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| lt1790 1 1790fb typical application description micropower sot-23 low dropout reference family features applications l , lt, ltc, ltm, linear technology and the linear logo are registered trademarks of linear technology corporation. thinsot is a trademark of linear technology corporation. all other trademarks are the property of their respective owners. the lt ? 1790 is a family of sot-23 micropower low dropout series references that combine high accuracy and low drift with low power dissipation and small package size. these micropower references use curvature compensation to obtain a low temperature coef? cient and trimmed preci- sion thin-? lm resistors to achieve high output accuracy. in addition, each lt1790 is post-package trimmed to greatly reduce the temperature coef? cient and increase the output accuracy. output accuracy is further assured by excellent line and load regulation. special care has been taken to minimize thermally induced hysteresis. the lt1790s are ideally suited for battery-operated sys- tems because of their small size, low supply current and reduced dropout voltage. these references provide sup- ply current and power dissipation advantages over shunt references that must idle the entire load current to operate. since the lt1790 can also sink current, it can operate as a micropower negative voltage reference with the same performance as a positive reference. n high accuracy: a grade0.05% max b grade0.1% max n low drift: a grade10ppm/c max b grade25ppm/c max n low thermal hysteresis 40ppm (typical) C40c to 85c n low supply current: 60a max n sinks and sources current n low dropout voltage n guaranteed operational C40c to 125c n wide supply range to 18v n available output voltage options: 1.25v, 2.048v, 2.5v, 3v, 3.3v, 4.096v and 5v n low pro? le (1mm) thinsot? package n handheld instruments n negative voltage references n industrial control systems n data acquisition systems n battery-operated equipment typical v out distribution for lt1790-2.5 positive connection for lt1790-2.5 0.1f 2.6v v in 18v 1f 1, 2 6 v out = 2.5v 4 lt1790-2.5 1790 ta01 output voltage (v) 2.498 2.499 2.500 2.501 2.502 number of units 30 40 50 1790 ta02 20 10 25 35 45 15 5 0 lt1790b limits lt1790a limits 167 units
lt1790 2 1790fb pin configuration absolute maximum ratings (note 1) order information lead free finish tape and reel part marking* package description specified temperature range lt1790acs6-1.25#pbf lt1790acs6-1.25#trpbf ltxt 6-lead plastic tsot-23 0c to 70c lt1790ais6-1.25#pbf lt1790ais6-1.25#trpbf ltxt 6-lead plastic tsot-23 C40c to 85c lt1790bcs6-1.25#pbf lt1790bcs6-1.25#trpbf ltxt 6-lead plastic tsot-23 0c to 70c lt1790bis6-1.25#pbf lt1790bis6-1.25#trpbf ltxt 6-lead plastic tsot-23 C40c to 85c lt1790acs6-2.048#pbf lt1790acs6-2.048#trpbf ltxu 6-lead plastic tsot-23 0c to 70c lt1790ais6-2.048#pbf lt1790ais6-2.048#trpbf ltxu 6-lead plastic tsot-23 C40c to 85c lt1790bcs6-2.048#pbf lt1790bcs6-2.048#trpbf ltxu 6-lead plastic tsot-23 0c to 70c lt1790bis6-2.048#pbf lt1790bis6-2.048#trpbf ltxu 6-lead plastic tsot-23 C40c to 85c lt1790acs6-2.5#pbf lt1790acs6-2.5#trpbf ltpz 6-lead plastic tsot-23 0c to 70c lt1790ais6-2.5#pbf lt1790ais6-2.5#trpbf ltpz 6-lead plastic tsot-23 C40c to 85c lt1790bcs6-2.5#pbf lt1790bcs6-2.5#trpbf ltpz 6-lead plastic tsot-23 0c to 70c lt1790bis6-2.5#pbf lt1790bis6-2.5#trpbf ltpz 6-lead plastic tsot-23 C40c to 85c lt1790acs6-3#pbf lt1790acs6-3#trpbf ltqa 6-lead plastic tsot-23 0c to 70c lt1790ais6-3#pbf lt1790ais6-3#trpbf ltqa 6-lead plastic tsot-23 C40c to 85c lt1790bcs6-3#pbf lt1790bcs6-3#trpbf ltqa 6-lead plastic tsot-23 0c to 70c lt1790bis6-3#pbf lt1790bis6-3#trpbf ltqa 6-lead plastic tsot-23 C40c to 85c lt1790acs6-3.3#pbf lt1790acs6-3.3#trpbf ltxw 6-lead plastic tsot-23 0c to 70c lt1790ais6-3.3#pbf lt1790ais6-3.3#trpbf ltxw 6-lead plastic tsot-23 C40c to 85c lt1790bcs6-3.3#pbf lt1790bcs6-3.3#trpbf ltxw 6-lead plastic tsot-23 0c to 70c lt1790bis6-3.3#pbf lt1790bis6-3.3#trpbf ltxw 6-lead plastic tsot-23 C40c to 85c lt1790acs6-4.096#pbf lt1790acs6-4.096#trpbf ltqb 6-lead plastic tsot-23 0c to 70c lt1790ais6-4.096#pbf lt1790ais6-4.096#trpbf ltqb 6-lead plastic tsot-23 C40c to 85c lt1790bcs6-4.096#pbf lt1790bcs6-4.096#trpbf ltqb 6-lead plastic tsot-23 0c to 70c lt1790bis6-4.096#pbf lt1790bis6-4.096#trpbf ltqb 6-lead plastic tsot-23 C40c to 85c lt1790acs6-5#pbf lt1790acs6-5#trpbf ltqc 6-lead plastic tsot-23 0c to 70c lt1790ais6-5#pbf lt1790ais6-5#trpbf ltqc 6-lead plastic tsot-23 C40c to 85c lt1790bcs6-5#pbf lt1790bcs6-5#trpbf ltqc 6-lead plastic tsot-23 0c to 70c lt1790bis6-5#pbf lt1790bis6-5#trpbf ltqc 6-lead plastic tsot-23 C40c to 85c input voltage .............................................................20v speci? ed temperature range commercial............................................. 0c to 70c industrial .............................................C 40c to 85c output short-circuit duration .......................... inde? nite operating temperature range (note 2) ..................................................C40c to 125c storage temperature range (note 3) .................................................. C65c to 150c lead temperature (soldering, 10 sec) .................. 