SG Micro Corp

SGM3146 8-Channel Charge Pump White LED Driver with Low Dropout Current Source


The SGM3146 is a high performance white LED driver. It integrates current sources and automatic mode selection charge pump. The part maintains the high efficiency by utilizing a 1×/1.5× fractional charge pump and low dropout current sources. The small equivalent 1× mode open loop resistance and ultra-low dropout voltage of current source extend the operating time of 1× mode and optimize the efficiency of Li-ion battery in white LED applications.

The SGM3146 supports up to 8 white LEDs and regulates a constant current which the initial value can be set by an internal resistor. The part implements a 4-bit DAC for brightness control. Users can easily configure the LED current from 1.65mA to 27mA by a serial pulse. The dimming of white LEDs current can be achieved by applying a pulse signal to the EN/SET pin. There are totally 16 steps of current could be set by users. The operating voltage range is 2.7V to 5.5V. Internal soft-start circuitry effectively reduces the in-rush current while both start-up and mode transition.

The SGM3146 is available in Green TQFN-3×3-20L package and is rated over the -40 to +85 temperature range.



• Input Voltage Range: 2.7V to 5.5V
• Drives up to 8 LEDs at 27mA Each
• One Single Wire Interface
• 16-Step Brightness Control
• High Efficiency by Fractional Conversion with
    1× and 1.5× Modes
• Switching Frequency: 0.93MHz
• Regulated Output Current with ±4.8% Matching
• Internal Soft-Start Limits Inrush Current
• Low Input Ripple and Low EMI
• Over-Current and Over-Temperature Protection
• Under-Voltage Lockout with Hysteresis
• Available in Green TQFN-3×3-20L Package


Mobile Phone, DSC, MP3
White LED Backlighting
LCD Display Supply


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

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