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lt3022/lt3022-1.2 lt3022-1.5/lt3022-1.8 1 3022fb typical application features description 1a, 0.9v to 10v, very low dropout linear regulator the lt ? 3022 is a very low dropout voltage (vldo?) linear regulator that operates from single input supplies down to 0.9v. the device supplies 1a output current with 145mv typical dropout voltage. the lt3022 is ideal for low input voltage to low output voltage applications, providing comparable electrical effciency to a switching regulator. the regulator optimizes stability and transient response with low esr ceramic output capacitors as small as 10f. other lt3022 features include 0.05% typical line regulation and 0.05% typical load regulation. in shutdown, quiescent current typically drops to 7.5a. internal protection circuitry includes reverse-battery protection, current limiting, ther - mal limiting with hysteresis and reverse-current protection. the lt3022 is available as an adjustable device with an output voltage range down to the 200mv reference. three fxed output voltages, 1.2v, 1.5v and 1.8v are also offered. the lt3022 regulator is available in the thermally enhanced low profle (0.75mm) 16-lead (5mm 3mm) dfn and msop packages. 1.2v to 0.9v, 1a vldo regulator applications n v in range: 0.9v to 10v n dropout voltage: 145mv typical n output current: 1a n adjustable output (v ref = v out(min) = 200mv) n fixed output voltages: 1.2v, 1.5v , 1.8v n stable with low esr, ceramic output capacitors (10f minimum) n 0.05% typical load regulation from 1ma to 1a n quiescent current: 400a typical n 7.5a typical quiescent current in shutdown n current limit protection n reverse-battery protection with no reverse current n thermal limiting with hysteresis n 16-lead (5mm 3mm) dfn and msop packages n high effciency linear regulators n battery-powered systems n logic supplies n post regulator for switching supplies n wireless modems n fpga core supplies l , lt, ltc, ltm, linear technology and the linear logo are registered trademarks of linear technology corporation. vldo is a trademark of linear technology corporation. all other trademarks are the property of their respective owners. in 10f v in 1.2v v out 0.9v 1a lt3022 shdn 698 1% 200 1% out adj gnd 10f 3022 ta01a minimum input voltage temperature (c) ?50 minimum input voltage (v) 0.3 0.9 1.0 1.1 0 50 75 3022 ta01b 0.1 0.7 0.5 0.2 0.8 0 0.6 0.4 ?25 25 100 125 i l = 1a
lt3022/lt3022-1.2 lt3022-1.5/lt3022-1.8 2 3022fb absolute maximum ratings in pin voltage ........................................................ 10v out pin voltage ..................................................... 10v input-to-output differential voltage ....................... 10v adj/sense pin voltage ......................................... 10v shdn pin voltage .................................................. 10v output short-circuit duration ......................... indefnite (note 1) operating junction temperature range e-, i-grades (notes 2, 3) ................... C40c to 125c storage temperature range ................. C65c to 150c lead temperature (soldering, 10 sec) msop package ................................................ 300c 16 15 14 13 12 11 10 9 17 gnd 1 2 3 4 5 6 7 8 nc nc in in in pgnd pgnd shdn nc nc out out adj agnd agnd nc top view dhc package 16-lead (5mm 3mm) plastic dfn t jmax = 125c, q ja = 38c/w*, q jc = 4c/w exposed pad (pin 17) is gnd, must be soldered to pcb *see the applications information section 1 2 3 4 5 6 7 8 nc nc out out adj/sense* agnd agnd nc 16 15 14 13 12 11 10 9 nc nc in in in pgnd pgnd shdn top view mse package 16-lead plastic msop 17 gnd t jmax = 125c, q ja = 38c/w**, q jc = 5c/w to 10c/w exposed pad (pin 17) is gnd, must be soldered to pcb *pin 5: adj for lt3022 sense for lt3022-1.2/lt3022-1.5/lt3022-1.8 **see the applications information section pin configuration
lt3022/lt3022-1.2 lt3022-1.5/lt3022-1.8 3 3022fb order information lead free finish tape and reel part marking* package description temperature range lt3022edhc#pbf lt3022edhc#trpbf 3022 16-lead (5mm 3mm) plastic dfn C40c to 125c lt3022idhc#pbf lt3022idhc#trpbf 3022 16-lead (5mm 3mm) plastic dfn C40c to 125c lt3022emse#pbf lt3022emse#trpbf 3022 16-lead plastic msop C40c to 125c lt3022imse#pbf lt3022imse#trpbf 3022 16-lead plastic msop C40c to 125c lt3022emse-1.2#pbf lt3022emse-1.2#trpbf 302212 16-lead plastic msop C40c to 125c lt3022imse-1.2#pbf lt3022imse-1.2#trpbf 302212 16-lead plastic msop C40c to 125c lt3022emse-1.5#pbf lt3022emse-1.5#trpbf 302215 16-lead plastic msop C40c to 125c lt3022imse-1.5#pbf lt3022imse-1.5#trpbf 302215 16-lead plastic msop C40c to 125c lt3022emse-1.8#pbf lt3022emse-1.8#trpbf 302218 16-lead plastic msop C40c to 125c lt3022imse-1.8#pbf lt3022imse-1.8#trpbf 302218 16-lead plastic msop C40c to 125c lead based finish tape and reel part marking* package description temperature range lt3022edhc lt3022edhc#tr 3022 16-lead (5mm 3mm) plastic dfn C40c to 125c lt3022idhc lt3022idhc#tr 3022 16-lead (5mm 3mm) plastic dfn C40c to 125c lt3022emse lt3022emse#tr 3022 16-lead plastic msop C40c to 125c lt3022imse lt3022imse#tr 3022 16-lead plastic msop C40c to 125c lt3022emse-1.2 lt3022emse-1.2#tr 302212 16-lead plastic msop C40c to 125c lt3022imse-1.2 lt3022imse-1.2#tr 302212 16-lead plastic msop C40c to 125c lt3022emse-1.5 lt3022emse-1.5#tr 302215 16-lead plastic msop C40c to 125c lt3022imse-1.5 lt3022imse-1.5#tr 302215 16-lead plastic msop C40c to 125c lt3022emse-1.8 lt3022emse-1.8#tr 302218 16-lead plastic msop C40c to 125c lt3022imse-1.8 lt3022imse-1.8#tr 302218 16-lead plastic msop C40c to 125c consult ltc marketing for parts specifed with wider operating temperature ranges. *the temperature grade is identifed 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 specifcations, go to: http://www.linear.com/tapeandreel/
