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lt3009 series 1 3009fd temperature (c) dropout voltage (mv) quiescent current (a) 400 3009 ta01b 200 100 50 0 500300 250 150 4.0 350 3.52.0 1.0 0.5 0 5.0 450 4.53.0 2.5 1.5 i q C50 C25 0 25 50 75 100 125 150 i load = 20ma dropoutvoltage typical application features applications description 3 a i q , 20ma low dropout linear regulators the lt ? 3009 series are micropower, low dropout voltage (ldo) linear regulators. the devices supply 20ma output current with a dropout voltage of 280mv. no-load quiescent current is 3a. ground pin current remains at less than 5% of output current as load increases. in shutdown, quiescent current is less than 1a. the lt3009 regulators optimize stability and transient response with low esr ceramic capacitors, requiring a minimum of only 1f. the regulators do not require the addition of esr as is common with other regulators. internal protection circuitry includes current limiting, thermal limiting, reverse-battery protection and reverse- current protection. the lt3009 series are ideal for applications that require moderate output drive capability coupled with ultralow standby power consumption. the device is available in ? xed output voltages of 1.2v, 1.5v, 1.8v, 2.5v, 3.3v and 5v, and as an adjustable device with an output voltage range down to the 600mv reference. the lt3009 is available in the 6-lead dfn and 8-lead sc70 packages. l , lt, ltc, ltm, linear technology and the linear logo are registered trademarks of linear technology corporation. all other trademarks are the property of their respective owners. 3.3v, 20ma supply with shutdown n ultralow quiescent current: 3a n input voltage range: 1.6v to 20v n output current: 20ma n dropout voltage: 280mv n adjustable output (v adj = v out(min) = 600mv) n fixed output voltages: 1.2v, 1.5v, 1.8v, 2.5v, 3.3v, 5v n output tolerance: 2% over load, line and temperature n stable with low esr, ceramic output capacitors (1f minimum) n shutdown current: <1a n current limit protection n reverse-battery protection n thermal limit protection n 8-lead sc70 and 2mm 2mm dfn packages n low current battery-powered systems n keep-alive power supplies n remote monitoring utility meters hotel door locks in shdn 1f 3009 ta01a out v in 3.75v to 20v gnd lt3009-3.3 v out 3.3v20ma 1f dropout voltage/quiescent current downloaded from: http:///
lt3009 series 2 3009fd pin configuration absolute maximum ratings in pin voltage .........................................................22v out pin voltage ......................................................22v input-to-output differential voltage ........................22v adj pin voltage ......................................................22v shdn pin voltage (note 8) .....................................22v output short-circuit duration .......................... inde? nite (note 1) top view gndshdn in adj/nc* outout dc package 6-lead (2mm s 2mm) plastic dfn 4 5 7 6 3 2 1 t jmax = 125c, ja = 65c/w to 85c/w** exposed pad (pin 7) is gnd, must be soldered to pcb shdn 1 gnd 2gnd 3 gnd 4 8 nc7 adj/nc* 6 out 5 in top view sc8 package 8-lead plastic sc70 t jmax = 125c, ja = 75c/w to 95c/w** operating junction temperature range (notes 2, 3) (e, i grades) ......................................C40c to 125c storage temperature range ...................C65c to 150c lead temperature: soldering, 10 sec sc8 package only ............................................. 300c order information lead free finish tape and reel part marking* package description temperature range lt3009edc#pbf lt3009edc#trpbf lcqx 6-lead (2mm 2mm) plastic dfn C40c to 125c lt3009idc#pbf lt3009idc#trpbf lcqx 6-lead (2mm 2mm) plastic dfn C40c to 125c lt3009edc-1.2#pbf lt3009edc-1.2#trpbf ldtw 6-lead (2mm 2mm) plastic dfn C40c to 125c lt3009idc-1.2#pbf lt3009idc-1.2#trpbf ldtw 6-lead (2mm 2mm) plastic dfn C40c to 125c lt3009edc-1.5#pbf lt3009edc-1.5#trpbf ldvb 6-lead (2mm 2mm) plastic dfn C40c to 125c lt3009idc-1.5#pbf lt3009idc-1.5#trpbf ldvb 6-lead (2mm 2mm) plastic dfn C40c to 125c lt3009edc-1.8#pbf lt3009edc-1.8#trpbf ldkc 6-lead (2mm 2mm) plastic dfn C40c to 125c lt3009idc-1.8#pbf lt3009idc-1.8#trpbf ldkc 6-lead (2mm 2mm) plastic dfn C40c to 125c lt3009edc-2.5#pbf lt3009edc-2.5#trpbf ldty 6-lead (2mm 2mm) plastic dfn C40c to 125c lt3009idc-2.5#pbf lt3009idc-2.5#trpbf ldty 6-lead (2mm 2mm) plastic dfn C40c to 125c lt3009edc-3.3#pbf lt3009edc-3.3#trpbf ldkd 6-lead (2mm 2mm) plastic dfn C40c to 125c lt3009idc-3.3#pbf lt3009idc-3.3#trpbf ldkd 6-lead (2mm 2mm) plastic dfn C40c to 125c lt3009edc-5#pbf lt3009edc-5#trpbf ldkf 6-lead (2mm 2mm) plastic dfn C40c to 125c lt3009idc-5#pbf lt3009idc-5#trpbf ldkf 6-lead (2mm 2mm) plastic dfn C40c to 125c * the adj pin is not connected in ? xed output voltage versions. ** see the applications information section. downloaded from: http:///
