4-Channel WLED Controller And High Efficiency Buck Converter with EN pin



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.


  • 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:
  • 144mO/80mO 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


  • 最小输入电压4.5
  • Vin (max) (V)33
  • Channels4
  • fsw (min) (kHz)100
  • Ichannel (max) (A)0.3
  • LEDx ABS Voltage (V)80
  • fsw (max) (kHz)900
  • GradeCatalog
  • PackageTSSOP28 EP
  • Power MOSFETExternal
  • TopologyBoost
  • Dimming (Output)P-Dim, A-Dim
  • Typical LCD Screen SizesMedium (10"-29"), Large (30"-45")
  • Other FeaturesMultiple Outputs