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lt1460 1 1460fc description features app lications typical application output voltage error (%) ?0.10 units (%) ?0.06 ?0.02 0 1460 ta02 0.06 0.02 2018 16 14 12 10 86 4 2 0 0.10 1400 partsfrom 2 runs micropower precision series reference family the lt ? 1460 is a micropower bandgap reference that combines very high accuracy and low drift with low power dissipation and small package size. this series reference uses curvature compensation to obtain low temperature coefficient and trimmed precision thin-film resistors to achieve high output accuracy. the reference will supply up to 20ma with excellent line regulation characteristics, making it ideal for precision regulator applications. this series reference provides supply current and power dissipation advantages over shunt references that m ust idle the entire load current to operate. additionally, the lt1460 does not require an output compensation capacitor, yet is stable with capacitive loads. this feature is important where pc board space is a premium or fast settling is demanded. in the event of a reverse battery connection, these references will not conduct current, and are therefore protected from damage. the lt1460 is available in the 8-lead msop, so, pdip and the 3-lead to-92 and sot23 packages. l , lt, ltc, ltm, linear technology and the linear logo are registered trademarks of linear technology corporation. all other trademarks are the property of their respective owners. n handheld instruments n precision regulators n a/d and d/a converters n power supplies n hard disk drives n trimmed to high accuracy: 0.075% max n low drift: 10ppm/c max n industrial temperature range n temperature coefficient guaranteed to 125c n low supply current: 130a max (lt1460-2.5) n minimum output current: 20ma n no output capacitor required n reverse battery protection n minimum input/output differential: 0.9v n available in s0-8, msop-8, pdip-8, to-92 and sot- 23 package basic connection typical distribution of output voltage s8 package lt1460-2.5 gnd in out 1460 ta01 c10.1f 2.5v 3.4v to 20v downloaded from: http:///
lt1460 2 1460fc input voltage .............................................................30v reverse voltage ...................................................... ?15v output short-circuit duration, t a = 25c v in > 10v ............................................................5 sec v in 10v ..................................................... indefinite (note 1) specified temperature range (note 10) commercial (c) ........................................ 0c to 70c in dustrial (i) .........................................?40c to 85c hi gh (h) ............................................. ?40c to 125c storage temperature range (note 2) ..... ?65c to 150c lead temperature (soldering, 10 sec)................... 300c absolute maximum ratings 3 gnd in 1 top view s3 package 3-lead plastic sot-23 out 2 t jmax = 125c, ja = 228c/w 12 3 4 87 6 5 top view dnc* v in dnc* gnd dnc*dnc* v out dnc* n8 package 8-lead plastic dip *connected internally. do not connect external circuitry to these pins t jmax = 150c, ja = 130c/w 12 3 4 87 6 5 top view dnc*dnc* v out dnc* dnc* v in dnc* gnd s8 package 8-lead plastic so *connected internally. do not connect external circuitry to these pins t jmax = 150c, ja = 190c/w 12 3 4 dnc* v in dnc* gnd 87 6 5 dnc*dnc* v out dnc* top view ms8 package 8-lead plastic msop *connected internally. do not connect external circuitry to these pins t jmax = 150c, ja = 250c/w 3 2 1 bottom view v in v out gnd z package 3-lead to-92 plastic t jmax = 150c, ja = 160c/w pin configuration downloaded from: http:///