lt3009 series 3 3009fd lead free finish tape and reel part marking* package description temperature range lt3009esc8#pbf lt3009esc8#trpbf lcqy 8-lead plastic sc70 C40c to 125c lt3009esc8-1.2#pbf lt3009esc8-1.2#trpbf ldtx 8-lead plastic sc70 C40c to 125c lt3009esc8-1.5#pbf lt3009esc8-1.5#trpbf ldvc 8-lead plastic sc70 C40c to 125c lt3009esc8-1.8#pbf lt3009esc8-1.8#trpbf ldkg 8-lead plastic sc70 C40c to 125c lt3009esc8-2.5#pbf lt3009esc8-2.5#trpbf ldtz 8-lead plastic sc70 C40c to 125c lt3009esc8-3.3#pbf lt3009esc8-3.3#trpbf ldkh 8-lead plastic sc70 C40c to 125c lt3009esc8-5#pbf lt3009esc8-5#trpbf ldkj 8-lead plastic sc70 C40c to 125c lead based finish tape and reel part marking* package description temperature range lt3009edc lt3009edc#tr lcqx 6-lead (2mm 2mm) plastic dfn C40c to 125c lt3009idc lt3009idc#tr lcqx 6-lead (2mm 2mm) plastic dfn C40c to 125c lt3009edc-1.2 lt3009edc-1.2#tr ldtw 6-lead (2mm 2mm) plastic dfn C40c to 125c lt3009idc-1.2 lt3009idc-1.2#tr ldtw 6-lead (2mm 2mm) plastic dfn C40c to 125c lt3009edc-1.5 lt3009edc-1.5#tr ldvb 6-lead (2mm 2mm) plastic dfn C40c to 125c lt3009idc-1.5 lt3009idc-1.5#tr ldvb 6-lead (2mm 2mm) plastic dfn C40c to 125c lt3009edc-1.8 lt3009edc-1.8#tr ldkc 6-lead (2mm 2mm) plastic dfn C40c to 125c lt3009idc-1.8 lt3009idc-1.8#tr ldkc 6-lead (2mm 2mm) plastic dfn C40c to 125c lt3009edc-2.5 lt3009edc-2.5#tr ldty 6-lead (2mm 2mm) plastic dfn C40c to 125c lt3009idc-2.5 lt3009idc-2.5#tr ldty 6-lead (2mm 2mm) plastic dfn C40c to 125c lt3009edc-3.3 lt3009edc-3.3#tr ldkd 6-lead (2mm 2mm) plastic dfn C40c to 125c lt3009idc-3.3 lt3009idc-3.3#tr ldkd 6-lead (2mm 2mm) plastic dfn C40c to 125c lt3009edc-5 lt3009edc-5#tr ldkf 6-lead (2mm 2mm) plastic dfn C40c to 125c lt3009idc-5 lt3009idc-5#tr ldkf 6-lead (2mm 2mm) plastic dfn C40c to 125c lt3009esc8 lt3009esc8#tr lcqy 8-lead plastic sc70 C40c to 125c lt3009esc8-1.2 lt3009esc8-1.2#tr ldtx 8-lead plastic sc70 C40c to 125c lt3009esc8-1.5 lt3009esc8-1.5#tr ldvc 8-lead plastic sc70 C40c to 125c lt3009esc8-1.8 lt3009esc8-1.8#tr ldkg 8-lead plastic sc70 C40c to 125c lt3009esc8-2.5 lt3009esc8-2.5#tr ldtz 8-lead plastic sc70 C40c to 125c lt3009esc8-3.3 lt3009esc8-3.3#tr ldkh 8-lead plastic sc70 C40c to 125c lt3009esc8-5 lt3009esc8-5#tr ldkj 8-lead plastic sc70 C40c to 125c consult ltc marketing for parts speci? ed with wider operating temperature ranges. *the temperature grade is identi? ed by a label on the shipping container. for more information on lead free part marking, go to: http://www.linear.com/leadfree/ for more information on tape and reel speci? cations, go to: http://www .linear.com/tapeandreel/ order information downloaded from: http:///
lt3009 series 4 3009fd parameter conditions min typ max units operating voltage l 1.6 20 v regulated output voltage (note 4) lt3009-1.2: v in = 1.7v, i load = 100a 1.7v < v in < 20v, 1a < i load < 20ma l 1.1881.176 1.21.2 1.2121.224 vv lt3009-1.5: v in = 2v, i load = 100a 2v < v in < 20v, 1a < i load < 20ma l 1.4851.470 1.51.5 1.5151.530 vv lt3009-1.8: v in = 2.3v, i load = 100a 2.3v < v in < 20v, 1a < i load < 20ma l 1.7821.764 1.81.8 1.8181.836 vv lt3009-2.5: v in = 3v, i load = 100a 3v < v in < 20v, 1a < i load < 20ma l 2.475 2.45 2.52.5 2.525 2.55 vv lt3009-3.3: v in = 3.8v, i load = 100a 3.8v < v in < 20v, 1a < i load < 20ma l 3.2673.234 3.33.3 3.3333.366 vv lt3009-5: v in = 5.5v, i load = 100a 3.8v < v in < 20v, 1a < i load < 20ma l 4.9504.900 55 5.0505.100 vv adj pin voltage (notes 3, 4) v in = 1.6v, i load = 100a 1.6v < v in < 20v, 1a < i load < 20ma l 594588 600600 606612 mvmv line regulation (note 3) lt3009-1.2: v in = 1.7v to 20v, i load = 1ma lt3009-1.5: v in = 2.0v to 20v, i load = 1ma lt3009-1.8: v in = 2.3v to 20v, i load = 1ma lt3009-2.5: v in = 3.0v to 20v, i load = 1ma lt3009-3.3: v in = 3.8v to 20v, i load = 1ma lt3009-5: v in = 5.5v to 20v, i load = 1ma lt3009: v in = 1.6v to 20v, i load = 1ma ll l l l l l 0.81.0 1.2 1.7 2.2 3.3 0.4 3.03.8 4.5 6.3 8.3 12.5 1.5 mvmv mv mv mv mv mv load regulation (note 3) lt3009-1.2: v in = 1.7v, i load = 1a to 20ma lt3009-1.5: v in = 2v, i load = 1a to 20ma lt3009-1.8: v in = 2.3v, i load = 1a to 20ma lt3009-2.5: v in = 3v, i load = 1a to 20ma lt3009-3.3: v in = 3.8v, i load = 1a to 20ma lt3009-5: v in = 5.5v, i load = 1a to 20ma lt3009: v in = 1.6v, i load = 1a to 20ma ll l l l l l 1.41.8 2.1 2.9 3.9 5.8 0.7 6 7.59.0 12.516.5 25 3 mvmv mv mv mv mv mv dropout voltage v in = v out(nominal) (notes 5, 6) i load = 100a i load = 100a l 115 180 250 mvmv i load = 1ma i load = 1ma l 170 250 350 mvmv i load = 10ma i load = 10ma l 250 310 410 mvmv i load = 20ma i load = 20ma l 280 350 450 mvmv quiescent current (notes 6, 7) i load = 0a i load = 0a l 3 6 aa gnd pin currentv in = v out(nominal) + 0.5v (notes 6, 7) i load = 0a i load = 100a i load = 1ma i load = 10ma i load = 20ma ll l l l 36 23 200450 6 1250 500 1000 aa a a a electrical characteristics the l denotes the speci? cations which apply over the full operating temperature range, otherwise speci? cations are at t j = 25c. (note 2) downloaded from: http:///
