DESCRIPTION
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.

FEATURES
■ High Effi ciency Operation: 1x, 1.5x or 2x Boost Modes with Automatic Mode Switching
■ Ultralow Dropout ILED Current Control
■ Output Current up to 1A
■ Low Noise Constant Frequency Operation
■ Independent Low Current/High Current Programming and Enable Pins
■ Wide VIN Range: 2.9V to 4.4V
■ Open/Shorted LED Protection
■ LED Disconnect in Shutdown
■ Low Shutdown Current: 2.5μA
■ 4% LED Current Programming Accuracy
■ Automatic Soft-Start Limits Inrush Current
■ No Inductors
■ Tiny Application Circuit (All Components <1mm Profi le)
■ 3mm × 4mm 12-Lead DFN Package

APPLICATIONS
■ LED Torch/Camera Light Supply for Cell Phones, PDAs and Digital Cameras
■ Generic Lighting and/or Flash/Strobe Applications