Diodes Incorporated – Boost LED driver features programmable dimming function


The new AL3050 from Diodes Inc., is a current-mode boost LED driver for portable devices which offers a programmable dimming control function.
Featuring an integrated 30V power MOSFET and Schottky diode, the AL3050 can drive as many as eight LEDs in series. The implementation of a complete driver circuit based on the ASL3050 only requires the addition of four external components, which means that the total system footprint is small.

The driver operates at a high efficiency of up to 85%, and this, combined with its small size, make it ideal for LED backlighting systems
in portable equipment powered by a single lithium-ion cell.

Brightness control is implemented by the AL3050 via either PWM or single-wire digital dimming, giving accurate LED current control from one pin.

The AL3050 offers under-voltage lock- out, over-voltage, over-current and thermal protection functions.


  • 28V open-LED protection for up to eight LEDs
  • 200mV reference accurate to ±3%
  • 750kHz switching frequency
  • Up to 100:1 PWM dimming ratio
  • Integrated loop compensation
  • Soft start
  • Operating-temperature range:
    -40°C to 85°C


  • Internet of Things end nodes
  • Portable media players
  • Mobile devices
  • GPS receivers
  • Backlights for small LCD displays
Part NumberMinimum Input VoltageMaximum Input VoltageMaximum Output VoltageLED CurrentQuiescent Current