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    Dual-Channel WLED Driver for Smart Phone
    Dual-Channel WLED Driver for Smart Phone

    The SGM3743 is dual-channel WLED driver which provides highly integrated solutions for single-cell Li-ion battery powered smart phone backlight. The device has a built-in high efficiency boost regulator with integrated 1.5A/40V power MOSFET and supports as low as 3V input voltage. With two high current-matching capability current sink regulators, the device can drive up to 10S2P WLED diodes. The boost output can automatically adjust to the WLED forward voltage and allow very low voltage headroom control, thus to improve LED strings efficiency effectively.

    The SGM3743 support both of the PWM dimming interface and one wire digital dimming interface and can realize 9-bit brightness code programming. The SGM3743 integrates built-in soft-start, over-voltage, over-current protection, and thermal shutdown protection.

    The SGM3743 is available in a Green WLCSP-1.32×1.32-9B package and operates over the -40 to +85 temperature range.



    • 3V to 18V Input Voltage Range

    • Integrated 1.5A/40V MOSFET

    • 1.2MHz Switching Frequency

    • Optimized Rise Time and Fall Time to Control EMI for SW Pin

    • Dual Current Sinks of up to 30mA Current Each

    • 1% Typical Current Matching and Accuracy

    • 38.5V OVP, 1.2MHz Frequency

    • Adaptive Boost Output to WLED Voltages

    • Very Low Voltage Headroom Control (90mV)

    • Flexible Digital and PWM Brightness Control

    • One Wire Control Interface

    • PWM Dimming Control Interface

    • Up to 9-Bit Dimming Resolution

    • Up to 90% Efficiency

    • Built-In Soft-Start Function

    • Over-Voltage Protection

    • Built-In WLED Open/Short Protection

    • Dimming Stable in More than 1:500 PWM Range

    • PFM Mode at Light Load

    • Thermal Shutdown

    • Support 4.7μH Inductor Application

    • -40 to +85 Operating Temperature Range

    • Available in a Green WLCSP-1.32×1.32-9B Package


    Smart Phones
    PDAs, Handheld Computers
    GPS Receivers
    Backlight for Small and Media Form Factor
    LCD Display with Single-Cell Battery Input

    Part NumberStatusPackagePinsPb-FreeTemp Range
    SGM3743YG/TRProductionWLCSP-1.32×1.32-9B9Y-40℃ to +85℃Samples