lt3009 series 5 3009fd note 1: stresses beyond those listed under absolute maximum ratings may cause permanent damage to the device. exposure to any absolute maximum rating condition for extended periods may affect device reliability and lifetime. note 2: the lt3009 regulators are tested and speci? ed under pulse load conditions such that t j t a . the lt3009e is guaranteed to meet performance speci? cations from 0c to 125c operating junction temperature. speci? cations over the C40 c to 125c operating junction temperature range are assured by design, characterization and correlation with statistical process controls. the lt3009i is guaranteed over the full C40c to 125c operating junction temperature range. note 3: the lt3009 adjustable version is tested and speci? ed for these conditions with the adj pin connected to the out pin.note 4: operating conditions are limited by maximum junction temperature. the regulated output voltage speci? cation will not apply for all possible combinations of input voltage and output current. when operating at the maximum input voltage, the output current range must be limited. when operating at the maximum output current, the input voltage must be limited. note 5: dropout voltage is the minimum input to output voltage differential needed to maintain regulation at a speci? ed output current. in dropout, the output voltage equals (v in C v dropout ). for the lt3009-1.2, dropout voltage will be limited by the minimum input voltage under some voltage/load conditions. note 6: to satisfy minimum input voltage requirements, the lt3009 adjustable version is tested and speci? ed for these conditions with an external resistor divider (61.9k bottom, 280k top) which sets v out to 3.3v. the external resistor divider adds 9.69a of dc load on the output. this external current is not factored into gnd pin current. note 7: gnd pin current is tested with v in = v out(nominal) + 0.5v and a current source load. gnd pin current will increase in dropout. for the ? xed output voltage versions, an internal resistor divider will add to the gnd pin current ( 2a for the lt3009-5, 1a for the lt3009-1.2, lt3009-1.5, lt3009-1.8, lt3009-2.5 and lt3009-3.3). see the gnd pin current curves in the typical performance characteristics section. note 8: the shdn pin can be driven below gnd only when tied to the in pin directly or through a pull-up resistor. if the shdn pin is driven below gnd by more than C0.3v while in is powered, the output will turn on. note 9: output noise is listed for the adjustable version with the adj pin connected to the out pin. see the rms output noise vs load current curve in the typical performance characteristics section. parameter conditions min typ max units output voltage noise (note 9) c out = 1f, i load = 20ma, bw = 10hz to 100khz 150 v rms adj pin bias current l C10 0.3 10 na shutdown threshold v out = off to on v out = on to off ll 0.2 0.660.36 1.5 v v shdn pin current v shdn = 0v, v in = 20v v shdn = 20v, v in = 20v ll 0.5 1 1.6 aa quiescent current in shutdown v in = 6v, v shdn = 0v l <1 a ripple rejection (note 3) v in C v out = 1.5v, v ripple = 0.5v p-p , f ripple = 120hz, i load = 20ma lt3009 lt3009-1.2 lt3009-1.5 lt3009-1.8 lt3009-2.5 lt3009-3.3 lt3009-5 6057 55.5 5452 49 44 7268 67 66 63 61 56 dbdb db db db db db current limit v in = 20v, v out = 0 v in = v out(nominal) + 1v, v out = C 5% l 22 60 ma ma input reverse leakage current v in = C20v, v out = 0 l 200 350 a reverse output current v out = 1.2v, v in = 0 0.6 10 a electrical characteristics the l denotes the speci? cations which apply over the full operating temperature range, otherwise speci? cations are at t j = 25c. (note 2) downloaded from: http:///
lt3009 series 6 3009fd 0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 temperature (c) minimum input voltage (v) 3009 g03 i load = 20ma C50 C25 0 25 50 75 100 125 150 output current (ma) 0 0 dropout voltage (mv) 50 150 200 250 10 20 450 100 51 5 300 350 400 3009 g01 t a = 125c t a = 25c i load = 20ma temperature (c) 0 dropout voltage (mv) 50 150 200 250 450 100 300 350 400 3009 g02 20ma 10ma 1ma 100 a C50 C25 0 25 50 75 100 125 150 typical performance characteristics dropout voltage dropout voltage minimum input voltage adj pin voltage temperature (c) adj pin voltage (v) 3009 g04 0.596 0.608 0.610 0.6120.590 0.592 0.604 0.600 0.594 0.6060.588 0.602 0.598 C50 C25 0 25 50 75 100 125 150 i load = 100a t a = 25c, unless otherwise noted. output voltage lt3009-1.2 output voltage lt3009-1.5 temperature (c) output voltage (v) 3009 g27 1.192 1.216 1.220 1.2241.180 1.184 1.208 1.200 1.188 1.2121.176 1.204 1.196 C50 C25 0 25 50 75 100 125 150 i load = 100a output voltage lt3009-2.5 output voltage lt3009-3.3 temperature (c) output voltage (v) 3009 g06 3.278 3.344 3.355 3.3663.245 3.256 3.322 3.300 3.267 3.3333.234 3.311 3.289 C50 C25 0 25 50 75 100 125 150 i load = 100a output voltage lt3009-1.8 temperature (c) output voltage (v) 3009 g05 1.788 1.824 1.830 1.8361.770 1.776 1.812 1.800 1.782 1.8181.764 1.806 1.794 C50 C25 0 25 50 75 100 125 150 i load = 100a temperature (c) output voltage (v) 3009 g28 1.490 1.520 1.525 1.5301.475 1.480 1.510 1.500 1.485 1.5151.470 1.505 1.495 C50 C25 0 25 50 75 100 125 150 i load = 100a temperature (c) output voltage (v) 3009 g29 2.47 2.53 2.54 2.552.51 2.49 2.46 2.522.45 2.50 2.48 C50 C25 0 25 50 75 100 125 150 i load = 100a downloaded from: http:///