300c 1 2 3 6 5 4 top view s6 package 6-lead plastic tsot-23 t jmax = 150c, ja = 230c/w *dnc: do not connect v out dnc* v in gnd gnd dnc* lt1790 3 1790fb order information lead based finish tape and reel part marking* package description specified temperature range lt1790acs6-1.25 lt1790acs6-1.25#tr ltxt 6-lead plastic tsot-23 0c to 70c lt1790ais6-1.25 lt1790ais6-1.25#tr ltxt 6-lead plastic tsot-23 C40c to 85c lt1790bcs6-1.25 lt1790bcs6-1.25#tr ltxt 6-lead plastic tsot-23 0c to 70c lt1790bis6-1.25 lt1790bis6-1.25#tr ltxt 6-lead plastic tsot-23 C40c to 85c lt1790acs6-2.048 lt1790acs6-2.048#tr ltxu 6-lead plastic tsot-23 0c to 70c lt1790ais6-2.048 lt1790ais6-2.048#tr ltxu 6-lead plastic tsot-23 C40c to 85c lt1790bcs6-2.048 lt1790bcs6-2.048#tr ltxu 6-lead plastic tsot-23 0c to 70c lt1790bis6-2.048 lt1790bis6-2.048#tr ltxu 6-lead plastic tsot-23 C40c to 85c lt1790acs6-2.5 lt1790acs6-2.5#tr ltpz 6-lead plastic tsot-23 0c to 70c lt1790ais6-2.5 lt1790ais6-2.5#tr ltpz 6-lead plastic tsot-23 C40c to 85c lt1790bcs6-2.5 lt1790bcs6-2.5#tr ltpz 6-lead plastic tsot-23 0c to 70c lt1790bis6-2.5 lt1790bis6-2.5#tr ltpz 6-lead plastic tsot-23 C40c to 85c lt1790acs6-3 lt1790acs6-3#tr ltqa 6-lead plastic tsot-23 0c to 70c lt1790ais6-3 lt1790ais6-3#tr ltqa 6-lead plastic tsot-23 C40c to 85c lt1790bcs6-3 lt1790bcs6-3#tr ltqa 6-lead plastic tsot-23 0c to 70c lt1790bis6-3 lt1790bis6-3#tr ltqa 6-lead plastic tsot-23 C40c to 85c lt1790acs6-3.3 lt1790acs6-3.3#tr ltxw 6-lead plastic tsot-23 0c to 70c lt1790ais6-3.3 lt1790ais6-3.3#tr ltxw 6-lead plastic tsot-23 C40c to 85c lt1790bcs6-3.3 lt1790bcs6-3.3#tr ltxw 6-lead plastic tsot-23 0c to 70c lt1790bis6-3.3 lt1790bis6-3.3#tr ltxw 6-lead plastic tsot-23 C40c to 85c lt1790acs6-4.096 lt1790acs6-4.096#tr ltqb 6-lead plastic tsot-23 0c to 70c lt1790ais6-4.096 lt1790ais6-4.096#tr ltqb 6-lead plastic tsot-23 C40c to 85c lt1790bcs6-4.096 lt1790bcs6-4.096#tr ltqb 6-lead plastic tsot-23 0c to 70c lt1790bis6-4.096 lt1790bis6-4.096#tr ltqb 6-lead plastic tsot-23 C40c to 85c lt1790acs6-5 lt1790acs6-5#tr ltqc 6-lead plastic tsot-23 0c to 70c lt1790ais6-5 lt1790ais6-5#tr ltqc 6-lead plastic tsot-23 C40c to 85c lt1790bcs6-5 lt1790bcs6-5#tr ltqc 6-lead plastic tsot-23 0c to 70c lt1790bis6-5 lt1790bis6-5#tr ltqc 6-lead plastic tsot-23 C40c to 85c 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/ lt1790 4 1790fb available options output voltage initial accuracy temperature coefficient temperature range 0c to 70c C40c to 85c order part number order part number 1.250v 0.05% 0.1% 10ppm/c 25ppm/c lt1790acs6-1.25 lt1790bcs6-1.25 lt1790ais6-1.25 lt1790bis6-1.25 2.048v 0.05% 0.1% 10ppm/c 25ppm/c lt1790acs6-2.048 lt1790bcs6-2.048 lt1790ais6-2.048 lt1790bis6-2.048 2.500v 0.05% 0.1% 10ppm/c 25ppm/c lt1790acs6-2.5 lt1790bcs6-2.5 lt1790ais6-2.5 lt1790bis6-2.5 3.000v 0.05% 0.1% 10ppm/c 25ppm/c lt1790acs6-3 lt1790bcs6-3 lt1790ais6-3 lt1790bis6-3 3.300v 0.05% 0.1% 10ppm/c 25ppm/c lt1790acs6-3.3 lt1790bcs6-3.3 lt1790ais6-3.3 lt1790bis6-3.3 4.096v 0.05% 0.1% 10ppm/c 25ppm/c lt1790acs6-4.096 lt1790bcs6-4.096 lt1790ais6-4.096 lt1790bis6-4.096 5.000v 0.05% 0.1% 10ppm/c 25ppm/c lt1790acs6-5 lt1790bcs6-5 lt1790ais6-5 lt1790bis6-5 parameter conditions min typ max units output voltage (notes 3, 4) lt1790a 1.24937 C0.05 1.25 1.25062 0.05 v % lt1790b 1.24875 C0.1 1.25 1.25125 0.1 v % lt1790ac l l 1.24850 C0.12 1.25 1.2515 0.12 v % lt1790ai l l 1.24781 C0.175 1.25 1.25219 0.175 v % lt1790bc l l 1.24656 C0.275 1.25 1.25344 0.275 v % lt1790bi l l 1.24484 C0.4125 1.25 1.25516 0.4125 v % output voltage temperature coef? cient (note 5) t min t a t max lt1790a lt1790b l l 5 12 10 25 ppm/c ppm/c line regulation 2.6v v in 18v l 50 170 220 ppm/v ppm/v load regulation (note 6) i out source = 5ma, v in = 2.8v l 100 160 250 ppm/ma ppm/ma i out sink = 1ma, v in = 3.2v l 120 180 250 ppm/ma ppm/ma minimum operating voltage (note 7) v in , v out = 0.1% i out = 0ma i out source = 5ma i out sink = 1ma l l l 1.95 2.15 2.50 2.90 2.95 v v v v 1.25v electrical characteristics the l denotes the speci? cations which apply over the speci? ed temperature range, otherwise speci? cations are at t a = 25c. c l = 1f and v in = 2.6v, unless otherwise noted. lt1790 5 1790fb parameter conditions min typ max units supply current no load l 35 60 75 a a minimum operating current negative output (see figure 7) v out = C 1.25v, 0.1% 100 125 a turn-on time c load = 1f 250 s output noise (note 8) 0.1hz f 10hz 10hz f 1khz 10 14 v p-p v rms long-term drift of output voltage (note 9) 50 ppm/ khr hysteresis (note 10) t = 0c to 70c t = C40c to 85c l l 25 40 ppm ppm 1.25v electrical characteristics the l denotes the speci? cations which apply over the speci? ed temperature range, otherwise speci? cations are at t a = 25c. c l = 1f and v in = 2.6v, unless otherwise noted. 