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lt6654 1 6654ff for more information www.linear.com/lt6654 typical application description precision wide supply high output drive low noise reference the lt ? 6654 is a family of small precision voltage ref - erences that offers high accuracy , low noise , low drift , low dropout and low power . the lt6654 operates from voltages up to 36v and is fully specified from ?55 c to 125c. a buffered output ensures 10ma of output drive with low output impedance and precise load regulation . these features , in combination , make the lt6654 ideal for portable equipment , industrial sensing and control , and automotive applications. the lt6654 was designed with advanced manufactur - ing techniques and curvature compensation to provide 10ppm/ c temperature drift and 0 .05% initial accuracy . low thermal hysteresis ensures high accuracy and 1.6ppm p-p noise minimizes measurement uncertainty . since the lt6654 can also sink current , it can operate as a low power negative voltage reference with the same precision as a positive reference. the lt6654 references are offered in 6- lead sot-23 package and an 8- lead l s8 package . the l s8 is a 5mm 5mm surface mount hermetic package that provides outstanding stability.l , lt , lt c , lt m , linear technology and the linear logo are registered trademarks and thinsot is a trademark of linear technology corporation. all other trademarks are the property of their respective owners. basic connection n low drift: n a-grade: 10ppm/c max n b-grade: 20ppm/c max n high accuracy: n a-grade: 0.05% max n b-grade: 0.10% max n low noise: 1.6ppm p-p (0.1hz to 10hz) n wide supply range to 36v n low thermal hysteresis : l s8 15ppm (?40 c to 125 c) n long term drift: (ls8) 15ppm/ khr n line regulation (up to 36v): 5ppm/v max n low dropout voltage: 100mv max n sinks and sources 10ma n load regulation at 10ma: 8ppm/ma max n fully specified from ?55c to 125c n available output voltage options: 1.25v, 2.048v, 2.5v, 3v, 3.3v, 4.096v, 5v n low profile (1mm) thinsot? package and 5mm 5mm surface mount hermetic package features applications n automotive control and monitoring n high temperature industrial n high resolution data acquisition systems n instrumentation and process control n precision regulators n medical equipment output voltage temperature drift lt6654 c in 0.1f (v out + 0.5v) < v in < 36v out in gnd c l 1f v out 6654 ta01a temperature (c) ?60 ?0.10 v out accuracy (%) ?0.05 0.05 0.00 0.10 40 20 0 ?40 ?20 6654 ta01b 140 100 120 60 80 3 typical parts lt6654-2.5 downloaded from: http:///
lt6654 2 6654ff for more information www.linear.com/lt6654 pin configuration absolute maximum ratings (note 1) 12 3 65 4 top view s6 package 6-lead plastic tsot-23 v out dncv in gnd* gnd dnc t jmax = 150c, ja = 192c/w dnc: connected internally do not connect external circuitry to these pins *connect pin to device gnd (pin 2) 12 3 dnc nc gnd 76 5 dncv out v out 4 gnd* 8 v in top view ls8 package 8-pin leadless chip carrier (5mm 5mm) t jmax = 150c, ja = 125c/w dnc: connected internally do not connect external circuitry to these pins *connect pin to device gnd (pin 3) input voltage v in to gnd ........................... ?0. 3v to 38v output voltage v out ........................ ?0. 3v to v in + 0. 3v output short-circuit duration ......................... indefinite specified temperature range h-grade ............................................. ? 40 c to 125c mp-grade .......................................... ? 55 c to 125c operating temperature range ............... ? 55 c to 125c storage temperature range ( note 2 ) ..... ? 65 c to 150c lead temperature ( soldering , 10 sec .) ( note 9 ) ................................................................. 300 c downloaded from: http:///
lt6654 3 6654ff for more information www.linear.com/lt6654 order information lead free finish tape and reel (mini) tape and reel part marking* package description specified temperature range lt6654ahs6-1.25#trmpbf lt6654ahs6-1.25#trpbf ltfvd 6-lead plastic tsot-23 ?40c to 125c lt6654bhs6-1.25#trmpbf lt6654bhs6-1.25#trpbf ltfvd 6-lead plastic tsot-23 ?40c to 125c lt6654amps6-1.25#trmpbf lt6654amps6-1.25#trpbf ltfvd 6-lead plastic tsot-23 ?55c to 125c lt6654bmps6-1.25#trmpbf lt6654bmps6-1.25#trpbf ltfvd 6-lead plastic tsot-23 ?55c to 125c lt6654ahs6-2.048#trmpbf lt6654ahs6-2.048#trpbf ltfvf 6-lead plastic tsot-23 ?40c to 125c lt6654bhs6-2.048#trmpbf lt6654bhs6-2.048#trpbf ltfvf 6-lead plastic tsot-23 ?40c to 125c lt6654amps6-2.048#trmpbf lt6654amps6-2.048#trpbf ltfvf 6-lead plastic tsot-23 ?55c to 125c