View 522970A_6515707.PDF datasheet online --- IC-ON-LINE

Datasheet File OCR Text:

1 lt1083/lt1084/lt1085 n three-terminal adjustable n output current of 3a, 5a or 7.5a n operates down to 1v dropout n guaranteed dropout voltage at multiple current levels n line regulation: 0.015% n load regulation: 0.1% n 100% thermal limit functional test n fixed versions available the lt ? 1083 series of positive adjustable regulators are designed to provide 7.5a, 5a and 3a with higher efficiency than currently available devices. all internal circuitry is designed to operate down to 1v input-to-output differen- tial and the dropout voltage is fully specified as a function of load current. dropout is guaranteed at a maximum of 1.5v at maximum output current, decreasing at lower load currents. on-chip trimming adjusts the reference voltage to 1%. current limit is also trimmed, minimizing the stress on both the regulator and power source circuitry under overload conditions. the lt1083/lt1084/lt1085 devices are pin compatible with older three-terminal regulators. a 10 m f output ca- pacitor is required on these new devices. however, this is included in most regulator designs. unlike pnp regulators, where up to 10% of the output current is wasted as quiescent current, the lt1083 quies- cent current flows into the load, increasing efficiency. 7.5a, 5a, 3a low dropout positive adjustable regulators 121 w 1% in out adj 365 w 1% 10 f 5v at 7.5a lt1083 v in 3 6.5v 1083/4/5 adj ta01 + 10 f* tantalum + *required for stability 5v, 7.5a regulator device output current* lt1083 7.5a lt1084 5.0a lt1085 3.0a *for a 1.5a low dropout regulator see the lt1086 data sheet. n high efficiency linear regulators n post regulators for switching supplies n constant current regulators n battery chargers output current 0 input/output voltage differential (v) 2 1 0 1083/4/5 adj ta02 i full load dropout voltage vs output current applicatio s u features typical applicatio u descriptio u , ltc and lt are registered trademarks of linear technology corporation.
2 lt1083/lt1084/lt1085 parameter conditions min typ max units reference voltage i out = 10ma, t j = 25 c, (v in C v out ) = 3v 1.238 1.250 1.262 v 10ma i out i full load 1.5v (v in C v out ) 25v (notes 4, 6, 7) l 1.225 1.250 1.270 v line regulation i load = 10ma, 1.5v (v in C v out ) 15v, t j = 25 c (notes 2, 3) 0.015 0.2 % l 0.035 0.2 % m grade: 15v (v in C v out ) 35v (notes 2, 3) l 0.05 0.5 % c, i grades: 15v (v in C v out ) 30v (notes 2, 3) l 0.05 0.5 % absolute m axi m u m ratings w ww u electrical characteristics power dissipation ............................... internally limited input-to-output voltage differential c grades .......................................................... 30v i grades ............................................................ 30v m grades .......................................................... 35v operating junction temperature range c grades: control section .................. 0 c to 125 c power transistor ............... 0 c to 150 c i grades: control section ............. C 40 c to 125 c power transistor .......... C 40 c to 150 c m grades: control section ............. C 55 c to 150 c power transistor .......... C 55 c to 200 c storage temperature range ................. C 65 c to 150 c lead temperature (soldering, 10 sec).................. 