2.048v electrical characteristics the l denotes the speci? cations which apply over the speci? ed temperature range, otherwise speci? cations are at t a = 25c. c l = 1f and v in = 2.8v, unless otherwise noted. parameter conditions min typ max units output voltage (notes 3, 4) lt1790a 2.04697 C0.05 2.048 2.04902 0.05 v % lt1790b 2.04595 C0.1 2.048 2.05005 0.1 v % lt1790ac l l 2.04554 C0.12 2.048 2.05046 0.12 v % lt1790ai l l 2.04442 C0.175 2.048 2.05158 0.175 v % lt1790bc l l 2.04237 C0.275 2.048 2.05363 0.275 v % lt1790bi l l 2.03955 C0.4125 2.048 2.05645 0.4125 v % output voltage temperature coef? cient (note 5) t min t a t max lt1790a lt1790b l l 5 12 10 25 ppm/c ppm/c line regulation 2.8v v in 18v l 50 170 220 ppm/v ppm/v load regulation (note 6) i out source = 5ma l 120 200 280 ppm/ma ppm/ma i out sink = 3ma l 130 260 450 ppm/ma ppm/ma dropout voltage (note 7) v in C v out , v out = 0.1% i out = 0ma i out source = 5ma i out sink = 3ma l l l 50 100 500 750 450 mv mv mv mv supply current no load l 35 60 75 a a minimum operating current negative output (see figure 7) v out = C 2.048v, 0.1% 100 125 a turn-on time c load = 1f 350 s lt1790 6 1790fb 2.5v electrical characteristics the l denotes the speci? cations which apply over the speci? ed temperature range, otherwise speci? cations are at t a = 25c. c l = 1f and v in = 3v, unless otherwise noted. parameter conditions min typ max units output voltage (notes 3, 4) lt1790a 2.49875 C0.05 2.5 2.50125 0.05 v % lt1790b 2.4975 C0.1 2.5 2.5025 0.1 v % lt1790ac l l 2.4970 C0.12 2.5 2.5030 0.12 v % lt1790ai l l 2.49563 C0.175 2.5 2.50438 0.175 v % lt1790bc l l 2.49313 C0.275 2.5 2.50688 0.275 v % lt1790bi l l 2.48969 C0.4125 2.5 2.51031 0.4125 v % output voltage temperature coef? cient (note 5) t min t a t max lt1790a lt1790b l l 5 12 10 25 ppm/c ppm/c line regulation 3v v in 18v l 50 170 220 ppm/v ppm/v load regulation (note 6) i out source = 5ma l 80 160 250 ppm/ma ppm/ma i out sink = 3ma l 70 110 300 ppm/ma ppm/ma dropout voltage (note 7) v in C v out , v out = 0.1% i out = 0ma i out source = 5ma i out sink = 3ma l l l 50 100 120 450 250 mv mv mv mv supply current no load l 35 60 80 a a minimum operating current negative output (see figure 7) v out = C 2.5v, 0.1% 100 125 a turn-on time c load = 1f 700 s output noise (note 8) 0.1hz f 10hz 10hz f 1khz 32 48 v p-p v rms long-term drift of output voltage (note 9) 50 ppm/ khr hysteresis (note 10) t = 0c to 70c t = C40c to 85c l l 25 40 ppm ppm parameter conditions min typ max units output noise (note 8) 0.1hz f 10hz 10hz f 1khz 22 41 v p-p v rms long-term drift of output voltage (note 9) 50 ppm/ khr hysteresis (note 10) t = 0c to 70c t = C40c to 85c l l 25 40 ppm ppm 2.048v electrical characteristics the l denotes the speci? cations which apply over the speci? ed temperature range, otherwise speci? cations are at t a = 25c. c l = 1f and v in = 2.8v, unless otherwise noted. lt1790 7 1790fb 3v electrical characteristics the l denotes the speci? cations which apply over the speci? ed temperature range, otherwise speci? cations are at t a = 25c. c l = 1f and v in = 3.5v, unless otherwise noted. parameter conditions min typ max units output voltage (notes 3, 4) lt1790a 2.9985 C0.05 3 3.0015 0.05 v % lt1790b 2.9970 C0.10 3 3.0030 0.10 v % lt1790ac l l 2.99640 C0.12 3 3.00360 0.12 v % lt1790ai l l 2.99475 C0.175 3 3.00525 0.175 v % lt1790bc l l 2.99175 C0.275 3 3.00825 0.275 v % lt1790bi l l 2.98763 C0.4125 3 3.01238 0.4125 v % output voltage temperature coef? cient (note 5) t min t a t max lt1790a lt1790b l l 5 12 10 25 ppm/c ppm/c line regulation 3.5v v in 18v l 50 170 220 ppm/v ppm/v load regulation (note 6) i out source = 5ma l 80 160 250 ppm/ma ppm/ma i out sink = 3ma l 70 110 300 ppm/ma ppm/ma dropout voltage (note 7) v in C v out , v out = 0.1% i out = 0ma i out source = 5ma i out sink = 3ma l l l 50 100 120 450 250 mv mv mv mv supply current no load l 35 60 80 a a minimum operating current negative output (see figure 7) v out = C 3v, 0.1% 100 125 a turn-on time c load = 1f 700 s output noise (note 8) 0.1hz f 10hz 10hz f 1khz 50 56 v p-p v rms long-term drift of output voltage (note 9) 50 ppm/ khr hysteresis (note 10) t = 0c to 70c t = C40c to 85c l l 25 40 ppm ppm lt1790 8 1790fb 3.3v electrical characteristics the l denotes the speci? cations which apply over the speci? ed temperature range, otherwise speci? cations are at t a = 25c. c l = 1f and v in = 3.8v, unless otherwise noted. parameter conditions min typ max units output voltage (notes 3, 4) lt1790a 3.29835 C0.05 3.3 3.30165 0.05 v % lt1790b 3.2967 C0.10 3.3 3.3033 0.10 v % lt1790ac l l 3.29604 C0.120 3.3 3.30396 0.120 v % lt1790ai l l 3.29423 C0.175 3.3 3.30578 0.175 v % lt1790bc l l 3.29093 C0.275 3.3 3.30908 0.275 v % lt1790bi l l 3.28639 C0.4125 3.3 3.31361 0.4125 v % output voltage temperature coef? cient (note 5) t min t a t max lt1790a lt1790b l l 5 12 10 25 ppm/c ppm/c line regulation 3.8v v in 18v l 50 170 220 ppm/v ppm/v load regulation (note 6) i out source = 5ma l 80 160 250 ppm/ma ppm/ma i out sink = 3ma l 70 110 300 ppm/ma ppm/ma dropout voltage (note 7) v in C v out , v out = 0.1% i out = 0ma i out source = 5ma i out sink = 3ma l l l 50 100 120 450 250 mv mv mv mv supply current no load l 35 60 80 a a minimum operating current negative output (see figure 7) v out = C 3.3v, 0.1% 100 125 a turn-on time c load = 1f 700 s output noise (note 8) 0.1hz f 10hz 10hz f 1khz 50 67 v p-p v rms long-term drift of output voltage (note 9) 50 ppm/ khr hysteresis (note 10) t = 0c to 70c t = C40c to 85c l l 25 40 ppm ppm lt1790 9 1790fb 4.096v electrical characteristics the l denotes the speci? cations which apply over the speci? ed temperature range, otherwise speci? cations are at t a = 25c. c l = 1f and v in = 4.6v, unless otherwise noted. parameter conditions min typ max units output voltage (notes 3, 4) lt1790a 4.094 C0.05 4.096 4.098 0.05 v % lt1790b 4.092 C0.10 4.096 4.10 0.10 v % lt1790ac l l 4.09108 C0.120 4.096 4.10092 0.120 v % lt1790ai l l 4.08883 C0.175 4.096 4.10317 0.175 v % lt1790bc l l 4.08474 C0.275 4.096 4.10726 0.275 v % lt1790bi l l 4.07910 C0.4125 4.096 4.11290 0.4125 v % output voltage temperature coef? cient (note 5) t min t a t max lt1790a lt1790b l l 5 12 10 25 ppm/c ppm/c line regulation 4.6v v in 18v l 50 170 220 ppm/v ppm/v load regulation (note 6) i out source = 5ma l 80 160 250 ppm/ma ppm/ma i out sink = 3ma l 70 110 300 ppm/ma ppm/ma dropout voltage (note 7) v in C v out , v out = 0.1% i out = 0ma i out source = 5ma i out sink = 3ma l l l 50 100 120 450 250 mv mv mv mv supply current no load l 35 60 80 a a minimum operating current negative output (see figure 7) v out = C 4.096v, 0.1% 100 125 a turn-on time c load = 1f 700 s output noise (note 8) 0.1hz f 10hz 10hz f 1khz 60 89 v p-p v rms long-term drift of output voltage (note 9) 50 ppm/ khr hysteresis (note 10) t = 0c to 70c t = C40c to 85c l l 25 40 ppm ppm lt1790 10 1790fb 5v electrical characteristics the l denotes the speci? cations which apply over the speci? ed temperature range, otherwise speci? cations are at t a = 25c. c l = 1f and v in = 5.5v, unless otherwise noted. parameter conditions min typ max units output voltage (notes 3, 4) lt1790a 4.9975 C0.05 5 5.0025 0.05 v % lt1790b 4.995 C0.10 5 5.005 0.10 v % lt1790ac l l 4.99400 C0.120 5 5.00600 0.120 v % lt1790ai l l 4.99125 C0.175 5 5.00875 0.175 v % lt1790bc l l 4.98625 C0.275 5 5.01375 0.275 v % lt1790bi l l 4.97938 C0.4125 5 5.02063 0.4125 v % output voltage temperature coef? cient (note 5) t min t a t max lt1790a lt1790b l l 5 12 10 25 ppm/c ppm/c line regulation 5.5v v in 18v l 50 170 220 ppm/v ppm/v load regulation (note 6) i out source = 5ma l 80 160 250 ppm/ma ppm/ma i out sink = 3ma l 70 110 300 ppm/ma ppm/ma dropout voltage (note 7) v in C v out , v out = 0.1% i out = 0ma i out source = 5ma i out sink = 3ma l l l 50 100 120 450 250 mv mv mv mv supply current no load l 35 60 80 a a minimum operating current negative output (see figure 7) v out = C 5v, 0.1% 100 125 a turn-on time c load = 1f 700 s output noise (note 8) 0.1hz f 10hz 10hz f 1khz 80 118 v p-p v rms long-term drift of output voltage (note 9) 50 ppm/ khr hysteresis (note 10) t = 0c to 70c t = C40c to 85c l l 25 40 ppm ppm 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 lt1790 is guaranteed functional over the operating temperature range of C 40c to 125c. the lt1790-1.25 at 125c is typically less than 2% above the nominal voltage. the other voltage options are typically less than 0.25% above their nominal voltage. note 3: if the part is stored outside of the speci? ed temperature range, the output voltage may shift due to hysteresis. note 4: esd (electrostatic discharge) sensitive device. extensive use of esd protection devices are used internal to the lt1790, however, high electrostatic discharge can damage or degrade the device. use proper esd handling precautions. note 5: temperature coef? cient is measured by dividing the change in output voltage by the speci? ed temperature range. incremental slope is also measured at 25c. note 6: load regulation is measured on a pulse basis from no load to the speci? ed load current. output changes due to die temperature change must be taken into account separately. note 7: excludes load regulation errors. lt1790 11 1790fb 1.25v typical performance characteristics temperature (c) C50 1.247 output voltage (v) 1.248 1.249 1.250 1.251 C10 30 70 110 17091.25 g01 1.252 1.253 C30 10 50 90 four typical parts input-output voltage (v) output current (ma) 10 17901.25 g02 0.1 1 0.5 2.5 2 1.5 1 0 t a = 125c t a = C55c t a = 25c temperature (c) C50 0 voltage differential (v) 0.1 0.3 0.4 0.5 1.0 0.7 C10 30 50 130 17091.25 g03 0.2 0.8 0.9 0.6 C30 10 70 90 110 5ma 100a 1ma output current (ma) 0.1 C2000 output voltage change (ppm) C1600 C1200 C800 C400 110 17901.25 g04 0 C1800 C1400 C1000 C600 C200 t a = C55c t a = 25c t a = 125c output current (ma) 0.1 0 output voltage change (ppm) 400 800 1200 1600 110 17901.25 g05 2000 200 600 1000 1400 1800 t a = C55c t a = 25c t a = 125c input voltage (v) supply current (a) 60 80 100 15 17901.25 g06 40 20 50 70 90 30 10 0 5 0 10 20 t a = C55c t a = 25c t a = 125c output voltage temperature drift load regulation (sourcing) minimum input-output voltage differential (sourcing) minimum input-output voltage differential (sinking) load regulation (sinking) supply current vs input voltage note 8: peak-to-peak noise is measured with a single pole highpass ? lter at 0.1hz and a 2-pole lowpass ? lter at 10hz. the unit is enclosed in a still air environment to eliminate thermocouple effects on the leads. the test time is 10 seconds. integrated rms noise is measured from 10hz to 1khz with the hp3561a analyzer. note 9: long-term drift typically has a logarithmic characteristic and therefore changes after 1000 hours tend to be smaller than before that time. long-term drift is affected by differential stress between the ic and the board material created during board assembly. see the applications information section. note 10: hysteresis in the output voltage is created by package stress that differs depending on whether the ic was previously at a higher or lower temperature. output voltage is always measured at 25c, but the ic is cycled to 85c or C40c before a successive measurements. hysteresis is roughly proportional to the square of the temperature change. hysteresis is not a problem for operational temperature excursions where the instrument might be