MP9943

High Efficiency 3A Peak, 36V,

Synchronous Step Down Converter

With Power Good

MP9943 Rev.1.1

www.MonolithicPower.com

1

7/4/2017

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© 2017 MPS. All Rights Reserved.

The Future of Analog IC Technology

DESCRIPTION

The MP9943 is a high-frequency, synchronous,

rectified, step-down, switch-mode converter

with built-in power MOSFETs. It offers a very

compact solution to achieve a 3A peak output

current with excellent load and line regulation

over a wide input supply range. The MP9943

has synchronous mode operation for higher

efficiency over the output current load range.

Current-mode operation provides fast transient

response and eases loop stabilization.

Full protection features include over-current

protection and thermal shutdown.

The MP9943 requires a minimal number of

readily-available standard external components,

and is available in a space-saving QFN-8

(3mmx3mm) package.

FEATURES

 Wide 4V to 36V Continuous Operating Input

Range

MOSFETs

 410kHz Switching Frequency

 Synchronizes from 200kHz to 2.2MHz

External Clock

 High Duty Cycle for Automotive Cold-crank

 Internal Power-Save Mode

 Internal Soft-Start

 Power Good Indicator

 Over Current Protection and Hiccup

 Thermal Shutdown

 Output Adjustable from 0.8V

 Available in an QFN-8 (3mmx3mm)

package

APPLICATIONS

 General Consumer

 Multi-Function Printers (MFP)

 Distributed Power Systems

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