24 ratings 35 v in 0.27 *1 14(with infinite heatsink) 1.5(without heatsink, stand-alone operation) C 40 to +125 C 30 to +100 C 40 to +125 7.0 66.7(without heatsink, stand-alone operation) paarameter dc input voltage voltage of output control terminal dc output current power dissipation junction temperature ambient operating temperature storage temperature thermal resistance (junction to case) thermal resistance (junction to ambient air) unit v v a w w c c c c/w c/w symbol v in v c i o p d1 p d2 t j t op t stg r th(j-c) r th(j-a) si-3000b series 5-terminal, multi-function, full-mold, low dropout voltage dropper type si-3000b series features ? compact full-mold package (equivalent to to220) ? output current: 0.27a ? low dropout voltage: v dif 0.5v (at i o =0.27a) ? output on/off control terminal is compatible with ls-ttl. (it may be directly driven by ls-ttl or standard cmos logic.) ? built-in foldback overcurrent, thermal protection circuits ? accurate overcurent protection starting current si-3157b : 0.3 to 0.7a (v in =18v) SI-3025B : 0.3 to 0.7a (when v in =18v, at v o =15.7v) 0.3 to 0.75a (when v in =18v, at v o =11.7v) ? variable output voltage type (SI-3025B) also available applications ? for bs and cs antenna power supplies ? electronic equipment absolute maximum ratings (t a =25 c)
25 parameter input voltage output voltage (SI-3025B: reference voltage) dropout voltage line regulation load regulation temperature coefficient of output voltage (SI-3025B: temperature coefficient of reference voltage) ripple rejection quiescent circuit current overcurrent protection starting current *3,4 control voltage (output on) control voltage (output off) v c control current terminal *5 (output on) control current (output off) si-3000b series electrical characteristics *1: v in(max) and i o(max) are restricted by the relation p d(max) =(v in -v o ) ? i o =14(w). *2: refer to the dropout voltage.(refer to setting dc input voltage on page 7.) *3: i s 1 is specified at C 5(%) drop point of output voltage v o on the condition that v in =v o +3v, i o =0.2a. *4: a foldback type overcurrent protection circuit is built into the ic regulator. therefore, avoid using it for the following applications as it may cause starting errors: (1) constant current load (2) plus/minus power (3) series power (4) v o adjustment by raising ground voltage *5: output is on even when output control terminal v c is open. each input level is equivalent to ls-ttl. therefore, it may be directly driven by an ls-ttl circuit. *6. when setting output voltage to 5v or less, input voltage needs to be set to 6v or over to operate stably. symbol v in v o (v ref ) conditions v dif conditions ? v oline conditions ? v oload conditions ? v o / ? t a ( ? v ref / ? t a ) conditions r rej conditions i q conditions i s1 conditions conditions v c. ih v c. il i c. ih conditions i c. il conditions ratings (t a =25 c unless otherwise specified) si-3157b min. typ. max. *2 27 *1 14.92 15.70 16.48 v in =18v, i o =0.2a 0.5 i o 0.27a 30 90 v in =17 to 27v, i o =0.2a 120 300 v in =18v, i o =0 to 0.27a 1.5 v in =18v, i o =5ma, t j =0 to 100 c 54 v in =18v, f=100 to 120h z 310 v in =18v, i o =0a 0.3 0.7 v in =18v 2.0 0.8 20 v c =2.7v C 0.3 v c =0.4v unit v v v mv/ c db ma a v a ma SI-3025B min. typ. max. 6 *2,6 27 *1 2.448 2.550 2.652 v in =v o +3v, i o =0.2a 0.5 i o 0.27a 10 v in =(v o +1) to 27v, i o =0.27a 10 v in =v o +3v, i o =0 to 0.27a 0.5 v in =v o +3v, i o =5ma, t j =0 to 100 c 54 v in =v o +3v, f=100 to 120h z 310 v in =v o +3v, i o =0a 0.3 0.75 v in =18v, at v o =11.7v 0.3 0.7 v in =18v, at v o =15.7v 2.0 0.8 20 v c =2.7v C 0.3 v c =0.4v mv (3025b: mv/v) mv (3025b: mv/v)
