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4 u f q? 6 q % $ % $ $ p o w f s u f s . v m u j 7 p m u b h f % f u f d u p s 4 f s j f t 669 10 the xc651a series are step-up dc/dc converter and multi voltage detector ic s. cmos processes and laser trimming technology provide high accuracy and low power consumption. the xc651a comprises of a pfm controlled step-up dc/dc converter, a voltage detector with 4 x 5 level window comparators built-in, plus 2 other voltage detectors. the step-up dc/dc converter's en pin ( chip enable ) provides power consumption savings when the step-up operations are not operating ( stand-by mode ). the series is available in a small tssop-16 package. ( f o f s b m % f t d s j q u j p o independent power supply for each built-in block : each of the following built-in blocks is operated by a separate power supply : pfm controlled, step-up dc/dc converter ( pfm dc/dc ) 5 level window comparator ( mwvd ) negative logic : xc651a3 series positive logic : xc651a4 series voltage detector 1 with built-in delay circuit ( vd1 ) voltage detector 2 ( vd2 ) highly accurate set-up voltage : pfm controlled, step-up dc/dc converter : set-up voltage accuracy 2.5% 5 level window comparator : set-up voltage accuracy 2% voltage detectors 1, 2 : set-up voltage accuracy 2% set-up voltage range : pfm controlled, step-up dc/dc converter : 2.0v ~ 3.0v ( selectable in 0.1v steps) 5 level window comparator : 1.1v ~ 2.5v * ( selectable in 0.1v steps ) voltage detectors 1, 2 : 0.9v ~ 3.0v ( selectable in 0.1v steps ) operational voltage range : 0.9v ~ 6.0v small package : tssop-16 * note : the set-up voltage of the 5 level window comparator cannot be freely set-up due to the limitations of the circuit. please also note that the set-up voltage range of mwvd1 is 1.0v ~ 1.8v. battery powered equipment various portable equipment ' f b u v s f t " q q m j d b u j p o t cmos low power consumption pfm controlled, step-up dc/dc converter 5 level window comparator voltage detector 2 ( independent power supply ) tssop-16 package 4 @ 9 $ " ??
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