Inductorless high current LED charge pump is 90% efficient
18 May 2005
Power Electronics / Power Management
Linear Technology's LTC3215, a fractional charge pump, high current white LED driver IC in a 3 x 3 mm 10-lead DFN package, can deliver up to 700 mA of LED current. Its high efficiency multimode 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 ILED dropout is detected. This enables the LTC3215 to maximise efficiency (up to 92%) throughout the entire Li-Ion operating range.
A 900 kHz switching frequency and a low external parts count (two flying capacitors, two programming resistors and two bypass capacitors at VIN and CPO) provide a very tiny footprint and cost-effective solution, says the manufacturer, and this is ideally suited for video and flash applications in camera phones and other portable lighting applications.
The IC employs built-in soft-start circuitry which prevents excessive start-up inrush current. An ultralow dropout current source maintains accurate LED current as the input voltage approaches the LED forward voltage.
For more information contact Memec SA, +27 (0)21 4103.
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