LTC3216

The LTC ^(R)3216 is a low noise, high current charge pump DC/DC converter designed to power high current LEDs. The part includes an accurate programmable current source capable of driving loads up to 1A from a 2.9V to 4.4V input. Low external parts count (two flying capaci- tors, two programming resistors and two bypass capaci- tors at V_IN  and CPO) make the LTC3216 ideally suited for small, battery-powered applications.

Built-in soft-start circuitry of LTC3216 prevents excessive inrush cur- rent during start-up. High switching frequency enables the use of small external capacitors. Independent high and low current settings are programmed by two external resistors. Shutdown mode and current output levels are selected via two logic inputs.

An ultralow dropout current source maintains accurate LED current at very low ILED voltages. Automatic mode switching optimizes efficiency by monitoring the voltage across the LED current source and switching modes only when I  dropout is detected. The LTC3216 is available in a small 3mm × 4mm 12-Lead DFN package.