80 ics 1-1-2 switching mode regulator ics features ?input voltage (vin): 3.0 to 5.5 v ?synchronous rectification ?output voltage precision 1.2% ?oscillation frequency: 250 khz ?overcurrent protection (overcurrent value can be set by the external resistor.) ?output can be disabled ?undervoltage lock out ?soft start function ?high-speed load response absolute maximum ratings unit v v c c ratings 6 ?.3 to v in +125 ?0 to +150 symbol v in v en t j t stg par ameter input voltage (v in pin) en/ss pin input voltage j unction temperature storage temperature applications ?power supply for lcd modules ?power supply for notebook pc ?onboard local power supplies ?power supply for lbp/ppc unit v v c ratings 3 to 5.5 0.5 to 4 ?0 to +85 symbol v in v o t op par ameter input voltage range output voltage range operating temperature range recommended operating conditions electrical characteristics unit v ma a s ? ? ? ? mv a v v v v v par ameter reference voltage circuit current (v in pin) standby current (v in pin) on time high side drive block on resistance (pulled up) high side drive block on resistance (pulled down) low side drive block on resistance (pulled up) low side drive block on resistance (pulled down) overcurrent detection voltage en/ss pin current en/ss low level voltage en/ss threshold voltage undervoltage lock out (v in ) symbol v ref conditions i op conditions i std conditions t on conditions r on hh conditions r on hl conditions r on lh conditions r on ll conditions v lim conditions i ss conditions v celo conditions v th(ss start) conditions v th(on) conditions v uvloh v uvlol (t a =25 c) ratings min. typ. max. 0.494 0.500 0.506 v in =5v, v en =5v 5 v in =5v, v en =h 400 600 v in =5v, v en =l 2 v in =5v, vo=2.5v 3.5 v in =5v, i d =0.1a 3.5 v in =5v, i d =0.1a 3.5 v in =5v, i d =0.1a 3.5 v in =5v, i d =0.1a 40 50 60 v in =5v 71 01 3 v in =5v 0 0.8 v in =5v 0.8 0.9 1.0 v in =5v 2.4 v in =5v 2.9 2.4 surface-mount, synchronous rectifier step-down switching mode regulator control ics SI-8405NL
81 ics SI-8405NL external dimensions (sop8) (unit : mm) 0.995max. 0.10 1.27 0.4 0.1 0.4 0.1 0.15 +0.1 5.1 0.4 1.27 8765 1234 4.4 0.2 1.5 0.1 1.55 0.15 0.05 0.05 0~10 0.5 0.1 6.2 0.3 ?.05 0.12 m pin assignment q v in w en/ss e v o r v sens t gnd y drvl u drvh i i sen plastic mold package type flammability : ul 94v-0 product mass : approx. 0.1 g block diagram t ypical connection diagram ss/en ss_con vref zep on-timing generator comp vsns vo gnd drvl drvh isen vin h_side_ drive synchronous include dead-time gate drv h_drv l_drv l_side_ drive vref 1 0.5v uvlo uvlo en ocp + + en vin si-8400n en/ss vsns vo isen drvh drvl gnd 2 4 r2 r3 3 c3 8 c4 c1 vin 1 r1 r4 q1 l1 d1 c2 + vo q2 7 6 5 c 1 :10 f c 2 : 330 f c 3 : 0.022 f c 4 : 0.068 f l 1 :10 h d 1 : sjpj-l4 (sanken)
|