lt3009 series 7 3009fd typical performance characteristics t a = 25c, unless otherwise noted. adj pin bias current adjustable version quiescent current output voltage lt3009-5 temperature (c) output voltage (v) 3009 g07 5.000 5.1004.925 4.950 5.050 4.9754.900 5.075 5.025 C50 C25 0 25 50 75 100 125 150 i load = 100a C10 C8 C4C6 C2 0 2 4 6 8 10 temperature (c) adj pin bias current (na) 3009 g08 C50 C25 0 25 50 75 100 125 150 0 1 32 4 5 6 temperature (c) quiescent current (a) 3009 g09 C50 C25 0 25 50 75 100 125 150 quiescent current quiescent current gnd pin current lt3009-1.2 0 200 450 500 2 4 6 100 350150 400 50 0 300 250 1 3 8 10 5 7 9 3009 g31 input voltage (v) gnd pin current (a) r l = 60, i l = 20ma r l = 120, i l = 10ma r l = 1.2k, i l = 1ma r l = 12k, i l = 100a 0 8 18 20 2 4 6 4 14 6 16 20 12 10 1 3 8 10 5 7 9 3009 g10 input voltage (v) quiescent current (a) lt3009-1.2lt3009-1.5 lt3009-1.8 0 8 18 20 2 4 6 4 14 6 16 20 12 10 1 3 8 10 5 7 9 3009 g30 input voltage (v) quiescent current (a) lt3009-2.5lt3009-3.3 lt3009-5 downloaded from: http:///
lt3009 series 8 3009fd load (ma) 0.001 1 gnd current (a) 10 100 1000 0.01 0.1 1 10 100 3009 g14 v in = 3.8v v out = 3.3v gnd pin current vs i load gnd pin current lt3009-5 gnd pin current lt3009-3.3 02 4 6 1 3 8 10 5 7 9 3009 g12 input voltage (v) gnd pin current (a) r l = 165, i l = 20ma r l = 330, i l = 10ma r l = 3.3k, i l = 1ma 200 450 500100 350150 400 50 0 300 250 r l = 33k, i l = 100a 0 200 450 2 4 6 100 350150 400 50 0 300 250 1 3 8 10 5 7 9 3009 g13 input voltage (v) gnd pin current (a) r l = 250, i l = 20ma r l = 500, i l = 10ma r l = 5k, i l = 1ma r l = 50k, i l = 100a typical performance characteristics t a = 25c, unless otherwise noted. gnd pin current lt3009-1.5 0 200 450 500 2 4 6 100 350150 400 50 0 300 250 1 3 8 10 5 7 9 3009 g32 input voltage (v) gnd pin current (a) r l = 75, i l = 20ma r l = 150, i l = 10ma r l = 1.5k, i l = 1ma r l = 15k, i l = 100a gnd pin current lt3009-1.8 0 200 450 500 2 4 6 100 350150 400 50 0 300 250 1 3 8 10 5 7 9 3009 g11 input voltage (v) gnd pin current (a) r l = 90, i l = 20ma r l = 180, i l = 10ma r l = 1.8k, i l = 1ma r l = 18k, i l = 100a gnd pin current lt3009-2.5 0 200 450 500 2 4 6 100 350150 400 50 0 300 250 1 3 8 10 5 7 9 3009 g33 input voltage (v) gnd pin current (a) r l = 125, i l = 20ma r l = 250, i l = 10ma r l = 2.5k, i l = 1ma r l = 25k, i l = 100a downloaded from: http:///
lt3009 series 9 3009fd shdn pin input current (na) 300 400 500200 100 250 350 450150 50 0 3009 g16 shdn pin voltage (v) 4 8 12 16 20 2 0 6 10 14 18 shdn pin thresholds shdn pin input current shdn pin input current current limit 0 200 600400 800 1000 1200 1400 1600 temperature (c) shdn pin input current (na) 3009 g17 C50 C25 0 25 50 75 100 125 150 v shdn = 20v 0 10 3020 40 50 60 70 temperature (c) current limit (ma) 3009 g18 C50 C25 0 25 50 75 100 125 150 v in = 1.6v v in = 20v 0 0.2 0.60.4 0.8 1.0 1.2 1.4 temperature (c) 3009 g15 C50 C25 0 25 50 75 100 125 150 shdn pin threshold voltage (v) off to on on to off reverse output current input ripple rejection typical performance characteristics t a = 25c, unless otherwise noted. 0 5 1510 20 25 30 35 40 45 50 temperature (c) reverse output current (a) 3009 g19 out adj C50 C25 0 25 50 75 100 125 150 out = adj = 1.2vin = shdn = gnd frequency (hz) 0 input ripple rejection (db) 10 30 40 50 90 20 60 70 80 3009 g20 4.7f 1f 10 100 1k 10k 100k 1m v in = 2v + 50mv rms v out = 600mv i load = 20ma downloaded from: http:///
lt3009 series 10 3009fd typical performance characteristics t a = 25c, unless otherwise noted. input ripple rejection load regulation output noise spectral density rms output noise vs load current (10hz to 100khz) transient response transient response C1.0 C0.5 0.5 0 1.0 1.5 2.0 2.5 3.0 temperature (c) load regulation (mv) 3009 g22 C50 C25 0 25 50 75 100 125 150 i l = 1a to 20ma v out = 600mv v in = 1.6v 0 10 3020 40 50 60 70 80 temperature (c) input ripple rejection (db) 3009 g21 C50 C25 0 25 50 75 100 125 150 v in = v out (nominal) + 1v + 0.5v p-p ripple at f = 120hzi load = 20ma i load (ma) 0.001 500 600 700 10 3009 g24 400300 0.01 0.1 1 100 200 100 0 output noise (v rms ) 600mv 1.8v 1.2v 1.5v 2.5v 3.3v 5v frequency (hz) 0.1 output noise spectral density (v hz ) 1 100 10 3009 g23 10 100 1k 10k 100k 5v3.3v 2.5v 1.8v 1.5v 1.2v 1v 0.6v 500s/div v out 50mv/div i out 20ma/div 3009 g25 i out = 1ma to 20ma v in = 5.5v v out = 5v c out = 1f 500s/div v out 50mv/div i out 20ma/div 3009 g26 i out = 1ma to 20ma v in = 5.5v v out = 5v c out = 4.7f downloaded from: http:///
lt3009 series 11 3009fd pin functions shdn (pin 1/pin 5): shutdown. pulling the shdn pin low puts the lt3009 into a low power state and turns the output off. if unused, tie the shdn pin to v in . the lt3009 does not function if the shdn pin is not connected. the shdn pin cannot be driven below gnd unless tied to the in pin. if the shdn pin is driven below gnd while in is powered, the output will turn on. shdn pin logic cannot be referenced to a negative rail.gnd (pins 2, 3, 4/pin 6): ground. connect the bottom of the resistor divider that sets output voltage directly to gnd for the best regulation. in (pin 5/pin 4): input. the in pin supplies power to the device. the lt3009 requires a bypass capacitor at in if the device is more than six inches away from the main input ? lter capacitor. in general, the output impedance of a battery rises with frequency, so it is advisable to include a bypass capacitor in battery-powered circuits. a bypass capacitor in the range of 0.1f to 10f will suf- ? ce. the