SP6685

SP6685 700mA Buck/Boost Charge Pump LED Driver FEATURES ■ Output Current up to 700mA VIN 1 10 VOUT ■ Up to 94% Efficiency in Torch Mode ■ Adjustable FLASH Mode Current ■ Minimum External Components: No Inductors ■ Automatic Buck/Boost Mode Switchover C1 2 C2 3 FLASH 4 SP6685 9 10 Pin DFN 8 7 PGND SGND FB ■ Wide VIN Range: 2.7V to 5.5V EN 5 6 RSET ■ High Frequency Operation: 2.4 MHz ■ Low 50mV Reference for low Loss Sensing Now Available in Lead Free Packaging ■ IQ < 1μA in Shutdown ■ PWM Dimming Control ■ Automatic Soft Start Limits Inrush Current ■ Overvoltage Protection on Output APPLICATIONS ■ White LED Torch/Flash for Cell Phones, DSCs, and Camcorders ■ White LED Backlighting ■ Overcurrent/Temperature Protection ■ Low Ripple and EMI ■ Generic Lighting/Flash/Strobe Applications ■ Ultra-low Dropout Voltage in Buck Mode ■ General Purpose High Current Boost ■ Space Saving 10-pin 3mm x 3mm DFN Package 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. VIN (2.7 - 5.5V) O CIN 4.7μF CFC 1μF TORCH/FLASH ENABLE TYP...