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1 lt1020 micropower regulator and comparator s f ea t u re n 40 m a supply current n 125ma output current n 2.5v reference voltage n reference output sources 1ma and sinks 0.5ma n dual output comparator n comparator sinks 10ma n dropout detector n 0.2v dropout voltage n thermal limiting n available in so package u s a o pp l ic at i n battery systems n battery backup systems n portable terminals n portable instruments the lt1020 is a combination micropower positive regula- tor and free collector comparator on a single monolithic chip. with only 40 m a supply current, the lt1020 can supply over 125ma of output current. input voltage range is from 4.5v to 36v and dropout voltage is 0.6v at 125ma. dropout voltage decreases with lower load currents. also included on the chip is a class b output 2.5v reference that can either source or sink current. a dropout detector provides an output current to indicate when the regulator is about to drop out of regulation. the dual output comparator can be used as a comparator for system or battery monitoring. for example, the com- parator can be used to warn of low system voltage while the dropout detector shuts down the system to prevent abnormal operation. frequency compensation of the com- parator for amplifier applications can be obtained by adding external output capacitance. dual output or posi- tive and negative regulators can also be made. the 2.5v reference will source or sink current. this allows it to be used as a supply splitter or auxiliary output. d u escriptio u a o pp l ic at i ty p i ca l 5v regulator dropout voltage and supply current + v in > 5.2v i q = 40 m a 10 m f 10 m f 0.001 m f 1m 1m 5v 2 11 3 9 v in v out fb gnd + lt1020 1020 ta01 output current (ma) 0.1 0.01 dropout voltage (v) 0.1 1 10 1000 1020 ta02 1 100 0.1 1 10 supply current (ma)
2 lt1020 a u g w a w u w a r b s o lu t exi t i s input voltage .......................................................... 36v npn collector voltage ............................................ 36v pnp collector voltage.............................. supply C 36v output short circuit duration ......................... indefinite power dissipation .............................. internally limited storage temperature range ................ C 65 c to 150 c operating temperature range lt1020c ............................................. 0 c to 100 c lt1020i ........................................ C 40 c to 100 c lt1020m ....................................... C 55 c to 125 c lead temperature (soldering, 10 sec).................. 300 c wu u package / o rder i for atio t jmax = 150 c, q ja = 80 c/w (j) t jmax = 110 c, q ja = 130 c/w (n) t jmax = 110 c, q ja = 150 c/w order part number t j = 25 c e lectr ic al c c hara terist ics parameter conditions min typ max units reference reference voltage 4.5v v in 36v 2.46 2.50 2.54 v line regulation 4.5v v in 36v 0.01 0.015 %/v load regulation C 0.5ma i ref 1ma, v in = 12v 0.2 0.3 % output source current v in = 5v 1 4 ma output sink current v in = 5v 0.5 2 ma temperature stability 1% regulator supply current v in = 6v, i out 100 m a4580 m a v in = 36v, i out 100 m a 75 120 m a v in = 12v, i out = 125ma 11 20 ma output current (v in C v out ) 3 1v, v in 3 6v 125 ma load regulation (v in C v out ) 3 1v, v in 3 6v 0.2 0.5 % line regulation 6v v in 36v 0.01 0.015 %/v dropout voltage i out = 100 m a 0.02 0.05 v i out = 125ma 0.4 0.65 v feedback sense voltage v in = 12v 2.44 2.5 2.56 v dropout detector current d v out = C 0.05v, i out = 500 m a320 m a lt1020cj lt1020cn LT1020IJ lt1020in lt1020mj order part number lt1020cs lt1020is 1 2 3 4 5 6 7 top view j package 14-lead ceramic dip n package 14-lead plastic dip 14 13 12 11 10 9 8 nc v out v in ref out comp pnp comp npn +input nc shutdown feedback gnd input dropout detector current limit top view s package 16-lead plastic soic 1 2 3 4 5 6 7 8 16 15 14 13 12 11 10 9 nc v out vi n ref out comp pnp comp npn +input nc nc shutdown feedback gnd input nc dropout detector current limit
