cystech electronics corp. spec. no. : c525j3 issued date : 2003.04.02 revised date :2005.07.15 page no. : 1/3 LM7812XJ3 cystek product specification 3-terminal positive voltage regulator LM7812XJ3 description the LM7812XJ3 series of three- terminal positive regulators are available in the to-252 package. t hese regulators can provide local on-card regulation, eliminating t he distribution problems associated with single point regulation. each em ploys internal current limiting, thermal shutdown and safe operating area protecti on, making it essentially indestructible. if adequate heat sinking is provided, they c an deliver over 1a output current. although designed primarily as fixed voltage regulators, these devices can be used with external components to obtain adjust able voltages and currents. LM7812XJ3 is characterized for operation from 0 c to +125 c, and if operating temperature is always high, please refer to the power dissipation curve. absolute maximum ratings (ta=25 c) ? input volt age ................................................................................................................. ...... 35 v ? total power dissipation .................................................................................... interna lly limited ? operating temper ature r ange .......................................................................... 0 c to +125 c ? maximum junction temperatur e ..................................................................................... 125 c ? storage temperat ure range .......................................................................... -55 c to +150 c ? lead temperature (s oldering 10 s).................................................................................. 230 c typical application schematic diagram 6.3v 3.4k 200 10k 200 1k 2k 0.3 26 4k 20pf 4k 1k 12.1k 1.2 26 1.9k 30k vref input output gnd lm7812 vout vin 3 1 2 c1 c2 note: c1 and c2 are required if regulator is located far from power supply filter and load, or oscillation may induced on the loop. to-252
cystech electronics corp. spec. no. : c525j3 issued date : 2003.04.02 revised date :2005.07.15 page no. : 2/3 LM7812XJ3 cystek product specification electrical characteristics vin=19v, io=500ma, 0 c tj 125 c (unless otherwise noted) lm7812a symbol parameter conditions min typ max units tj=25 c 11.64 12 12.36 vo output voltage 14.5v vin 27v 11.64 12 12.36 v tj=25 c, 14.5v vin 30v - 20 120 ? vo line regulation tj=25 c, 16v vin 22v - 16 60 mv 5ma io 1.5a - - 120 ? vo load regulation 250ma io 750ma - - 60 mv iq quiescent current io 1a, tj=25 c - 5.5 8 ma 5ma io 1a - - 0.5 ? iq quiescent current change 14.5v vin 30v - - 1.3 ma vn output noise voltage ta = 2 5 c, 10hz f 100khz - - 200 v rr ripple rejection 15v vin 25v, f=120hz - 68 - db vd dropout voltage tj=25 c, io=1a - 2 - v isc short circuit current tj=25 c - 1.5 - a ipk peak output current tj=25 c 1.7 - - a ? vo / ? t average tc of vout 0 c tj +125 c, io=5ma - -0.8 - mv/ c lm7812b symbol parameter conditions min typ max units tj=25 c 11.5 12 12.5 vo output voltage 14.5v vin 27v 11.4 12 12.6 v tj=25 c, 14.5v vin 30v - 44 240 ? vo line regulation tj=25 c, 16v vin 22v - 16 120 mv 5ma io 1.5a - 45 240 ? vo load regulation 250ma io 750ma - 16 120 mv iq quiescent current io 1a, tj=25 c - 5.5 8 ma 5ma io 1a - - 0.5 ? iq quiescent current change 14.5v vin 30v - - 1.3 ma vn output noise voltage ta = 2 5 c, 10hz f 100khz - - 300 v rr ripple rejection 15v vin 25v, f=120hz 62 73 - db vd dropout voltage tj=25 c, io=1a - 2.5 - v isc short circuit current tj=25 c - 1.5 - a ipk peak output current tj=25 c 1.7 - - a ? vo / ? t average tc of vout 0 c tj +125 c, io=5ma - -0.8 - mv/ c
cystech electronics corp. spec. no. : c525j3 issued date : 2003.04.02 revised date :2005.07.15 page no. : 3/3 LM7812XJ3 cystek product specification to-252 dimension *: typical inches millimeters inches millimeters dim min. max. min. max. dim min. max. min. max. a 0.0177 0.0217 0.45 0.55 g 0.0866 0.1102 2.20 2.80 b 0.0650 0.0768 1.65 1.95 h - *0.0906 - *2.30 c 0.0354 0.0591 0.90 1.50 i - 0.0354 - 0.90 d 0.0177 0.0236 0.45 0.60 j - 0.0315 - 0.80 e 0.2520 0.2677 6.40 6.80 k 0.2047 0.2165 5.20 5.50 f 0.2125 0.2283 5.40 5.80 l 0.0551 0.0630 1.40 1.60 notes: 1.controlling dimension: millimeters. 2.maximum lead thickness includes lead finish thickness, and minimum lead thickness is the minimum thickness of base material. 3.if there is any question with packing spec ification or packing method, please cont act your local cystek sales office. material: ? lead: 42 alloy; solder plating ? mold compound: epoxy resin family, flammability solid burning class: ul94v-0 important notice: ? all rights are reserved. reproduction in whole or in part is prohibited without the prior written approval of cystek. ? cystek reserves the right to make changes to its products without notice. ? cystek semiconductor products are not warranted to be suitab le for use in life-support applications, or systems. ? cystek assumes no liability for any consequence of customer pr oduct design, infringement of pat ents, or application assistance . b a c e h i j k 3 2 1 d f g l style: pin 1.vin 2.ground 3.vout 3-lead to-252 plastic surface mount package cystek package code: j3 marking: 7812
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