lt3022/lt3022-1.2 lt3022-1.5/lt3022-1.8 4 3022fb electrical characteristics the l denotes the specifcations which apply over the full operating temperature range, otherwise specifcations are at t a = 25c. parameter conditions min typ max units minimum input voltage (notes 4, 6) i load = 1a, t a > 0c i load = 1a, t a 0c 0.9 0.9 1.05 1.10 v v adj pin voltage (notes 5, 6) v in = 1.5v, i load = 1ma 1.15v < v in < 10v, 1ma < i load < 1a l 196 194 200 200 204 206 mv mv regulated output voltage (note 5) lt3022-1.2 v in = 1.5v, i load = 1ma 1.5v < v in < 10v, 1ma < i load <1a l 1.176 1.164 1.200 1.200 1.224 1.236 v v lt3022-1.5 v in = 1.8v, i load = 1ma 1.8v < v in < 10v, 1ma < i load <1a l 1.470 1.455 1.500 1.500 1.530 1.545 v v lt3022-1.8 v in = 2.1v, i load = 1ma 2.1v < v in < 10v, 1ma < i load <1a l 1.764 1.746 1.800 1.800 1.836 1.854 v v line regulation (note 7) lt3022 ?v in = 1.15v to 10v, i load = 1ma lt3022-1.2 ?v in = 1.5v to 10v, i load = 1ma lt3022-1.5 ?v in = 1.8v to 10v, i load = 1ma lt3022-1.8 ?v in = 2.1v to 10v, i load = 1ma l l l l C1.5 C9 C11 C13.5 C0.1 0.6 0.8 1 0.5 3.5 4 5 mv mv mv mv load regulation (note 7) lt3022 v in = 1.15v, ?i load = 1ma to 1a l C0.5 C1.0 0.1 0.5 1.0 mv mv lt3022-1.2 v in = 1.5v, ?i load = 1ma to 1a l C3 C6 0.6 3 6 mv mv lt3022-1.5 v in = 1.8v, ?i load = 1ma to 1a l C3.8 C7.5 1 3.8 7.5 mv mv lt3022-1.8 v in = 2.1v, ?i load = 1ma to 1a l C4.5 C9 1.2 4.5 9 mv mv dropout voltage (notes 8, 9) i load = 10ma l 45 75 135 mv mv i load = 100ma l 55 90 175 mv mv i load = 500ma l 110 150 235 mv mv i load = 1a l 145 185 285 mv mv gnd pin current, v in = v out(nominal) + 0.4v (notes 9, 10) i load = 0ma i load = 1ma i load = 100ma i load = 500ma i load = 1a l l l l 400 1.2 3.4 8.3 18 3.5 8.5 20 36 a ma ma ma ma output voltage noise c out = 10f, i load = 1a, bw = 10hz to 100khz, v out = 1.2v 165 v rms adj pin bias current (notes 7, 11) v adj = 0.2v, v in = 1.5v 30 100 na shutdown threshold v out = off to on v out = on to off l l 0.25 0.64 0.64 0.9 v v shdn pin current (note 12) v shdn = 0v, v in = 10v v shdn = 10v, v in = 10v l l 3 1 9.5 a a quiescent current in shutdown v in = 6v, v shdn = 0v 7.5 15 a
lt3022/lt3022-1.2 lt3022-1.5/lt3022-1.8 5 3022fb 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 lt3022 regulator is tested and specifed under pulse load conditions such that t j t a . the lt3022 is 100% tested at t a = 25c. performance of the lt3022e over the full C40c and 125c operating junction temperature range is assured by design, characterization and correlation with statistical process controls. the lt3022i regulators are guaranteed over the full C40c to 125c operating junction temperature range. high junction temperatures degrade operating lifetime. operating lifetime is derated at junction temperatures greater than 125c. note 3: this ic includes overtemperature protection that is intended to protect the device during momentary overload conditions. junction temperature will exceed 125c when overtemperature protection is active. continuous operation above the specifed maximum operating junction temperature may impair device reliability. note 4: minimum input voltage is the voltage required by the lt3022 to regulate the output voltage and supply the rated 1a output current. this specifcation is tested at v out = 0.2v. for higher output voltages, the minimum input voltage required for regulation equals the regulated output voltage v out plus the dropout voltage or 1.1v, whichever is greater. note 5: maximum junction temperature limits operating conditions. the regulated output voltage specifcation does not apply for all possible combinations of input voltage and output current. limit the output current range if operating at maximum input voltage. limit the input-to-output voltage differential range if operating at maximum output current. note 6: the lt3022 typically supplies 1a output current with a 0.9v input supply. the guaranteed minimum input voltage for 1a output current is 1.10v, especially if cold temperature operation is required. note 7: the lt3022 is tested and specifed for these conditions with adj tied to out. specifcations for fxed output voltage devices are referred to the output voltage. note 8: dropout voltage is the minimum input to output voltage differential needed to maintain regulation at a specifed output current. in dropout the output voltage equals: (v in C v dropout ). note 9: the lt3022 is tested and specifed for these conditions with an external resistor divider (3.92k and 19.6k) setting v out to 1.2v. the external