lt3009 withstands reverse voltages on the in pin with respect to ground and the out pin. in the case of a reversed input, which occurs with a battery plugged in backwards, the lt3009 acts as if a large resistor is in series with its input. limited reverse current ? ows into the lt3009 and no reverse voltage appears at the load. the device protects both itself and the load. out (pin 6/pins 2, 3): output. this pin supplies power to the load. use a minimum output capacitor of 1f to prevent oscillations. large load transient applications require larger output capacitors to limit peak voltage transients. see the applications information section for more information on output capacitance and reverse output characteristics. adj (pin 7/pin 1): adjust. this pin is the error ampli? ers inverting terminal. its 300pa typical input bias current ? ows out of the pin (see curve of adj pin bias current vs temperature in the typical performance characteristics section). the adj pin voltage is 600mv referenced to gnd and the output voltage range is 600mv to 19.5v. this pin is not connected in the ? xed output voltage versions. nc (pins 7, 8/pin 1): no connect. for the adjustable voltage version, pin 8 is an nc pin in the sc70 package. for the ? xed voltage versions, pin 7 and pin 8 are nc pins in the sc70 package, and pin 1 is an nc pin in the dfn package. nc pins are not tied to any internal circuitry. they may be ? oated, tied to v in or tied to gnd. exposed pad (pin 7, dfn package only): ground. the exposed pad (backside) of the dfn package is an electri- cal connection to gnd. to ensure optimum performance, solder pin 7 to the pcb and tie directly to pin 6. (sc70/dfn) downloaded from: http:///
lt3009 series 12 3009fd applications information the lt3009 is a low dropout linear regulator with ultra- low quiescent current and shutdown. quiescent current is extremely low at 3a and drops well below 1a in shut- down. the device supplies up to 20ma of output current. dropout voltage at 20ma is typically 280mv. the lt3009 incorporates several protection features, making it ideal for use in battery-powered systems. the device protects itself against both reverse-input and reverse-output voltages. in battery backup applications, where a backup battery holds up the output when the input is pulled to ground, the lt3009 acts as if a blocking diode is in series with its output and prevents reverse current ? ow. in applications where the regulator load returns to a negative supply, the output can be pulled below ground by as much as 22v without affecting startup or normal operation. adjustable operation the lt3009 has an output voltage range of 0.6v to 19.5v. figure 1 shows that output voltage is set by the ratio of two external resistors. the ic regulates the output to maintain the adj pin voltage at 600mv referenced to ground. the current in r1 equals 600mv/r1 and the current in r2 is the current in r1 minus the adj pin bias current. the adj pin bias current, typically 300pa at 25c, ? ows out of the pin. calculate the output voltage using the formula in figure 1. an r1 value of 619k sets the divider current to 0.97a. do not make r1s value any greater than 619k to minimize output voltage errors due to the adj pin bias current and to insure stability under minimum load condi- tions. in shutdown, the output turns off and the divider current is zero. curves of adj pin voltage vs temperature and adj pin bias current vs temperature appear in the typical performance characteristics. speci? cations for output voltages greater than 0.6v are proportional to the ratio of the desired output voltage to 0.6v: v out /0.6v. for example, load regulation for an output current change of 100a to 20ma is C0.7mv typical at v out = 0.6v. at v out = 5v, load regulation is: 5v 0.6v ?( ? 0.7mv) = ? 5.83mv table 1 shows resistor divider values for some com- mon output voltages with a resistor divider current of about 1a. figure 1. adjustable operation table 1. output voltage resistor divider values v out r1 r2 1v 604k 402k 1.2v 604k 604k 1.5v 590k 887k 1.8v 590k 1.18m 2.5v 590k 1.87m 3v 590k 2.37m 3.3v 619k 2.8m 5v 590k 4.32m because the adj pin is relatively high impedance (de-pending on the resistor divider used), stray capacitances at this pin should be minimized. special attention should be given to any stray capacitances that can couple ex- ternal signals onto the adj pin producing undesirable output transients or ripple. extra care should be taken in assembly when using high valued resistors. small amounts of board contamination can lead to signi? cant shifts in output voltage. appro- priate post-assembly board cleaning measures should in shdn r2r1 3009 f0 out v in v out = 600mv* (1 + r2/r1) C (i adj ? r2) v adj = 600mv i adj = 0.3na at 25c output range = 0.6v to 19.5v adj gnd l t3009 v ou t downloaded from: http:///