26 external dimensions block diagram si-3157b SI-3025B 1 2 5 reg. on/off protection drive amp. v ref 3 4 mic t r1 equivalent to ls-ttl 1 2 5 reg. on/off protection drive amp. v ref 3 4 mic t r1 equivalent to ls-ttl (unit:mm) si-3000b series 10.0 0.2 4.2 0.2 0.95 0.15 8.2 0.7 2.6 0.1 3.9 0.7 (4.3) (4.6) (8.0) (17.9) (2.0) 0.85 +0.2 C 0.1 0.45 +0.2 C 0.1 3.2 0.2 4.0 0.2 7.9 0.2 5.0 0.6 16.9 0.3 0.5 12345 p1.7 0.7 4=6.8 0.7 2.8 0.2 a b forming no. 1101 a. part number b. lot number pin arrangement si-3157b SI-3025B q gnd q gnd w v c w v c e v o e v o r v os r v ref t v in t v in plastic mold package type flammability: ul94v-0 weight: approx. 2.3g
27 si-3157b t a -p d characteristics standard external circuit SI-3025B d 1 c 0 c 2 c 1 dc input dc output v in v o gnd gnd 5 si-3157b open 2 3 4 1 * 1 * 2 ++ d 1 c 0 r 1 r 2 c 2 c 1 dc input dc output v in v o gnd gnd 5 open 2 3 4 1 SI-3025B * 1 * 3 * 3 * 2 ++ c 0 : output capacitor (47 to 100 f) *1 c 1 : oscillation prevention capacitor c 2 (c 1 : approx. 47 f, c 2 : 0.33 f) these capacitors are required if the input line is inductive and in the case of long wiring. tantalum capacitors are rec- ommended for c 1 and c 0 , particularly at low temperatures. *2 d 1 : protection diode this diode is required for protection against reverse biasing of the input and output. sanken eu2z is recommended. *3 r 1 : external resistor for setting output voltage r 2 relationship between output voltage v o and external resis- tors r 1 and r 2 is as follows. v o =v ref ? 1+ r 1 (v ref =2.55v(typ.)) r 2 r 2 must be 2.55k ? for stable operation. p d =i o ? [v in (mean) C v o ] si-3000b series 15 10 5 0 C 30 02550 ambient temperature t a ( c) power dissipation p d (w) 75 100 200 200 2mm (2.3 c/w) 100 100 2mm (5.2 c/w) 75 75 2mm (7.6 c/w) infinite heatsink without heatsink with silicon grease heatsink: aluminum
28 typical characteristics (at v o =15.7v for si3025b) i o vs. v dif characteristics temperature coefficient of output voltage(si-3157b) output voltage(si-3157b) line regulation load regulation overcurrent protection characteristics(si-3157b) output on/off control thermal protection characteristics note on thermal protection: the thermal protection circuit is intended for protection against heat during instantaneous short-circuiting. its operation is not guaran- teed for continuous heating condition such as short-circuiting over extended periods of time. 0 0.05 0.1 0.15 0.2 0.25 0.3 0.5 0.4 0.3 0.2 0.1 0 output current i o (a) dropout voltage v dif (v) C 40 0 C 20 40 20 80 60 140 100 120 16.0 15.9 15.8 15.7 15.6 15.5 15.4 15.3 ambient temperature t c ( c) output voltage v o (v) v in =18v l o =0a 14 18 16 22 20 24 26 28 16.1 15.9 15.7 15.5 15.3 15.1 14.9 input voltage v in (v) output voltage v o (v) l o =0a 0.1a 0.2a 0.27a 00.1 0.05 0.15 0.2 0.25 0.3 16.1 15.9 15.7 15.5 15.3 15.1 14.9 output current i o (a) output voltage v o (v) v in =27v 25v 22v 18v 16.5v 0 0.1 0.3 0.4 0.2 0.5 0.6 0.7 20 15 10 5 0 output current i o (a) output voltage v o (v) 18v 22v 25v v in =27v v in =16.5v 0123 4 20 15 10 5 0 output on/off control v c (v) output voltage v o (v) v in =18v l o =0a 040 20 100 80 60 140 160 120 180 20 15 10 5 0 case temperature t c ( c) output voltage v o (v) v in =18v l o =10ma (t a =25 c) si-3000b series 05 15 10 25 20 30 20 15 10 5 0 input voltage v in (v) output voltage v o (v) l o =0a 0.1a 0.2a 0.27a
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