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1 lt1083/lt1084/lt1085 fixed device output current* lt1083 7.5 amps lt1084 5.0 amps lt1085 3.0 amps *for a 1.5a low dropout regulator see the lt1086 data sheet. n three-terminal 3.3v, 3.6v, 5v and 12v 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 adjustable versions available the lt ? 1083 series of positive adjustable regulators are designed to provide 3a, 5a and 7.5a with higher efficiency than currently available devices. all internal circuitry is designed to operate down to 1v input to output differential 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 output voltage to 1%. current limit is also trimmed, minimizing the stress on both the regulator and power source circuitry under overload conditions. the lt1083 series devices are pin compatible with older three-terminal regulators. a 10 m f output capacitor is required on these new devices; however, this is usually 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. 3a, 5a, 7.5a low dropout positive fixed regulators n high efficiency linear regulators n post regulators for switching supplies n constant current regulators n battery chargers 5v, 7.5a regulator dropout voltage vs output current features descriptio u applicatio s u typical applicatio u v in 3 6.5v 5v at 7.5a lt1083-5 lt1083/4/5 ta01 22 f* tantalum + 10 f + *required for stability output current (a) 0 input/output voltage differential (v) 2 1 0 1083/4/5 ta02 i fullload /2 i fullload , ltc and lt are registered trademarks of linear technology corporation.
2 lt1083/lt1084/lt1085 fixed tab is output t package 3-lead plastic to-220 v in v out gnd front view 3 2 1 power dissipation .............................. internally limited input voltage* ........................................................ 30v operating input voltage 3.3v, 3.6v devices ........................................... 20v 5v devices ....................................................... 20v 12v devices ..................................................... 25v operating junction temperature range c grades control section .............................. 0 c to 125 c power transistor ............................ 0 c to 150 c m grades control section .......................... C55 c to 150 c power transistor ........................ C55 c to 200 c storage temperature range ................ C 65 c to 150 c lead temperature (soldering, 10 sec)................. 300 c 100% thermal limit functional test. *although the devices maximum operating voltage is limited, (20v for a 3v, 5v device, and 25v for a 12v device) the devices are guaranteed to withstand transient input voltages up to 30v. for input voltages greater than the maximum operating input voltage some degradation of specifications will occur. for input/output voltage differentials greater than 15v, a minimum external load of 5ma is required to maintain regulation. order part number lt1083cp-5 lt1083cp-12 lt1084cp-5 lt1084cp-12 lt1083ck-5 lt1083ck-12 lt1083mk-5 lt1083mk-12 lt1084ck-5 lt1084ck-12 lt1084mk-5 lt1084mk-12 lt1085ck-5 lt1085ck-12 lt1085mk-5 lt1085mk-12 q ja = 35 c/w q ja = 45 c/w q ja = 50 c/w lt1084ct-3.3 lt1084ct-5 lt1084ct-12 lt1085ct-3.3 lt1085ct-3.6 lt1085ct-5 lt1085ct-12 lt1085cm-3.3 lt1085cm-3.6 lt1085im-3.6 q ja = 30 c/w* *with package soldered to 0.52in 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. absolute axi u rati gs w ww u (note 1) preco ditio i g u u u package/order i for atio uu w 1 2 v in case is output gnd k package 2-lead to-3 metal can v in v out gnd p package 3-lead to-3p plastic front view tab is output 3 2 1 order part number tab is output m package 3-lead plastic dd front view v in v out gnd 3 2 1 obsolete not recommended for new designs consult factory for parts specified with wider operating temperature ranges.