3 lt1020 t j = 25 c e lectr ic al c c hara terist ics e lectr ic al c c hara terist ics parameter conditions min typ max units regulator feedback bias current 15 40 na minimum load current v in = 36v 1 5 m a short-circuit current v in = 36v 300 400 ma pins 9 and 10 shorted, v in = 4.5v 3 30 ma comparator offset voltage 0v v cm 35v, v in = 36v 3 7 mv bias current 0v v cm 35v, v in = 36v 15 40 na offset current 0v v cm 35v, v in = 36v 4 15 na gain-npn pull-down d v out = 29v, r l = 20k 2000 10000 v/ v common-mode rejection 0v v cm 35v, v in = 36v 80 94 db power supply rejection 4.5v v s 36v 80 96 db output sink current v in = 4.5v 10 18 ma npn saturation voltage i out = 1ma 0.4 0.6 v output source current 60 200 m a input voltage range 0v in C 1 v response time 5 m s leakage current (npn) 2 m a parameter conditions min typ max units reference reference voltage 4.5v v in 36v l 2.40 2.50 2.55 v line regulation 4.5v v in 36v l 0.01 0.02 %/v load regulation C 0.5ma i ref 1ma, v in = 12v l 0.3 0.4 % output source current v in = 5v l 1ma output sink current v in = 5v l 0.5 ma regulator supply current v in = 6v, i out 100 m a l 65 95 m a v in = 36v, i out 100 m a l 85 120 m a v in = 12v, i out = 125ma l 11 20 ma output current (v in C v out ) 3 1v, v in 3 6v l 125 ma load regulation (v in C v out ) 3 1v, v in 3 6v l 1% line regulation 6v v in 36v l 0.02 %/ v dropout voltage i out = 100 m a l 0.06 v i out = 125ma l 0.85 v feedback sense voltage v in = 12v l 2.38 2.5 2.57 v dropout detector current d v out = C 0.05v, i out = 500 m a l 3 m a feedback bias current l 50 na minimum load current v in = 36v l 50 m a short-circuit current v in = 36v l 300 400 ma pins 9 and 10 shorted, v in = 4.5v l 2.5 30 ma comparator offset voltage 0v v cm 35v, v in = 36v l 10 mv bias current 0v v cm 35v, v in = 36v (note 1) l 15 60 na offset current 0v v cm 35v, v in = 36v l 20 na gain-npn pull-down d v out = 29v, r l = 20k l 1000 v/ v
4 lt1020 e lectr ic al c c hara terist ics cc hara terist ics uw a t y p i ca lper f o r c e output current (ma) output voltage change (%) 0.3 0.2 0.1 0 0.1 0.2 0.3 0.1 10 100 1000 1020 g01 1 t j = 55? t j = 25? t j = 125? preload = 100 m a regulator short-circuit current temperature (?) ?0 short-circuit current (ma) 350 300 250 200 150 100 50 0 1020 g03 30 150 ?0 70 110 current limit tied to ground regulator load regulation dropout voltage dropout voltage regulator output current (ma) 0.1 0.01 input/output differential (v) 0.1 1 1 10 100 1020 g06 i dropout detector = 0.1% i out i dropout detector = 1% i out dropout voltage note 1: for 0v v cm 0.1v and t > 85 c i bias(max) is 100na. note 2: for t a C40 c output i sink(min) is 2.5ma. parameter conditions min typ max units comparator common-mode rejection 0v v cm 35v, v in = 36v l 80 db power supply rejection 4.5v v in 36v l 80 db output sink current v in = 4.5v (note 2) l 510 ma output source current l 40 120 m a input voltage range l 0v in C 1 v leakage current (npn) v in = 36v l 8 m a the l denotes specifications which apply over the full operating temperature range. regulator output current (ma) supply current (ma) 100 10 1 0.1 0.01 0.1 10 100 1000 1020 g02 1 t j = 55? to 125? supply current regulator output current (ma) 0.1 0.01 regulator input/output differential (v) 0.1 1 10 1000 1020 g04 1 100 d v out = 100mv regulator output current (ma) 0.1 0.01 regulator input/output differential (v) 0.1 1 10 1000 1020 g05 1 100 dropout detector = 5 m a
