MP4700
High-Brightness,
BCM, Low Side Buck White LED Driver
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
LED Backlighting for TV and Monitor
DC/DC or AC/DC LED Driver applications
General Illumination
Industrial Lighting
Automotive/ Decorative LED Lighting
APPLICATIONS
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
MP4700 Rev. 1.0
10/29/2012
www.MonolithicPower.com
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2012 MPS. All Rights Reserved.
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