resistor divider adds 50a of load current. note 10: gnd pin current is tested with v in = v out(nominal) + 0.4v and a current source load. gnd pin current increases in dropout. see gnd pin current curves in the typical performance characteristics section. note 11: adjust pin bias current fows out of the adj pin. note 12: shutdown pin current fows into the shdn pin. note 13: the lt3022 is tested and specifed for this condition with an external resistor divider (3.92k and 5.9k) setting v out to 0.5v. the external resistor divider adds 50a of load current. the specifcation refers to the change in the 0.2v reference voltage, not the 0.5v output voltage. specifcations for fxed output voltage devices are referred to the output voltage. note 14: input reverse leakage current fows out of the in pin. note 15: reverse output current is tested with in grounded and out forced to the rated output voltage. this current fows into the out pin and out of the gnd pin. note 16: reverse current is higher for the case of (rated_output) < v out < v in , because the no-load recovery circuitry is active in this region and is trying to restore the output voltage to its nominal value. parameter conditions min typ max units ripple rejection (note 13) lt3022 v in C v out = 1v, v ripple = 0.5v p-p , f ripple = 120hz, i load = 1a 55 70 db lt3022-1.2 v in C v out = 1v, v ripple = 0.5v p-p , f ripple = 120hz, i load = 1a 51 66 db lt3022-1.5 v in C v out = 1v, v ripple = 0.5v p-p , f ripple = 120hz, i load = 1a 51 66 db lt3022-1.8 v in C v out = 1v, v ripple = 0.5v p-p , f ripple = 120hz, i load = 1a 51 66 db current limit (note 9) v in = 10v, v out = 0v v in = v out(nominal) + 0.5v, ?v out C5% l 1.1 2.6 1.7 a a input reverse leakage current (note 14) v in = C10v, v out = 0v 4 40 a reverse output current (notes 15, 16) lt3022 v out = 1.2v, v in = 0v lt3022-1.2 v out = 1.2v, v in = 0v lt3022-1.5 v out = 1.5v, v in = 0v lt3022-1.8 v out = 1.8v, v in = 0v 0.1 0.1 0.1 0.1 5 5 5 5 a a a a minimum required output current v in = 1.6v, v out = 1.2v l 1 ma electrical characteristics the l denotes the specifcations which apply over the full operating temperature range, otherwise specifcations are at t a = 25c.
lt3022/lt3022-1.2 lt3022-1.5/lt3022-1.8 6 3022fb typical performance characteristics minimum input voltage adj pin voltage dropout voltage guaranteed dropout voltage dropout voltage output current (ma) 0 dropout voltage (mv) 180 240 300 800 3022 g01 120 60 150 210 270 90 30 0 200100 400300 600 700 900 500 1000 t j = 125c v out = 1.2v t j = ?40c t j = 25c output current (ma) 0 guaranteed dropout voltage (mv) 180 240 300 800 3022 g02 120 60 150 210 270 90 30 0 200100 400300 600 700 900 500 1000 t j = 125c t j = 25c = test points temperature (c) ?50 0 dropout voltage (mv) 30 90 120 150 300 210 0 50 75 3022 g03 60 240 270 180 ?25 25 100 125 v out = 1.2v i l = 1a i l = 500ma i l = 100ma i l = 10ma temperature (c) ?50 minimum input voltage (v) 0.3 0.9 1.0 1.1 0 50 75 3022 g04 0.1 0.7 0.5 0.2 0.8 0 0.6 0.4 ?25 25 100 125 i l = 1a temperature (c) ?50 adj pin voltage (mv) 202 204 206 25 75 3022 g05 200 198 ?25 0 50 100 125 196 194 i l = 1ma temperature (c) ?50 output voltage (v) 1.212 1.224 1.236 0 50 75 3022 g05a 1.176 1.188 1.200 1.164 ?25 25 100 125 i l = 1ma temperature (c) ?50 output voltage (v) 1.515 1.530 1.545 0 50 75 3022 g05b 1.470 1.485 1.500 1.455 ?25 25 100 125 i l = 1ma temperature (c) ?50 output voltage (v) 1.818 1.836 1.854 0 50 75 3022 g05c 1.764 1.782 1.800 1.746 ?25 25 100 125 i l = 1ma output voltage output voltage output voltage
lt3022/lt3022-1.2 lt3022-1.5/lt3022-1.8 7 3022fb typical performance characteristics quiescent current quiescent current gnd pin current gnd pin current gnd pin current adj pin bias current quiescent current quiescent current temperature (c) ?50 0 adj pin bias current (na) 10 30 40 50 100 70 0 50 75 3022 g06 20 80 90 60 ?25 25 100 125 temperature (c) ?50 0 quiescent current (a) 100 300 400 500 1000 700 0 50 75 3022 g07 200 800 900 600 ?25 25 100 125 v in = 6v v out = 1.2v i l = 0 v shdn = v in v shdn = 0v input voltage (v) 0 quiescent current (ma) 3.0 4.0 5.0 8 3022 g08 2.0 1.0 2.5 3.5 4.5 1.5 0.5 0 21 43 6 7 9 5 10 v shdn = v in v shdn = 0v v out = 1.2v i l = 0 t j = 25c input voltage (v) 0 quiescent current (ma) 3.0 4.0 5.0 8 3022 g09 2.0 1.0 2.5 3.5 4.5 1.5 0.5 0 21 43 6 7 9 5 10 v shdn = v in v shdn = 0v v out = 1.5v i l = 0 t j = 25c input voltage (v) 0 quiescent current (ma) 3.0 4.0 5.0 8 3022 g10 2.0 1.0 2.5 3.5 4.5 1.5 0.5 0 21 43 6 7 9 5 10 v shdn = v in v shdn = 0v v out = 1.8v i l = 0 t j = 25c input voltage (v) 0 gnd pin current (ma) 24 21 18 15 12 9 6 3 0 8 3022 g11 2 4 6 10 7 1 3 5 9 r l = 1.2 i l = 1a r l = 2.4 i l = 500ma r l = 120 i l = 10ma r l = 12 i l = 100ma r l = 1.2k i l = 1ma v out = 1.2v t j = 25c input voltage (v) 0 gnd pin current (ma) 24 21 18 15 12 9 6 3 0 8 3022 g12 2 4 6 10 7 1 3 5 9 r l = 1.5 i l = 1a r l = 3 i l = 500ma r l = 150 i l = 10ma r l = 15 i l = 100ma v out = 1.5v t j = 25c r l = 1.5k i l = 1ma input voltage (v) 0 gnd pin current (ma) 24 21 18 15 12 9 6 3 0 8 3022 g13 2 4 6 10 7 1 3 5 9 r l = 1.8 i l = 1a r l = 3.6 i l = 500ma r l = 18 i l = 100ma v out = 1.8v t j = 25c r l = 180 i l = 10ma r l = 1.8k i l = 1ma
