DESCRIPTION

The SP6685 is a current-regulated charge pump ideal for powering high brightness LEDs for camera flash applications. The charge pump can be set to regulate two current levels for FLASH and TORCH modes. The SP6685 automatically switches modes between step-up and step-down ensuring that LED current does not depend on the forward voltage. A low current sense reference voltage (50mV) allows the use of small 0603 current sensing resistors. The SP6685 is offered in the 10-pin DFN package.

FEATURES

■ Output Current up to 700mA

■ Up to 94 Efficiency in Torch Mode

■ Adjustable FLASH Mode Current

■ Minimum External Components: No Inductors

■ Automatic Buck/Boost Mode Switchover

■ Wide VIN Range: 2.7V to 5.5V

■ High Frequency Operation: 2.4 MHz

■ Low 50mV Reference for low Loss Sensing

■ IQ < 1μA in Shutdown

■ PWM Dimming Control

■ Automatic Soft Start Limits Inrush Current

■ Overvoltage Protection on Output

■ Overcurrent/Temperature Protection

■ Low Ripple and EMI

■ Ultra-low Dropout Voltage in Buck Mode

■ Space Saving 10-pin 3mm x 3mm DFN Package

APPLICATIONS

■ White LED Torch/Flash for Cell Phones, DSCs, and Camcorders

■ White LED Backlighting

■ Generic Lighting/Flash/Strobe Applications

■ General Purpose High Current Boost