500mA Buck/Boost Charge Pump LED Driver
500mA Buck/Boost Charge Pump LED Driver

The SGM3140B is a current-regulated buck/boost charge pump LED driver capable of driving 500mA output current. It is ideal for powering high brightness LEDs for camera flash applications. The SGM3140B has 1×/2× operation mode to control the output current for flash and torch modes. Both flash and torch modes can be used continuously until thermal shutdown occurs.

The supply voltage operates from 2.7V to 5.5V and is well suited for various applications powered by a 1-cell Li-Ion battery, as well as 3-cell or 4-cell NiCd, NiMH or Alkaline batteries. The SGM3140B automatically converts between boost and buck modes. Therefore, it ensures that LED current cannot be restricted by the forward voltage. High switching frequency makes it easy to use tiny components. Small 0603 current sense resistors can be used due to the low FB reference voltage.

The SGM3140B provides very low shutdown current and soft-start function. Built-in soft-start circuitry avoids excessive inrush current during startup. The SGM3140B also includes a comprehensive set of protection features such as over-voltage protection, over-current protection and thermal shutdown.

The SGM3140B is available in a Green TDFN-3×3-10L package and is specified over an ambient temperature range of -40 to +85.



  • Input Voltage Range: 2.7V to 5.5V

  • Up to 500mA Output Current

  • Up to 90% Efficiency in Torch Mode

  • Programmable Flash Current

  • Automatic Buck/Boost Mode Conversion

  • No External Inductors

  • High Switching Frequency: 2.2MHz

  • Low Reference for Low Loss Sensing: 47mV

  • Less than 1μA Shutdown Current

  • Automatic Soft-Start for Reducing Inrush Current

  • Low Input and Output Ripple and Low EMI

  • Protection Features

    Output Over-Voltage Protection

    Over-Current Protection

    Thermal Shutdown

  • Available in a Green TDFN-3×3-10L Package


White LED Torch or Flash for Mobile Phones, Camcorders and DSCs

Generic Lighting, Strobe and Flash Applications

White LED Backlighting

General Purpose High Current Boost

Part Number Status Package Pins Pb-Free Temp Range
SGM3140BYD10G/TR Production TDFN-3×3-10L 10 Y -40℃ to +85℃ Samples