3 lt1083/lt1084/lt1085 fixed parameter conditions min typ max units output voltage lt1084-3.3 i out = 0ma, t j = 25 c, v in = 8v (k package only) 3.270 3.300 3.330 v 4.8v v in 15v, 0 i out i fulload (notes 3, 4, 9) l 3.235 3.300 3.365 v lt1085-3.3 v in = 5v, i out = 0ma, t j = 25 c (k package only) 3.270 3.300 3.330 v 4.8v v in 15v, 0 i out i fulload (notes 3, 4, 9) l 3.235 3.300 3.365 v lt1085-3.6 v in = 5v, i out = 0ma, t j = 25 c (k package only) 3.564 3.600 3.636 v 5v v in 15v, 0 i out i fulload (note 9) l 3.500 3.672 v 5v v in 15v, 0 i out i fulload , tj 3 0 c (notes 3, 4, 9) 3.528 3.672 v lt1085-3.6 5v v in 15v, 0 i out 2.5a (notes 3, 4, 9) l 3.528 3.672 v v in = 4.75v, i out = 3a, t j 3 0 c 3.350 3.672 v v in = 4.75v, i out = 2.5a, t j 3 0 c 3.450 3.672 v v in = 4.75v, i out = 1.5a, t j > 0 c 3.528 3.672 v lt1083/4/5-5 i out = 0ma, t j = 25 c, v in = 8v (k package only) 4.950 5.000 5.050 v 0 i out i fulload , 6.5v v in 20v (notes 4, 6, 7, 9) 4.900 5.000 5.100 v lt1083/4/5-12 i out = 0ma, t j = 25 c, v in = 15v (k package only) 11.880 12.000 12.120 v 0 i out i fulload , 13.5v v in 25v (notes 4, 6, 7, 9) 11.760 12.000 12.240 v line regulation lt1084-3.3 i out = 0ma, t j = 25 c, 4.8v v in 15v 0.5 6 mv l 1.0 6 mv lt1085-3.3 4.8v v in 15v, i out = 0ma, t j = 25 c 0.5 6 mv l 1.0 6 mv lt1085-3.6 4.8v v in 15v, i out = 0ma, t j = 25 c 0.5 6 mv l 1.0 6 mv lt1083/4/5-5 i out = 0ma, t j = 25 c, 6.5v v in 20v (notes 2, 3) 0.5 10 mv l 1.0 10 mv lt1083/4/5-12 i out = 0ma, t j = 25 c, 13.5v v in 25v (notes 2, 3) 1.0 25 mv l 2.0 25 mv load regulation lt1084-3.3 v in = 5v, 0 i out 5a, t j = 25 c315mv l 720 mv lt1085-3.3 v in = 5v, 0 i out 3a, t j = 25 c315mv l 720 mv lt1085-3.6 v in = 5.25v, 0 i out 3a, t j = 25 c315mv l 720 mv lt1083/4/5-5 v in = 8v, 0 i out i fullload, t j = 25 c (notes 2, 3, 4, 6) 5 20 mv l 10 35 mv lt1083/4/5-12 v in = 15v, 0 i out i fullload, t j = 25 c (notes 2, 3, 4, 6) 12 36 mv l 24 72 mv dropout voltage lt1084/5-3.3 d v out = 33mv, i out = i full load (notes 5, 6) l 1.3 1.5 v lt1085-3.6 d v out = 36mv, i out = i full load (notes 5, 6) l 1.3 1.5 v lt1083/4/5-5 d v out = 50mv, i out = i full load (notes 5, 6) l 1.3 1.5 v lt1083/4/5-12 d v out = 120mv, i out = i full load (notes 5, 6) l 1.3 1.5 v current limit lt1083-5 v in = 10v l 8.0 9.5 a lt1083-12 v in = 17v l 8.0 9.5 a lt1084-3.3 v in = 8v l 5.5 6.5 a lt1084-5 v in = 10v l 5.5 6.5 a lt1084-12 v in = 17v l 5.5 6.5 a lt1085-3.3/3.6 v in = 8v l 3.2 4.0 a lt1085-5 v in = 10v l 3.2 4.0 a lt1085-12 v in = 17v l 3.2 4.0 a electrical characteristics 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 fixed parameter conditions min typ max units quiescient current lt1084-3.3 v in = 18v l 5.0 10.0 ma lt1085-3.3 v in = 18v l 5.0 10.0 ma lt1085-3.6 v in = 18v l 5.0 10.0 ma lt1083/4/5-5 v in 20v l 5.0 10.0 ma lt1083/4/5-12 v in 25v l 5.0 10.0 ma thermal regulation lt1083-5/12 t a = 25 c, 30ms pulse 0.002 0.010 %/w lt1084-3.3/5/12 0.003 0.015 %/w lt1085-3.3/3.6/5/12 0.004 0.020 %/w ripple rejection f = 120hz, c out = 25 m f tantalum, i out = i fullload (note 4) lt1084-3.3 f = 120hz, c out = 25 m f tantalum, i out = 5a, v in = 6.3v l 60 72 db lt1085-3.3 f = 120hz, c out = 25 m f tantalum, v in = 6.3v, i out = 3a l 60 72 db lt1085-3.6 f = 120hz, c out = 25 m f tantalum, v in = 6.6v, i out = 3a l 60 72 db lt1083/4/5-5 v in = 8v (note 6) l 60 68 db lt1083/4/5-12 v in = 15v (note 6) l 54 60 db temperature stability l 0.5 % long term stability t a = 125 c, 1000 hrs. 0.03 1.0 % rms output noise t a = 25 c, (% of v out ) 10hz = f 10khz 0.003 % thermal resistance control circuitry/power transistor (see applications information) junctrion-to-case 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 t package 0.7/3.0 c/w dd package 0.7/3.0 c/w 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 C40 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 voltage 1.7v maximum for lt1084 at C55 c t j C40 c. note 9: full load current is not available at all input-output voltages. see notes 3, 4, 6. 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 dissipation (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 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 electrical characteristics the l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at t a = 25 c.
