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SP6685 Datasheet(PDF) 1 Page - Exar Corporation |
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SP6685 Datasheet(HTML) 1 Page - Exar Corporation |
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1 / 14 page  S SP P6 66 68 85 5 7 70 00 0m mA A B Bu uc ck 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 June 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 SP6685 is a current-regulated charge pump ideal for powering high brightness LEDs for camera flash applications. The charge pump can be set to regulated 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 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 Cell Phone, DSCs and Camcorders • White LED Backlighting • Generic Lighting/Flash Application • General Purpose High Current Boost FEATURES • Output Current up to 700mA • Up to 94% Efficiency in Torch Mode • Minimum External Components: No Inductor • Adjustable FLASH Mode Current • 1x and 2x Charge Pump Operation • 2.4MHz High Frequency Operation • IQ < 1µA in Shutdown • Built-In Soft Start Limit Inrush Current • Output Overvoltage Protection • Over current/Temperature Protection • 10pin 3x3mm DFN Package TYPICAL APPLICATION DIAGRAM Fig. 1: SP6685 Application Diagram |
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