supertex inc. lr12 supertex inc. www.supertex.com doc.# dsfp-lr12 c080113 high input voltage, adjustable 3-terminal linear regulator features ? 13.2 to 100v input voltage range ? stable with 100nf output capacitor ? adjustable 1.20 to 88v output regulation ? 5% reference voltage tolerance ? output current limiting, 50ma min. ? 10a typical adj current ? over temperature protection ? available in 3 different packages applications ? dc/dc smps startup circuits ? adjustable high voltage constant current sources ? industrial controls ? motor controls ? battery powered systems ? power supplies ? telecom applications ? led drivers ? automotive applications general descriptionthe supertex lr12 is a high voltage, low output current, adjustable linear regulator. it has a wide operating input voltage range of 13.2 - 100v. the output voltage can be adjusted from 1.20 - 88v, provided that the input voltage is at least 12v greater than the output voltage. the output voltage can be adjusted by means of two external resistors r 1 and r 2 as shown in the typical application circuits. the lr12 regulates the voltage difference between vout and adj pins to a nominal value of 1.20v. the 1.20v is ampliied by the external resistor ratio r 1 and r 2 . an internal constant bias current of typically 10a is connected to the adj pin. this increases v out by a constant voltage of 10a times r 2 . the lr12 has current limiting and temperature limiting. the output current limit is 100ma maximum and the minimum temperature limit is 125c. an output short circuit current will therefore be limited to 100ma maximum. when the junction temperature reaches its temperature limit, the output current and/or output voltage will decrease to keep the junction temperature from exceeding its temperature limit. for smps start-up circuit applications, the lr12 turns off when an external voltage greater than the output voltage of the lr12 is applied to vout of the lr12. to maintain stability, a bypass capacitor of 100nf or larger and a minimum dc output current of 500a are required. lr12 typical application v in 13.2 to 100v * * required for conditions where v in is less than v out . r 1 r 2 c 2 c 1 r load v out 1.2 to 88v lr12 vout adj vin downloaded from: http:///
2 supertex inc. www.supertex.com doc.# dsfp-lr12 c080113 lr12 pin coniguration absolute maximum ratings parameter value v in-adj -0.5v to +120v v out-adj -10v to +10v v in - v out -0.5v to +120v operating ambient temperature -40c to +85c operating junction temperature -40c to +125c storage temperature -65c to +150c power dissipation @ t a = 25 o c to-252 (d-pak) 8-lead soic to-92 2.0w1.8w 0.6w package ja ( o c/w) to-252 81 o c/w 8-lead soic 101 o c/w to-92 132 o c/w sym parameter min typ max units conditions v in - v out input to output voltage difference 12 - 98.8 v --- v out overall output voltage regulation 1.14 1.20 1.26 v 13.2v < v in <100v, r 1 = 2.4k, r 2 = 0 v out line regulation - 0.003 0.03 %/v 15v < v in <100v, v out = 5.0v, i out = 0.5a load regulation - 1.4 3.0 % v in = 15v, v out = 5.0v, 0.5ma< i out <50ma temperature regulation -1.0 - +1.0 % v in = 15v, v out = 5.0v, i out = 10ma, -40 o c < t a < 85 o c electrical characteristics (test conditions unless otherwise speciied: -40 o c < t a < +85 o c) 8-lead soic to-252 (d-pak) product marking yy = year sealed ww = week sealed l = lot number = green packaging yyww lr12 llll yy = year sealedww = week sealed l = lot number = green packagin g si yyww