24 V, 4-Channel WLED Controller Plus High-Efficiency Buck Converter

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Part #:
Lead Time 64 weeks
Unit Price:$1.12
Minumum Qty: 500
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The MP3378 is a one-chip solution designed for monitor applications. It includes a step-up controller with 4 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 the special dimming mode request. In addition, rich protection modes are integrated including OCP, OTP, UVP, OVP, LED short/open protection, and inductor/diode short protection.

The high-efficiency buck converter operates in current mode with a built in MOSFET and synchronous rectifier. It offers a very compact solution to achieve excellent load and line regulation. Full protection features include OCP and thermal shutdown.

The MP3378 is available in SOIC28 and TSSOP28EP package.

Symmetry Electronics is an authorized Monolithic Power Systems distributor.


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WLED Controller:
4-String, Max 350 mA/String WLED Controller
Up to 24 V Input Voltage Range
2.5% Current Matching Accuracy
Programmable Switching Frequency
PWM and Analog Dimming Mode
Open and Short LED Protection
Programmable Over-Voltage Protection
Recoverable Thermal Shutdown Protection
Over-Current Protection
Over-Temperature Protection
Inductor/Diode Short Protection
Buck Converter:
144 m?/58 m? Low Rds(on) Internal Power MOSFETs
Low Quiescent Current
Fixed 235 kHz Switching Frequency
Frequency Sync from 250 kHz to 2 MHz External Clock
AAM Power-Save Mode
Internal Soft Start
OCP and Hiccup
Over-Temperature Protection
Output Adjustable from 0.8 V


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Monolithic Power Systems Datasheet

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