5 lt1083/lt1084/lt1085 fixed lt1084 dropout voltage lt1084 short circuit current lt1084 load regulation output current (a) 0 0 minimun input/output differential (v) 1 1 2 34 lt1083/4/5 fixedg04 5 2 6 indicates guaranteed test point ?5 c t j 150 c 0 c t j 125 c t j = 150 c t j = 55 c t j = 25 c input/output differential (v) 0 0 short-circuit current (a) 1 3 4 5 10 7 10 20 25 lt1083/4/5 fixed g05 2 8 9 6 5 15 30 35 25 c ?5 c 150 c guaranteed i full load temperature ( c) ?0 0.20 0.15 0.10 0.05 0.05 0.10 output voltage deviation (%) 0 050 100 150 lt1083/4/5 fixed g06 ?5 25 75 125 d i = 5a lt1085 dropout voltage output current (a) 0 0 minimum input/output differential (v) 1 2 1 2 lt1083/4/5 fixed g07 3 4 indicates guaranteed test point t j = 150 c t j = 25 c ?5 c t j 150 c t j = 55 c 0 c t j 125 c temperature ( c) ?0 0.20 0.15 0.10 0.05 0.05 0.10 output voltage deviation (%) 0 050 100 150 lt1083/4/5 fixed g09 ?5 25 75 125 d i = 3a lt1085 load regulation input/output differential (v) 0 short-circuit current (a) 4 5 6 15 25 lt1083/4/5 fixed g08 3 2 510 20 30 35 1 0 25 c ?5 c i full load guaranteed 150 c lt1085 short-circuit current output current (a) 0 minimum input/output differential (v) 1 2 lt1083/4/5 fixed g01 0 12345678910 indicates guaranteed test point ?0 c t j 150 c 0 c t j 125 c t j = 150 c t j = 25 c t j = 55 c input/output differential (v) 0 short-circuit current (a) 8 10 12 15 25 lt1083/4/5 fixed g02 6 4 510 20 30 35 2 0 25 c 150 c i full load guaranteed ?5 c temperature ( c) ?0 0.20 output voltage deviation (%) 0.15 0.10 0.05 0 050 100 150 lt1083/4/5 fixed g03 0.05 0.10 ?5 25 75 125 d i = 7.5a lt1083 dropout voltage lt1083 load regulation lt1083 short-circuit current typical perfor a ce characteristics uw
6 lt1083/lt1084/lt1085 fixed 30 40 50 20 10 0 60 70 80 frequency (hz) ripple rejection (db) 10 1k 10k 100k 1083/4/5 fixed 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 i out = i fullload lt1083/4/5-12 ripple rejection lt1085 maximum power dissipation* case temperature ( c) 50 power (w) 50 40 30 20 10 0 lt1083/4/5 fixed g17 60 70 80 90 100 110 120 130 140 150 lt1085mk lt1085ct lt1085ck * as limited by maximum junction temperature lt1084 maximum power dissipation* case temperature ( c) 50 power (w) 60 50 40 30 20 10 0 lt1083/4/5 fixed g16 60 70 80 90 100 110 120 130 140 150 lt1084mk lt1084ct lt1084cp * as limited by maximum junction temperature lt1084ck case temperature ( c) 50 power (w) 100 90 80 70 60 50 40 30 20 10 0 lt1083/4/5 fixed g15 60 70 80 90 100 110 120 130 140 150 lt1083mk lt1083cp lt1083ck * as limited by maximum junction temperature lt1083 maximum power dissipation* output current (0 to i fullload ) 0 ripple rejection (db) 100 90 80 70 60 50 40 30 20 10 0 0.4 0.8 1.0 1083/4/5 fixed g14 0.2 0.6 f r = 120hz v ripple 3v p-p f r = 20khz v ripple 0.5v p-p lt1083/4/5-12 ripple rejection vs current lt1083/4/5-5 ripple rejection vs current lt1083/4/5-5 ripple rejection output current (0 to i fullload ) 0 ripple rejection (db) 100 90 80 70 60 50 40 30 20 10 0 0.4 0.8 1.0 1083/4/5 fixed g11 0.2 0.6 f r = 120hz v ripple 3v p-p f r = 20khz v ripple 0.5v p-p temperature ( c) ?0 output voltage change (%) 0 1.0 150 lt1183/4/5 fixed g12 1.0 2.0 0 50 100 2.0 ?5 25 75 125 temperature stability 30 40 50 20 10 0 60 70 80 frequency (hz) ripple rejection (db) 10 1k 10k 100k 1083/4/5 fixed g10 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 i out = i fullload typical perfor a ce characteristics uw