300 c 100% thermal shutdown functional test. package/order i n for m atio n w u u order part number order part number lt1083cp lt1084cp lt1084ct lt1084it lt1085ct lt1085it t package 3-lead plastic to-220 front view tab is output 3 2 1 v in v out adj v in v out adj p package 3-lead plastic to-3p front view tab is output 3 2 1 1 2 v in case is output bottom view adj k package 2-lead to-3 metal can q ja = 35 c/w q ja = 35 c/w q ja = 50 c/w v in v out adj 3 2 1 m package 3-lead plastic dd front view tab is output 3 2 1 *with package soldered to 0.5in 2 copper area over backside ground plane or internal power plane. q ja can vary from 20 c/w to > 40 c/w depending on mounting technique. q ja = 30 c/w* lt1083ck lt1083mk lt1084ck lt1084mk lt1085ck lt1085mk lt1085cm preco ditio i g u u u the l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at t a = 25 c. (note 1)
3 lt1083/lt1084/lt1085 parameter conditions min typ max units load regulation (v in C v out ) = 3v 10ma i out i full load t j = 25 c (notes 2, 3, 4, 6) 0.1 0.3 % l 0.2 0.4 % dropout voltage d v ref = 1%, i out = i fullload (notes 5, 6, 8) l 1.3 1.5 v current limit lt1083 (v in C v out ) = 5v l 8.0 9.5 a (v in C v out ) = 25v l 0.4 1.0 a lt1084 (v in C v out ) = 5v l 5.5 6.5 a (v in C v out ) = 25v l 0.3 0.6 a lt1085 (v in C v out ) = 5v l 3.2 4.0 a (v in C v out ) = 25v l 0.2 0.5 a minimum load current (v in C v out ) = 25v l 510 ma thermal regulation t a = 25 c, 30ms pulse lt1083 0.002 0.010 %/w lt1084 0.003 0.015 %/w lt1085 0.004 0.020 %/w ripple rejection f = 120hz, c adj = 25 m f, c out = 25 m f tantalum i out = i full load , (v in C v out ) = 3v (notes 6, 7, 8) l 60 75 db adjust pin current t j = 25 c55 m a l 120 m a adjust pin current change 10ma i out i full load 1.5v (v in C v out ) 25v (note 6) l 0.2 5 m a temperature stability l 0.5 % long term stability t a = 125 c, 1000 hrs 0.3 1 % rms output noise (% of v out )t a = 25 c 10hz = f 10khz 0.003 % thermal resistance junction-to-case control circuitry/power transistor lt1083 k package 0.6/1.6 c/w p package 0.5/1.6 c/w lt1084 k package 0.75/2.3 c/w p package 0.65/2.3 c/w t package 0.65/2.7 c/w lt1085 k package 0.9/3.0 c/w m, t packages 0.7/3.0 c/w electrical characteristics note 1: absolute maximum ratings are those values beyond which the life of a device may be impaired. note 2: see thermal regulation specifications for changes in output voltage due to heating effects. load and line regulation are measured at a constant junction temperature by low duty cycle pulse testing. note 3: line and load regulation are guaranteed up to the maximum power dissapation (60w for the lt1083, 45w for the lt1084 (k, p), 30w for the lt1084 (t) and 30w for the lt1085). power dissipation is determined by the input/output differential and the output current. guaranteed maximum power dissipation will not be available over the full input/output voltage range. note 4: i full load is defined in the current limit curves. the i fullload curve is defined as the minimum value of current limit as a function of input-to-output voltage. note that the 60w power dissipation for the lt1083 (45w for the lt1084 (k, p), 30w for the lt1084 (t), 30w for the lt1085) is only achievable over a limited range of input-to-output voltage. note 5: dropout voltage is specified over the full output current range of the device. test points and limits are shown on the dropout voltage curve. note 6: for lt1083 i full load is 5a for C 55 c t j < C 40 c and 7.5a for t j 3 C40 c. note 7: 1.7v (v in C v out ) 25v for lt1084 at C 55 c t j C40 c. note 8: dropout is 1.7v maximum for lt1084 at C 55 c t j C40 c. the l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at t a = 25 c.