lt6654bmps6-2.048#trmpbf lt6654bmps6-2.048#trpbf ltfvf 6-lead plastic tsot-23 ?55c to 125c lt6654ahs6-2.5#trmpbf lt6654ahs6-2.5#trpbf ltfjy 6-lead plastic tsot-23 ?40c to 125c lt6654bhs6-2.5#trmpbf lt6654bhs6-2.5#trpbf ltfjy 6-lead plastic tsot-23 ?40c to 125c lt6654amps6-2.5#trmpbf lt6654amps6-2.5#trpbf ltfjy 6-lead plastic tsot-23 ?55c to 125c lt6654bmps6-2.5#trmpbf lt6654bmps6-2.5#trpbf ltfjy 6-lead plastic tsot-23 ?55c to 125c lt6654ahs6-3#trmpbf lt6654ahs6-3#trpbf ltfvg 6-lead plastic tsot-23 ?40c to 125c lt6654bhs6-3#trmpbf lt6654bhs6-3#trpbf ltfvg 6-lead plastic tsot-23 ?40c to 125c lt6654amps6-3#trmpbf lt6654amps6-3#trpbf ltfvg 6-lead plastic tsot-23 ?55c to 125c lt6654bmps6-3#trmpbf lt6654bmps6-3#trpbf ltfvg 6-lead plastic tsot -23 ?55c to 125c lt6654ahs6-3.3#trmpbf lt6654ahs6-3.3#trpbf ltfvh 6-lead plastic tsot-23 ?40c to 125c lt6654bhs6-3.3#trmpbf lt6654bhs6-3.3#trpbf ltfvh 6-lead plastic tsot-23 ?40c to 125c lt6654amps6-3.3#trmpbf lt6654amps6-3.3#trpbf ltfvh 6-lead plastic tsot-23 ?55c to 125c lt6654bmps6-3.3#trmpbf lt6654bmps6-3.3#trpbf ltfvh 6-lead plastic tsot-23 ?55c to 125c lt6654ahs6-4.096#trmpbf lt6654ahs6-4.096#trpbf ltfvj 6-lead plastic tsot-23 ?40c to 125c lt6654bhs6-4.096#trmpbf lt6654bhs6-4.096#trpbf ltfvj 6-lead plastic tsot-23 ?40c to 125c lt6654amps6-4.096#trmpbf lt6654amps6-4.096#trpbf ltfvj 6-lead plastic tsot-23 ?55c to 125c lt6654bmps6-4.096#trmpbf lt6654bmps6-4.096#trpbf ltfvj 6-lead plastic tsot-23 ?55c to 125c lt6654ahs6-5#trmpbf lt6654ahs6-5#trpbf ltfvk 6-lead plastic tsot-23 ?40c to 125c lt6654bhs6-5#trmpbf lt6654bhs6-5#trpbf ltfvk 6-lead plastic tsot-23 ?40c to 125c lt6654amps6-5#trmpbf lt6654amps6-5#trpbf ltfvk 6-lead plastic tsot-23 ?55c to 125c lt6654bmps6-5#trmpbf lt6654bmps6-5#trpbf ltfvk 6-lead plastic tsot-23 ?55c to 125c lead free finish ? part marking* package description specified temperature range lt6654ahls8-2.048#pbf 542048 8-lead ceramic lcc (5mm 5mm) ?40c to 125c lt6654bhls8-2.048#pbf 542048 8-lead ceramic lcc (5mm 5mm) ?40c to 125c lt6654ahls8-2.5#pbf 665425 8-lead ceramic lcc (5mm 5mm) ?40c to 125c lt6654bhls8-2.5#pbf 665425 8-lead ceramic lcc (5mm 5mm) ?40c to 125c lt6654ahls8-4.096#pbf 544096 8-lead ceramic lcc (5mm 5mm) ?40c to 125c lt6654bhls8-4.096#pbf 544096 8-lead ceramic lcc (5mm 5mm) ?40c to 125c lt6654ahls8-5#pbf 66545 8-lead ceramic lcc (5mm 5mm) ?40c to 125c lt6654bhls8-5#pbf 66545 8-lead ceramic lcc (5mm 5mm) ?40c to 125c trm = 500 pieces. *temperature grades are identified by a label on the shipping container. consult ltc marketing for parts specified with wider operating temperature ranges. for more information on lead free part marking, go to: http://www.linear.com/leadfree/ for more information on tape and reel specifications, go to: http://www.linear.com/tapeandreel/ . some packages are available in 500 unit reels through designated sales channels with #trmpbf suffix. ? this product is only offered in trays. for more information go to: http://www.linear.com/packaging/ downloaded from: http:///
lt6654 4 6654ff for more information www.linear.com/lt6654 available options output voltage initial accuracy temperature coefficient order part number** specified temperature range 1.25v 0.05% 0.1% 0.05% 0.1% 10ppm/c 20ppm/c 10ppm/c 20ppm/c lt6654ahs6-1.25 lt6654bhs6-1.25 lt6654amps6-1.25 lt6654bmps6-1.25 ?40c to 125c ?40c to 125c ?55c to 125c ?55c to 125c 2.048v 0.05% 0.05% 0.1% 0.1% 0.05% 0.1% 10ppm/c 10ppm/c 20ppm/c 20ppm/c 10ppm/c 20ppm/c lt6654 ahs6-2.048 lt6654ahls8-2.048 lt6654bhs6-2.048 lt6654bhls8-2.048 lt6654amps6-2.048 lt6654bmps6-2.048 ?40c to 125c ?40c to 125c ?40c to 125c ?40c to 125c ?55c to 125c ?55c to 125c 2 .5v 0.05% 0.05% 0.1% 0.1% 0.05% 0.1% 10ppm/c 10ppm/c 20ppm/c 20ppm/c 10ppm/c 20ppm/c lt6654 ahs6-2.5 lt6654ahls8-2.5 lt6654bhs6-2.5 lt6654bhls8-2.5 lt6654amps6-2.5 lt6654bmps6-2.5 ?40c to 125c ?40c to 125c ?40c to 125c ?40c to 125c ?55c to 125c ?55c to 125c 3v 0 .05% 0.1% 0.05% 0.1% 10ppm/c 20ppm/c 10ppm/c 20ppm/c lt6654ahs6-3 lt6654bhs6-3 lt6654amps6-3 lt6654bmps6-3 ?40c to 125c ?40c to 125c ?55c to 125c ?55c to 125c 3.3v 0.05% 0.1% 0.05% 0.1% 10ppm/c 20ppm/c 10ppm/c 20ppm/c lt6654ahs6-3.3 lt6654bhs6-3.3 lt6654amps6-3.3 lt6654bmps6-3.3 ?40c to 125c ?40c to 125c ?55c to 125c ?55c to 125c 4.096v 0.05% 0.05% 0.1% 0.1% 0.05% 0.1% 10ppm/c 10ppm/c 20ppm/c 20ppm/c 10ppm/c 20ppm/c lt6654 ahs6-4.096 lt6654ahls8-4.096 lt6654bhs6-4.096 lt6654bhls8-4.096 lt6654amps6-4.096 lt6654bmps6-4.096 ?40c to 125c ?40c to 125c ?40c to 125c ?40c to 125c ?55c to 125c ?55c to 125c 5v 0 .05% 0.05% 0.1% 0.1% 0.05% 0.1% 10ppm/c 10ppm/c 20ppm/c 20ppm/c 10ppm/c 20ppm/c lt6654 ahs6-5 lt6654ahls8-5 lt6654bhs6-5 lt6654bhls8-5 lt6654amps6-5 lt6654bmps6-5 ?40c to 125c ?40c to 125c ?40c to 125c ?40c to 125c ?55c to 125c ?55c to 125c ** see the order information section for complete part number listing. downloaded from: http:///
