Linear Technology announces the LTC3215, a fractional charge pump, high current white LED driver that delivers up to 700mA of LED current. Its multi-mode architecture automatically switches between 1x, 1.5x or 2x boost modes by monitoring the voltage across the LED current source and switching modes only when LED current dropout is detected. This enables the LTC3215 to maximize efficiency (up to 92%) throughout the entire Li-Ion operating range. A 900kHz switching frequency and a low external parts count (two flying capacitors, two programming resistors and two bypass capacitors at VIN and CPO) provide a tiny footprint, suited for video and flash applications in camera phones and other portable lighting applications. The LTC3215 employs built-in soft-start circuitry which prevents inrush current during start-up. An low dropout current source maintains accurate LED current as the input voltage approaches the LED forward voltage. The LTC3215 is available in a low profile (0.75mm), 3mm x 3mm 10-lead DFN package. Pricing starts at $1.75 each for 1,000-piece quantities.