5 lt1020 cc hara terist ics uw a t y p i ca lper f o r c e ripple frequency (hz) 10 ripple rejection (db) 70 65 60 55 50 45 40 35 30 100 1k 1020 g10 10k 100k i out = 100ma i out = 10ma i out = 1ma v in = 100vdc, 1v p-p v out = 5v c out = 10 m f regulator ripple rejection regulator input/output differential (v) 1 supply current (ma) 10 1 0.1 0.01 5 1020 g11 i out = 100ma 10 15 20 25 i out = 1ma i out = 10ma v out = 5v t j = 55? to 125? supply current regulator output current (ma) 0.1 feedback pin current (na) 40 35 30 25 20 15 10 5 0 110 1020 g15 100 1000 t j = 125? t j = 25? t j = 55? supply current at dropout feedback pin current comparator input bias current common-mode voltage (v) referred to pin 9 (gnd) 1.0 input bias current (na) 100 90 80 70 60 50 40 30 20 10 0 0.6 1020 g14 0.6 0.2 0.2 1.0 t j = 125? gnd t j = 25? t j = 55? reference regulation regulator input/output differential (v) 0 dropout detector current ( m a) 1000 100 10 1 0.1 1020 g08 i out = 100ma 0.2 0.3 0.4 0.6 0.5 i out = 25ma i out = 1ma i out = 5ma regulator output current (ma) 0.1 dropout detector current ( m a) 1 10 100 10 1000 1020 g07 0.01 100 v diff = 500mv v diff = 1v dropout detector current dropout detector current temperature (?) 90 1 10 100 110 130 1020 g09 minimum load current ( m a) 70 150 80 100 120 140 regulator minimum load current regulator input/output differential (v) 0 supply current (ma) 10 1 0.1 0.01 0.1 1020 g12 i out = 100ma 0.2 0.3 0.4 0.6 0.5 i out = 10ma i out = 1ma t j = 55? to 125? reference output current (ma) 1.5 reference voltage change (mv) 1.0 0 1.0 1.5 1020 g13 4 3 2 1 0 ? ? ? ? 0.5 0.5
6 lt1020 cc hara terist ics uw a t y p i ca lper f o r c e pi fu ctio s u uu pins 1, 14: no internal connection. pin 2: regulator output. main output, requires 10 m f output capacitor. can be shorted to v in or ground without damaging the device. pin 3: input supply. bypass with 10 m f capacitor. must always be more positive than ground. pin 4: reference. 2.5v can source or sink current. may be shorted to ground or up to 5v. voltages in excess of 5v can damage the device. pin 5: comparator pnp output. pull-up current source for the comparator. may be connected to any voltage from v in to 36v more negative than v in (operates below ground). short-circuit protected. for example, if v in is 6v then pin 5 will operate to C 30v. pin 6: comparator npn output. may be connected to any voltage from ground to 36v more positive than ground (operates above v in ). short-circuit protected. pins 7, 8: comparator inputs. operates from ground to v in C 1v. comparator inputs will withstand 36v even with v in of 0v. pin 9: ground. pin 10: current limit. connecting this pin to ground decreases the regulator current limit to 3ma minimum. leave open when not used. pin 11: feedback. this is the feedback point of the regu- lator. when operating, it is nominally at 2.5v. optimum source resistance is 200k to 500k. the feedback pin should not be driven below ground or more positive than 5v. pin 12: shutdown. turns output off. pin 13: dropout detector. this pin acts like a current source from v in which turns on when the output transistor goes into saturation. the magnitude of the current de- pends on the magnitude of the output current and the input/output voltage differential. pin current ranges from 5 m a to about 300 m a. input voltage (v) 1 output voltage (v) 0 1020 g17 3 5 7 5.5 5.0 4.5 4.0 3.5 3.0 2.5 2.0 0 24 6 8 r l = 500 w r l = 50 w no load v out = 5v regulator thermal regulation time (ms) 0 output current (ma) 0.1 140 1020 g16 20 40 80 180 v in = 15v v out = 5v 60 0 0.1 0 50 output voltage change (%) 100 120 160 lt1020 turn-on characteristic