4 lt1083/lt1084/lt1085 typical perfor m a n ce characteristics u w output current (a) 0 minimum input/output differential (v) 1 2 lt1083/4/5 adj g01 0 12345678910 indicates guaranteed test point 40? t j 150? 0? t j 125? t j = 150? t j = 25? t j = 55? input/output differential (v) 0 short-circuit current (a) 8 10 12 15 25 lt1083/4/5 adj g02 6 4 510 20 30 35 2 0 25 c 150 c i full load guaranteed ?5 c temperature (?) ?0 0.20 output voltage deviation (%) 0.15 0.10 0.05 0 050 100 150 lt1083/4/5 adj g03 0.05 0.10 ?5 25 75 125 d i = 7.5a output current (a) 0 0 minimun input/output differential (v) 1 1 2 34 lt1083/4/5 adj g04 5 2 6 indicates guaranteed test point 55? t j 150? 0? t j 125? t j = 150? t j = 55? t j = 25? input/output differential (v) 0 0 short-circuit current (a) 1 3 4 5 10 7 10 20 25 lt1083/4/5 adj g05 2 8 9 6 5 15 30 35 25 c ?5 c 150 c guaranteed i full load temperature (?) ?0 0.20 0.15 0.10 0.05 0.05 0.10 output voltage deviation (%) 0 050 100 150 lt1083/4/5 adj g06 ?5 25 75 125 d i = 5a temperature (?) ?0 0.20 0.15 0.10 0.05 0.05 0.10 output voltage deviation (%) 0 050 100 150 lt1083/4/5 adj g09 ?5 25 75 125 d i = 3a input/output differential (v) 0 short-circuit current (a) 4 5 6 15 25 lt1083/4/5 adj g08 3 2 510 20 30 35 1 0 25 c ?5 c i full load guaranteed 150 c output current (a) 0 0 minimum input/output differential (v) 1 2 1 2 lt1083/4/5 adj g07 3 4 indicates guaranteed test point t j = 150? t j = 25? 55? t j 150? t j = 55? 0? t j 125? lt1085 lt1085 lt1085 dropout voltage short-circut current load regulation lt1084 lt1084 lt1084 dropout voltage short-circut current load regulation lt1083 lt1083 lt1083 dropout voltage short-circut current load regulation
5 lt1083/lt1084/lt1085 typical perfor m a n ce characteristics u w minimum operating current temperature stability adjust pin current input/output differential (v) 0 0 minimum operating current (ma) 1 3 4 5 10 7 10 20 25 lt1083/4/5 adj g10 2 8 9 6 5 15 30 35 t j = 55? t j = 150? t j = 25? temperature (?) ?0 1.27 1.26 1.25 1.24 1.23 reference voltage (v) 050 100 150 lt1083/4/5 adj g11 ?5 25 75 125 temperature (?) ?0 100 90 80 70 60 50 40 30 20 10 0 adjust pin current ( m a) 050 100 150 lt1083/4/5 adj g12 ?5 25 75 125 frequency (hz) ripple rejection (db) 100 90 80 70 60 50 40 30 20 10 0 10 1k 10k 100k 1083/4/5 adj g13 100 v ripple 0.5v p-p v ripple 3v p-p (v in ?v out ) 3 3v (v in ?v out ) 3 v dropout c adj = 200 m f at frequencies < 60hz c adj = 25 m f at frequencies > 60hz i out = 7a output current (a) 0 ripple rejection (db) 100 90 80 70 60 50 40 30 20 10 0 2 4 5 1083/4/5 adj g14 13 6 7 8 v out = 5v c adj = 25 m f c out = 25 m f f r = 120hz v ripple 3v p-p f r = 20khz v ripple 0.5v p-p case temperature (?) 50 power (w) 100 90 80 70 60 50 40 30 20 10 0 lt1083/4/5 adj g15 60 70 80 90 100 110 120 130 140 150 lt1083mk lt1083cp lt1083ck * as limited by maximum junction temperature lt1083 lt1083 lt1083 ripple rejection ripple rejection vs current maximum power dissipation* lt1084 lt1084 lt1084 ripple rejection ripple rejection vs current maximum power dissipation* frequency (hz) ripple rejection (db) 100 90 80 70 60 50 40 30 20 10 0 10 1k 10k 100k 1083/4/5 adj g16 100 v ripple 0.5v p-p v ripple 3v p-p (v in ?v out ) 3 3v (v in ?v out ) 3 v dropout c adj = 200 m f at frequencies < 60hz c adj = 25 m f at frequencies > 60hz i out = 5a output current (a) 0 ripple rejection (db) 100 90 80 70 60 50 40 30 20 10 0 2 4 5 1083/4/5 adj g17 13 v out = 5v c adj = 25 m f c out = 25 m f f r = 120hz v ripple 3v p-p f r = 20khz v ripple 0.5v p-p case temperature (?) 50 power (w) 60 50 40 30 20 10 0 lt1083/4/5 adj g18 60 70 80 90 100 110 120 130 140 150 lt1084mk lt1084ct lt1084cp * as limited by maximum junction temperature lt1084ck