lt6654 5 6654ff for more information www.linear.com/lt6654 electrical characteristics the l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at t a = 25c, c l = 1f and v in = v out + 0.5v, unless otherwise noted. for lt6654-1.25, v in = 2.4v, unless otherwise noted. parameter conditions min typ max units output voltage accuracy lt6654a lt6654b lt6654ah lt6654bh lt6654amp lt6654bmp l l l l ?0.05 ?0.10 ?0.215 ?0.43 ?0.23 ?0.46 0 .05 0.10 0.215 0.43 0.23 0.46 % % % % % % output v oltage t emperature coefficient (note 3) lt6654a lt6654b l l 3 10 10 20 ppm/c ppm/c line regulation v out + 0.5v v in 36v lt6654-2.048, lt6654-2.5, lt6654-3, lt6654-3.3, lt6654-4.096, lt6654-5 l 1.2 5 10 ppm/v ppm/v 2.4v v in 36v lt6654-1.25 l 1.2 5 10 ppm/v ppm/v load regulation (note 4) i out(source) = 10ma lt6654-2.048, lt6654-2.5, lt6654-3, lt6654-3.3, lt6654-4.096, lt6654-5 lt6654-1.25 lt6654ls8 l l l 3 6 10 8 15 15 20 30 45 ppm/ma ppm/ma ppm/ma ppm/ma ppm/ma ppm/ma load regulation (note 4) i out(sink) = 10ma lt6654-2.048, lt6654-2.5, lt6654-3, lt6654-3.3, lt6654-4.096, lt6654-5 lt6654-1.25 lt6654ls8 l l l 9 15 30 20 30 25 30 60 90 ppm/ma ppm/ma ppm/ma ppm/ma ppm/ma ppm/ma dropout v oltage (note 5) v in ? v out , ?v out = 0.1% i out = 0ma lt6654-2.048, lt6654-2.5, lt6654-3, lt6654-3.3, lt6654-4.096, lt6654-5 i out(source) = 10ma i out(sink) = ?10ma l l l 55 100 120 450 50 mv mv mv mv minimum input v oltage lt6654-1.25, ?v out = 0.1%, i out = 0ma lt6654-1.25, ?v out = 0.1%, i out = 10ma l l 1.5 1.6 1.8 2.4 v v v supply current no load l 350 600 a a output short-circuit current short v out to gnd short v out to v in 40 30 ma ma output voltage noise (note 6) 0.1hz f 10hz lt6654-1.25 lt6654-2.048 lt6654-2.5 lt6654-3 lt6654-3.3 lt6654-4.096 lt6654-5 10hz f 1khz 0.8 1.0 1.5 1.6 1.7 2.0 2.2 2.0 ppm p-p ppm p-p ppm p-p ppm p-p ppm p-p ppm p-p ppm p-p ppm rms turn-on time 0.1% settling, c load = 1f 150 s downloaded from: http:///
lt6654 6 6654ff for more information www.linear.com/lt6654 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: if the parts are stored outside of the specified temperature range, the output may shift due to hysteresis.note 3: temperature coefficient is measured by dividing the maximum change in output voltage by the specified temperature range.note 4: load regulation is measured on a pulse basis from no load to the specified load current. output changes due to die temperature change must be taken into account separately. note 5 : excludes load regulation errors. note 6 : peak-to-peak noise is measured with a 1-pole highpass filter at 0.1hz and 2-pole lowpass filter at 10hz. the unit is enclosed in a still-air environment to eliminate thermocouple effects on the leads. the test time is 10 seconds. rms noise is measured on a spectrum analyzer in a shielded environment where the intrinsic noise of the instrument is removed to determine the actual noise of the device. note 7: long-term stability typically has a logarithmic characteristic and therefore, changes after 1000 hours tend to be much smaller than before that time. total drift in the second thousand hours is normally less than one third that of the first thousand hours with a continuing trend toward reduced drift with time. long-term stability will also be affected by differential stresses between the ic and the board material created during board assembly. note 8: hysteresis in 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 the hot or cold temperature limit before successive measurements. hysteresis measures the maximum output change for the averages of three hot or cold temperature cycles. for instruments that are stored at well controlled temperatures (within 20 or 30 degrees of operational temperature), it is usually not a dominant error source. typical hysteresis is the worst-case of 25c to cold to 25c or 25c to hot to 25c, preconditioned by one thermal cycle. note 9: the stated temperature is typical for soldering of the leads during manual rework. for detailed ir reflow recommendations, refer to the applications information section. parameter conditions min typ max units long-term drift of output voltage (note 7) lt6654s6 lt6654ls8 60 15 ppm/ khr ppm/ khr hysteresis (note 8) s6 ? t = 0c to 70c ? t = ?40c to 85c ? t = ?40c to 125c ? t = ?55c to 125c ls8 ? t = 0c to 70c ? t = ?40c to 85c ? t = ?40c to 125c ? t = ?55c to 125c 15 30 40 50 3 11 15 20 ppm ppm ppm ppm ppm ppm ppm ppm the l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at t a = 25c, c l = 1f and v in = v out + 0.5v, unless otherwise noted. for lt6654-1.25, v in = 2.4v, unless otherwise noted. electrical characteristics downloaded from: http:///
