SP6686

www.DataSheet4U.com SP6686 400mA Buck/Boost Charge Pump LED Driver FEATURES ■ Output Current up to 480mA 10 VOUT VIN 1 ■ Up to 94% Efficiency in Torch Mode C1 2 SP6686 9 PGND ■ Automatic Softstart limits inrush current 8 SGND C2 3 ■ Adjustable FLASH mode 10 Pin DFN 7 I FLASH 4 FB ■ x1 and x2 Automatic Modes for High Efficiency 6 I EN 5 SET ■ Minimum External Components: No Inductors ■ High Frequency Operation: 2.4 MHz Now Available in Lead Free Packaging ■ Low 50mV reference for low loss sensing ■ 1µA shutdown current ■ PWM Dimming Control APPLICATIONS ■ Automatic switchover between buck/boost ■ White LED Torch/Flash for Cell ■ Over voltage protection on output Phones, DSCs, and Camcorders ■ Over current/temerature protection ■ Generic Lighting/Flash/Strobe ■ Low Ripple and EMI Applications ■ Space Saving 10-pin 3mm x 3mm DFN ■ White LED Backlighting Package DESCRIPTION The SP6686 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 SP6686 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 SP6686 is offered in 10-pin DFN package. TYPICAL APPLICATION CIRCUIT VIN (2.7 - 5.5V) VIN CFC 0.47µF TORCH/FLASH ENABLE C1 C2 FLASH EN VOUT 400mA FLASH COUT 1µF WLED ® CI...