42 ics 1-1-3 dc/dc converter ics unit v mv/ c % khz mv mv a ma a a v v a v/v a/v v/a % nsec. features ?dip8 package ?introduction of current mode control method ?output current: 3.5a ?high efficiency: 90% (vo=5v) ?built-in reference oscillator (350khz) ?built-in drooping-type overcurrent and thermal protection circuits ?built-in soft start circuit ?built-in on/off function (active hi) ?low current consumption during off applications ?dvd recorder, fpd-tv ?onboard local power supplies ?oa equipment absolute maximum ratings unit v w c c c/w c/w ratings 30 1.56 ?0 to +150 ?0 to +150 25 64 symbol v in p d tj tstg j-c j-a parameter input voltage power dissipation *1 junction temperature *2 storage temperature thermal resistance (junction to case) thermal resistance (junction to ambient air) conditions when mounted on glass-epoxy board measuring 70 60 mm (copper laminate area: 1310 mm 2 ) when mounted on glass-epoxy board measuring 70 60 mm (copper laminate area: 1310 mm 2 ) unit v v a c c ratings si-8105ql v o+3 *1 to 28 0.5 to 24 0 to 3.5 ?0 to +125 ?0 to +85 symbol v in vo io tjop to p parameter input voltage range output voltage range output current range operating junction temperature range operating temperature range recommended operating conditions electrical characteristics parameter reference voltage t emperature coefficient of reference voltage efficiency oscillation frequency line regulation load regulation overcurrent protection starting current quiescent circuit current ss pin outflow current at low voltage high level voltage en pin low level voltage inflow current at low voltage error amplifier voltage gain error amplifier transformer conductance current sense amplifier impedance maximum on duty minimum on time symbol v adj conditions ( ? v adj / ? t) conditions conditions fo conditions ? vo line conditions ? vo load conditions is conditions iq conditions iq (off) conditions i ssl conditions v c/eh conditions v c/el conditions i c/eh conditions aea gea 1/gcs dmax dmin *1: limited by thermal protection circuit *2: note that the detect temperature for thermal protection is about 140 c. conditions ratings si-8105ql min. typ. max. 0.485 0.500 0.515 v in =12v, io=1a 0.05 v in =12v, io=1a, ta=?0 to +85 c 90 v in =12v, io=1a 315 350 385 v in =16v, io=1a 30 60 v in =8 to 28v, io=1a 30 60 v in =12v, io=0.1 to 3.5a 3.6 6.0 v in =12v 18 v in =12v, io=0a, v en =open 20 v in =12v, io=0a, v en =0v 5 v in =12v, v ssl =0v 2.8 v in =12v 2.2 v in =12v 5 v en =0v 1000 800 0.35 92 100 *: pin 8 is the ss pin. soft start at power on can be performed with a capacitor connected to this pin. the ss pin is pulled up to the power supply in the ic, so applying the external voltage is prohibited. si-8100ql ss 8 c5 soft start (when ta=25 c and vo=5v) *1: the minimum value of the input voltage range is 4.75 v or vo +3 v, whichever is higher. current mode control step-down switching mode si-8100ql series
43 ics si-8100ql series external dimensions (dip8) (unit : mm) 7 8 2 1 5 4 6 3 9.4 0.3 0.5 0.1 0 to 15 6.5 0.2 3.4 0.1 3.3 0.2 4.2 0.3 7.5 0.5 1.0 +0.3 - 0.05 1.5 +0.3 - 0.05 0.25 +0.1 - 0.05 2.54 7.6 0.25 m 0.89 typ block diagram t ypical connection diagram osc p.reg vref 0.5v 5v_ldo on off 7 en 6 comp 4 gnd 8 ss 1 bs 3 sw 5 fb 2 in uvlo ovp tsd amp 0.5v 5v_ldo drive pwm logic boot reg current sense ocp amp gnd c1 c5 8 7 6 c3 d1 r2 gnd c2 i adj r1 l1 v o c4 r3 c6 open 2 in en ss comp si-8105ql gnd fb sw bs 1 3 5 v in v fb c1:10 f/50v (murata: grm55db31h106ka87) c2:22 f/16v (murata: grm32er71a226ke20) c3:560pf ( murata: grm18 type) c4:10nf ( murata: grm18 type) c5:10nf ( murata: grm18 type) l1:10 h d1:spb-g56s (sanken) sjpb-l4 (sanken) r1:46k ? (when vo = 5 v) r2:5.1k ? r3:24k ? pin assignment 1 bs 2 in 3 sw 4 gnd 5 fb 6 comp 7 en 8 ss plastic mold package type flammability: ul 94v-0 product mass: approx. 0.49 g
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