonolithicPower.com

1

12/17/2013

MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.

© 2013 MPS. All Rights Reserved.

The Future of Analog IC Technology

DESCRIPTION

The MP3900 is a boost controller that drives an

external MOSFET capable of handling 10A

current. It has an operational current of typically

180µA and can accommodate off-line, Telecom

and

non-isolated

applications.

Internal

undervoltage lockout, slope compensation and

peak current limiting are all provided to

minimize the external component count. In a

boost application, with an output voltage of less

than 30V, the current sense pin can connect

directly to the drain of the external switch. This

eliminates the requirement for an additional

current sensing element and its associated

efficiency loss.

While designed for boost applications, the

MP3900 can also be used for other topologies

including Forward, Flyback and Sepic. The 10V

gate driver voltage minimizes the power loss of

the external MOSFET while allowing the use of

a wide variety of standard threshold devices.

The MP3900 is available in 8-pin MSOP and

SOIC packages.

FEATURES

• Current Mode Control

• 10V MOSFET Gate Driver

• Undervoltage Lockout

• Internal Soft-Start

• Cycle-by-Cycle Current Limiting

• Slope Current Compensation

• 10µA Shutdown Current

• 180µA Quiescent Current

• 330KHz Constant Frequency Operation

• Applicable to Boost, SEPIC, Flyback and

Forward Topologies

• Available

in

an

8-Pin

MSOP/SOIC

Packages

APPLICATIONS

• TV CCFL Power Generation

• Telecom Isolated Power

• Brick Modules

• Off-line Controller

All MPS parts are lead-free and adhere to the RoHS directive. For MPS green

status, please visit MPS website under Quality Assurance. “MPS” and “The

Future of Analog IC Technology” are Registered Trademarks of Monolithic

Power Systems, Inc.

TYPICAL APPLICATION

MP3900

VCC

SGND

PGND

GATE

ISENSE

COMP/RUN

FB

25V/2A

C3

10nF

D1

7

5

4

8

1

3

2

FDS6630A

0

0.5

1.0

1.5

2.0

2.5

3.0

Current

(A)

Efficiency

91

92

93

94

95

96

97

98