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          SGM3124

          White LED Charge Pump Current Source with PWM Brightness Control
           
          White LED Charge Pump Current Source with PWM Brightness Control
          GENERAL DESCRIPTION

          The SGM3124 is a charge pump with PWM brightness control for white LED supplies in LCD display backlight applications. The supply voltage ranges from 2.7V to 5.5V, it is ideally suited for all applications powered by a single Li-ion battery cell or three to four NiCd, NiMH, or alkaline battery cells.

          The device provides a constant current for each LED, and the initial current value can be set by an external resistor. High efficiency is achieved by utilizing a 1×/1.5× fractional conversion technique in combination with very low dropout current sources.

          The SGM3124 is capable of driving up to three channels of LEDs at 30mA per channel from a 2.7V to 5.5V input. Additionally, the current controlled charge pump ensures low input current ripple and EMI. A low external part count (two 0.47μF flying capacitors and two small 1μF capacitors at VIN and VOUT) makes this part ideally suited for small, battery-powered applications.

          The SGM3124 is available in a Green, space-saving 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 3 LEDs at 30mA Each

          • LED Brightness Control Through PWM Control Signal

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

          • Switching Frequency: 1MHz

          • Regulated Output Current with 0.5% Matching

          • Internal Soft-Start Limits Inrush Current

          • Low Input Ripple and Low EMI

          • Over-Current and Over-Temperature Protected

          • Under-Voltage Lockout with Hysteresis

          • Available in Green TQFN-3×3-16L Package

          APPLICATIONS

          Cellular Phones
          Smart Phones
          Digital Cameras
          Handheld PCs
          Camcorders
          PDAs
          Keypad Backlight

          ORDERING INFORMATION
          Part NumberStatusPackagePinsPb-FreeTemp Range
          SGM3124YTQ16G/TRProductionTQFN-3×3-16L16Y-40℃ to +85℃






           

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