lt3009 series 13 3009fd be implemented to prevent board contamination. if the board is to be subjected to humidity cycling or if board cleaning measures cannot be guaranteed, consideration should be given to using resistors an order of magnitude smaller than in table 1 to prevent contamination from causing unwanted shifts in the output voltage. output capacitance and transient response the lt3009 is stable with a wide range of output capaci- tors. the esr of the output capacitor affects stability, most notably with small capacitors. use a minimum output capacitor of 1f with an esr of 3 or less to prevent os- cillations. the lt3009 is a micropower device and output load transient response is a function of output capacitance. larger values of output capacitance decrease the peak deviations and provide improved transient response for larger load current changes. give extra consideration to the use of ceramic capacitors. manufacturers make ceramic capacitors with a variety of dielectrics, each with different behavior across tempera- ture and applied voltage. the most common dielectrics applications information dc bias voltage (v) change in value (%) 3009 f02 20 0 C20C40 C60 C80 C100 0 4 8 10 26 12 14 x5r y5v 16 both capacitors are 16v,1210 case size, 10f temperature (c) C50 4020 0 C20C40 C60 C80 C100 25 75 3009 f03 C25 0 50 100 125 y5v change in value (%) x5r both capacitors are 16v,1210 case size, 10f figure 2. ceramic capacitor dc bias characteristics figure 3. ceramic capacitor temperature characteristics are speci? ed with eia temperature characteristic codes of z5u, y5v, x5r and x7r. the z5u and y5v dielectrics provide high c-v products in a small package at low cost, but exhibit strong voltage and temperature coef? cients as shown in figures 2 and 3. when used with a 5v regulator, a 16v 10f y5v capacitor can exhibit an effective value as low as 1f to 2f for the dc bias voltage applied and over the operating temperature range. the x5r and x7r dielectrics yield more stable characteristics and are more suitable for use as the output capacitor. the x7r type has better stability across temperature, while the x5r is less expensive and is available in higher values. one must still exercise care when using x5r and x7r capacitors; the x5r and x7r codes only specify operating temperature range and maximum capacitance change over temperature. capacitance change due to dc bias with x5r and x7r capacitors is better than y5v and z5u capacitors, but can still be signi? cant enough to drop capacitor values below appropriate levels. capacitor dc bias characteristics tend to improve as component case size increases, but expected capacitance at operating voltage should be veri? ed. downloaded from: http:///
lt3009 series 14 3009fd figure 4. noise resulting from tapping on a ceramic capacitor voltage and temperature coef? cients are not the only sources of problems. some ceramic capacitors have a piezoelectric response. a piezoelectric device generates voltage across its terminals due to mechanical stress, similar to the way a piezoelectric accelerometer or micro- phone works. for a ceramic capacitor, the stress can be induced by vibrations in the system or thermal transients. the resulting voltages produced can cause appreciable amounts of noise, especially when a ceramic capacitor is used for noise bypassing. a ceramic capacitor produced figure 4s trace in response to light tapping from a pencil. similar vibration induced behavior can masquerade as increased output voltage noise. applications information thermal considerations the lt3009s maximum rated junction temperature of 125c limits its power-handling capability. two components comprise the power dissipated by the device: 1. output current multiplied by the input/output voltage differential: i out ? (v in C v out ) 2. gnd pin current multiplied by the input voltage: i gnd ? v in gnd pin current is found by examining the gnd pin cur- rent curves in the typical performance characteristics section. power dissipation equals the sum of the two components listed prior. the lt3009 regulator has internal thermal limiting designed to protect the device during overload conditions. for con- tinuous normal conditions, do not exceed the maximum junction temperature rating of 125c. carefully consider all sources of thermal resistance from junction to ambi- ent including other heat sources mounted in proximity to the lt3009. for surface mount devices, heat sinking is accomplished by using the heat spreading capabilities of the pc board and its copper traces. copper board stiffeners and plated through-holes can also be used to spread the heat generated by power devices. 100ms/div v out 500 v/div 3009 f0 4 v out = 0.6v c out = 22f i load = 10a downloaded from: http:///
lt3009 series 15 3009fd the following tables list thermal resistance for several dif-ferent board sizes and copper areas. all measurements were taken in still air on 3/32" fr-4 board with one ounce copper. calculating junction temperature example: given an output voltage of 3.3v, an input volt- age range of 12v 5%, an output current range of 0ma to 20ma and a maximum ambient temperature of 85c, what will the maximum junction temperature be for an application using the dc package? the power dissipated by the device is equal to: i out(max) (v in(max) C v out ) + i gnd (v in(max) ) where, i out(max) = 20ma v in(max) = 12.6v i gnd at (i out = 20ma, v in = 12.6v) = 0.45ma so,p = 20ma(12.6v C 3.3v) + 0.45ma(12.6v) = 191.7mw the thermal resistance will be in the range of 65c/w to 85c/w depending on the copper area. so the junction