stored at high or low temperature. see the applications information section. electrical characteristics each of the voltage options have similar performance curves. for the 3v, 3.3v and the 4.096v options, the curves can be estimated based on the 2.5v and 5v curves. lt1790 12 1790fb 1.25v typical performance characteristics input voltage (v) 0 output voltage (v) 1.255 1.265 1.275 1.285 16 17901.25. g07 1.245 1.235 1.250 1.260 1.270 1.280 1.240 1.230 1.225 4 8 12 218 6 10 14 20 t a = C55c t a = 25c t a = 125c frequency (hz) C60 power supply rejection ratio (db) 0 10 C70 C80 C10 C40 C20 C30 C50 100 10k 100k 1m 17901.25 g08 C90 1k v in = 3v c l = 1f frequency (hz) 1 output impedance () 10 100 100 10k 100k 17901.25 g09 0 1k 500 v in = 3v c l = 0.47f c l = 4.7f c l = 1f output to ground voltage (v) 0 current in r l (ma) 0.10 0.20 0.30 0.05 0.15 0.25 C2.0 C1.5 C1.0 C0.5 17091.25 g10 0 C2.5 Cv ee v out 3v r l 5k 4 2 1 6 1f lt1790-1.25 r1 10k t a = 25c t a = 125c t a = C55c hours 0 ppm 60 100 140 800 17901.25 g11 20 C20 40 80 120 0 C40 C60 200 400 600 1000 lt1790s6-1.25v 2 typical parts soldered to pcb t a = 30c time (sec) 0 output noise (5v/div) 8 17901.25 g12 246 10 7 135 9 frequency (hz) 10 2.0 noise voltage (v/hz) 2.5 3.0 3.5 4.0 100 1k 10k 17901.25 g13 1.5 1.0 0.5 0 4.5 5.0 c l = 1f i o = 100a i o = 0a i o = 250a i o = 1ma frequency (hz) 1 integrated noise (v rms ) 10 100 100 10 1000 17901.25 g14 line regulation output impedance vs frequency power supply rejection ratio vs frequency C 1.25v characteristics long-term drift (data points reduced after 500 hr) output noise 0.1hz to 10hz output voltage noise spectrum integrated noise 10hz to 1khz each of the voltage options have similar performance curves. for the 3v, 3.3v and the 4.096v options, the curves can be estimated based on the 2.5v and 5v curves. lt1790 13 1790fb 2.048v typical performance characteristics temperature (c) C50 output voltage (v) 70 90 110 2.056 2.054 2.052 2.050 2.048 2.046 2.044 2.042 17902.048 g01 C30 C10 10 30 50 130 four typical parts input-output voltage (v) 0.1 0.1 1 10 0.3 17902.048 g02 output current (ma) 0 0.7 0.2 0.4 0.5 0.6 t a = 25c t a = 125c t a = C55c temperature (c) C50 C50 voltage differential (mv) C30 10 30 50 70 130 17902.048 g03 C10 10 130 50 C10 110 30 C30 90 70 90 110 5ma 1ma 100a output current (ma) 0.1 C2000 output voltage change (ppm) C1600 C1200 C800 C400 110 17902.048 g04 0 C1800 C1400 C1000 C600 C200 t a = 25c t a = 125c t a = C55c output current (ma) 0.1 0 output voltage change (ppm) 400 800 1200 1600 110 17902.048 g05 2000 200 600 1000 1400 1800 t a = C40c t a = 25c t a = 125c input voltage (v) 0 supply current (a) 40 50 60 20 17902.048 g06 30 20 0 5 10 15 10 80 70 t a = C55c t a = 25c t a = 125c input voltage (v) output voltage (v) 2.054 2.052 2.050 2.048 2.046 2.044 2.042 4 8 12 16 17902.048 g07 20 2 0 6 10 14 18 t a = C55c t a = 25c t a = 125c frequency (hz) C60 power supply rejection ratio (db) 10 0 20 C70 C80 C10 C40 C20 C30 C50 100 10k 100k 1m 17902.048 g08 1k c l = 1f frequency (hz) 10k 1 output impedance () 10 100 1000 100k 1m 10m 17902.048 g09 c l = 0.47f c l = 4.7f c l = 1f output voltage temperature drift load regulation (sourcing) minimum input-output voltage differential (sourcing) minimum input-output voltage differential (sinking) load regulation (sinking) supply current vs input voltage line regulation output impedance vs frequency power supply rejection ratio vs frequency each of the voltage options have similar performance curves. for the 3v, 3.3v and the 4.096v options, the curves can be estimated based on the 2.5v and 5v curves. lt1790 14 1790fb 2.048v typical performance characteristics C 2.048v characteristics long-term drift output noise 0.1hz to 10hz output voltage noise spectrum integrated noise 10hz to 1khz output to ground voltage (v) 0 current in r l (ma) 0.10 0.20 0.30 0.05 0.15 0.25 C3.5 C3 C2.5 C2 C1.5 C1 C0.5 17092.048 g10 0 C4 Cv ee v out 3v r l 5k 4 2 1 6 1f lt1790-2.048 r1 10k t a = 125c t a = 25c t a = C55c hours 0 ppm 60 100 800 17902.048 g11 20 C20 40 80 0 C40 C60 C80 C100 200 400 600 1000 t a = 30c 2 typical parts soldered to pcb time (sec) 0 output noise (10v/div) 8 17902.048 g12 246 10 7 135 9 frequency (hz) 10 4 noise voltage ( v/hz) 5 6 7 8 100 1k 10k 17902.048 g13 3 2 1 0 9 10 c l = 1f i o = 100a i o = 0a i o = 250a i o = 1ma frequency (hz) 1 integrated noise (v rms ) 10 100 100 10 1000 17902.048 g14 each of the voltage options have similar performance curves. for the 3v, 3.3v and the 4.096v options, the curves can be estimated based on the 2.5v and 5v curves. lt1790 15 1790fb 2.5 typical performance characteristics temperature (c) C50 output voltage (v) 30 70 17902.5 g01 C30 C10 50 90 110 2.508 2.506 2.504 2.502 2.500 2.498 2.496 2.494 10 130 four typical parts input-output voltage (v) 0 0.1 0.2 0.1 output current (ma) 1 10 0.3 0.4 0.5 0.6 17902.5 g02 t a = C55c t a = 125c t a = 25c temperature (c) C50 C30 voltage differential (mv) C10 30 50 70 C10 30 50 130 17902.5 g03 10 C30 10 70 90 110 90 100a 5ma 1ma output current (ma) 0.1 C2000 output voltage change (ppm) C1600 C1200 C800 C400 110 17902.5 g04 0 C1800 C1400 C1000 C600 C200 t a = 25c t a = 125c t a = C55c output current (ma) 0.1 0 output voltage change (ppm) 400 800 1200 1600 110 17902.5 g05 2000 200 600 1000 1400 1800 t a = C55c t a = 25c t a = 125c input voltage (v) 0 supply current (a) 40 