7 lt1020 u s a o pp l ic at i wu u i for atio the lt1020 is especially suited for micropower system applications. for example, the comparator section of the lt1020 may be used as a battery checker to provide an indication of low battery. the dropout detector can shut down the system when the battery voltage becomes too low to regulate. another type of system application for the lt1020 would be to generate the equivalent of split supplies from a single power input. the regulator section provides regulated output voltage and the reference, which can both source and sink current, is then an artificial system ground providing a split supply for the system. for many applications the comparator can be frequency compensated to operate as an amplifier. compensation values for various gains are given in the data sheet. the comparator gain is purposely low to make it easier to frequency compensate as an amplifier. two outputs are available on the comparator, the npn output is capable of sinking 10ma and can drive loads connected to voltages in excess of the positive power supply. this is useful for driving switches or linear regulators from a higher input voltage. the pnp output, which is capable of sourcing 100 m a can drive loads below ground. it can be used to make negative regulators with the addition of an external pass transistor. both outputs can be tied together to provide an output that swings from rail-to-rail for com- parator or amplifier applications. although it is not speci- fied, the gain for the pnp output is about 500 to 1000. if the pnp output is being used, to maximize the gain a 1 m a to 5 m a load should be placed upon the npn output collector. this is easily done by connecting a resistor between the npn collector and the reference output. (providing this operating current to the npn side in- creases the internal emitter base voltages and maximizes the gain of the pnp stage.) without this loading on the npn collector, at temperatures in excess of 75 c, the gain of the pnp collector can decrease by a factor of 2 or 3. reference internal to the lt1020 is a 2.5v trimmed class b output reference. the reference was designed to be able to source or sink current so it could be used in supply splitting applications as well as a general purpose reference for external circuitry. the design of the reference allows it to source typically 4ma or 5ma and sink 2ma. the available source and sink current decreases as temperature in- creases. it is sometimes desirable to decrease the ac output impedance by placing an output capacitor on them. the reference in the lt1020 becomes unstable with large capacitive loads placed directly on it. when using an output capacitor, about 20 w should be used to isolate the capacitor from the reference pin. this 20 w resistor can be placed directly in series with the capacitor or alternatively the reference line can have 20 w placed in series with it and then a capacitor to ground. this is shown in figure 1. other than placing large capacitive loads on the reference, no w i dagra b l o c k + 5 6 7 8 3 13 11 2 9 ref 2.5v ref out current limit v in v out dropout detector fb gnd inverting non- inverting npn out pnp out 10 4 1020 bd