6 lt1083/lt1084/lt1085 typical perfor m a n ce characteristics u w time ( m s) 0 output voltage deviation (v) load current (a) 0.3 0.2 0.1 0 0.1 0.2 0.3 3 2 1 0 50 1083/4/5 adj g24 100 c adj = 0 c adj = 1 m f c in = 1 m f c out = 10 m f tantalum v out = 10v v in = 13v preload=100ma lt1085 lt1085 lt1085 ripple rejection ripple rejection vs current maximum power dissipation* frequency (hz) ripple rejection (db) 100 90 80 70 60 50 40 30 20 10 0 10 1k 10k 100k 1083/4/5 adj g19 100 v ripple 0.5v p-p v ripple 3v p-p (v in ?v out ) 3 3v (v in ?v out ) 3 v dropout c adj = 200 m f at frequencies < 60hz c adj = 25 m f at frequencies > 60hz i out = 3a output current (a) 0 ripple rejection (db) 100 90 80 70 60 50 40 30 20 10 0 1.0 1.5 2.5 3.0 1083/4/5 adj g20 0.5 2.0 v out = 5v c adj = 25 m f c out = 25 m f f r = 120hz v ripple 3v p-p f r = 20khz v ripple 0.5v p-p case temperature (?) 50 power (w) 50 40 30 20 10 0 lt1083/4/5 adj g21 60 70 80 90 100 110 120 130 140 150 lt1085mk lt1085ct lt1085ck * as limited by maximum junction temperature lt1083 lt1084 lt1085 load transient response load transient response load transient response time ( m s) 0 output voltage deviation (v) load current (a) 0.6 0.4 0.2 0 0.2 0.4 8 6 4 2 0 50 1083/4/5 adj g22 100 c adj = 0 c adj = 1 m f c in = 1 m f c out = 10 m f tantalum v out =10v v in = 13v preload=100ma time ( m s) 0 output voltage deviation (v) load current (a) 0.6 0.4 0.2 0 0.2 0.4 0.6 6 4 2 0 50 1083/4/5 adj g23 100 c adj = 0 c adj = 1 m f c in = 1 m f c out = 10 m f tantalum v out = 10v v in = 13v preload=100ma lt1083 lt1084 lt1085 line transient response line transient response line transient response time ( m s) 0 output voltage deviation (v) input deviation (v) 60 40 20 0 ?0 ?0 ?0 14 13 12 100 1083/4/5 adj g26 200 c adj = 0 c adj = 1 m f v out = 10v i in = 0.2a c in = 1 m f tantalum c out = 10 m f tantalum time ( m s) 0 output voltage deviation (mv) input deviation (v) 60 40 20 0 ?0 ?0 ?0 14 13 12 100 1083/4/5 adj g27 200 c adj = 0 c adj = 1 m f v out = 10v i in = 0.2a c in = 1 m f tantalum c out = 10 m f tantalum time ( m s) 0 output voltage deviation (mv) input deviation (v) 150 100 50 0 ?0 100 150 14 13 12 100 1083/4/5 adj g25 200 c adj = 0 c adj = 1 m f v out = 10v i in = 0.2a c in = 1 m f tantalum c out = 10 m f tantalum
7 lt1083/lt1084/lt1085 block diagra m w applicatio n s i n for m atio n wu u u the lt1083 family of three-terminal adjustable regulators is easy to use and has all the protection features that are expected in high performance voltage regulators. they are short-circuit protected, and have safe area protection as well as thermal shutdown to turn off the regulator should the junction temperature exceed about 165 c. these regulators are pin compatible with older three- terminal adjustable devices, offer lower dropout voltage and more precise reference tolerance. further, the refer- ence stability with temperature is improved over older types of regulators. the only circuit difference between using the lt1083 family and older regulators is that this new family requires an output capacitor for stability. stability the circuit design used in the lt1083 family requires the use of an output capacitor as part of the device frequency compensation. for all operating conditions, the addition of 150 m f aluminium electrolytic or a 22 m f solid tantalum on the output will ensure stability. normally, capacitors much smaller than this can be used with the lt1083. many different types of capacitors with widely varying charac- teristics are available. these capacitors differ in capacitor tolerance (sometimes ranging up to 100%), equivalent series resistance, and capacitance temperature coeffi- cient. the 150 m f or 22 m f values given will ensure stability. when the adjustment terminal is bypassed to improve the ripple rejection, the requirement for an output capacitor increases. the value of 22 m f tantalum or 150 m f aluminum covers all cases of bypassing the adjustment terminal. without bypassing the adjustment terminal, smaller ca- pacitors can be used with equally good results and the table below shows approximately what size capacitors are needed to ensure stability. recommended capacitor values input output adjustment 10 m f10 m f tantalum, 50 m f aluminum none 10 m f22 m f tantalum, 150 m f aluminum 20 m f + thermal limit v adj v out 1083/4/5 adj bd v in
