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XRP6840BILBTR-F Datasheet(PDF) 1 Page - Exar Corporation |
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XRP6840BILBTR-F Datasheet(HTML) 1 Page - Exar Corporation |
1 / 17 page X XR RP P6 68 84 40 0 4 4..3 3A A S Su up pe errcca ap pa acciitto orr F Flla as sh h L LE ED D D Drriiv ve err w wiitth h II22C C December 2009 Rev. 1.0.0 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 XRP6840 is a controlled-current dual-cell supercapacitor charger and high power LED driver. Operating from a standard lithium-ion battery, the XRP6840 provides up to 4.3A of programmable Flash LED current and up to 600mA and 5.6V of programmable supercapacitor charging current and voltage. Architectured around a 2.4MHz tri-mode 1x, 1.5x and 2x charge pump, the XRP6840 charges the stacked supercapacitor to the programmed output voltage with no more than 600mA drawn from the battery. While charging, an internal active balance circuitry insures matching of the stacked capacitors’ voltages. A standard 2-line I2C serial interface allows the dynamic programming of LED currents in torch and flash modes, flash timeout, channel enable, gain control, capacitor charge voltage, and enable. The XRP6840 comes in a 2 and 3 channel version supporting respectively 440mA/2.15A per channel and 300mA/1.45A in torch/flash modes. The flexibility designed into the XRP6840 can also allow it to reverse the power flow back to the input to prevent unintended system resets as the battery voltage drops. The XRP6840 is available in a lead-free, “green”/halogen free 20-pin TQFN package. APPLICATIONS • High Power Torch/Strobe/Flash LED • High Resolution Cameras • Generic High Power Lighting • High Power White LED Backlighting FEATURES • Programmable 4.3A Flash LED Driver − Torch and Flash Modes − 2 and 3 Channels Versions • Programmable Supercapacitor Charger − 600mA Adjustable Charging Current − Programmable Supercapacitor Voltage − In-rush Current Control − Active Voltage Balance Control • Tri-mode Charge Pump Architecture − 1x, 1.5x, 2x Operation Modes − 2.4MHz Switching Frequency • I2C Serial Interface • Thermal, Over Current and Output Short Protection • LED Short Detection • RoHS Compliant “Green”/Halogen Free 20-pin 4mmx4mm TQFN package TYPICAL APPLICATION DIAGRAM Fig. 1: XRP6840 – 3 Channels Application Diagram |
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Similar Description - XRP6840BILBTR-F |
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