8 lt1020 u s a o pp l ic at i wu u i for atio like most other ic regulators, a minimum load is required on the output of the lt1020 to maintain regulation. for most standard regulators this is normally specified at 5ma. of course, for a micropower regulator this would be a tremendously large current. the output current must be large enough to absorb all the leakage current of the pass transistor at the maximum operating temperature. it also affects the transient response; low output currents have long recovery times from load transients. at high operat- ing temperatures the minimum load current increases and having too low of a load current may cause the output to go unregulated. devices are tested for minimum load current at high temperature. the output voltage setting resistors to the feedback terminal can usually be used to provide the minimum load current. frequency compensation the lt1020 is frequency compensated by a dominant pole on the output. an output capacitor of 10 m f is usually large enough to provide good stability. increasing the output capacitor above 10 m f further improves stability. in order to insure stability, a feedback capacitor is needed between the output pin and the feedback pin. this is because stray capacitance can form another pole with the large value of feedback resistors used with the lt1020. also, a feedback capacitor minimizes noise pickup and improves ripple rejection. with the large dynamic operating range of the output current, 10000:1, frequency response changes widely. low ac impedance capacitors are needed to insure stabil- ity. while solid tantalum are best, aluminum electrolytics can be used but larger capacitor values may be needed. the current limit pin allows one of the internal nodes to be rolled off with a 0.05 m f capacitor to ground. with this capacitor, lower values of regulator output capacitance can be used (down to 1 m f) for low (<20ma) output currents. values of capacitance greater than 0.05 m f de- grade the transient response, so are not recommended. if the current limit pin is connected to gnd, the current limit is decreased and only a 1 m f output capacitor is needed. when bypassing the reference, a 20 w resistor must be connected in series with the capacitor. other precautions are necessary and the reference is stable with nominal stray capacitances. figure 2. minimizing oscillation in thermal shutdown overload protection the main regulator in the lt1020 is current limited at approximately 350ma. the current limit is stable with both input voltage and temperature. a current limit pin, when strapped to ground, decreases the output current. this allows the output current to be set to a lower value than 250ma. the output current available with the current limit pin strapped to ground is not well controlled so if precise current limiting is desired it should be provided externally as is shown in some of the application circuits. if the device is overloaded for long periods of time, thermal shutdown turns the output off. in thermal shutdown, there may be some oscillations which can disturb external circuitry. a diode connected between the reference and feedback terminal provides hysteresis under thermal shut- down, so that the device turns on and off with about a 5 second period and there are no higher frequency oscilla- tions. this is shown in figure 2. this diode is recom- mended for most applications. thermal shutdown tem- perature is set at approximately 145 c. figure 1. bypassing reference + ref + ref output output 20 w 20 w 10 m f 10 m f or 1020 f01 4 4 + 10 m f 0.001 m f * 2 11 4 v out fb ref lt1020 1020 f02 * diode adds feedback