8 lt1083/lt1084/lt1085 applicatio n s i n for m atio n wu u u input pin instantaneously shorted to ground, can damage occur. a crowbar circuit at the input of the lt1083 can generate those kinds of currents, and a diode from output to input is then recommended. normal power supply cycling or even plugging and unplugging in the system will not generate current large enough to do any damage. the adjustment pin can be driven on a transient basis 25v, with respect to the output without any device degradation. of course, as with any ic regulator, exceed- ing the maximum input to output voltage differential causes the internal transistors to break down and none of the protection circuitry is functional. normally, capacitor values on the order of 100 m f are used in the output of many regulators to ensure good transient response with heavy load current changes. output capaci- tance can be increased without limit and larger values of output capacitor further improve stability and transient response of the lt1083 regulators. another possible stability problem that can occur in mono- lithic ic regulators is current limit oscillations. these can occur because, in current limit, the safe area protection exhibits a negative impedance. the safe area protection decreases the current limit as the input-to-output voltage increases. that is the equivalent of having a negative resistance since increasing voltage causes current to decrease. negative resistance during current limit is not unique to the lt1083 series and has been present on all power ic regulators. the value of the negative resistance is a function of how fast the current limit is folded back as input-to-output voltage increases. this negative resis- tance can react with capacitors or inductors on the input to cause oscillation during current limiting. depending on the value of series resistance, the overall circuitry may end up unstable. since this is a system problem, it is not necessarily easy to solve; however, it does not cause any problems with the ic regulator and can usually be ignored. protection diodes in normal operation, the lt1083 family does not need any protection diodes. older adjustable regulators required protection diodes between the adjustment pin and the output and from the output to the input to prevent over- stressing the die. the internal current paths on the lt1083 adjustment pin are limited by internal resistors. therefore, even with capacitors on the adjustment pin, no protection diode is needed to ensure device safety under short-circuit conditions. diodes between input and output are usually not needed. the internal diode between the input and the output pins of the lt1083 family can handle microsecond surge currents of 50a to 100a. even with large output capaci- tances, it is very difficult to get those values of surge currents in normal operations. only with a high value of output capacitors, such as 1000 m f to 5000 m f and with the r1 r2 in out adj v out lt1083 d1 1n4002 (optional) v in 1083/4/5 adj f00 c out 150 f + c adj 10 f + overload recovery like any of the ic power regulators, the lt1083 has safe area protection. the safe area protection decreases the current limit as input-to-output voltage increases and keeps the power transistor inside a safe operating region for all values of input-to-output voltage. the lt1083 protection is designed to provide some output current at all values of input-to-output voltage up to the device breakdown. when power is first turned on, as the input voltage rises, the output follows the input, allowing the regulator to start up into very heavy loads. during the start-up, as the input voltage is rising, the input-to-output voltage differential remains small, allowing the regulator to supply large output currents. with high input voltage, a problem can occur wherein removal of an output short will not allow the output voltage to recover. older regulators, such as the 7800 series, also exhibited this phenomenon, so it is not unique to the lt1083.
