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    Dual 1.1A LED Flash Driver with I2C-Compatible Interface
    Dual 1.1A LED Flash Driver with I2C-Compatible Interface

    The SGM3784 is a very compact, highly efficient, dual white LED flash driver for high resolution camera phones that improves picture and video quality in low light environments. The device integrates a programmable 1.6MHz or 3MHz synchronous inductive boost converter, an I2C-compatible interface, and two 1.1A current sources. The high switching frequency enables the use of a tiny, 1mm high, low cost, 1μH power inductor, and the parallel current sources permit LED cathode grounding for thermally enhanced, low EMI and compact layouts.

    The LED driver maximizes efficiency over the entire battery voltage range to maximize the input-power-to-LED-power conversion and minimize battery current draw during flash events.

    A programmable DC battery current limit safely maximizes LED current for all LED forward voltage and battery voltage conditions.

    A Transmitter Mask (TxMASK) input enables fast reduction of the flash LED currents and battery current during a power amplifier current burst. The I2C-compatible interface can be used to program timers and currents and to read back status bits for operation monitoring and safety control.

    The SGM3784 is available in WLCSP-2×1.6-12B package and operates within specification over the full -40 to +85 operating temperature range.



    • Ultra Compact Solution

        Small, WLCSP-2×1.6-12B Package

        Smallest Footprint, 1mm-Height, 1μH Power Inductor

    • LED Current Source for Local LED Grounding

        Simplified Routing to and from LEDs

        Improved LED Thermal Dissipation

    • Synchronous 3MHz PWM Boost Converter, No External Diode

    • High Efficiency: 95% Peak

    • I2C Programmable

        Currents up to 1.1A in Flash Mode per LED When VIN is not Lower than 3.6V (The Total 2  LEDs Current is 1.5A When VIN is Lower than 3.6V)

        Torch Mode

        Programmable DC Battery Current Limit

        Programmable Flash Timer up to 1600ms

        Low Battery Mode to Reduce LED Current Automatically

    • Device Control

        I2C-Compatible Control Registers

        External STROBE and Torch Input Pins

        Transmitter Mask (TxMASK) Input

    • Safety Features

        Thermal Overload Protection

        Inductor Fault Detection

        LED Short-Circuit/Open-Circuit Protection


    Camera-Enabled Cellular Phones and Smart-Phones

    Digital Still Cameras, Camcorders and PDAs

    Part NumberStatusPackagePinsPb-FreeTemp Range
    SGM3784YG/TRProductionWLCSP-2×1.6-12B12Y-40℃ to +85℃Samples