lt6654 7 6654ff for more information www.linear.com/lt6654 typical performance characteristics 1.25v load regulation (sourcing) 1.25v load regulation (sinking) 1.25v output noise 0.1hz to 10hz 1.25v minimum input voltage (sourcing) 1.25v minimum input voltage (sinking) 1.2v output voltage noise spectrum 1.25v output voltage temperature drift 1.25v turn-on characteristics 1.25v output impedance vs frequency temperature (c) ?60 1.2485 1.2490 1.2495 reference voltage (v) 1.2500 1.2505 1.2510 1.2515 1.2520 ?40 ?20 0 6654 g01 20 40 60 80 140 100 120 three typical parts output current (ma) 0.1 ?50 ?40 output voltage change (ppm) ?30 ?20 ?10 0 3020 10 1 6654 g04 10 ?40c 25c 125c ?55c output current (ma) 0.1 0 output voltage change (ppm) 40 8020 60 100 140 160 180120 200 1 6654 g05 10 125c ?40c ?55c 25c output noise (1v/div) time (1s/div) 6654 g06 10 9 8 7 6 5 4 3 2 1 0 minimum input voltage (v) 1 1.2 1.4 1.6 1.8 2 2.2 0.1 output current (ma) 1 10 6654 g07 2.4 25c ?40c ?55c 125c minimum input voltage (v) 1 1.1 1.2 1.3 1.4 1.5 1.6 1.7 0.1 output current (ma) 1 10 6654 g08 1.8 ?40c ?55c 125c 25c frequency (khz) 0.01 0.1 1 10 0 50 100 150 250 300 350 noise volt age (nv hz ) 200 400 6654 g09 100 i o = 5ma i o = 0a the characteristic curves are similar across the lt6654 family . curves from the lt6654 -1 . 25 , lt6654 -2 . 5 and the lt6654 -5 represent the full range of typical performance of all voltage options . characteristic curves for other output voltages fall between these cur ves and can be estimated based on their output . 20s/div gndgnd v in 1v/div v out 0.5v/div 6654 g02 c load = 1f frequency (khz) 0.1 0.01 output impedance () 0.1 10 1 100 1 10 100 6654 g03 1000 c l = 1f c l = 10f downloaded from: http:///
lt6654 8 6654ff for more information www.linear.com/lt6654 typical performance characteristics 2.5v load regulation (sourcing) 2.5v load regulation (sinking) 2.5v output noise 0.1hz to 10hz 2.5v minimum v in to v out differential (sourcing) 2.5v minimum v in to v out differential (sinking) 2.5v output voltage noise spectrum 2.5v output voltage temperature drift 2.5v supply current vs input voltage 2.5v line regulation temperature (c) ?60 ?20 20 60 140 100 2.498 2.499 2.500 2.501 output voltage (v) 2.502 6654 g10 three typical parts input voltage (v) 0 5 10 15 20 25 30 35 0 input current (a) 300 600500 400 100 200 6654 g11 40 ?55c 125c ?40c 25c input voltage (v) 0 5 10 15 20 25 30 35 2.4950 2.4960 output voltage (v) 2.5000 2.50502.5030 2.5010 2.50402.5020 2.4970 2.4980 2.4990 6654 g12 40 ?40c ?55c 25c 125c output current (ma) 0.1 1 ?40 ?30 ?20 ?10 output voltage change (ppm) 0 10 6654 g13 10 ?55c 25c 125c ?40c output current (ma) 0.1 1 0 100 120 140 output voltage change (ppm) 160 20 40 60 80 180 6654 g14 10 125c ?55c ?40c 25c time (1s/div) output noise (1v/div) 6654 g15 input-output voltage (mv) 0 200 300 0.1 1 output current (ma) 10 6654 g16 400 150 100 50 250 350 25c ?55c ?40c 125c input-output voltage (mv) ?300 ?100 0 0.1 1 output current (ma) 10 6654 g17 100 ?150 ?200 ?250 ?50 50 ?40c 25c ?55c 125c frequency (khz) 0.01 0.1 1 10 0 50 100 150 250 300 350 noise volt age (nv hz ) 200 400 6654 g18 100 i o = 5ma i o = 0a the characteristic curves are similar across the lt6654 family . curves from the lt6654 -1 . 25 , lt6654 -2 . 5 and the lt6654 -5 represent the full range of typical performance of all voltage options . characteristic curves for other output voltages fall between these cur ves and can be estimated based on their output . downloaded from: http:///
lt6654 9 6654ff for more information www.linear.com/lt6654 typical performance characteristics 2.5v turn-on characteristics 2.5v line transient response 2.5v load transient response (sourcing) 2.5v hysteresis plot for ?40c and 125c (tsot-23) 2.5v hysteresis plot for ?40c and 125c (ls8) 2.5v long term drift (tsot-23) 2.5v integrated noise 10hz to 10khz 2.5v power supply rejection ratio vs frequency 2.5v output impedance vs frequency frequency (khz) 0.01 0.1 1 0.1 1 10 integrated noise (v rms ) 100 6654 g19 10 frequency (khz) 0.1 1 10 100 ?100 ?90 ?80 ?70 ?50 ?40 ?30 power supply rejection ratio (db) ?60 ?20 6654 g20 1000 c l = 1f c l = 10f frequency (khz) 1 10 100 0.1 1 10 output impedance () 100 6654 g21 1000 c l = 10f c l = 1f 20s/div gndgnd v in 1v/div v out 1v/div 6654 g22 c load = 1f 50s/div v in 0.5v/div 3v/dc v out 2mv/div/ac 2.5v/dc 6654 g23 c load = 1f 50s/div i out 0ma v out 20mv/div/ac 2.5v/dc 6654 g24 c load = 1f 5ma distribution (ppm) ? 