9 lt1020 u s a o pp l ic at i ty p i ca l regulator with output voltage monitor regulator with improved transient response driving logic with dropout detector dropout lt1020 500k to 2m 3m 1020 ta04 v in > 5.2v 10 m f 0.001 m f 1m 1m 5v 2 11 3 9 v in v out fb gnd lt1020 1020 ta08 0.001 m f 22k + 1020 ta03 5 6 100k 20k v out 0.001 m f + 4 7 8 9 100k 10 m f 2 11 fb 5v logic logic output logic output goes low when v out drops by 100mv v in 3 1m 500k + ref lt1020 gnd 2.5v 5v regulator + v in > 5.2v i q = 40 m a 10 m f 10 m f 0.001 m f 1m 1m 5v 2 11 3 9 v in v out fb gnd + lt1020 1020 ta07 compensating the comparator as an op amp 7 + 5 6 1m c2 r2 r1 c1 at a v = 100, slew rate = 0.05v/ m s 6v/ m s a v 1 10 100 r1 33 w 100 w 10k c1 0.1 m f 0.047 m f 0.002 m f c2 0.001 m f ? r2 ? 100k 10k 1020 ta05 8
10 lt1020 u s a o pp l ic at i ty p i ca l dual output regulator 1020 ta12 5 6 1m 51k v out 0.001 m f + 4 78 9 1m 10 m f 2 11 fb 5v v in 3 gnd + ref lt1020 + 10 m f 0.01 m f +in ?n 190k 50k 2n2907 12v out v in 3 12.3v + nc 10 m f 0.001 m f 1m 1m 5v 2 11 3 9 v in v out fb gnd lt1020 1020 ta11 13 drop- out 1m 2n3904* transistor used because of low leakage characteristics * maintaining lowest i q at dropout dual output 150ma regulator dual output positive regulator 1 amp low dropout regulator + 10 m f 0.001 m f 100k 2 11 3 9 v in v out fb gnd lt1020 1020 ta09 5v 51k v in > 5.2v ?v reg 10ma 500k comp pnp ? in 7 46 500k 1m 8 5 500k 10 m f 0.001 m f + +input ref out comp npn input 2n3904 + 10 m f 0.001 m f 100k 2 11 3 9 v in v out fb gnd lt1020 1020 ta10 5v 51k* v in > 5.2v 5v reg 150ma 500k comp pnp ? in 7 46 100k 200k 8 5 500k 10 m f 0.001 m f + +input ref out comp npn input 4.7k 0.0047 m f 51k* 2n3904 for temperatures greater than 70?, reduce 51k resistors to 15k. i q will increase. * 2n3904 + 220 m f ? 0.001 m f 100k 2 11 3 9 v in v out fb gnd lt1020 1020 ta06 0.01 m f v out 5v 10k* 2.2k 10 150 w * * v in 100k c l for current limit ? 1.5a must have low esr. several 100 m f capacitors can be paralleled. * ? mje2955 see lt1129 data sheet for 700ma output
11 lt1020 u s a o pp l ic at i ty p i ca l + 10 m f 0.001 m f 1m 50k 2 11 9 v out fb gnd lt1020 1020 ta13 internal parasitic diodes of lt1020 gnd lt1020 1m 11 2 v out 5v 9 3 v in battery input v in 3 main power input fb v out v in v out battery backup regulator 5v regulator with shutdown 1020 ta15 5 6 1m r2 1m v out 0.001 m f + 4 7 8 9 1m 10 m f 2 11 fb v in 3 ref lt1020 0.047 m f 1m 13 drop- out v out * r1 1.5m + 1.5m v out turns off at dropout. v out turn on when: v in r2 r1 + r2 = 2.5v * turn-off at dropout + nc 10 m f 0.001 m f 1m 1m 5v 2 11 3 9 v in v out fb gnd lt1020 1020 ta14 transistor used because of low leakage characteristics. to turn off the output of the lt1020, force fb (pin 11) > 2.5v. * v in > 5.2v i q = 40 m a 100k 500k 2n3904* logic input
12 lt1020 u s a o pp l ic at i ty p i ca l + 1020 ta18 5 6 1m 0.001 m f + 4 7 8 9 1m 2 11 fb v in 3 lt1020 10 m f v out 5v 1m 13 ?ropout v in 0v ttl compatible logic output on dropout current limited 1 amp regulator 1020 ta17 5 6 100k 0.22 m f + 4 7 8 9 100k 220 m f ? 2 11 fb v in 12v 3 1n4148 lt1020 100 m f isc sense 0.03 w v out 5v 1a 1.2k must have low esr. several 100 m f capacitors can be paralleled. ? 100k + r l 2.2k 270 w mje2955 + 1 amp regulator with precision current limit + 220 m f ? 100k 2 11 3 9 v in v out fb gnd lt1020 1020 ta16 0.22 m f v out 5v, 1a 2.2k 270 w 100k sets current limit but increases dropout voltage by 0.5v. must have low esr. several 100 m f capacitors can be paralleled. * ? mje2955 0.5 w * v in 2n3906*
13 lt1020 u s a o pp l ic at i ty p i ca l charge pump negative voltage generator charge pump voltage doubler + 1020 ta19 5 6 + 7 8 9 22k 51k v in 3 1n5819 or equivalent ? out 1m 2n3904 + 20 m f v out (nl) @ ?(v in ?1v) v out (5ma) @ ?(v in ?3v) i q @ 300 m a 0.0033 m f 10 m f 51k 1m + 1020 ta20 5 6 7 8 9 22k 51k v in 3 v out 1m 2n3904 + 10 m f v out (nl) @ 2v in ?1v v out (5ma) @ 2v in ?3v i q @ 300 m a 0.0033 m f 51k 1m + 20 m f 1n5819 or equivalent