50 60 20 17902.5 g06 30 20 0 5 10 15 10 80 70 t a = C55c t a = 25c t a = 125c input voltage (v) output voltage (v) 2.515 2.510 2.505 2.500 2.495 2.490 2.489 4 8 12 16 17902.5 g07 20 2 0 6 10 14 18 t a = C55c t a = 25c t a = 125c frequency (hz) power supply rejection ratio (db) C40 C20 C30 0 20 C50 C80 C60 C70 C10 10 100 10k 100k 1m 17902.5 g08 1k c l = 1f frequency (hz) 100 1 output impedance () 10 100 1000 1k 10k 100k 17902.5 g09 c l = 4.7f c l = 0.47f c l = 1f output voltage temperature drift load regulation (sourcing) minimum input-output voltage differential (sinking) load regulation (sinking) supply current vs input voltage line regulation output impedance vs frequency power supply rejection ratio vs frequency minimum input-output voltage differential (sourcing) each of the voltage options have similar performance curves. for the 3v, 3.3v and the 4.096v options, the curves can be estimated based on the 2.5v and 5v curves. lt1790 16 1790fb 2.5v typical performance characteristics C 2.5v characteristics long-term drift (data points reduced after 500 hr) output noise 0.1hz to 10hz output voltage noise spectrum output to ground voltage (v) 0 0 current in r l (ma) 0.05 0.10 0.15 0.20 C1.0 C2.0 C3.0 C4.0 17902.5 g10 0.25 0.30 C0.5 C1.5 C2.5 C3.5 t a = 25c t a = 125c t a = C55c Cv ee v out 3v r l 5k 4 1, 2 6 1f lt1790-2.5 r1 10k time (sec) 0 output noise (10v/div) 8 17902.5 g12 246 10 7 135 9 hours 0 ppm 60 100 140 800 17902.5 g11 20 C20 40 80 120 0 C40 C60 200 400 600 1000 t a = 30c 2 typical parts soldered to pcb integrated noise 10hz to 1khz frequency (hz) 10 noise voltage (v/hz) 10 8 6 4 2 0 100 1k 10k 17902.5 g13 c l = 1f i o = 0a i o = 1ma i o = 250a frequency (hz) 1 integrated noise (v rms ) 10 100 100 10 1000 17902.5 g14 each of the voltage options have similar performance curves. for the 3v, 3.3v and the 4.096v options, the curves can be estimated based on the 2.5v and 5v curves. lt1790 17 1790fb 5v typical performance characteristics output voltage temperature drift load regulation (sourcing) minimum input-output voltage differential (sourcing) minimum input-output voltage differential (sinking) load regulation (sinking) supply current vs input voltage line regulation output impedance vs frequency power supply rejection ratio vs frequency temperature (c) C50 output voltage (v) 5.005 5.010 5.015 110 17905 g01 5.000 4.995 4.985 C10 30 70 C30 130 10 50 90 4.990 5.025 5.020 four typical parts input-output voltage (v) 0 0.1 0.2 0.1 output current (ma) 1 10 0.3 0.4 0.5 0.6 17905 g02 t a = C55c t a = 125c t a = 25c temperature (c) C50 C50 voltage differential (mv) C10 10 30 70 90 17905 g03 C30 C10 30 C30 90 10 50 130 110 50 70 100a 1ma 5ma output current (ma) 0.1 C2000 output voltage change (ppm) C1600 C1200 C800 C400 110 17905 g04 0 C1800 C1400 C1000 C600 C200 t a = 25c t a = 125c t a = C55c output current (ma) 0.1 0 output voltage change (ppm) 400 800 1200 1600 110 17905 g05 2000 200 600 1000 1400 1800 t a = C40c t a = 25c t a = 125c input voltage (v) 0 supply current (a) 40 50 60 20 17905 g06 30 20 0 5 10 15 10 80 70 t a = C55c t a = 25c t a = 125c frequency (hz) C60 power supply rejection ratio (db) 10 0 20 C70 C80 C10 C40 C20 C30 C50 100 10k 100k 1m 17905 g08 1k c l = 1f input voltage (v) output voltage (v) 5.04 5.02 5.00 4.98 4.96 4.94 4.92 4 8 12 16 17905 g07 20 2 0 6 10 14 18 t a = C55c t a = 25c t a = 125c frequency (hz) 100 1 output impedance () 10 100 1000 1k 10k 100k 17905 g09 c l = 4.7f c l = 0.47f c l = 1f each of the voltage options have similar performance curves. for the 3v, 3.3v and the 4.096v options, the curves can be estimated based on the 2.5v and 5v curves. lt1790 18 1790fb 5v typical performance characteristics C 5v characteristics long-term drift output noise 0.1hz to 10hz output voltage noise spectrum integrated noise 10hz to 1khz output to ground voltage (v) 0 current in r l (ma) 0.10 0.20 0.30 0.05 0.15 0.25 C8 C6 C4 C2 17905 g10 0 C9 C10 C7 C5 C3 C1 Cv ee v out 5.5v r l 5k 4 2 1 6 1f lt1790-5 r1 10k t a = C55c t a = 125c t a = 25c hours 0 ppm 60 100 800 17905 g11 20 C20 40 80 0 C40 C60 C80 C100 200 400 600 1000 t a = 30c 2 typical parts soldered to pcb time (sec) 0 output noise (20v/div) 8 17905 g12 246 10 7 135 9 frequency (hz) 10 noise voltage (v/hz) 10 8 6 4 2 0 100 1k 10k 17905 g13 c l = 1f i o = 0a i o = 1ma i o = 250a frequency (hz) 10 integrated noise (v rms ) 1000 100 10 1 100 1000 17905 g14 each of the voltage options have similar performance curves. for the 3v, 3.3v and the 4.096v options, the curves can be estimated based on the 2.5v and 5v curves. lt1790 19 1790fb applications information bypass and load capacitors the lt1790 voltage references should have an input bypass capacitor of 0.1f or larger, however the bypassing of other local devices may serve as the required component. these references also require an output capacitor for stability. the optimum output capacitance for most applications is 1f, although larger values work as well. this capaci- tor affects the turn-on and settling time for the output to reach its ? nal value. all lt1790 voltages perform virtually the same, so the lt1790-2.5 is used as an example. figure 1 shows the turn-on time for the lt1790-2.5 with a 1f input bypass and 1f load capacitor. figure 2 shows the output response to a 0.5v transient on v in with the same capacitors. the test circuit of figure 3 is used to