temperature rise above ambient will be approximately equal to: 0.1917w(75c/w) = 14.4c the maximum junction temperature equals the maximum junction temperature rise above ambient plus the maximum ambient temperature or: t j(max) = 85c + 14.4c = 99.4c table 2: measured thermal resistance for dc package copper area board area thermal resistance (junction-to-ambient) topside* backside 2500mm 2 2500mm 2 2500mm 2 65c/w 1000mm 2 2500mm 2 2500mm 2 70c/w 225mm 2 2500mm 2 2500mm 2 75c/w 100mm 2 2500mm 2 2500mm 2 80c/w 50mm 2 2500mm 2 2500mm 2 85c/w *device is mounted on the topside. table 3: measured thermal resistance for sc70 package copper area board area thermal resistance (junction-to-ambient) topside* backside 2500mm 2 2500mm 2 2500mm 2 75c/w 1000mm 2 2500mm 2 2500mm 2 80c/w 225mm 2 2500mm 2 2500mm 2 85c/w 100mm 2 2500mm 2 2500mm 2 90c/w 50mm 2 2500mm 2 2500mm 2 95c/w *device is mounted on the topside. applications information downloaded from: http:///
lt3009 series 16 3009fd output and adj voltage (v) 0 60 80 100 8 4020 50 70 9030 10 0 2 1 4 3 67 9 5 10 3009 f05 reverse current ( a) out current adj current figure 5. reverse output current protection features the lt3009 incorporates several protection features that make it ideal for use in battery-powered circuits. in ad- dition to the normal protection features associated with monolithic regulators, such as current limiting and thermal limiting, the device also protects against reverse-input voltages, reverse-output voltages and reverse output-to- input voltages. current limit protection and thermal overload protection protect the device against current overload conditions at the output of the device. for normal operation, do not exceed a junction temperature of 125c. the lt3009 in pin withstands reverse voltages of 22v. the device limits current ? ow to less than 1ma (typically less than 220a) and no negative voltage appears at out. the device protects both itself and the load against batteries that are plugged in backwards. the shdn pin cannot be driven below gnd unless tied to the in pin. if the shdn pin is driven below gnd while in is powered, the output will turn on. shdn pin logic cannot be referenced to a negative rail. the lt3009 incurs no damage if out is pulled below ground. if in is left open circuit or grounded, out can be pulled below ground by 22v. no current ? ows from the pass transistor connected to out. however, current ? ows in (but is limited by) the resistor divider that sets output voltage. current ? ows from the bottom resistor in the divider and from the adj pins internal clamp through the top resistor in the divider to the external circuitry pulling out below ground. if in is powered by a voltage source, out sources current equal to its current limit capability and the lt3009 protects itself by thermal limiting if neces- sary. in this case, grounding the shdn pin turns off the lt3009 and stops out from sourcing current. the lt3009 incurs no damage if the adj pin is pulled above or below ground by 22v. if in is left open circuit or grounded, adj acts like a 100k resistor in series with a diode when pulled above or below ground. in circuits where a backup battery is required, several different input/output conditions can occur. the output voltage may be held up while the input is either pulled to ground, pulled to some intermediate voltage or is left open circuit. current ? ow back into the output follows the curve shown in figure 5. if the lt3009 in pin is forced below the out pin or the out pin is pulled above the in pin, input current typically drops to less than 1a. this occurs if the lt3009 input is connected to a discharged (low voltage) battery and either a backup battery or a second regulator circuit holds up the output. the state of the shdn pin has no effect in the reverse current if out is pulled above in. applications information downloaded from: http:///
lt3009 series 17 3009fd typical applications in shdn 3.3v 3009 ta02 out 1f 1f gnd l t3009-3.3 no protectiondiodes needed! v in 12v load: system monitor, volatile memory, etc. in shdn 5v 3009 ta03 out fault 1f supercap 1f sense pwr tomonitoring center gnd gnd l t3009-5 line power v line 12v to 15v d charge r limit line interrupt detect keep-alive power supply last-gasp circuit 0.25 0.05 1.42 0.05 (2 sides) recommended solder pad pitch and dimensions 0.61 0.05 (2 sides) 1.15 0.05 0.70 0.05 2.55 0.05 packageoutline 0.50 bsc 2.00 0.10 (4 sides) note:1. drawing to be made a jedec package outline m0-229 variation of (wccd-2) 2. drawing not to scale 3. all dimensions are in millimeters 4. dimensions of exposed pad on bottom of package do not include mold flash. mold flash, if present, shall not exceed 0.15mm on any side 5. exposed pad shall be solder plated 6. shaded area is only a reference for pin 1 location on the top and bottom of package 0.40 0.10 bottom viewexposed pad 0.56 0.05 (2 sides) 0.75 0.05 r = 0.125 typ r = 0.05 typ 1.37 0.05 (2 sides) 1 3 6 4 pin 1 bar top mark (see note 6) 0.200 ref 0.00 C 0.05 (dc6) dfn rev b 1309 0.25 0.05 0.50 bsc pin 1 notch r = 0.20 or 0.25 45 chamfer dc6 package 6-lead plastic dfn (2mm 2mm) (reference ltc dwg # 05-08-1703 rev b) 5. exposed pad shall be solder plated 6. shaded area is only a reference for pin 1 location on the top and bottom of package package description downloaded from: http:///