9 lt1083/lt1084/lt1085 applicatio n s i n for m atio n wu u u the problem occurs with a heavy output load when the input voltage is high and the output voltage is low, such as immediately after removal of a short. the load line for such a load may intersect the output current curve at two points. if this happens, there are two stable output operating points for the regulator. with this double intersection, the power supply may need to be cycled down to zero and brought up again to make the output recover. ripple rejection the typical curves for ripple rejection reflect values for a bypassed adjustment pin. this curve will be true for all values of output voltage. for proper bypassing and ripple rejection approaching the values shown, the impedance of the adjust pin capacitor at the ripple frequency should be less than the value of r1, (normally 100 w to 120 w ). the size of the required adjust pin capacitor is a function of the input ripple frequency. at 120hz the adjust pin capacitor should be 25 m f if r1 = 100 w . at 10khz only 0.22 m f is needed. for circuits without an adjust pin bypass capacitor, the ripple rejection will be a function of output voltage. the output ripple will increase directly as a ratio of the output voltage to the reference voltage (v out /v ref ). for example, with the output voltage equal to 5v and no adjust pin capacitor, the output ripple will be higher by the ratio of 5v/ 1.25v or four times larger. ripple rejection will be de- graded by 12db from the value shown on the typical curve. output voltage the lt1083 develops a 1.25v reference voltage between the output and the adjust terminal (see figure 1). by placing a resistor r1 between these two terminals, a constant current is caused to flow through r1 and down through r2 to set the overall output voltage. normally this current is the specified minimum load current of 10ma. because i adj is very small and constant when compared with the current through r1, it represents a small error and can usually be ignored. figure 1. basic adjustable regulator r1 r2 in out i adj 50 m a adj v out lt1083 v in 1083/4/5 adj f01 v ref v out = v ref 1 + + i adj r2 r2 r1 ( ) load regulation because the lt1083 is a three-terminal device, it is not possible to provide true remote load sensing. load regu- lation will be limited by the resistance of the wire connect- ing the regulator to the load. the data sheet specification for load regulation is measured at the bottom of the package. negative side sensing is a true kelvin connec- tion, with the bottom of the output divider returned to the negative side of the load. although it may not be immedi- ately obvious, best load regulation is obtained when the top of the resistor divider r1 is connected directly to the case not to the load . this is illustrated in figure 2. if r1 were connected to the load, the effective resistance be- tween the regulator and the load would be: r rr r r parasitic line pp + ? ? ? ? = 21 1 , resistance figure 2. connections for best load regulation lt1083 out in v in adj r p parasitic line resistance r1* *connect r1 to case connect r2 to load 1083/4/5 adj f02 r l r2*
10 lt1083/lt1084/lt1085 applicatio n s i n for m atio n wu u u connected as shown, r p is not multiplied by the divider ratio. r p is about 0.004 w per foot using 16-gauge wire. this translates to 4mv/ft at 1a load current, so it is important to keep the positive lead between regulator and load as short as possible and use large wire or pc board traces. thermal considerations the lt1083 series of regulators have internal power and thermal limiting circuitry designed to protect the device under overload conditions. for continuous normal load conditions however, maximum junction temperature rat- ings must not be exceeded. it is important to give careful consideration to all sources of thermal resistance from junction to ambient. this includes junction-to-case, case- to-heat sink interface, and heat sink resistance itself. new thermal resistance specifications have been developed to more accurately reflect device temperature and ensure safe operating temperatures. the data section for these new regulators provides a separate thermal resistance and maximum junction temperature for both the control sec- tion and the power transistor . previous regulators, with a single junction-to-case thermal resistance specification, used an average of the two values provided here and therefore could allow excessive junction temperatures under certain conditions of ambient temperature and heat sink resistance. to avoid this possibility, calculations should be made for both sections to ensure that both thermal limits are met. junction-to-case thermal resistance is specified from the ic junction to the bottom of the case directly below the die. this is the lowest resistance path for heat flow. proper mounting is required to ensure the best possible thermal flow from this area of the package to the heat sink. thermal compound at the case-to-heat sink interface is strongly recommended. if the case of the device must be electri- cally isolated, a thermally conductive spacer can be used, as long as its added contribution to thermal resistance is considered. note that the case of all devices in this series is electrically connected to the output. for example, using an lt1083ck (to-3, commercial) and assuming: v in (max continuous) = 9v, v out = 5v, i out = 6a, t a = 75 c, q heat sink = 1 c/w, q case-to-heat sink = 0.2 c/w for k package with thermal compound. power dissipation under these conditions is equal to: p d = (v in C v out )(i out ) = 24w junction temperature will be equal to: t j = t a + p d ( q heat sink + q case-to-heat sink + q jc ) for the control section: t j = 75 c + 24w (1 c/w + 0.2 c/w + 0.6 c/w) = 118 c 118 c < 125 c = t jmax (control section commercial range) for the power transistor: t j = 75 c + 24w (1 c/w + 0.2 c/w + 1.6 c/w) = 142 c 142 c < 150 c = t jmax (power transistor commercial range) in both cases the junction temperature is below the maximum rating for the respective sections, ensuring reliable operation.