7 lt1083/lt1084/lt1085 fixed the lt1083 family of three-terminal regulators are easy to use and have all the protection features that are expected in high performance voltage regulators. they are short circuit protected, have safe area protection as well as thermal shutdown to turn off the regulator should the temperature exceed about 165 c. these regulators offer lower dropout voltage and more precise reference tolerance. further, the reference stabil- ity with temperature is improved over older types of regulators. the only circuit difference between using the lt1083 family and older regulators is that they require 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 aluminum 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. 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 capacitance further improve stability and transient response of the lt1083 regulators. another possible stability problem that can occur in monolithic 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 negitive resistance since increasing voltage causes current to decrease. negitive resistance during current limit is not unique to the lt1083 series and has been present on all power ic regulators. the value of negative resistance is a function of how fast the current limit is thermal limit gnd v out lt1083/4/5 bd v in + block diagra w applicatio s i for atio wu uu
8 lt1083/lt1084/lt1085 fixed 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. the problem occurs with a heavy output load when the input voltage is high and the output voltage is low, such as immediately after a 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 operat- ing 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 in applications that require improved ripple rejection the lt1083 series adjustable regulators should be used. with lt1083 series adjustable regulators the addition of a bypass capacitor from the adjust pin to ground will reduce output ripple by the ratio of v out /1.25v. see lt1083 series adjustable regulator data sheet. load regulation because the lt1083 is a three-terminal device, it is not possible to provide true remote load sensing. load regu- lation will not be limited by the resistance of the wire connecting the regulator to the load. the data sheet specification for the load regulation is measured at the bottom of the package. negative side sensing is a true kelvin connection, with the ground pin of the device returned to the negative side of the load. 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, folded back as input-to- output voltage increases. this negative resistance can react with capacitors or inductors on the input to cause oscillations 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, 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 capacitances it is very difficult to get those values of surge current in normal operation. only with high value output capacitors, such as 1000 m f to 5000 m f and with the 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 sup- ply cycling or even plugging and unplugging in the system will not generate currents large enough to do any damage. in out adj v out lt1083 d1 1n4002 (optional) v in 1083/4/5 ai01 c out 150 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 applicatio s i for atio wu uu
9 lt1083/lt1084/lt1085 fixed case- to-heat sink interface, and heat sink resistance itself. new thermal resistance specifications have been devel- oped to more accurately reflect device temperature and ensure safe operating temperatures. the data section for these new regulators provides a separate thermal resis- tance and maximum junction temperature for both the control section and the power section . previous regula- tors, with a single junction-to-case thermal resistance specification, used an average of the two values provided here and therefore could allow excessive junction tem- peratures under certain conditions of ambient tempera- ture 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 electroni- 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 electronically connected to the ouput. for example, using a lt1083-5cp (to-3p, 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 p 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 + 0.5 c/w) = 118 c 118 c < 125 c = t jmax (control section commer- cial 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 commer- cial range) in both cases the junction temperature is below the maximum rating for the respective sections, ensuring reliable operation. high efficiency regulator + 28v input 28v 470 w 28v 4n28 1n914 1n914 lt1011 10k 10k 10k 1k 1m mr1122 1mh 10,000 f output lt1083-5 out in gnd lt1083/4/5 ta03 + applicatio s i for atio wu uu typical applicatio s u paralleling regulators lt1083-5 out in v in v out = 5v i out = 0a to 15a gnd lt1083-5 0.015 w out 2 feet #18 wire* in gnd *the #18 wire acts as ballast resistance insuring current sharing between both devices lt1083/4/5 ta04