lt3009 series 18 3009fd package description sc8 package 8-lead plastic sc70 (reference ltc dwg # 05-08-1639 rev ?) 1.15 C 1.35 (note 4) 1.80 C 2.40 0.15 C 0.27 8 plcs (note 3) sc8 sc70 0905 rev ? 1.80 C 2.20 (note 4) 0.50 bsc pin 1 pin 8 0.80 C 1.00 1.00 max 0.00 C 0.10 ref note:1. dimensions are in millimeters 2. drawing not to scale 3. dimensions are inclusive of plating 4. dimensions are exclusive of mold flash and metal burr 5. mold flash shall not exceed 0.254mm 6. details of the pin 1 identifier are optional, but must be located within the index area 7. eiaj package reference is eiaj sc-70 and jedec mo-203 variation ba 2.8 bsc 0.30 max 0.50 ref recommended solder pad layout per ipc calculator 1.8 ref 1.00 ref index area(note 6) 0.10 C 0.18 (note 3) 0.26 C 0.46 gauge plane 0.15 bsc 0.10 C 0.40 downloaded from: http:///
lt3009 series 19 3009fd 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 representa- tion that the interconnection of its circuits as described herein will not infringe on existing patent rights. revision history rev date description page number d 04/12 clari? ed e-grade operating temperature 5 (revision history begins at rev d) downloaded from: http:///
lt3009 series 20 3009fd linear technology corporation 1630 mccarthy blvd., milpitas, ca 95035-7417 (408) 432-1900 fax: (408) 434-0507 www.linear.com ? linear technology corporation 2007 lt 0412 rev d printed in usa related parts part number description comments lt1761 100ma, low noise micropower ldo v in : 1.8v to 20v, v out = 1.22v, v do = 0.3v, i q = 20a, i sd < 1a, low noise < 20v rms , stable with 1f ceramic capacitors, thinsot tm package lt1762 150ma, low noise micropower ldo v in : 1.8v to 20v, v out = 1.22v, v do = 0.3v, i q = 25a, i sd < 1a, low noise < 20v rms , ms8 package lt1763 500ma, low noise micropower ldo v in : 1.8v to 20v, v out = 1.22v, v do = 0.3v, i q = 30a, i sd < 1a, low noise < 20v rms , s8 package lt1764/lt1764a 3a, low noise, fast transient response ldos v in : 2.7v to 20v, v out = 1.21v, v do = 0.34v, i q = 1ma, i sd < 1a, low noise < 40v rms , a version stable with ceramic capacitors, dd and to220-5 packages ltc1844 150ma, low noise micropower vldo v in : 1.6v to 6.5v, v out(min) = 1.25v, v do = 0.09v, i q = 35a, i sd < 1a, low noise: < 30v rms , thinsot package lt1962 300ma, low noise micropower ldo v in : 1.8v to 20v, v out(min) = 1.22v, v do = 0.27v, i q = 30a, i sd < 1a, low noise: < 20v rms , ms8 package lt1963/lt1963a 1.5a, low noise, fast transient response ldos v in : 2.1v to 20v, v out(min) = 1.21v, v do = 0.34v, i q = 1ma, i sd < 1a, low noise: < 40v rms , a version stable with ceramic capacitors, dd, to220-5, sot223 and s8 packages lt1964 200ma, low noise micropower, negative ldo v in : C2.2v to C20v, v out(min) = 1.21v, v do = 0.34v, i q = 30a, i sd = 3a, low noise: < 30v rms , stable with ceramic capacitors,thinsot package lt3010 50ma, high voltage, micropower ldo v in : 3v to 80v, v out(min) = 1.275v, v do = 0.3v, i q = 30a, i sd < 1a, low noise: < 100v rms , stable with 1f output capacitor, ms8e package lt3012/lt3012b 250ma, high voltage, micropower ldos v in : 4v to 80v, v out(min) = 1.24v, v do = 0.4v, i q = 40a, i sd < 1a, low noise: <100v rms , stable with 3.3f output capacitor, 12-lead 4mm 3mm dfn and 16-lead fe packages lt3013/lt3013b 250ma, high voltage, micropower ldos with pwrgd v in : 4v to 80v, v out(min) = 1.22v, v do = 0.4v, i q = 40a, i sd < 1a, low noise: < 100v rms , stable with 3.3f output capacitor, 12-lead 4mm 3mm dfn and 16-lead fe packages lt3014/lt3014b 20ma, high voltage, micropower ldo v in : 3v to 80v, v out(min) = 1.2v, v do = 0.35v, i q = 7a, i sd < 1a, low noise: < 100v rms , stable with 0.47f output capacitor, sot23-5 and 3mm 3mm dfn packages lt3020 100ma, low voltage vldo v in : 0.9v to 10v, v out(min) = 0.20v, v do = 0.15v, i q = 120a, i sd < 1a, 3mm 3mm dfn and ms8 packages lt3021 500ma, low voltage vldo v in : 0.9v to 10v, v out(min) = 0.20v, v do = 0.16v, i q = 120a, i sd < 3a, 5mm 5mm dfn and so8 packages lt3023 dual 100ma, low noise, micropower ldo v in : 1.8v to 20v, v out(min) = 1.22v, v do = 0.30v, i q = 40a, i sd < 1a, dfn and ms10 packages lt3024 dual 100ma/500ma, low noise, micropower ldo v in : 1.8v to 20v, v out(min) = 1.22v, v do = 0.30v, i q = 60a, i sd < 1a, dfn and tssop- 16e packages ltc3025 300ma, low voltage micropower vldo 45mv dropout voltage, low noise 110v rms , v in = 1.14v to 5.5v, low i q : 54a, 6-lead 2mm 2mm dfn package ltc3026 1.5a, low input voltage vldo 100mv dropout voltage, low noise 80v rms , v in = 0.9v to 5.5v, low i q : 950a, 10-lead 3mm 3mm dfn and ms10e packages lt3027 dual 100ma, low noise, micropower ldo with independent inputs v in : 1.8v to 20v, v out(min) = 1.22v, v do = 0.30v, i q = 40a, i sd < 1a, dfn and ms10e packages lt3028 dual 100ma/500ma, low noise, micropower ldo with independent inputs v in : 1.8v to 20v, v out(min) = 1.22v, v do = 0.30v, i q = 60a, i sd < 1a, dfn and tssop-16e packages thinsot is a trademark of linear technology corporation. downloaded from: http:///

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