EUP2586 ds2586 ver1.0 feb. 2012 1 small package, high performance, asynchronies boost for wled driver description the EUP2586 is a high frequency, asynchronous boost converter designed for driving white led arrays. wi th integrated 0.19 power switch and 2a current limit, the EUP2586 provides enough driving capability for 7 ~10 lcd backlighting(13 strings of 3 or 4 leds each). the device uses current mode, fixed frequenc y architecture to regulate the led current, which is measured through an external current sense resistor . its low 200mv feedback voltage reduces power loss and improves efficiency. with the built-in over-voltage protection function (ovp), the sw pin monitors the output voltage and turn off the device if an over-voltage condition is present due to an open circuit condition. other fea tures include soft start, over-current limiting, thermal protection and under-voltage lockout. the EUP2586 is available in the tiny tsot23-5 package to provide the best solution for pcb space saving and total bom cost. features 2.6v to 5.5v input range internal 0.19 , 18v mosfet switch high efficiency up to 93% lower surface temperature at iled=180ma 1mhz switching frequency 2a current limit open led overvoltage protection internal soft-start pwm and dc dimming control available in tsot23-5 package rohs compliant and 100% lead (pb)-free halogen-free applications 7 to 10 lcd panels mid backlighting netbook backlighting portable media players gps navigation systems typical application circuit figure 1. EUP2586 pwm dimming application for white led drive r
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