14 lt1020 u s a o pp l ic at i ty p i ca l 50ma battery charger and regulator switching preregulator for wide input voltage range 1020 ta21 6 1m 51k v out 0.001 m f + 4 7 8 9 1m 10 m f 2 11 fb 5v v in * 3 + lt1020 2.5v 20k v in 220k + 10 m f + 10 m f 6v battery 2n2905 * v in must be greater than the battery voltage plus 1.3v 3.9 w 10 m f + + + 22 m f 0.01 m f post regulator 2 11 3 4 v in v out fb v out 5v 100ma lt1020 1020 ta22 maintains low i q (< 100 m a) for all input voltages switcher efficiency = 85% post regulator efficiency = 82% overall efficiency = 70% switching regulator output = 2.5 (1 + r a /r b ). for a clean output from the linear regulator set to v out + 1.2v v ref 220k + 100 m f lt1020 comparator v in 7.5v to 30v to v ref (pin4) 100 m f 1.8m 1m 3.3m 30k 1k 2n3906 100k 10k 2m r b 1m 2m 30k r a 1.5m 0.001 m f switching regulator output 4mh 30k 220k 8 7 2n3904 2n3904 2n2222 6
15 lt1020 s w a w ch e ti i cdagra 6 +input nput r3 50k 5 q1 pnp output npn output q5 q8 q2 q6 q9 q7 r1 25 w r36 60k r2 50k r37 110 . 8 k r5 3k q12 q17 q18 q11 q10 r4 42k r35 42k q14 q13 q15 q16 7 8 r6 3k 15k 28k r38 20k r14 15k r15 80k r18 15k 100pf r26 15k r27 15k 125k 125k c3 10pf r28 2k r29 5 w 100pf r31 10 w r30 2k r32 2k 10 9 q48 q49 q46 q45 q47 r16 6k r8 100k q37 q35 q34 q36 q32 q33 q61 q62 q63 q22 r7 6.8k c1 10pf q21 q60 q23 c2 25pf r10 75k r11 15k q31 q30 r17 100 w q41 q40 q43 q44 3 13 2 output dropout detector q56 q42 q28 q24 q27 q26 q19 q20 q25 r8 40k r19 40k q38 r22 30k q39 r23 30k r24 390k c5 100pf q51 c6 100pf q52 q54 q55 r33 47k 138.3k 11 feedback reference 4 current limit gnd v in 1020 ss q29 q58 q64 12 shutdown 60k 60k q65 information furnished by linear technology corporation is believed to be accurate and reliable. however, no responsibility is assumed for its use. linear technology corporation makes no represen- tation that the interconnection of its circuits as described herein will not infringe on existing patent rights.
16 lt1020 linear technology corporation 1630 mccarthy blvd., milpitas, ca 95035-7487 (408) 432-1900 l fax : (408) 434-0507 l telex : 499-3977 ? linear technology corporation 1993 package descriptio u dimensions in inches (millimeters) unless otherwise noted. j package 14-lead ceramic dip n package 14-lead plastic dip s package 16-lead plastic soic lt/gp 1193 5k rev b ? printed in usa 0.045 ?0.068 (1.143 ?1.727) 0.100 ?0.010 (2.540 ?0.254) 0.014 ?0.026 (0.360 ?0.660) 0.200 (5.080) max 0.015 ?0.060 (0.381 ?1.524) 0.125 (3.175) min 0.290 ?0.320 (7.366 ?8.128) 0.008 ?0.018 (0.203 ?0.457) 0??15 0.385 ?0.025 (9.779 ?0.635) 1 234 56 7 0.220 ?0.310 (5.588 ?7.874) 0.785 (19.939) max 0.005 (0.127) min 14 11 8 9 10 13 12 0.025 (0.635) rad typ note: lead dimensions apply to solder dip or tin plate leads. 0.015 (0.380) min 0.125 (3.175) min 0.130 ?0.005 (3.302 ?0.127) 0.045 ?0.065 (1.143 ?1.651) 0.065 (1.651) typ 0.018 ?0.003 (0.457 ?0.076) 0.100 ?0.010 (2.540 ?0.254) 0.075 ?0.015 (1.905 ?0.381) 0.260 ?0.010 (6.604 ?0.254) 0.770 (19.558) max 3 1 2 4 5 6 7 8 9 10 11 12 13 14 0.009 ?0.015 (0.229 ?0.381) 0.300 ?0.325 (7.620 ?8.255) 0.325 +0.025 0.015 +0.635 0.381 8.255 () 0.016 ?0.050 0.406 ?1.270 0.010 ?0.020 (0.254 ?0.508) 45 0??8?typ 0.008 ?0.010 (0.203 ?0.254) 1 2 3 4 5 6 7 8 0.150 ?0.157* (3.810 ?3.988) 16 15 14 13 0.386 ?0.394* (9.804 ?10.008) 0.228 ?0.244 (5.791 ?6.197) 12 11 10 9 0.053 ?0.069 (1.346 ?1.752) 0.014 ?0.019 (0.355 ?0.483) 0.004 ?0.010 (0.101 ?0.254) 0.050 (1.270) typ *these dimensions do not include mold flash or protrusions. mold flash or protrusions shall not exceed 0.006 inch (0.15mm).

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