lr12k4 lllllll y = last digit of year sealed w = code for week sealed l = lot number = green packaging si lr 12 y wll to-92 to-252 (d-pak) 8-lead soic package may or may not include the following marks: si or package may or may not include the following marks: si or package may or may not include the following marks: si or to-92 vin adj vout adj nc nc vin vout vout vout vout adj vin vout ordering information part number package options packing LR12K4-G to-252 (d-pak) 2000/reel lr12lg-g 8-lead soic 2500/reel lr12n3-g to-92 1000/bag lr12n3-g p002 to-92 2000/reel lr12n3-g p003 to-92 2000/reel lr12n3-g p005 to-92 2000/reel lr12n3-g p013 to-92 2000/reel lr12n3-g p014 to-92 2000/reel -g denotes a lead (pb)-free / rohs compliant package typical thermal resistance downloaded from: http:///
3 supertex inc. www.supertex.com doc.# dsfp-lr12 c080113 lr12 functional block diagram electrical characteristics (cont.) sym parameter min typ max units conditions i out output current limit 50 - 100 ma t j < 85 o c, v in - v out < 12v - - -0.5 t j < 125 o c, v in - v out < 100v minimum output current 0.5 - - ma includes r 1 and load current i adj adjust output current 5.0 10 15 a --- c2 minimum output loadcapacitance 100 - - nf --- dv out /d vin ripple rejection ratio 50 60 - db 120hz, v out = 5.0v t limit junction temperature limit 125 - - o c --- overtemp & overcurrent 10a 1.2v vin vout adj lr12 pass element 6.5v 1.0k current limit -40 -20 0 20 40 60 80 100 100 90 80 70 60 50 temperature ( o c) i c (ma) downloaded from: http:///
4 supertex inc. www.supertex.com doc.# dsfp-lr12 c080113 lr12 figure 3: high voltage adjustable constant current source figure 2: smps start-up circuit typical application circuits fb lr12 v in = 15 to 100v v out 1 v out 2 + + - - v cc v aux vout adj vin pwm ic r i out = 1.20v r + - 100nf v in = 15 - 100v vout adj vin lr12 figure 1: high input voltage, 5.0v output linear regulator * required for conditions where v in is less than v out . lr12 v in = 17 - 100v * r 2 18.2k?1% c 2 100nf c 1 v out = 5.0v v out = 1.20v + i adj r 2 1+ r 2 r 1 vout adj vin r load 16.5k r 1 6.04k?1% downloaded from: http:///
5 supertex inc. www.supertex.com doc.# dsfp-lr12 c080113 lr12 typical performance curves 13.2v 2.4k 100nf v out = 1.2v vout adj vin lr12 v out (v) t (junction) ( o c) temperature variation -50 -25 0 25 50 75 100 125 1.30 1.25 1.20 1.15 1.10 1.05 1.00 6.04k 1% 18.2k?1% 100nf r load 25v i out v out = 5.0v lr12 vout adj vin v out (v) i out (ma) load regulation 0 5 10 15 20 25 30 35 40 45 50 5.305.25 5.20 5.15 5.10 5.05 5.00 4.95 4.90 4.85 4.80 downloaded from: http:///
6 supertex inc. www.supertex.com doc.# dsfp-lr12 c080113 lr12 typical performance curves (cont.) 6.04k 1% 18.2k?1% 100nf 1.0k 0v to 50v v out = 5.0v vout adj vin lr12 v out vs. v in v out (v) v in (v) 0 20 40 60 80 100 6.0 5.0 4.0 3.0 2.0 1.0 0 6.04k 1% 18.2k 1% 100nf r load 65v i out 20v p-p @ 120hz v out = 5.0v vout adj vin lr12 ripple rejection ripple rejection ratio (db) i out (ma) 0 10 20 30 40 50 -65 -64 -63 -62 -61 -60 downloaded from: http:///
7 supertex inc. www.supertex.com doc.# dsfp-lr12 c080113 lr12 typical performance curves (cont) 25v 18.2k 1% 100nf sw 100nf 10k 0v 100v v in 0v v in lr12 vout adj vin v ou t = 5.0v 6.04k 1% 10k 509 lr12 vout adj vin 18.2k?1% 6.04k?1% load transient response line transient response line power up transient line power down transient load transient response, load = 509 line turn on/off response downloaded from: http:///
