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SP6686 Datasheet(PDF) 1 Page - Exar Corporation |
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SP6686 Datasheet(HTML) 1 Page - Exar Corporation |
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1 / 12 page  S SP P6 66 68 86 6 4 40 00 0m mA A B Bu ucck k/ /B Bo oo os stt C Ch ha arrg ge e P Pu um mp p L LE ED D D Drriiv ve err August 2009 Rev. 2.0.0 Exar Corporation www.exar.com 48720 Kato Road, Fremont CA 94538, USA Tel. +1 510 668-7000 – Fax. +1 510 668-7001 GENERAL 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 designed to operate from a single cell lithium-ion battery or fixed 3.3V or 5.0V power rails and is available in a RoHS compliant, “green”/halogen free space saving 10-pin 3mmx3mm DFN package APPLICATIONS • White LED Torch/Flash for Mobile Phones, DSCs and Camcorders • Generic Lighting/Flash/Strobe Applications • White LED Backlighting FEATURES • Output Current up to 400mA • Up to 94% Efficiency in Torch Mode • Adjustable FLASH Mode • x1 and x2 Automatic Modes for High Efficiency • Minimum External Components: No Inductors • 2.4MHz High Frequency Operation • 1μA Shutdown Current • Built-In Soft Start Limit Inrush Current • Output Overvoltage Protection • Over current/Temperature Protection • 10-pin 3mm x 3mm DFN Package TYPICAL APPLICATION DIAGRAM Fig. 1: SP6686 Application Diagram |
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