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SGM3138

6-Channel Charge Pump White LED Driver with Low Dropout Current Source
 
6-Channel Charge Pump White LED Driver with Low Dropout Current Source
GENERAL DESCRIPTION

The SGM3138 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 SGM3138 supports up to 6 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 1.25mA to 20mA 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 SGM3138 is available in Green TQFN-3×3-16L package and is rated over the -40 to +85 temperature range.

PIN CONFIGURATIONS

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FEATURES
  • Input Voltage Range: 2.7V to 5.5V

  • Drives Up to 6 LEDs at 20mA Each

  • One Single Wire Interface

  • 16-Step Brightness Control

  • High Efficiency by Fractional Conversion with 1× and 1.5× Modes

  • Switching Frequency: 1MHz

  • Regulated Output Current with ±5% 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-3×3-16L Package

APPLICATIONS

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

ORDERING INFORMATION
Part NumberStatusPackagePinsPb-FreeTemp Range
SGM3138YTQ16G/TRProductionTQFN-3×3-16L16Y-40℃ to +85℃Samples

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