8 supertex inc. www.supertex.com doc.# dsfp-lr12 c080113 lr12 3-lead to-252 (d-pak) package outline (k4) note: 1. although 4 terminal locations are shown, only 3 are functional. lead number 2 was removed. 1 2 3 4 l4 l5 b b2 e d1 e1 l1 l seating plane a1 gaugeplane d e vi ew b front view side view rear view vi ew b 1 h c2 a l3 l2 b3 note 1 symbol a a1 b b2 b3 c2 d d1 e e1 e h l l1 l2 l3 l4 l5 1 dimen- sion (inches) min .086 .000* .025 .030 .195 .018 .235 .205 .250 .170 .090 bsc .370 .055 .108 ref .020 bsc .035 .025* .045 0 o 0 o nom - - - - - - .240 - - - - .060 - - - - - max .094 .005 .035 .045 .215 .035 .245 .217* .265 .182* .410 .070 .050 .040 .060 10 o 15 o jedec registration to-252, variation aa, issue e, june 2004. * this dimension is not speciied in the jedec drawing. drawings not to scale. supertex doc. #: dspd-3to252k4, version e091009. downloaded from: http:///
9 supertex inc. www.supertex.com doc.# dsfp-lr12 c080113 lr12 8-lead soic (narrow body) package outline (lg) 4.90x3.90mm body, 1.75mm height (max), 1.27mm pitch 1 8 seating plane gauge plane l l1 l2 e e1 d e b a a2 a1 seating plane a a top vi ew side view vi ew b view b 1 note 1 (index area d/2 x e1/2) vi ew a-a h h note 1 symbol a a1 a2 b d e e1 e h l l1 l2 1 dimension (mm) min 1.35* 0.10 1.25 0.31 4.80* 5.80* 3.80* 1.27 bsc 0.25 0.40 1.04 ref 0.25 bsc 0 o 5 o nom - - - - 4.90 6.00 3.90 - - - - max 1.75 0.25 1.65* 0.51 5.00* 6.20* 4.00* 0.50 1.27 8 o 15 o jedec registration ms-012, variation aa, issue e, sept. 2005. * this dimension is not speciied in the jedec drawing. drawings are not to scale. supertex doc. #: dspd-8solgtg, version i041309. note: 1. this chamfer feature is optional. a pin 1 identiier must be located in the index area indicated. the pin 1 identiier can be: a molded mark/identiier; an embedded metal marker; or a printed indicator. downloaded from: http:///
10 supertex inc. does not recommend the use of its products in life support applications, and will not knowingly sell them for use in such applications unless it receives an adequate ?product liability indemnification insurance agreement.? supertex inc . does not assume responsibility for use of devices described, and limits its liabilit y to the replacement of the devices determined defective due to workmanship. no responsibility is assumed for possible omissions and inaccuracies. circuitry and specifications are subject to change without notice. for the latest product specifications refer to the supertex inc . (website: http//www .supertex.com) ?2013 supertex inc. all rights reserved. unauthorized use or reproduction is prohibited. supertex inc. 1235 bordeaux drive, sunnyvale, ca 94089 t el: 408-222-8888 www.supertex.co m lr12 (the package drawing(s) in this data sheet may not relect the most current speciications. for the latest package outline information go to http://www.supertex.com/packaging.html .) doc.# dsfp-lr12 c080113 3-lead to-92 package outline (n3) symbol a b c d e e1 e e1 l dimensions (inches) min .170 .014 ? .014 ? .175 .125 .080 .095 .045 .500 nom - - - - - - - - - max .210 .022 ? .022 ? .205 .165 .105 .105 .055 .610* jedec registration to-92. * this dimension is not speciied in the jedec drawing. ? this dimension differs from the jedec drawing. drawings not to scale. supertex doc.#: dspd-3to92n3, version e041009. seatingplane 1 2 3 front view side view bottom view e1 e d e1 l e c 1 2 3 b a downloaded from: http:///
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