lt3022/lt3022-1.2 lt3022-1.5/lt3022-1.8 8 3022fb typical performance characteristics shdn pin input current current limit reverse input leakage current reverse input leakage current reverse output current input ripple rejection gnd pin current vs i load shdn pin threshold shdn pin input current load current (ma) 0 gnd pin current (ma) 24 21 18 15 12 9 6 3 0 800 3022 g14 200 400 600 1000 700 100 300 500 900 v in = 1.6v v out = 1.2v v shdn = 10v t j = 25c temperature (c) ?50 0 shdn pin threshold (v) 0.1 0.3 0.4 0.5 1.0 0.7 0 50 75 3022 g15 0.2 0.8 0.9 0.6 ?25 25 100 125 i l = 1ma shdn pin voltage (v) 0 shdn pin input current (a) 3.0 4.0 5.0 8 3022 g16 2.0 1.0 2.5 3.5 4.5 1.5 0.5 0 21 43 6 7 9 5 10 t j = 25c temperature (c) ?50 shdn pin input current (a) 4 5 6 25 75 3022 g17 3 2 ?25 0 50 100 125 1 0 v in = 10v v shdn = 10v temperature (c) ?50 0 current limit (a) 0.3 0.9 1.2 1.5 3.0 2.1 0 50 75 3022 g18 0.6 2.4 2.7 1.8 ?25 25 100 125 v out = 0v v in = 10v v in = 1.7v input voltage (v) 0 input current (a) ?8 ?4 0 ?8 3022 g19 ?12 ?16 ?10 ?6 ?2 ?14 ?18 ?20 ?2?1 ?4?3 ?6 ?7 ?9 ?5 ?10 v out = 0v v shdn = 10v t j = 25c temperature (c) ?50 ?20 input current (a) ?18 ?14 ?12 ?10 0 ?6 0 50 75 3022 g20 ?16 ?4 ?2 ?8 ?25 25 100 125 v in = ?10v v out = 0v v shdn = 10v temperature (c) ?50 reverse output current (a) 80 100 120 25 75 3022 g21 60 40 ?25 0 50 100 125 20 0 v in = 0v v out = 1.2v i out flows into out pin i in flows out of in pin i out i in frequency (hz) 10 100 40 input ripple rejection (db) 50 60 70 80 1k 10k 100k 1m 10m 3022 g22 30 20 10 0 90 100 c out = 47f c out = 10f v in = 1.5v + 50mv rms ripple v out = 0.5v i l = 1a t j = 25c
lt3022/lt3022-1.2 lt3022-1.5/lt3022-1.8 9 3022fb typical performance characteristics no-load recovery threshold no-load recovery threshold output noise spectral density rms output noise vs load current (10hz to 100khz) start-up from shutdown transient response input ripple rejection line regulation load regulation temperature (c) ?50 0 input ripple rejection (db) 10 30 40 50 100 70 0 50 75 3022 g23 20 80 90 60 ?25 25 100 125 v in = 1.5v + 0.5v p-p ripple at 120hz v out = 0.5v c out = 10f i l = 1a temperature (c) ?50 ?1.5 line regulation (mv) ?1.3 ?0.9 ?0.7 ?0.5 0.5 ?0.1 0 50 75 3022 g24 ?1.1 0.1 0.3 ?0.3 ?25 25 100 125 ?v in = 1.15v to 10v v out = 0.2v i l = 1ma temperature (c) ?50 ?1.0 load regulation (mv) ?0.8 ?0.4 ?0.2 0 1.0 0.4 0 50 75 3022 g25 ?0.6 0.6 0.8 0.2 ?25 25 100 125 v in = 1.15v v out = 0.5v ?i l = 1ma to 1a load regulation number refers to change in the 200mv reference voltage output overshoot (%) 0 0 output sink current (ma) 5 10 15 20 25 30 t j = 25c 5 10 15 20 3022 g26 temperature (c) ?50 output overshoot (%) 8 10 12 25 75 3022 g27 6 4 ?25 0 50 100 125 2 0 i out(sink) = 5ma i out(sink) = 1ma frequency (hz) 0.1 output noise spectral density (v/ hz) 1 10 1k 10k 1m 100k 3022 g28 0.001 0.01 100 10 v out = 1.2v i l = 1a t j = 25c c out = 47f c out = 10f load current (ma) 0.01 80 output noise (v rms ) 100 120 140 160 0.1 1 10 100 1000 3022 g29 60 40 20 0 180 200 v out = 1.2v c out = 10f t j = 25c v out 0.5v/div 50s/div 3022 g30 r l = 1.2 v in = 1.5v v out = 1.2v c out = 10f v shdn 1v/div v out 50mv/div 50s/div 3022 g31 v in = 1.5v v out = 1.2v i out = 100ma to 1a c out = 22f t rise = t fall = 100ns i out 500ma/div
lt3022/lt3022-1.2 lt3022-1.5/lt3022-1.8 10 3022fb pin functions nc (pins 1, 2, 8, 15, 16): no connect pins. these pins have no connection to internal circuitry. these pins may be foated, tied to v in or tied to gnd for improved thermal performance. out (pins 3, 4): these pins supply power to the load. use a minimum output capacitor of 10f 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. the lt3022 requires a 1ma minimum load current to ensure proper regulation and stability. sense (pin 5, fixed voltage device only): this pin is the sense point for the internal resistor divider. it should be tied directly to the out pins for best results. adj (pin 5): this pin is the error amplifer inverting terminal. its 30na typical input bias current fows out of the pin (see curve of adj pin bias current vs temperature in the typical performance characteristics). the adj pin reference voltage is 200mv (referred to agnd). agnd (pins 6, 7): analog ground. tie these pins directly to pgnd (pins 10, 11) and the exposed backside gnd (pin 17). connect the bottom of the external resistor divider, setting output voltage, directly to agnd for optimum regulation. shdn (pin 9): pulling the shdn pin low puts the lt3022 into a low power state and turns the output off. drive the shdn pin with either logic or an open-collector/drain device with a pull-up resistor. the resistor supplies the pull-up current to the open collector/drain logic, normally several microamperes, and the shdn pin current, typically 3a. if unused, connect the shdn pin to v in . the lt3022 does not function if the shdn pin is not connected. pgnd (pins 10, 11): power ground. the majority of ground pin current fows out of pgnd. tie these pins directly to agnd (pins 6, 7) and the exposed backside gnd (pin 17). in (pins 12, 13,14): these pins supply power to the device. the lt3022 requires