66 ics 1-1-4 linear regulator ics absolute maximum ratings features compact surface-mount package (sot89-5) output current: 250 ma low current consumption lq (off) 1 a (v c = 0 v) low dropout voltage: v dif 0.5 v (at i o = 250 ma) output voltage range (1.5v to 15v) built-in drooping-type-overcurrent and thermal protection circuits applications auxiliary power supplies for pc battery-driven electronic equipment recommended operating conditions unit v v ma w c c c/w ratings 18 v in 250 0.75 ?0 to +135 ?0 to +125 146 symbol v in v c i o p d *1 t j *2 t stg *2 j-a *1 parameter dc input voltage output control terminal voltage dc output current power dissipation junction temperature storage temperature thermal resistance (junction to ambient air) *1: when mounted on glass-epoxy board 40 40 mm (copper laminate area 2%). *2: thermal protection circuits may operate if the junction temperature exceeds 135 c. parameter input voltage dc output current operating ambient temperature symbol v in i o t op ratings min. max. *2, *3 v o +2 *1 0 250 ?0 85 unit v ma c *1: v in (max) and i o (max) are restricted by the relation p d = (v in - v o ) i o . calculate these values referring to the reference data on page 67. *2: refer to the dropout voltage parameter. *3: for the si-3012lu, set the input voltage to vin 2.4 v, and secure the minimum voltage as explained in "setting dc input voltage" section in linear regulator application note. (t a =25 c) surface-mount, low current consumption, low dropout voltage si-3000lu series electrical characteristics (t a =25 c, v c =2v, unless otherwise specified) *1: is 1 is specified at the 5% drop point of output voltage v o on the condition that v in = 3.3 v, and i o = 10 ma. *2: output is off when the output control terminal (v c terminal) is open. each input level is equivalent to ls-ttl level. therefore, the device can be driven directly by ls-ttls. unit v v mv mv mv/ c db a a ma v a a pa r ameter reference voltage dropout voltage line regulation load regulation t emperature coefficient of reference voltage ripple rejection quiescent circuit current circuit current at output off overcurrent protection starting current *1 control voltage (output on) *2 control voltage (output off) *2 v c control current (output on) te r minal control current (output off) symbol v adj conditions v dif conditions conditions ? v line conditions ? v load conditions ? v o / ? t a conditions r rej conditions i q conditions i q (off) conditions i s1 conditions v c , ih v c , il i c , ih conditions i c , il conditions ratings si-3012lu(variable) min. typ. max. 1.210 1.250 1.290 v in =v o +1v, i o =10ma t j =0 to 100 c 0.3 i o =100ma(v o =3.3v) 0.5 i o =250ma(v o =3.3v) 10 v in =v o +1 to v o +5v, i o =10ma( v o =3.3v) 20 v in =v o +1v, i o =1 to 250ma( v o =3.3v) 0.3 55 v in =v o +1v , f=100 to 120h z ( v o =3.3v) 150 v in =v o +1v, i o =0ma v c =2v, r2=100k ? 1 v in =v o +1v, v c =0v 260 v v c =2v v c =0v in =v o +1v 2.0 0.8 40 0 5
67 ics si-3000lu series external dimensions (sot89-5) pin assignment q adj w gnd e v c r v in t v o plastic mold package type flammability: ul94v-0 product mass: approx. 0.05g (unit : mm) 4.5 0.05 0.1 0.05 0.4 0.03 1.6 0.05 4.2 0.05 4.2 0.05 4.2 0.05 4.2 0.05 4.2 0.05 4.7 0.05 4.3 0.05 2.5 0.05 0.90 0.1 0.90 0.1 0.40 1.5 0.05 1.5 0.05 1.5 0.05 0.4 0.05 ( 1.0 0.05 ) tr qwe block diagram t ypical connection diagram reference data c o : output capacitor (10 f or larger) for si-3000lu series, co has to be a low esr capacitor such as a ceramic capacitor. c in : input capacitor (10 f approx.) setting of si-3012lu output voltage (recommended voltage: 1.5 v to 15 v) r1 and r2: resistors for output setting the output voltage can be set by connecting r1 and r2 as shown in the diagram on the left. r2: 100 k ? is recommended r1=(v o ? adj )/(v adj /r2) si-3012lu ref tsd + v in v c v o gnd 4 3 5 2 adj 1 copper laminate area vs power dissipation t j =100 c pcb size 40 40 si-3012lu 4 3 2 5 1 + v in v in v c v o a dj c in r 1 r 2 gnd load 1 0.9 0.8 0.7 0.6 0.5 0.4 0.3 0.2 0.1 0 10 100 1000 copper laminate area (mm 2 ) power dissipation p d (w) ta=25 c ta=40 c ta=60 c ta=85 c case temperature tc measurement point ? monolithic ics mounts an inner frame stage that is connected to the gnd pin (pin 2). therefore, enlarging the copper laminate area connected to the gnd pin improves heat radiation effect. obtaining the junction temperature measure the temperature t c at the lead part of the gnd pin (pin 2) with a thermocouple, etc. then, substitute this value in the following formula to obtain the junction temperature. t j =p d j?+tc ( j?=5 c/w)
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