measure the stability of various load currents. with r l = 1k, the 1v step produces a current step of 1ma. figure 4 shows the response to a 0.5ma load. figure 5 is the output response to a sourcing step from 4ma to 5ma, and figure 6 is the output response of a sinking step from C4ma to C5ma. figure 1. turn-on characteristics of lt1790-2.5 figure 2. output response to 0.5v ripple on v in figure 3. response time test circuit figure 4. lt1790-2.5 sourcing and sinking 0.5ma figure 5. lt1790-2.5 sourcing 4ma to 5ma lt1790-2.5 c in 0.1f c l 1f v gen 1790 f03 1v v in 3v 4 1, 2 1k 6 1790 f01 3v v in v out 2v 0v 1v 1790 f02 3v v in v out 2v 0v 1v 1790 f04 v gen v out (ac coupled) 3v 2v 1790 f05 v gen v out (ac coupled) C3v C2v lt1790 20 1790fb applications information figure 6. lt1790-2.5 sinking C 4ma to C5ma positive or negative operation series operation is ideal for extending battery life. if an lt1790 is operated in series mode it does not require an external current setting resistor. the speci? cations guar- antee that the lt1790 family operates to 18v. when the circuitry being regulated does not demand current, the series connected lt1790 consumes only a few hundred w, yet the same connection can sink or source 5ma of load current when demanded. a typical series connection is shown on the front page of this data sheet. the circuit in figure 7 shows the connection for a C 2.5v reference, although any lt1790 voltage option can be con? gured this way to make a negative reference. the lt1790 can be used as very stable negative references, however, they require a positive voltage applied to pin 4 to bias internal circuitry. this voltage must be current limited with r1 to keep the output pnp transistor from turning on and driving the grounded output. c1 provides stability during load transients. this connection maintains nearly the same accuracy and temperature coef? cient of the positive connected lt1790. long-term drift long-term drift cannot be extrapolated from accelerated high temperature testing. this erroneous technique gives drift numbers that are widely optimistic. the only way long-term drift can be determined is to measure it over the time interval of interest. the lt1790s6 drift data was taken on over 100 parts that were soldered into pc boards similar to a real world application. the boards were then placed into a constant temperature oven with t a = 30c, their outputs scanned regularly and measured with an 8.5 digit dvm. long-term drift curves are shown in the typical performance characteristics section. lt1790-2.5 c l 1f c1 0.1f 1790 f07 4 1, 2 6 r1 10k v out = C2.5v v ee 3v r l = v ee C v out 125a figure 7. using the lt1790-2.5 to build a C2.5v reference 1790 f06 v gen v out (ac coupled) 6v 4v 2v 0v 8v lt1790 21 1790fb applications information figure 9. worst-case C40c to 85c hysteresis on 80 units figure 8. worst-case 0c to 70c hysteresis on 79 units hysteresis hysteresis data shown in figures 8 and 9 represent the worst-case data taken on parts from 0c to 70c and from C 40c to 85c. units were cycled several times over these temperature ranges and the largest change is shown. as expected, the parts cycled over the higher temperature range have higher hysteresis than those cycled over the lower range. in addition to thermal hysteresis, the thermal shock as- sociated with high temperature soldering may cause the output to shift. for traditional pbsn solder temperatures, the output shift of the lt1790 is typically just 150ppm (0.015%). distribution (ppm) C60 C50 C40 C30 C20 C10 0 10 20 30 40 50 60 number of units 1790 f08 30 20 0 10 25 15 5 70c to 25c 0c to 25c distribution (ppm) C100 C80 C60 C40 C20 0 20 40 60 80 100 number of units 20 25 30 1790 f09 15 10 0 5 50 45 40 C40c to 25c 80c to 25c 35 for lead-free solder, ir reflow temperatures are much higher, often 240c to 260c at the peak. as a result, the packaging materials have been optimized to reduce v out shift as possible during high temperature reflow. in addi- tion, care should be taken when using lead-free solder to minimize the peak temperature and dwell time as much as is practical. a typical lead-free reflow profile is shown in figure 10. lt1790 units were heated using a similar profile, with a peak temperature of 250c. these parts were run through the heating process 3 times to show the cumulative effect of these heat cycles. figure 11 shows minutes 0246810 degrees (c) 150 120s 40s t l 130s ramp down t p 130s 1790 f10 75 0 300 225 380s t p = 260 t = 150c t = 190c t s(max) = 200c t l = 217c ramp to 150c figure 10. lead-free re? ow pro? le ppm 01020304050 number of units 4 5 6 1790 f11 3 2 0 1 9 8 7 figure 11. 