a bypass capacitor at in if located more than six inches from the main input flter capacitor. include a bypass capacitor in battery-powered circuits as a batterys output impedance rises with frequency. a minimum bypass capacitor of 10f suffces. the lt3022 withstands reverse voltages on the in pin with respect to ground and the out pin. in the case of a reversed input, which occurs if a battery is plugged in backwards, the lt3022 behaves as if a diode is in series with its input. no reverse current fows into the lt3022 and no reverse voltage appears at the load. the device protects itself and the load. gnd (pin 17): exposed pad. tie this pin directly to agnd (pins 6, 7), pgnd (pins 10, 11) and the pcb ground. this pin provides enhanced thermal performance with its connection to the pcb ground. see the applications information section for thermal considerations and calculating junction temperature.
lt3022/lt3022-1.2 lt3022-1.5/lt3022-1.8 11 3022fb block diagram ? + ? + 9 error amp no-load recovery 200mv bias current and reference generator 213mv ideal diode thermal shutdown shutdown shdn current gain r3 r2 r1 in 12, 13, 14 3, 4 d1 q1 q3 q2 d2 25k pgnd 10, 11 out 6, 7 agnd 3022 bd adj 5 5 sense fixed v out 1.2v 1.5v 1.8v r1 3.92k 3.92k 3.92k r2 19.6k 25.5k 31.4k note: for lt3022 adj pin (5) is connected to the adj pin, r1 and r2 are external. for lt3022-1.x pin (5) is connected to the sense pin, r1 and r2 are internal. tie pgnd, agnd and the exposed pad together.
lt3022/lt3022-1.2 lt3022-1.5/lt3022-1.8 12 3022fb applications information the lt3022 very low dropout linear regulator is capable of 0.9v input supply operation. it supplies 1a output current and dropout voltage is typically 145mv. quiescent current is typically 400a and drops to 7.5a in shutdown. the lt3022 incorporates several protection features, making it ideal for use in battery-powered systems. the device protects itself against reverse-input and reverse-output voltages. if the output is held up by a backup battery when the input is pulled to ground in a battery backup application, the lt3022 behaves as if a diode is in series with its output, preventing reverse current fow. in dual supply applications where the regulator load is returned to a negative supply, pulling the output below ground by as much as 10v does not affect start-up or normal operation. adjustable operation the lt3022s output voltage range is 0.2v to 9.5v. figure 1 shows that the external resistor ratio sets output voltage. the device regulates the output to maintain adj at 200mv referred to ground. r1s current equals 200mv/r1. r2s current is r1s current minus the adj pin bias current. the 30na adj pin bias current fows out of the pin. use figure 1s formula to calculate output voltage. given the lt3022s 1ma minimum load current requirement, linear technology recommends choosing resistor divider values to satisfy this requirement. a 200 r1 value sets a 1ma resistor divider current. in shutdown, the output is 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 section. specifcations for output voltages greater than 200mv are proportional to the ratio of desired output voltage to 200mv (v out /200mv). for example, load regulation for an output current change of 1ma to 1a is typically 100v at v adj = 200mv. at v out = 1.5v, load regulation is: 15 200 100 750 . ? v mv v v = table 1 shows 1% resistor divider values for some common output voltages with a resistor divider current equaling or about 1ma. table 1 v out (v) r1 () r2 () 0.9 200 698 1.0 187 750 1.2 200 1000 1.5 200 1300 1.8 187 1500 2.5 187 2150 3.3 200 3090 in v out : 200mv ? (1 + r2/r1) C (i adj ? r2) v adj : 200mv i adj : 30na at 25c output range: 0.2v to 9.5v v in v out lt3022 shdn r2 r1 out adj gnd 3022 f01 + figure 1. adjustable operation output capacitance and transient response the lt3022s design is stable with a wide range of output capacitors, but is optimized for low esr ceramic capacitors. the output capacitors esr affects stability, most notably with small value capacitors. use a minimum output capacitor of 10f with an esr of less than 0.1 to prevent oscillations. the lt3022 is a low voltage 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 large load current changes. ceramic capacitors require extra consideration. manufac - turers make ceramic capacitors with a variety of dielectrics; each with a different behavior across temperature and applied voltage. the most common dielectrics are z5u, y5v, x5r and x7r. z5u and y5v dielectrics provide high c-v products in a small package at low cost, but exhibit strong voltage and temperature coeffcients. x5r and x7r dielectrics yield highly stable characteristics
