DESCRIPTION
The LTC®3217 is a low noise charge pump DC/DC converter designed to power four high current LEDs. The LTC3217 requires only four small ceramic capacitors and two current set resistors to form a complete LED power supply and current controller.

FEATURES
■ Charge Pump Provides High Efficiency with Automatic Mode Switching
■ Multimode Operation: 1x, 1.5x, 2x
■ Four Low Dropout LED Outputs
■ Up to 600mA Total Output Current
■ Independent Torch and Flash ISET and Enable Pins
■ Low Noise Constant Frequency Operation*
■ PWM Brightness Control via the EN2 Pin
■ Low Shutdown Current: 4µA
■ Internal Soft-Start Limits Inrush Current During Start-Up and Mode Switching
■ Open/Short LED Protection
■ No Inductors
■ (3mm x 3mm) 16-Lead QFN Plastic Package

APPLICATIONS
■ Multi-LED Camera Light Supply for Cellphones/DSCs/PDAs