8-Channel Charge Pump White LED Driver with Low Dropout Current Source
8-Channel Charge Pump White LED Driver with Low Dropout Current Source

The SGM3146 is a current-regulated white LED driver with integrated low dropout current sources and a high efficiency charge pump. The charge pump has automatically selectable 1×/1.5× fractional operation modes. The SGM3146 is well suited for white LED applications powered by a Li-Ion battery due to small equivalent open-loop resistance in 1× mode.

The supply voltage operates from 2.7V to 5.5V. The SGM3146 supports up to 8 LEDs for 27mA maximum current per string. The LED reference current is set through an internal resistor. The SGM3146 contains a 4-bit digital-to-analog converter for 16-step LED current control. The LED current can be set between 1.65mA and 27mA by a serial pulse input signal into the EN/SET pin. Built-in soft-start circuitry avoids excessive inrush current during startup and mode transition.

The SGM3146 is available in a Green TQFN-3×3-20L package. It operates over an ambient temperature range of -40 to +85.



  • Input Voltage Range: 2.7V to 5.5V

  • Support up to 8 LEDs at 27mA Each

  • 16-Step LED Brightness Control through One-Wire Interface

  • 1× and 1.5× Charge Pump for High Conversion Efficiency

  • Switching Frequency: 0.93MHz

  • ±4.8% Regulated LED Current Matching

  • Built-in Soft-Start for Reducing Inrush Current

  • Low Input Ripple and Low EMI

  • Protection Features

    Over-Current Protection

    Under-Voltage Lockout

    Thermal Shutdown

  • Operating Temperature Range: -40 to +85

  • Available a in Green TQFN-3×3-20L Package


White LED Backlighting

Mobile Phones, MP3s

Digital Still Cameras

LCD Displays

Part Number Status Package Pins Pb-Free Temp Range
SGM3146YTQG20G/TR Production TQFN-3×3-20L 20 Y -40℃ to +85℃ Samples