150 0 number of units 4 8 12 16 20 24 28 32 36 40 44 48 ?1 00 ? 125 ?50 ?75 6654 g25 ?25 0 25 1 00 1 25 1 50 50 75 max avg hot cycle 25c to 125c to 25c max avg cold cycle 25c to ?40c to 25c time (hours) 0 400 800 1600 1200 ?150 ?120 ?90 ?60 0 ?30 120 output voltage change (ppm) 150 6030 90 6654 g26 2000 t a = 35c the characteristic curves are similar across the lt6654 family . curves from the lt6654 -1 . 25 , lt6654 -2 . 5 and the lt6654 -5 represent the full range of typical performance of all voltage options . characteristic curves for other output voltages fall between these cur ves and can be estimated based on their output . distribution (ppm) 0 number of units 32 1 54 6 25c to ?40c to 25cand 25c to 125c to 25c ?40 ?30 ?20 ?10 0 10 6654 g37 20 30 40 downloaded from: http:///
lt6654 10 6654ff for more information www.linear.com/lt6654 typical performance characteristics 5v load regulation (sourcing) 5v load regulation (sinking) 5v output noise 0.1hz to 10hz 5v minimum v in to v out differential (sourcing) 5v output voltage temperature drift 5v turn-on characteristics 5v output impedance vs frequency temperature (c) ?60 0 80 60 40 20 ?40 ?20 120 100 4.993 4.994 4.995 4.996 4.9984.997 5.002 reference voltage (v) 5.003 5.0004.999 5.001 6654 g28 140 three typical parts 50s/div gnd gnd v out 2v/div v in 2v/div 6654 g29 c load = 1f output current (ma) 0.1 1 ?20 10 0 output voltage change (ppm) 5040 30 20 6654 g31 10 ?10 125c ?40c 25c ?55c output current (ma) 0.1 1 0 6040 output voltage change (ppm) 220120 100 80 140 200180 160 6654 g32 10 20 ?55c 25c ?40c 125c output noise (4v/div) time (1s/div) 6654 g33 10 9 8 7 6 5 4 3 2 1 0 input-output voltage (mv) 0 50 100 150 200 250 300 350 0.1 output current (ma) 1 10 6654 g34 400 125c ?40c ?55c 25c frequency (khz) 0.1 1 10 100 0.01 0.1 1 10 output impedance () 100 6654 g30 1000 c l = 10f c l = 1f the characteristic curves are similar across the lt6654 family . curves from the lt6654 -1 . 25 , lt6654 -2 . 5 and the lt6654 -5 represent the full range of typical performance of all voltage options . characteristic curves for other output voltages fall between these cur ves and can be estimated based on their output . 2.5v load transient response (sinking) 50s/div 0ma v out 20mv/div/ac 2.5v/dc 6654 g27 c load = 1f i out 5ma 2.5v long term drift (ls8) time (hours) 0 ppm 150?90 ?60 ?30 30 60 90 120 0 ?150 ?120 1000 500 6654 g38 2000 1500 downloaded from: http:///
lt6654 11 6654ff for more information www.linear.com/lt6654 5v minimum v in to v out differential (sinking) 5v output voltage noise spectrum input-output voltage (mv) ?300 ?250 ?200 ?150 ?100 ?50 0 50 0.1 output current (ma) 1 10 6654 g35 100 25c ?55c ?40c 125c frequency (khz) 0.01 0.1 1 10 0 50 100 150 250 300 350 noise volt age (nv hz ) 200 450 500 550400 600 6654 g36 100 i o = 5ma i o = 0a the characteristic curves are similar across the lt6654 family . curves from the lt6654 -1 . 25 , lt6654 -2 . 5 and the lt6654 -5 represent the full range of typical performance of all voltage options . characteristic curves for other output voltages fall between these cur ves and can be estimated based on their output . pin functions dnc ( pins 1 , 7 ): do not connect . keep leakage current from this pin to v in or gnd to a minimum. nc ( pin 2 ): not internally connected . may be tied to v in , v out , gnd or floated. gnd ( pin 3 ): internal function . this pin must be tied to gnd near pin 4. gnd ( pin 4 ): primary device ground . pin 3 and the load ground should be star-connected to pin 4. v out ( pin 5 ): v out pin . an output capacitor of 1f or greater is required for stable operation.v out ( pin 6 ): v out pin . tie to pin 5 for proper load regu - lation.v in ( pin 8 ): power supply . bypass v in with a 0.1f, or larger, capacitor to gnd. gnd ( pin 1 ): internal function . this pin must be tied to ground, near pin 2.gnd (pin 2): primary device ground. dnc ( pin 3 ): do not connect . keep leakage current from this pin to v in or gnd to a minimum. v in ( pin 4 ): power supply . bypass v in with a 0.1f capacitor to ground. dnc ( pin 5 ): do not connect . keep leakage current from this pin to v in or gnd to a minimum. v out ( pin 6 ): output voltage . an output capacitor of 1f minimum is required for stable operation. (ls8) (tsot) typical performance characteristics downloaded from: http:///
lt6654 12 6654ff for more information www.linear.com/lt6654 block diagrams ? + v out 6 4 6654 bd bandgap v in 3 5 dncdnc gnd gnd 2 1 ? + v out v out 5 6 8 6654 bda bandgap v in 7 1 dncdnc gnd nc gnd 3 4 2 sot23 ls8 downloaded from: http:///