lt3022/lt3022-1.2 lt3022-1.5/lt3022-1.8 13 3022fb applications information dc bias voltage (v) change in value (%) 3022 f02 20 0 ?20 ?40 ?60 ?80 ?100 0 4 8 10 2 6 12 14 x5r y5v 16 both capacitors are 16v, 1210 case size, 10f temperature (c) ?50 40 20 0 ?20 ?40 ?60 ?80 ?100 25 75 3022 f03 ?25 0 50 100 125 y5v change in value (%) x5r both capacitors are 16v, 1210 case size, 10f figure 3. ceramic capacitor temperature characteristics figure 2. ceramic capacitor dc bias characteristics and are more suitable for use as the output capacitor at fractionally increased cost. x5r and x7r dielectrics both exhibit excellent voltage coeffcient characteristics. x7r works over a larger temperature range and exhibits better temperature stability whereas x5r is less expensive and is available in higher values. figures 2 and 3 show voltage coeffcient and temperature coeffcient comparisons between y5v and x5r material. voltage and temperature coeffcients 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 microphone 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. 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. 1mv/div 1ms/div 3022 f04 v out = 1.3v c out = 10f i load = 0 figure 4. noise resulting from tapping on a ceramic capacitor no-load/light-load recovery a possible transient load step that occurs is where the output current changes from its maximum level to zero current or a very small load current. the output voltage responds by overshooting until the regulator lowers the amount of current it delivers to the new level. the regulator loop response time and the amount of output capacitance control the amount of overshoot. once the regulator has decreased its output current, the current provided by the resistor divider (which sets v out ) is the only current remaining to discharge the output capacitor from the level to which it overshot. the amount of time it takes for the output voltage to recover easily extends to milliseconds with minimum divider current and many microfarads of output capacitance.
lt3022/lt3022-1.2 lt3022-1.5/lt3022-1.8 14 3022fb applications information to eliminate this problem, the lt3022 incorporates a no-load or light load recovery circuit. this circuit is a voltage-controlled current sink that signifcantly improves the light load transient response time by discharging the output capacitor quickly and then turning off. the current sink turns on when the output voltage exceeds 6.5% of the nominal output voltage. the current sink level is then proportional to the overdrive above the threshold up to a maximum of about 24ma. consult the curve in the typical performance characteristics for the no-load recovery threshold. if external circuitry forces the output above the no-load recovery circuits threshold, the current sink turns on in an attempt to restore the output voltage to nominal. the current sink remains on until the external circuitry releases the output. however, if the external circuitry pulls the output voltage above the input voltage or the input falls below the output, the lt3022 turns the current sink off and shuts down the bias current/reference generator circuitry. thermal considerations the lt3022s maximum rated junction temperature of 125c limits its power handling capability. two components comprise the power dissipation of the device: 1. output current multiplied by the input-to-output voltage differential: (i load ) ? (v in C v out ) and 2. gnd pin current multiplied by the input voltage: (i gnd ) ? (v in ) gnd pin current is found by examining the gnd pin current curves in the typical performance characteristics. power dissipation equals the sum of the two components listed. the lt3022s internal thermal limiting (with hysteresis) protects the device during overload conditions. for normal continuous conditions, do not exceed the maximum junction temperature rating of 125c. carefully consider all sources of thermal resistance from junction to ambient including other heat sources mounted in proximity to the lt3022. the underside of the lt3022 dhc and mse packages has exposed metal from the lead frame to the die attachment. heat transfers directly from the die junction to the printed circuit board metal, allowing maximum junction temperature control. the dual-in-line pin arrangement allows metal to extend beyond the ends of the package on the topside (component side) of a pcb. connect this metal to gnd on the pcb. the multiple in and out pins of the lt3022 also assist in spreading heat to the pcb. copper board stiffeners and plated throughholes can also be used to spread the heat generated by power devices. the following tables list thermal resistance as a function of copper area in a fxed board size. all measurements are taken in still air on a 4-layer fr-4 board with 1oz solid internal planes, and 2oz external trace planes with a total board thickness of 1.6mm. for more information on thermal resistance and high thermal conductivity test boards, refer to jedec standard jesd51, notably jesd51-12 and jesd51-7. achieving low thermal resistance necessitates attention to detail and careful pcb layout. table 2. measured thermal resistance for dhc package copper area board area thermal resistance (junction-to-ambient) topside* backside 2500mm 2 2500mm 2 2500mm 2 35c/w 1000mm 2 2500mm 2 2500mm 2 37c/w 225mm 2 2500mm 2 2500mm 2 38c/w 100mm 2 2500mm 2 2500mm 2 40c/w *device is mounted on topside table 3. measured thermal resistance for mse package copper area board area thermal resistance (junction-to-ambient) topside* backside 2500mm 2 2500mm 2 2500mm 2 35c/w 1000mm 2 2500mm 2 2500mm 2 37c/w 225mm 2 2500mm 2 2500mm 2 38c/w 100mm 2 2500mm 2 2500mm 2 40c/w *device is mounted on topside.
