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FAN5609 - Fairchild Semiconductor

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FAN5609 LED Driver with Adaptive Charge Pump DC/DC Converter

The FAN5609 generates regulated output current from a battery with input voltage varying between 2.7V to 5.5V. Switch reconfiguration and fractional switching techniques are utilized to achieve high efficiency over the entire input voltage range. A proprietary internal circuitry continuously monitors each LED current loop and automatically adjusts the generate.

Features






• Parallel LED Driver Supports All Forward Voltages Adaptive VOUT Adjustment to the Highest Diode Voltage Internally Matched LED Current Sources No External Components Needed to Set LED Current Built-in Charge Pump has Three Modes of Operation:
  – Linear Regulation VIN > 4.2V
  – 3/2 DC-DC Converter and Regulation 3.6V  – 2/1 DC-DC Converter and Regulation 2.7V

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