11 lt1083/lt1084/lt1085 typical applicatio n s u 7.5a variable regulator 15v 15v 15v 110vac t1 triad f-269u + + + + + out in lt1083 out in adj c30b c30b 3 20 w 20 w 1 2 l 1mh t2 1n4003 1n4148 1n4003 1n914 c1 50,000 f 100 f lt1004-1.2 1n4003 1 m f 0.1 f 1 f 100pf 560 w 16k* 16k* lt1004-1.2 11k* 11k* 0v to 35v oa to 7.5a 10k 82k 15k 2 2 2 3 3 3 8 8 ?5v ?5v ?5v 15v 4 4 4 7 7 1 1 200k 750 w * 2k output adjust 2.7k 15v 1.5k 15k 10k 2n3904 nc 8 6 7 1 lt1011 lt1011 lm301a * 1% film resistor l: dale to-5 type t2: stancor 11z-2003 general purpose regulator with scr preregulator to lower power dissipation. about 1.7v differential is maintained across the lt1083 independent of output voltage and load current lt1083/4/5 adj ta05
12 lt1083/lt1084/lt1085 typical applicatio n s u lt1083 out in v in adj lt1083 0.015 w out 2 feet #18 wire* in adj r1 120 w r2 *the #18 wire acts as ballast resistance insuring current sharing between both devices lt1083/4/5 adj ta03 v out = 1.25v 1 + i out = 0a to 15a r2 r1 () paralleling regulators remote sensing r1 121 w 1% in out adj r2 365 w 1% 10 f v out 5v lt1083 v in 1083/4/5 adj ta04 + c1 25 f* 150 f + + *c1 improves ripple rejection. x c should be < r1 at ripple frequency improving ripple rejection + lt1083 out in v in v in return adj r p (max drop 300mv) 121 w 365 w 25 w 10 m f 5 m f 100 m f 1083/4/5 adj ta07 r l v out 5v return 25 w 2 6 7 1 8 100pf 3 4 + + + 1k lm301a
13 lt1083/lt1084/lt1085 typical applicatio n s u high efficiency regulator with switching preregulator + + v in 28v 28v 470 w 240 w 2k 28v 4n28 1n914 1n914 lt1011 10k 10k 10k 1k 1m mr1122 1mh 10,000 f v out lt1083 out in adj 1083/4/5 adj ta06 1.2v to 15v adjustable regulator 5v regulator with shutdown* in v in out ttl adj 1k 1k 10 f 100 f v out 5v lt1083 2n3904 1083/4/5 adj ta09 + 121 w 1% 365 w 1% + *output shuts down to 1.3v in out adj r2 1k c1* 10 f v out ? v in lt1083 1083/4/5 adj ta08 + c2 100 f + r1 90.9 w *needed if device is far from filter capacitors ? v out = 1.25v 1 + r2 r1 ( )
14 lt1083/lt1084/lt1085 dimension in inches (millimeters) unless otherwise noted. package descriptio n u k2 (to-3) 1098 0.038 ?0.043 (0.965 ?1.09) 0.060 ?0.135 (1.524 ?3.429) 0.320 ?0.350 (8.13 ?8.89) 0.420 ?0.480 (10.67 ?12.19) 0.760 ?0.775 (19.30 ?19.69) 0.490 ?0.510 (12.45 ?12.95) r 0.167 ?0.177 (4.24 ?4.49) r 0.151 ?0.161 (3.86 ?4.09) dia, 2plcs 1.177 ?1.197 (29.90 ?30.40) 0.655 ?0.675 (16.64 ?17.15) 0.067 ?0.077 (1.70 ?1.96) 0.210 ?0.220 (5.33 ?5.59) 0.425 ?0.435 (10.80 ?11.05) m (dd3) 1098 0.050 (1.270) bsc 0.143 +0.012 0.020 () 3.632 +0.305 0.508 0.090 ?0.110 (2.286 ?2.794) 0.013 ?0.023 (0.330 ?0.584) 0.095 ?0.115 (2.413 ?2.921) 0.004 +0.008 0.004 () 0.102 +0.203 0.102 0.050 0.012 (1.270 0.305) 0.059 (1.499) typ 0.045 ?0.055 (1.143 ?1.397) 0.165 ?0.180 (4.191 ?4.572) 0.330 ?0.370 (8.382 ?9.398) 0.060 (1.524) typ 0.390 ?0.415 (9.906 ?10.541) 15 typ 0.300 (7.620) 0.075 (1.905) 0.183 (4.648) 0.060 (1.524) 0.060 (1.524) 0.256 (6.502) bottom view of dd pak hatched area is solder plated copper heat sink k package 2-lead to-3 metal can (ltc dwg # 05-08-1310) m package 3-lead plastic dd pak (ltc dwg # 05-08-1460)