lt6654 13 6654ff for more information www.linear.com/lt6654 bypass and load capacitors the lt6654 voltage references should have an input by- pass capacitor of 0.1f or larger , however the bypassing on other components nearby is sufficient . in high voltage applications, v in > 30v, an output short-circuit to ground can create an input voltage transient that could exceed the maximum input voltage rating . to prevent this worst-case condition, an rc input line filter of 10s (i.e. 10 and 1f) is recommended . 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 capacitor affects the turn-on and settling time for the output to reach its final value.figure 1 shows the turn-on time for the lt6654-2. 5 with a 0.1f 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 with various load currents . with r l = 1k, the 1v step pro - duces 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 4ma to 5ma. applications information figure 1. turn-on characteristics of lt6654-2.5 lt6654-2.5 c in 0.1f v in 3v c l 1f v gen 1k 6654 f03 1v out in gnd figure 2. output response to 0.5v ripple on v in figure 3. load current response time test circuit 20s/div gndgnd v in 1v/div v out 1v/div 6654 f01 c load = 1f 50s/div v in 0.5v/div 3v/dc v out 2mv/div/ac 2.5v/dc 6654 f02 c load = 1f downloaded from: http:///
lt6654 14 6654ff for more information www.linear.com/lt6654 figure 4. lt6654-2.5 sourcing and sinking 0.5ma figure 5. lt6654-2.5 sourcing 4ma to 5ma figure 6. lt6654-2.5 sinking 4ma to 5ma 50s/div i out ?0.5ma v out 20mv/div/ac 2.5v/dc 6654 f04 c load = 1f 0.5ma applications information 50s/div i out 4ma v out 10mv/div/ac 2.5v/dc 6654 f05 c load = 1f 5ma 50s/div i out ?5ma v out 10mv/div/ac 2.5v/dc 6654 f06 c load = 1f ?4ma positive or negative operationin addition to the series connection , as shown on the front page of this data sheet , the lt6654 can be operated as a negative voltage reference. the circuit in figure 7 shows an lt6654 configured for negative operation . in this configuration , a positive volt - age is required at v in ( pin 4 ) to bias the lt6654 internal circuitry. this voltage must be current limited with r1 to keep the output pnp transistor from turning on and driv - ing the grounded output . c1 provides stability during load transients . this connection maintains the same accuracy and temperature coefficient of the positive connected lt6654. figure 7. using the lt6654-2.5 to build a ?2.5v reference lt6654-2.5 v ee v out = ?2.5v 0.1f 3v r1 4.7k 6654 f07 c1 1f v ee ? v out 550a + i out r out in gnd downloaded from: http:///
lt6654 15 6654ff for more information www.linear.com/lt6654 applications information similar to a real world application. the boards were then placed into a constant temperature oven with t a = 35 c, their outputs scanned regularly and measured with an 8 .5 digit dvm . long-term drift curves are shown in figure 8 . their drift is much smaller after the first thousand hours . long-term drift long-term drift cannot be extrapolated from accelerated high temperature testing . this erroneous technique gives drift numbers that are wildly optimistic . the only way long-term drift can be determined is to measure it over the time interval of interest . the lt6654 drift data was taken on 40 parts that were soldered into pc boards figure 8. lt6654-2.5 long term drift time (hours) 0 200 400 800 600 ?80 ?40 0 output voltage change (ppm) 8040 6654 f08a 1000 lt6654-2.5 s6 package first thousand hours time (hours) 1000 1200 1400 1800 1600 ?80 ?40 0 output voltage change (ppm) 8040 6654 f08b 2000 lt6654-2.5 s6 package second thousand hours (normalized to the first thousand hours) time (hours) 0 ppm 80 ?40 40 0 ?80 1000 500 6654 g38 2000 1500 lt6654-2.5 ls8 package downloaded from: http:///
lt6654 16 6654ff for more information www.linear.com/lt6654 figure 11a. lt6654 s6 thermal hysteresis ?40c to 125c figure 11b. lt6654 ls8 thermal hysteresis ?40c to 125c distribution (ppm) ? 150 0 number of units 10 20 30 40 50 ?1 00 ?50 6654 f11 0 1 00 1 50 50 max avg hot cycle 25c to 125c to 25c max avg cold cycle 25c to ?40c to 25c applications information figure 9. maximum allowed power dissipation of the lt6654 figure 10. typical power dissipation of the lt6654 temperature (c) 0 0 power (w) 0.1 0.2 0.60.5 0.4 0.3 0.7 20 40 60 80 6654 f09 100 120 140 t = 150c ja = 192c/w 130mw v in (v) 0 0 power (w) 0.05 0.250.20 0.15 0.10 0.400.35 0.30 5 10 15 6654 f10 20 25 30 35 40 10ma load no load 335mw power dissipationthe power dissipation in the lt6654 is dependent on v in , load current and the package . the lt6654 package has a thermal resistance , or ja , of 192 c/w. a curve that illustrates allowed power dissipation versus temperature for the 6- lead sot-23 package is shown in figure 9 . the power dissipation of the lt6654-2. 