4-Channel WLED Controller with High-Efficiency Buck Converter

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Part #:
Contact Symmetry For Lead Time
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Unit Price:$1.26
Minumum Qty: 2500
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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 package.

Symmetry Electronics is an authorized Monolithic Power Systems distributor.


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WLED Controller:
4-String, Max 350mA/String, WLED Controller
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
Over-Current Protection
Over-Temperature Protection
Inductor/Diode Short Protection
Buck Converter:
144m?/80m? Low RDS(ON) Internal Power MOSFETs
Low Quiescent Current
Fixed 235kHz Switching Frequency
Frequency Sync from 250kHz to 2MHz
External Clock
Internal Soft Start
OCP and Hiccup Mode
Over-Temperature Protection
Output Adjustable from 0.8V


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Monolithic Power Systems Datasheet

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