preliminary and all contents are subject to change without prior notice 1 white led step-up converter (preliminary) CYT2506 description the CYT2506 is a step-up dc/dc converter specifically designed to drive white leds with a constant current. the device can drive two, three or four leds in series from a li-ion cell. series connection of the leds provides identical led current resulting in uniform brightness and eliminating the need for ballast resistors. the CYT2506 switches at 1.2mhz , allowin g the use of any tiny external components. the output capacitor can be as small as 0.22f, saving space and cost versus alternative solutions. a low 95mv feedback voltage minimizes power loss in the current setting resistor for better efficiency. CYT2506 is available in low profile sc70 and sot packages. features ? inherently matched led current. ? high efficiency: 84% typical. ? drives up to four leds from a 3.2v supply. ? drives up to six leds from a 5v supply. ? fast 1.2mhz switching frequency. ? uses tiny 1mm tall inductors. ? requires only 0.22f output capacitor. ? low profile sc70 and sot packaging. pin configuration 5 lead tsot-23 6 lead sc70 application ? cellular phones ? pdas, handheld computuers ? digital camera ? mp3 players ? gps receivers application diagram
preliminary and all contents are subject to change without prior notice 2 white led step-up converter (preliminary) CYT2506 outline drawing sot-23-5l b k a f d e c h j mi n max mi n max a 0.110 0.120 2.80 3.05 b 0.059 0.070 1.50 1.75 c 0.036 0.051 0.90 1.30 d 0.014 0.020 0.35 0.50 e -0.037 - 0.95 f -0.075 - 1.90 h -0.006 - 0.15 j 0.0035 0.008 0.090 0.20 k 0.102 0.118 2.60 3.00 di m n i nches mm di mensi ons
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