5 as a function of input voltage is shown in figure 10 . the top curve shows power dissipation with a 10ma load and the bottom curve shows power dissipation with no load . when operated within its specified limits of v in = 36v and sourcing 10ma, the lt6654-2 . 5 consumes about 335mw at room temperature . the power-derating curve in figure 9 shows the lt6654- 2. 5 can only safely dissipate 130mw at 125 c, which is less than its maximum power output . care must be taken when designing the circuit so that the maximum junction temperature is not exceeded . for best performance , junc - tion temperature should be kept below 125c. the lt6654 includes output current limit circuitry , as well as thermal limit circuitry , to protect the reference from damage in the event of excessive power dissipation . the lt6654 is protected from damage by a thermal shutdown circuit. however , changes in performance may occur as a result of operation at high temperature. 6654 f11b distribution (ppm) 0 number of units 32 1 54 6 25c to ?40c to 25cand 25c to 125c to 25c ?40 ?30 ?20 ?10 0 10 20 30 40 downloaded from: http:///
lt6654 17 6654ff for more information www.linear.com/lt6654 applications information hysteresisthe hysteresis data is shown in figure 11 . the lt6654 is capable of dissipating relatively high power . for example , with a 36v input voltage and 10ma load current applied to the lt6654-2.5, the power dissipation is p d = 33.5v ? 10ma = 335mw, which causes an increase in the die temperature of 64 c. this could increase the junction temperature above 125 c (t jmax is 150 c) and may cause the output to shift due to thermal hysteresis.pc board layout the mechanical stress of soldering a surface mount volt - age reference to a pc board can cause the output voltage to shift and temperature coefficient to change . these two changes are not correlated . for example , the voltage may shift but the temperature coefficient may not. to reduce the effects of stress-related shifts , mount the reference near the short edge of the pc board or in a corner. in addition , slots can be cut into the board on two sides of the device.the capacitors should be mounted close to the lt6654. the gnd and v out traces should be as short as possible to minimize i ? r drops , since high trace resistance directly impacts load regulation.ir reflow shift the different expansion and contraction rates of the ma- terials that make up the lt6654 package may cause the output voltage to shift after undergoing ir reflow . lead free solder reflow profiles reach over 250 c, considerably more than with lead based solder . a typical lead free ir reflow profile is shown in figure 12 . similar profiles are found using a convection reflow oven . lt6654 devices run up to three times through this reflow process show that the standard deviation of the output voltage increases with a slight negative mean shift of 0 . 003 % as shown in figure 13 . while there can be up to 0 .014% of output voltage shift , the overall drift of the lt6654 after ir reflow does not vary significantly. figure 12. lead free reflow profile minutes temperature (c) 0 0 75 rampdown t p 30s 40s t l 130s 120s 150 225 300 2 4 6 8 6654 f12 10 ramp to150c 380s t p = 260c t l = 217c t s(max) = 200c t s = 190c t = 150c figure 13. output voltage shift due to ir reflow (%) change in output (ppm) ?140 0 number of units 2 4 6 8 10 12 14 ?120 ?100 ?80 ?60 6654 f13 ?40 0 ?20 260c 3 cycles260c 1 cycle lt6654s6 humidity sensitivityplastic mould compounds absorb water . with changes in relative humidity , plastic packaging materials change the amount of pressure they apply to the die inside , which can cause slight changes in the output of a volt - age reference , usually on the order of 100ppm . the l s8 package is hermetic , so it is not affected by humidity , and is therefore more stable in environments where humidity may be a concern. downloaded from: http:///
lt6654 18 6654ff for more information www.linear.com/lt6654 lt6654-2.5 2n2905 220 in out 4.7f 6654 ta03 1f i out up to 300ma 4.5v < v in < 36v gnd boosted output current reference extended supply range reference boosted output current with current limit 12 led 1* * led cannot be ommitted the led clamps the voltage drop across the 220 and limits output current 6654 ta04 220 4.7f 1f i out up to 100ma 102n2905 4.5v < v in < 36v lt6654-2.5 in out gnd octal dac reference typical applications lt6654-2.5 bzx84c12 330k up to 160v mmbt5551 6654 ta02 1f 0.1f out in gnd 2.65v < v in < 5v 6654 ta05 0.1f 10f v ref v cc cs dac e dac adac b dac c dac d dac f dac g gnd dac h ltc2600 sck sdi clear v in 0.1f lt6654-2.5 in out gnd downloaded from: http:///
