MP4700

High-Brightness,

BCM, Low Side Buck White LED Driver

MP4700 Rev. 1.0

www.MonolithicPower.com

1

10/29/2012

MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.

© 2012 MPS. All Rights Reserved.

The Future of Analog IC Technology

DESCRIPTION

The MP4700 is a high-efficiency step-down

converter designed to drive high-brightness

light emitting diodes.

The MP4700 drives an external MOSFET in

boundary conduction mode, which features no

reverse recovery loss in the freewheeling diode

and soft turn-on with zero-current and valley

voltage for the power MOSFET that improves

efficiency and minimizes the inductor value and

size. The boundary conduction control mode

regulates the LED current by sensing the

MOSFET peak current through an external

resistor. Its low 300mV feedback voltage

reduces power loss and improves efficiency.

The MP4700 implements PWM dimming to the

LED current.

Protection

features

include

output

short

protection, under-voltage lockout for the IC

input voltage and bus input voltage, a limited

maximum switching frequency, and thermal

shut down.

FEATURES

 8V-to-18V Input Voltage

 Constant-Current LED Driver

 Power MOSFET Zero-Current Turn-On

 No Freewheeling Diode Reverse Recovery

Issues

 High Efficiency and Reliability in Boundary

Conduction Mode

 Low 1mA Operation Current

 PWM Dimming Control

 Hiccup Short Circuit Protection

 UVLO for Bus Input Voltage

 Input UVLO, Thermal Shutdown

 Maximum Frequency Limited to 160kHz

 Available in SOIC8 Package

APPLICATIONS

 LED Backlighting for TV and Monitor

 DC/DC or AC/DC LED Driver applications

 General Illumination

 Industrial Lighting

 Automotive/ Decorative LED Lighting

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