fujitsu semiconductor fact sheet november 2011 1/2 copyright?2011 fujitsu semiconduct or limited all rights reserved np405-00001-5v0-e assp for power supply applications 6mhz synchronous rectification buck-boost dc/dc converter ic mb39c326 mb39c326 was designed for the rf power amplifier of the mobile device that used 1-cell li-ion battery. it is high-efficiency and low noise 6 mhz buck-boost dc/dc co nverter ic. the size of the inductor can be greatly reduced to 2-3mhz existing product by operating by the high frequency of 6mhz. therefore, it becomes possible to reduce the substrate area of the power supply part by half. the range of the voltage that can be used can be expanded by automatic switching operation of the buck-boost circuit, and a steady power supply to the power amplifier can be supplied. description ? high efficiency : up to 95% ? input voltage range : 2.5 v to 5.5 v ? adjustable output voltage range : 0.4 v to 5.0 v ? input current limit value : 2 a/1a/0.5a ? output current : 1200ma (buck, output at 3.3v) : 800ma (boost, output at 3.3v) ? 6mhz pwm operation allows 0.5 h small form inductor ? less than 20 s step response for 3g ? automatic transition between buck mode and boost mode ? selectable output voltage with external resistor ? built-in over temperature protection circuit ? built-in under voltage lockout protection circuit ? package : 20pin, wl-csp(2.15mm 1.94 mm 0.625mm) applications ? products that use 1-cell lithium batteries for the power supply ? rf power amplifier ? cell-phone ? rf-pc card, pda package : 20-pin plastic wl-csp
mb39c326 np405-00001-5v0-e november 2011 2/2 copyright?2011 fujitsu semiconduct or limited all rights reserved pin assignments block diagram ordering information part number packege remarks mb39c326pw 20-pin plastic wl-csp (wlp-20p-m01) 0.4 mm-ball-pitch 2.151.94 mm - the contents of this document are subject to change without notice.
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