10 lt1083/lt1084/lt1085 fixed 7.5a regulator 15v 15v 15v 110vac t1 triad f-269u + + + + + out in lt1083-12 out in gnd c30b c30b 34 20 w 20 w 1 2 l 1mh t2 1n4003 1n4148 1n4003 1n914 c1 50,000 f 100 f lt1004-1.2 1n4003 1 f 0.1 f 1 f 100pf 560 w 16k* 16k* 11k* 11k* 12v 0a 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 15k 10k 2n3904 nc 8 6 7 1 lt1011 lt1011 lm301a * 1% film resistor l-dale to-5 type t2-stancor 11z-2003 regulator with scr preregulator to lower power dissipation. about 1.7v differential is maintained across the lt1083 independent of load current. lt1083/4/5 ta05 typical applicatio s u dimension in inches (millimeters) unless otherwise noted. u package descriptio m package 3-lead plastic dd pak (ltc dwg # 05-08-1460) 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
11 lt1083/lt1084/lt1085 fixed 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. dimension in inches (millimeters) unless otherwise noted. u package descriptio t package 3-lead plastic to-220 (ltc dwg # 05-08-1420) k package 2-lead to-3 metal can (ltc dwg # 05-08-1310) p package 3-lead plastic to-3p (similar to to-247) (ltc dwg # 05-08-1450) 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) 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) 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
12 lt1083/lt1084/lt1085 fixed ? linear technology corporation 1994 1083ffc lt/lcg 1100 2k rev c ? printed in usa v in 50 w lt1084-5 lt1083/4/5 ta09 5.2v line 5.0v battery lt1084-5 select for charge rate 6.5v 100 f 10 f 10 f + + + adjusting output voltage v in > 11.5v 5v out lt1085-5 lt1029 lt1083/4/5 ta07 10v 10 f 100 f + + regulator with reference v in v out = ?2v lt1083/4/5 ta08 10,000 f floating input 100 f lt1084-12 out in gnd + + low dropout negative supply battery backed up regulated supply v in > 12v lt1085-5 lt1083/4/5 ta06 5v to 10v 10 f *optional improves ripple rejection 10 f* 1k 100 f + + + typical applicatio s u related parts part number description comments lt1129 700ma micropower low dropout regulator 50 m a quiescent current lt1175 500ma negative low dropout micropower regulator 45 m a i q , 0.26v dropout voltage, sot-223 package lt1374 4.5a, 500khz step-down converter 4.5a, 0.07 w internal switch, so-8 package lt1529 3a low dropout regulator with 50 m a i q 500mv dropout voltage lt1573 ultrafast tm transient response low dropout regulator drives external pnp lt1575 ultrafast transient response low dropout regulator drives external n-channel mosfet lt1580 7a, very low dropout regulator 0.54v dropout at 7a, fixed 2.5v out and adjustable lt1581 10a, very low dropout regulator 0.63v dropout at 10a, fixed 2.5v out and adjustable lt1584/85/87 7a/4.6a/3a fast response ldos fast transient response for microprocessor applications lt1735 synchronous step-down converter high efficiency, opti-loop tm compensation lt1761 series 100ma, low noise, low dropout micropower regulators in sot-23 20 m a quiescent current, 20 m v rms noise, sot-23 package lt1762 series 150ma, low noise, ldo micropower regulators 25 m a quiescent current, 20 m v rms noise, msop package lt1763 series 500ma, low noise ldo micropower regulators 30 m a quiescent current, 20 m v rms noise, so-8 package lt1764 3a low noise fast transient response ldo 40 m v rms noise, 5-lead dd package lt1962 300ma, low noise ldo micropower regulator 20 m v rms noise, msop package lt1963 1.5a, low noise, fast transient response ldo 40 m v rms noise, sot-223 package ultrafast and opti-loop are trademarks of linear technology corporation. linear technology corporation 1630 mccarthy blvd., milpitas, ca 95035-7417 (408) 432-1900 l fax: (408) 434-0507 l www.linear-tech.com

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