LTC3216

LTC3216 FEATURES 1A Low Noise High Current LED Charge Pump with Independent Torch/Flash Current Control DESCRIPTION n High Efficiency Operation: 1x, 1.5x or 2x Boost Modes with Automatic Mode Switching n Ultralow Dropout ILED Current Control n Output Current up to 1A n Low Noise Constant Frequency Operation n Independent Low Current/High Current Programming and Enable Pins n Wide VIN Range: 2.9V to 4.4V n Open/Shorted LED Protection n LED Disconnect in Shutdown n Low Shutdown Current: 2.5μA n 4% LED Current Programming Accuracy n Automatic Soft-Start Limits Inrush Current n No Inductors n Tiny Application Circuit (All Components <1mm Profile) n 3mm × 4mm 12-Lead DFN Package APPLICATIONS n LED Torch/Camera Light Supply for Cell Phones, PDAs and Digital Cameras n Generic Lighting and/or Flash/Strobe Applications The LTC®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 capacitors, two programming resistors and two bypass capacitors at VIN and CPO) make the LTC3216 ideally suited for small, battery-powered applications. Built-in soft-start circuitry prevents excessive inrush current 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...