4-Channel WLED Controller
with High-Efficiency Buck Converter
The MP3378E is a one-chip solution specially
designed for monitor applications. The
MP3378E includes a step-up WLED controller
with four current channels for backlighting, and
a high-efficiency buck converter for internal bus
voltage or standby power.
The 4-string WLED controller drives an external
MOSFET to boost up the output voltage from
the input supply. It regulates the current in each
LED string to the programmed value set by an
external current setting resistor. It supports both
analog and PWM dimming independently to
meet special dimming mode requests. Full
protection features for the WLED controller
include OCP, OTP, UVP, OVP, LED short/open
protection, and inductor/diode short protection.
The high-efficiency buck converter operates in
the current mode operation with a built-in
MOSFET and a built-in synchronous rectifier. It
offers a very compact solution to achieve
excellent load and line regulation. Full
protection features for the buck converter
include OCP and thermal shutdown.
The MP3378E is available in a TSSOP-28 EP
4-String, Max 350mA/String, WLED
Up to 24V Input Voltage Range
2.5% Current Matching Accuracy
Programmable Switching Frequency
PWM and Analog Dimming Mode
LED Open and Short Protection
Programmable Over-Voltage Protection
Recoverable Thermal Shutdown Protection
Inductor/Diode Short Protection
144mΩ/80mΩ Low RDS(ON) Internal Power
Low Quiescent Current
Fixed 235kHz Switching Frequency
Frequency Sync from 250kHz to 2MHz
Internal Soft Start
OCP and Hiccup Mode
Output Adjustable from 0.8V
Desktop LCD Flat Panel Displays
Flat Panel Video Displays
2D/3D LCD TVs and Monitors
All MPS parts are lead-free, halogen-free, and adhere to the RoHS directive. For
MPS green status, please visit the MPS website under Quality Assurance.
“MPS” and “The Future of Analog IC Technology” are registered trademarks of
Monolithic Power Systems, Inc.
MP3378E Rev. 1.02
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