1x ir re? ow peak temperature = 250c, delta output voltage (ppm) lt1790 22 1790fb applications information the shift after 1 cycle, while figure 12 shows shift after 3 cycles. in the worst case, shifts are typically 150ppm, but may be as high as 290ppm. shifts in output voltage are proportional to temperature and dwell time. in general, the output shift can be reduced or fully recov- ered by a long (12-24 hour) bake of the completed pc board assembly at high temperature (100c to 150c) after soldering to remove mechanical stress that has been induced by thermal shock. once the pc boards have cooled to room temperature, they may continue to shift for up to 3 times the bake time. this should be taken into account before any calibration is performed. assuming 80a max supply current for the lt1790, a 25a load, 120mv max dropout and a 4v to 30v input speci? cation, the largest that r1 can be is (4v C 3.3v C 120mv)/(80a + 25a) = 5.5k. furthermore, assum- ing 220mw of dissipation in the 18v sot-23 zener, this gives a max current of (220mw)/(18v) = 12.2ma. so the smallest that r1 should be is (30v C 18v)/12.2ma = 1k, rated at 150mw. with r1 = 1k, and assuming a 450mv worst-case drop- out, the lt1790 can deliver a minimum current of (4v C 3.3vC450mv)/(1k) = 250a. in figure 13, r1 and c1 provide ? ltering of the zener noise when the zener is in its noisy v-i knee. there are other variations for higher voltage operation that use a pass transistor shown in figures 14 and 15. these circuits allow the input voltage to be as high as 160v while maintaining low supply current. lt1790-3.3 4v to 30v c1 0.1f bzx84c18 1f v out r1 1790 f13 figure 13. extended supply range reference ppm 290 270 250 230 210 190 170 150 130 110 90 70 number of units 2.0 2.5 3.0 1790 f12 1.5 1.0 0 0.5 3.5 figure 12. 3x ir re? ow peak temperature = 250c, delta output voltage (ppm) lt1790 c1 0.1f c2 1f on semi mmbt5551 v s 6v to 160v v out 1790 f14 r2 4.7k r1 330k bzx84c12 lt1790 c2 1f bav99 v out 1790 f15 c1 0.1f r1 330k v s 6.5v to 160v on semi mmbt5551 figure 14. extended supply range reference figure 15. extended supply range reference higher input voltage the circuit in figure 13 shows an easy way to increase the input voltage range of the lt1790. the zener diode can be anywhere from 6v to 18v. for equal power sharing between r1 and the zener (at 30v), the 18v option is better. the circuit can tolerate much higher voltages for short periods and is suitable for transient protection. lt1790 23 1790fb applications information more output current the circuit in figure 16 is a compact, high output current, low dropout precision supply. the circuit uses the sot-23 lt1782 and the thinsot lt1790. resistive divider r1 and r2 set a voltage 22mv below v s . for under 1ma of output current, the lt1790 supplies the load. above 1ma of load current, the (+) input of the lt1782 is pulled below the 22mv divider reference and the output fet turns on to supply the load current. capacitor c1 stops oscillations in the transition region. the no load standing current is only 120a, yet the output can deliver over 300ma. noise an estimate of the total integrated noise from 10hz to 1khz can be made by multiplying the ? at band spot noise by bw . for example, from the typical performance curves, the lt1790-1.25 noise spectrum shows the average spot noise to be about 450nv/ hz . the square root of the bandwidth is 990 = 31.4. the total noise 10hz to 1khz noise is (450nv)(31.4) = 14.1v. this agrees well with the measured noise. this estimate may not be as good with higher voltage options, there are several reasons for this. higher voltage options have higher noise and they have higher variability due to process variations. 10hz to 1khz noise may vary by 2db on the lt1790-5 and 1db on the lt1790-2.5. measured noise may also vary because of peaking in the noise spectrum. this effect can be seen in the range of 1khz to 10khz with all voltage options sourcing different load currents. from the typical performance curves the 10hz to 1khz noise spectrum of the lt1790-5 is shown to be 3v/ hz at low frequency. the estimated noise is (3v)(31.4) = 93.4v. the actual integrated 10hz to 1khz noise measures 118.3v. the peaking shown causes this larger number. peaking is a function of output capacitor as well as load current and process variations. C + lt1790-2.5 lt1782 17909 f16 c2 1f note: not current limited v out = 2.5v i load = 0ma to 300ma r3 22 5% r1 680 5% v s 2.8v to 3.3v no load supply current 120a r2 100k 5% c1 0.1f r4 1k 5% vishay siliconix si3445dv figure 16. compact, high output current, low dropout, precision 2.5v supply lt1790 24 1790fb simplified schematic 4 v in 6 v out 1, 2 gnd 1790 ss lt1790 25 1790fb 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. package description s6 package 6-lead plastic tsot-23 (reference ltc dwg # 05-08-1636) 1.50 ?1.75 (note 4) 2.80 bsc 0.30 ?0.45 6 plcs (note 3) datum ? 0.09 ?0.20 (note 3) s6 tsot-23 0302 rev b 2.90 bsc (note 4) 0.95 bsc 1.90 bsc 0.80 ?0.90 1.00 max 0.01 ?0.10 0.20 bsc 0.30 ?0.50 ref pin one id 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. jedec package reference is mo-193 3.85 max 0.62 max 0.95 ref recommended solder pad layout per ipc calculator 1.4 min 2.62 ref 1.22 ref lt1790 26 1790fb linear technology corporation 1630 mccarthy blvd., milpitas, ca 95035-7417 (408) 432-1900 fax: (408) 434-0507 www.linear.com ? linear technology corporation 2000 lt 0609 rev b ? printed in usa related parts typical application part number description comments lt1019 precision reference low noise bandgap, 0.05%, 5ppm/c lt c ? 1798 micropower low dropout reference 0.15% max, 6.5a supply current lt1460 micropower precision series reference bandgap, 130a supply current, 10ppm/c, available in sot-23 lt1461 micropower precision low dropout reference bandgap 0.04%, 3ppm/c, 50a max supply current C 2.5v negative 50ma series reference no load supply current i cc = 1.6ma i ee = 440a lt1790-2.5 1f 2k v z = 5.1v v cc = 5v mps2907a v ee = C5v 5.1k 1790 ta03 4 1, 2 6 C2.5v 50ma |
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