15 lt1083/lt1084/lt1085 dimension in inches (millimeters) unless otherwise noted. package descriptio n u 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. 0.580 ?0.6oo (14.73 ?15.24) 0.170 (4.32) max 0.325 (8.255) 0.580 (14.732) 0.560 (14.224) 0.620 ?0.64o (15.75 ?16.26) 0.170 ?0.2oo (4.32 ?5.08) mounting hole 0.115 ?0.145 (2.92 ?3.68) dia 0.580 ?0.6oo (14.73 ?15.24) 0.830 ?0.870 (21.08 ?22.10) 0.780 ?0.800 (19.81 ?20.32) 0.620 ?0.64o (15.75 ?16.26) 0.215 (5.46) bsc 0.113 ?0.123 (2.87 ?3.12) 0.042 ?0.052 (1.07 ?1.32) 0.074 ?0.084 (1.88 ?2.13) 0.187 ?0.207 (4.75 ?5.26) 0.060 ?0.080 (1.52 ?2.03) 18 ?22 3 ?7 0.087 ?0.102 (2.21 ?2.59) 0.020 ?0.040 (0.51 ?1.02) ejector pin marks 0.105 ?0.125 (2.67 ?3.18) dia p3 0996 0.098 (2.489) 0.124 (3.149) 0.700 (17.780) 0.275 (6.985) bottom view of to-3p hatched area is solder plated copper heat sink 0.100 (2.540) bsc 0.028 ?0.038 (0.711 ?0.965) t3 (to-220) 1098 0.045 ?0.055 (1.143 ?1.397) 0.165 ?0.180 (4.191 ?4.572) 0.095 ?0.115 (2.413 ?2.921) 0.013 ?0.023 (0.330 ?0.584) 0.520 ?0.570 (13.208 ?14.478) 0.980 ?1.070 (24.892 ?27.178) 0.218 ?0.252 (5.537 ?6.401) 0.050 (1.270) typ 0.147 ?0.155 (3.734 ?3.937) dia 0.390 ?0.415 (9.906 ?10.541) 0.330 ?0.370 (8.382 ?9.398) 0.460 ?0.500 (11.684 ?12.700) 0.570 ?0.620 (14.478 ?15.748) 0.230 ?0.270 (5.842 ?6.858) t package 3-lead plastic to-220 (ltc dwg # 05-08-1420) p package 3-lead plastic to-3p (similar to to-247) (ltc dwg # 05-08-1450)
16 lt1083/lt1084/lt1085 108345fd lt/tp 0200 2k rev d ? printed in usa ? linear technology corporation 1994 linear technology corporation 1630 mccarthy blvd., milpitas, ca 95035-7417 (408) 432-1900 l fax: (408) 434-0507 l www.linear-tech.com typical applicatio n s u part number description comments lt1086 1.5a low dropout regulator fixed 2.85v, 3.3v, 3.6v, 5v and 12v output lt1117 800ma low dropout regulator fixed 2.85v, 3.3v, 5v or adjustable output lt1584/lt1585/lt1587 7a/4.6a/3a fast response low dropout regulators for high performance microprocessors lt1580 7a very low dropout linear regulator 0.54v dropout at 7a, fixed 2.5v out and adjustable lt1581 10a very low dropout linear regulator 0.43v dropout at 10a, fixed 2.5v out and adjustable lt1430 high power step-down switching regulator 5v to 3.3v at 10a, >90% efficiency lt1575 ultrafast tm transient response ldo controller external mosfet pass element lt1573 ultrafast transient response ldo controller external pnp pass element ultrafast is a trademark of linear technology corporation. related parts automatic light control protected high current lamp driver in v in out adj 10 f 100 f lt1083 1083/4/5 adj ta10 1.2k + out ttl or cmos in adj 15v 12v 5a lt1083 1083/4/5 adj ta11 10k

▲Up To Search▲

Price & Availability of 522970A

	To Download 522970A Datasheet File
If you can't view the Datasheet, Please click here to try to view without PDF Reader .