56 ics 1-1-3 dc/dc converter ics features switching ics/coil combined type requires only 2 discrete components low switching noise no heatsink required built-in overcurrent and thermal protection circuits built-in soft start circuit (output on/off available)...si-8500l series applications ? elephone power supplies onboard local power supplies lineup part number SI-8401L si-8501l v o (v) 5.0 5.0 i o (a) 0.5 1.0 recommended operating conditions parameter dc input voltage range output current range operating temperature range symbol v in i o t op unit v a c absolute maximum ratings unit v w c c symbol v in p d t j t stg parameter dc input voltage power dissipation junction temperature storage temperature ratings si-8400l si-8500l 35 1.25 3 +100 ?5 to +85 ratings SI-8401L 7 to 33 0 to 0.5 ?0 to +85 parameter dc input voltage range output current range operating temperature range symbol v in i o t op unit v a c electrical characteristics unit v % kh z mv mv mv/ c mv p-p a parameter output voltage efficiency oscillation frequency line regulation load regulation te mperature coefficient of output voltage switching ripple v oltage (c 2 =470 f) overcurrent protection starting current symbol v o conditions conditions f conditions ? v oline conditions ? v oload conditions ? v o / ? t a ? v r conditions i s1 conditions (t a =25 c) ratings si-8501l 7 to 33 0 to 1.0 ?0 to +85 ratings SI-8401L min. typ. max. 4.80 5.00 5.20 v in =20v, i o =0.3a 80 v in =20v, i o =0.3a 60 v in =20v, i o =0.3a 80 100 v in =10 to 30v, i o =0.3a 30 40 v in =20v, i o =0.1 to 0.4a 0.5 20 40 v in =20v, i o =0.3a 0.55 v in =10v separate excitation step-down switching mode with coil si-8400l/8500l series unit v % kh z mv mv mv/ c mv p-p a parameter output voltage efficiency oscillation frequency line regulation load regulation te mperature coefficient of output voltage switching ripple v oltage (c 2 =470 f) overcurrent protection starting current symbol v o conditions conditions f conditions ? v oline conditions ? v oload conditions ? v o / ? t a ? v r conditions i s1 conditions (t a =25 c) ratings si-8501l min. typ. max. 4.80 5.00 5.20 v in =20v, i o =0.5a 83 v in =20v, i o =0.5a 60 v in =20v, i o =0.5a 70 130 v in =10 to 30v, i o =0.5a 30 55 v in =20v, i o =0.2 to 0.8a 0.5 45 v in =20v, i o =0.5a 1.1 v in =18v
57 ics si-8400l/8500l series external dimensions (non-package type [ei-12.5 core/ei-19 core]) si-8400l si-8500l si-8400l si-8500l block diagram t ypical connection diagram (unit : mm) t a -p d characteristics v o : output voltage i o : output current ? : efficiency (%) the efficiency depends on the input voltage and the output current. therefore, obtain the value from the efficiency graphs and substi- tute the percentage in the formula above. p d =v o ? o 100 ? ? not encapsulated in a plastic package product mass: approx. 5.1g not encapsulated in a plastic package product mass: approx. 14.5g q e w r v in vo 0.8max. l in gnd (10.16) (7.62) (2.19) (2.17) 14.5 0.5 12 0.5 13.2 0.6 10 0.2 4.7 0.6 pin 1 marking y qwe r sk v in v out ss gnd l in 18 3.7 26 0.1 26 0.1 0.6 418 2 pin1 marking reg. ocp osc reset amp. tsd v ref comp. latch & drive 2 v in v o l in l 1 di 1 mic 1 gnd 41 3 3 2 di 1 mic 1 gnd s.s. 61 4 l 1 reg. ocp osc reset amp. tsd v ref comp. latch & drive v in v o l in v o v in gnd gnd c 1 c 2 220 f 470 f ++ 1 4 3 n.c 2 v out l in gnd si-8400l v in v o v in gnd gnd c 1 c 2 c 3 470 f 470 f ++ 1 6 34 n.c 2 v out l in gnd s.s si-8500l v in c 3 is necessary only for using soft start function. 1.5 1.0 0.5 0 02550 ambient temperature t a ( c) power dissipation p d (w) 75 100 si-8400l 3.0 2.0 1.0 0 025507 5 100 si-8500l ambient temperature t a ( c) power dissipation p d (w)
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