lt3022/lt3022-1.2 lt3022-1.5/lt3022-1.8 15 3022fb applications information calculating junction temperature example: given an output voltage of 1.5v, an input voltage range of 1.7v to 1.9v, an output load current range of 1ma to 1a and a maximum ambient temperature of 85c, what is the maximum junction temperature for an application using the dhc package? the power dissipated by the device equals: i load(max) ? (v in(max ) C v out ) + i gnd ? (v in(max) ) where: i load(max) = 1a v in(max) = 1.9v i gnd at (i load = 1a, v in = 1.9v) = 18ma so: p = 1a ? (1.9v C 1.5v) + 18ma ? (1.9v) = 0.434w the thermal resistance is about 38c/w depending on the copper area. so the junction temperature rise above ambient is approximately equal to: 0.434w ? (38c/w) = 16.5c the maximum junction temperature equals the maximum junction temperature rise above ambient plus the maximum ambient temperature or: t jmax = 85c + 16.5c = 101.5c protection features the lt3022 incorporates several protection features that make it ideal for use in battery-powered circuits. in addition 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 its output. for normal operation, do not exceed 125c junction temperature. the typical thermal shutdown temperature is 165c and the thermal shutdown circuit incorporates about 7c of hysteresis. the in pins withstand reverse voltages of 10v. the lt3022 limits current fow to less than 1a and no negative voltage appears at out . the device protects both itself and the load against batteries that are plugged in backwards. the lt3022 incurs no damage if out is pulled below ground. if in is left open-circuited or grounded, out can be pulled below ground by 10v. no current fows from the pass transistor connected to out. however, current fows in (but is limited by) the resistor divider that sets the output voltage. current fows 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 lt3022 protects itself by thermal limiting. in this case, grounding shdn turns off the lt3022 and stops out from sourcing current. the lt3022 incurs no damage if the adj pin is pulled above or below ground by 10v. if in is left open-circuited or grounded and adj is pulled above ground, adj acts like a 25k resistor in series with two diodes. adj acts like a 25k resistor if pulled below ground. if in is powered by a voltage source and adj is pulled below its reference voltage, the lt3022 attempts to source its current limit capability at out. the output voltage increases to v in C v dropout with v dropout set by whatever load current the lt3022 supports. this condition can potentially damage external circuitry powered by the lt3022 if the output voltage increases to an unregulated high voltage. if in is powered by a voltage source and adj is pulled above its reference voltage, two situations can occur. if adj is pulled slightly above its reference voltage, the lt3022 turns off the pass transistor, no output current is sourced and the output voltage decreases to either the voltage at adj or less. if adj is pulled above its no-load recovery threshold, the no-load recovery circuitry turns on and attempts to sink current. out is actively pulled low and the output voltage clamps at a schottky diode above ground. please note that the behavior described above applies to the lt3022 only. if a resistor divider is connected under the same conditions, there will be additional v/r current.
lt3022/lt3022-1.2 lt3022-1.5/lt3022-1.8 16 3022fb applications information 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. in the case where the input is grounded, there is less than 1a of reverse output current. if the lt3022 in pin is forced below the out pin or the out pin is pulled above the in pin, input current drops to less than 10a typically. this occurs if the lt3022 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 on the reverse output current if out is pulled above in. input capacitance and stability the lt3022 design is stable with a minimum of 10f capacitor placed at the in pin. very low esr ceramic capacitors may be used. however, in cases where long wires connect the power supply to the lt3022s input and ground, use of low value input capacitors combined with an output load current of greater than 20ma may result in instability. the resonant lc tank circuit formed by the wire inductance and the input capacitor is the cause and not a result of lt3022 instability. the self-inductance, or isolated inductance, of a wire is directly proportional to its length. however, the wire diameter has less infuence on its self inductance. for example, the self-inductance of a 2-awg isolated wire with a diameter of 0.26" is about half the inductance of a 30-awg wire with a diameter of 0.01". one foot of 30-awg wire has 465nh of self-inductance. several methods exist to reduce a wires self-inductance. one method divides the current fowing towards the lt3022 between two parallel conductors. in this case, placing the wires further apart reduces the inductance; up to a 50% reduction when placed only a few inches apart. splitting the wires connects two equal inductors in parallel. however, when placed in close proximity to each other, mutual inductance adds to the overall self inductance of the wires. the most effective technique to reducing overall inductance is to place the forward and return current conductors (the input wire and the ground wire) in close proximity. two 30-awg wires separated by 0.02" reduce the overall self-inductance to about one-ffth of a single wire. if a battery, mounted in close proximity, powers the lt3022, a 10f input capacitor suffces for stability. however, if a distantly located supply powers the lt3022, use a larger value input capacitor. use a rough guideline of 1f (in addition to the 10f minimum) per 8 inches of wire length. the minimum input capacitance needed to stabilize the application also varies with power supply output impedance variations. placing additional capacitance on the lt3022s output also helps. however, this requires an order of magnitude more capacitance in comparison with additional lt3022 input bypassing. series resistance between the supply and the lt3022 input also helps stabilize the application; as little as 0.1 to 0.5 suffces. this impedance dampens the lc tank circuit at the expense of dropout voltage. a better alternative is to use higher esr tantalum or electrolytic capacitors at the lt3022 input in place of ceramic capacitors.
