2.7-5.5Vin, 1.8A Synchronous Boost WLED Driver for Over 10 LCD Panel Backlight



The MP3309A is a WLED step-up converter for 2.7V-to-5.5V input that uses peak-current mode to regulate the LED current sensed through an external low-side resistor. The 200mV feedback voltage and synchronous rectification reduces power loss and reduces PCB space requirements. To connect an external Schottky accomplishes the non-synchronous mode for heavy load to improve the thermal performance. 
The MP3309A features a programmable switching frequency to optimize efficiency. It supports both analog and PWM dimming. 
In addition, the MP3309A has LED open protection, cycle-by-cycle current limit protection and thermal shutdown protection. The I2C interface can set the over-voltage protection threshold, analog dimming and read IC status. MP3309A is available in QFN10 3*3mm package.


  • 2.7V-to-5.5V Input Voltage
  • Low 200mV Feedback Voltage with ±1% Accuracy
  • Selectable Synchronous or Non-synchronous Mode Thru I2C
  • 400kHz I2C-Compatible Interface
  • Analog and PWM Dimming
  • Programmable Switching Frequency
  • Programmable Over Voltage Protection Point
  • Software- or Hardware-Enable Function
  • UVLO, Thermal Shutdown
  • Available in 3x3mm QFN10 Package


  • Isw Limit (A)1.8
  • Ishutdown (µA)1
  • 最小输入电压2.7
  • Vin (max) (V)5.5
  • Channels1
  • fsw (min) (kHz)300
  • fsw (max) (kHz)1200
  • Vout (max) (V)35
  • Vfb (V)0.2
  • GradeCatalog
  • Rds(on) (mΩ)300
  • PackageQFN-10 (3x3)
  • Power MOSFETIntegrated
  • TopologyBoost
  • Dimming (Output)P-Dim, A-Dim
  • Iq (mA)0.42
  • Typical LCD Screen SizesMedium (10"-29")
  • Other FeaturesCABC, Sync Rectification