lt6654 19 6654ff for more information www.linear.com/lt6654 package description 1.50 C 1.75 (note 4) 2.80 bsc 0.30 C 0.45 6 plcs (note 3) datum a 0.09 C 0.20 (note 3) s6 tsot-23 0302 2.90 bsc (note 4) 0.95 bsc 1.90 bsc 0.80 C 0.90 1.00 max 0.01 C 0.10 0.20 bsc 0.30 C 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 s6 package 6-lead plastic tsot-23 (reference ltc dwg # 05-08-1636) please refer to http:// www .linear.com/product/lt6654#packaging for the most recent package drawings. downloaded from: http:///
lt6654 20 6654ff for more information www.linear.com/lt6654 package description 7 8 13 4 2 2.00 ref r0.20 ref 65 7 8 65 12 3 4 4.20 0.10 4.20 sq 0.10 2.54 0.15 1.00 7 typ 0.64 8 typ ls8 0113 rev b r0.20 ref 0.95 0.10 1.45 0.10 0.10 typ 0.70 typ 1 4 7 8 6 1.4 0.5 1.50 0.15 2.50 0.15 2.54 0.15 0.70 0.05 8 package outline 0.5 5.00 sq 0.15 5.00 sq 0.15 5.00 sq 0.15 5.80 sq 0.15 apply solder mask to areas that are not soldered note:1. all dimensions are in millimeters 2. drawing not to scale 3. dimensions package do not include plating burrs plating burrs, if present, shall not exceed 0.30mm on any side 4. platingelecto nickel min 1.25um, electro gold min 0.30um 5. shaded area is only a reference for pin 1 location on the top and bottom of package pin 1top mark (see note 5) 2 3 ls8 package 8-pin leadless chip carrier (5mm 5mm) (reference ltc dwg # 05-08-1852 rev b) abcdef xyy zz e4 q12345 tray pin 1 bevel package in tray loading orientation component pin a1 1.4 please refer to http:// www .linear.com/product/lt6654#packaging for the most recent package drawings. downloaded from: http:///
lt6654 21 6654ff for more information www.linear.com/lt6654 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 12/10 added voltage options (1.250v, 2.048v, 3.000v, 4.096v, 5.000v) reflected throughout the data sheet. 1-18 b 3/11 revised conditions for output voltage noise in the electrical characteristics section. 4 c 8/12 addition of ls8 features and order information. update to electrical characteristics to include ls8 package. addition of long term drift and hysteresis plots for ls8 package. addition of humidity sensitivity information. addition of ls8 package description. addition of related parts. 1, 2, 4 6 9, 15, 16 1720 22 d 2/14 schematics updated to refer to pin functions instead of pin numbers. label of pin 2 on ls8 package changed to nc.the pin descriptions of pin 2, pin 3 and pin 4 on ls8 package changed. gnd label added on all schematic references of lt6654. 1, 13, 14, 18 2, 11, 12 11 18, 22 e 6/15 sot-23 removed from data sheet title. order information updated to include 2.048v, 4.096v and 5v option in ls8 package. 1 3, 4 f 12/15 part marking correction for 4.096v options in tsot-23 package. web link to package description updated. 3 19, 20 downloaded from: http:///
lt6654 22 6654ff for more information www.linear.com/lt6654 ? linear technology corporation 2010 lt 1215 rev f ? printed in usa linear technology corporation 1630 mccarthy blvd., milpitas, ca 95035-7417 (408) 432-1900 fax : (408) 434-0507 www.linear.com/lt6654 related parts typical application part number description comments lt1460 micropower series reference 0.075% max, 10ppm/c max drift, 2.5v, 5v and 10v versions, msop, pdip, s0-8, sot-23 and to-92 packages lt1461 micropower precision ldo series reference 3ppm/c max drift, 0c to 70c, C40c to 85c, C40c to 125c options in so-8 lt1790 micropower precision series references 0.05% max, 10ppm/c max, 60a supply, sot-23 package lt6650 micropower reference with buffer amplifier 0.05% max, 5.6a supply, sot-23 package ltc6652 precision low drift low noise buffered reference 0.5% max, 5ppm/c max, 2.1ppm p-p noise (0.1hz to 10hz) 100% tested at C40c, 25c and 125c lt6660 tiny micropower series reference 0.2% max, 20ppm/c max, 20ma output current, 2mm 2mm dfn ltc6655 precision low noise reference 2ppm/c max, 650nv p-p noise (0.1hz to 10hz) 100% tested at C40c, 25c and 125c lt6656 800na precision voltage reference 800na, 10ppm/c max, 0.05% max, sot-23 package 16-bit adc reference 6654 ta06 sdo sdi f o gnd sck cs in+ inC +C v cc v ref 4.6v < v s < 36v lt6654-4.096 ltc2480 to mcu C2.048v < v differential < 2.048v in out 0.1f 10f gnd downloaded from: http:///

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