lt3022/lt3022-1.2 lt3022-1.5/lt3022-1.8 17 3022fb package description dhc package 16-lead plastic dfn (5mm 3mm) (reference ltc dwg # 05-08-1706) 3.00 0.10 (2 sides) 5.00 0.10 (2 sides) note: 1. drawing proposed to be made variation of version (wjed-1) in jedec package outline mo-229 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 view?exposed pad 1.65 0.10 (2 sides) 0.75 0.05 r = 0.115 typ r = 0.20 typ 4.40 0.10 (2 sides) 1 8 16 9 pin 1 top mark (see note 6) 0.200 ref 0.00 ? 0.05 (dhc16) dfn 1103 0.25 0.05 pin 1 notch 0.50 bsc 4.40 0.05 (2 sides) recommended solder pad pitch and dimensions 1.65 0.05 (2 sides) 2.20 0.05 0.50 bsc 0.65 0.05 3.50 0.05 package outline 0.25 0.05
lt3022/lt3022-1.2 lt3022-1.5/lt3022-1.8 18 3022fb package description msop (mse16) 0911 rev e 0.53 0.152 (.021 .006) seating plane 0.18 (.007) 1.10 (.043) max 0.17 ?0.27 (.007 ? .011) typ 0.86 (.034) ref 0.50 (.0197) bsc 16 16151413121110 1 2 3 4 5 6 7 8 9 9 1 8 note: 1. dimensions in millimeter/(inch) 2. drawing not to scale 3. dimension does not include mold flash, protrusions or gate burrs. mold flash, protrusions or gate burrs shall not exceed 0.152mm (.006") per side 4. dimension does not include interlead flash or protrusions. interlead flash or protrusions shall not exceed 0.152mm (.006") per side 5. lead coplanarity (bottom of leads after forming) shall be 0.102mm (.004") max 6. exposed pad dimension does include mold flash. mold flash on e-pad shall not exceed 0.254mm (.010") per side. 0.254 (.010) 0 ? 6 typ detail ?a? detail ?a? gauge plane 5.23 (.206) min 3.20 ? 3.45 (.126 ? .136) 0.889 0.127 (.035 .005) recommended solder pad layout 0.305 0.038 (.0120 .0015) typ 0.50 (.0197) bsc bottom view of exposed pad option 2.845 0.102 (.112 .004) 2.845 0.102 (.112 .004) 4.039 0.102 (.159 .004) (note 3) 1.651 0.102 (.065 .004) 1.651 0.102 (.065 .004) 0.1016 0.0508 (.004 .002) 3.00 0.102 (.118 .004) (note 4) 0.280 0.076 (.011 .003) ref 4.90 0.152 (.193 .006) detail ?b? detail ?b? corner tail is part of the leadframe feature. for reference only no measurement purpose 0.12 ref 0.35 ref mse package 16-lead plastic msop, exposed die pad (reference ltc dwg # 05-08-1667 rev e)
lt3022/lt3022-1.2 lt3022-1.5/lt3022-1.8 19 3022fb 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 a 9/10 added -1.2, -1.5, and -1.8 fxed voltage options 1 to 6, 10, 20 b 02/12 revised max value for input reverse leakage current updated the 16-lead mse package 5 18
lt3022/lt3022-1.2 lt3022-1.5/lt3022-1.8 20 3022fb linear technology corporation 1630 mccarthy blvd., milpitas, ca 95035-7417 (408) 432-1900 fax : (408) 434-0507 www.linear.com linear technology corporation 2010 lt 0212 rev b ? printed in usa related parts part number description comments lt3020 100ma, low voltage vldo linear regulator v in : 0.9v to 10v, v out : 0.2v to 9.5v, v do = 0.15v, i q = 120a, noise: <250v rms , stable with 2.2f ceramic capacitors, dfn-8, ms8 packages lt3021 500ma, low voltage, vldo linear regulator v in : 0.9v to 10v, dropout voltage: 160mv typical, adjustable output (v ref = v out(min) = 200mv), fixed output voltages: 1.2v, 1.5v, 1.8v, stable with low esr, ceramic output capacitors, 16-pin dfn (5mm w 5mm) and 8-lead so packages lt c ? 3025 300ma micropower vldo linear regulator v in = 0.9v to 5.5v, dropout voltage: 45mv, low noise 80v rms , low i q : 54a, 2mm w 2mm 6-lead dfn package ltc3025-1/ltc3025-2/ ltc3025-3/ltc3025-4 500ma micropower vldo linear regulator in 2mm w 2mm dfn v in = 0.9v to 5.5v, dropout voltage: 75mv, low noise 80v rms , low i q : 54a, fixed output: 1.2v (ltc3025-2), 1.5v (ltc3025-3), 1.8v (ltc3025-4); adjustable output range: 0.4v to 3.6v (ltc3025-1), 2mm w 2mm 6-lead dfn package ltc3026 1.5a, low input voltage vldo linear regulator v in : 1.14v to 3.5v (boost enabled), 1.14v to 5.5v (with external 5v), v do = 0.1v, i q = 950a, stable with 10f ceramic capacitors, 10-lead emsop and dfn-10 packages lt3029 dual 500ma/500ma, low dropout, low noise, micropower linear regulator output current: 500ma per channel, low dropout voltage: 300mv low noise: 20v rms (10hz to 100khz), low quiescent current: 55a per channel, wide input voltage range: 1.8v to 20v (common or independent input supply), adjustable output: 1.215v reference, very low quiescent current in shutdown: <1a per channel stable with 3.3f minimum output capacitor, stable with ceramic, tantalum or aluminum electrolytic capacitors, reverse- battery, and reverse output-to-input protection, thermally enhanced 16-lead emsop and 16-lead (4mm w 3mm) dfn packages ltc3035 300ma vldo linear regulator with charge pump bias generator v in = 1.7v to 5.5v, v out : 0.4v to 3.6v, dropout voltage: 45mv , i q : 100a, 3mm w 2mm dfn-8 LT3080/LT3080-1 1.1a, parallelable, low noise, low dropout linear regulator 300mv dropout voltage (2-supply operation), low noise: 40v rms , v in : 1.2v to 36v, v out : 0v to 35.7v, current-based reference with 1-resistor v out set; directly parallelable (no op amp required), stable with ceramic capacitors, to-220, sot-223, emsop-8 and 3mm w 3mm dfn-8 packages; LT3080-1 has integrated internal ballast resistor lt3085 500ma, parallelable, low noise, low dropout linear regulator 275mv dropout voltage (2-supply operation), low noise: 40v rms , v in : 1.2v to 36v, v out : 0v to 35.7v, current-based reference with 1-resistor v out set; directly parallelable (no op amp required), stable with ceramic capacitors, emsop-8 and 2mm w 3mm dfn-6 packages typical application 1.5v to 1.2v, 1a vldo regulator in 10f v in 1.5v v out 1.2v 1a lt3022-1.2 shdn out sense gnd 10f r ld 1.2k* 3022 ta02 *r ld : optional (to satisfy 1ma minimum load current requirement)

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