lt1460 3 1460fc order information lead free finish tape and reel part marking package description specified temperature range lt1460acn8-2.5#pbf lt1460acn8-2.5#trpbf 8-lead plastic dip 0c to 70c lt1460bin8-2.5#pbf lt1460bin8-2.5#trpbf 8-lead plastic dip ?40c to 85c lt1460dcn8-2.5#pbf lt1460dcn8-2.5#trpbf 8-lead plastic dip 0c to 70c lt1460ein8-2.5#pbf lt1460ein8-2.5#trpbf 8-lead plastic dip ?40c to 85c lt1460acn8-5#pbf lt1460acn8-5#trpbf 8-lead plastic dip 0c to 70c lt1460bin8-5#pbf lt1460bin8-5#trpbf 8-lead plastic dip ?40c to 85c lt1460dcn8-5#pbf lt1460dcn8-5#trpbf 8-lead plastic dip 0c to 70c lt1460ein8-5#pbf lt1460ein8-5#trpbf 8-lead plastic dip ?40c to 85c lt1460acn8-10#pbf lt1460acn8-10#trpbf 8-lead plastic dip 0c to 70c lt1460bin8-10#pbf lt1460bin8-10#trpbf 8-lead plastic dip ?40c to 85c lt1460dcn8-10#pbf lt1460dcn8-10#trpbf 8-lead plastic dip 0c to 70c lt1460ein8-10#pbf lt1460ein8-10#trpbf 8-lead plastic dip ?40c to 85c lt1460acs8-2.5#pbf lt1460acs8-2.5#trpbf 1460a2 8-lead plastic so 0c to 70c lt1460bis8-2.5#pbf lt1460bis8-2.5#trpbf 460bi2 8-lead plastic so ?40c to 85c lt1460dcs8-2.5#pbf lt1460dcs8-2.5#trpbf 1460d2 8-lead plastic so 0c to 70c lt1460eis8-2.5#pbf lt1460eis8-2.5#trpbf 460ei2 8-lead plastic so ?40c to 85c lt1460lhs8-2.5#pbf lt1460lhs8-2.5#trpbf 60lh25 8-lead plastic so 0c to 70c lt1460mhs8-2.5#pbf lt1460mhs8-2.5#trpbf 60mh25 8-lead plastic so ?40c to 85c lt1460acs8-5#pbf lt1460acs8-5#trpbf 1460a5 8-lead plastic so 0c to 70c lt1460bis8-5#pbf lt1460bis8-5#trpbf 460bi5 8-lead plastic so ?40c to 85c lead free finish tape and reel (mini) tape and reel part marking* package description specified temperature range lt1460hcs3-2.5#trmpbf lt1460hcs3-2.5#trmpbf ltac or lth8 ? 3-lead plastic sot-23 0c to 70c lt1460jcs3-2.5#trmpbf lt1460jcs3-2.5#trpbf ltad or lth8 ? 3-lead plastic sot-23 0c to 70c lt1460kcs3-2.5#trmpbf lt1460kcs3-2.5#trpbf ltae or lth8 ? 3-lead plastic sot-23 0c to 70c lt1460hcs3-3#trmpbf lt1460hcs3-3#trpbf ltan or lth9 ? 3-lead plastic sot-23 0c to 70c lt1460jcs3-3#trmpbf lt1460jcs3-3#trpbf ltap or lth9 ? 3-lead plastic sot-23 0c to 70c lt1460kcs3-3#trmpbf lt1460kcs3-3#trpbf ltaq or lth9 ? 3-lead plastic sot-23 0c to 70c lt1460hcs3-3.3#trmpbf lt1460hcs3-3.3#trpbf ltar or ltj1 ? 3-lead plastic sot-23 0c to 70c lt1460jcs3-3.3#trmpbf lt1460jcs3-3.3#trpbf ltas or ltj1 ? 3-lead plastic sot-23 0c to 70c lt1460kcs3-3.3#trmpbf lt1460kcs3-3.3#trpbf ltat or ltj1 ? 3-lead plastic sot-23 0c to 70c lt1460hcs3-5#trmpbf lt1460hcs3-5#trpbf ltak or ltj2 ? 3-lead plastic sot-23 0c to 70c lt1460jcs3-5#trmpbf lt1460jcs3-5#trpbf ltal or ltj2 ? 3-lead plastic sot-23 0c to 70c lt1460kcs3-5#trmpbf lt1460kcs3-5#trpbf ltam or ltj2 ? 3-lead plastic sot-23 0c to 70c lt1460hcs3-10#trmpbf lt1460hcs3-10#trpbf ltau or ltj3 ? 3-lead plastic sot-23 0c to 70c lt1460jcs3-10#trmpbf lt1460jcs3-10#trpbf ltav or ltj3 ? 3-lead plastic sot-23 0c to 70c lt1460kcs3-10#trmpbf lt1460kcs3-10#trpbf ltaw or ltj3 ? 3-lead plastic sot-23 0c to 70c trm = 500 pieces. *temperature grades and parametric grades are identified by a label on the shipping container. ? product grades are identified with either part marking. consult ltc marketing for parts specified with wider operating temperature ranges. consult ltc marketing for information on lead based finish parts. 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/ downloaded from: http:///
lt1460 4 1460fc temperature accuracy (%) temperature coefficient (ppm/c) package type n8 s8 ms8 z s3 0c to 70c 0.075 10 lt1460acn8 lt1460acs8 ?40c to 85c 0.10 10 lt1460bin8 lt1460bis8 0c to 70c 0.10 15 lt1460ccms8 0c to 70c 0.10 20 lt1460dcn8 lt1460dcs8 ?40c to 85c 0.125 20 lt1460ein8 lt1460eis8 0c to 70c 0.15 25 lt1460fcms8 0c to 70c 0.25 25 lt1460gcz ?40c to 85c 0.25 25 lt1460giz ?40c to 85c/125c 0.20 20/50 lt1460lhs8 ?40c to 125c 0.20 50 lt1460mhs8 0c to 70c 0.20 20 lt1460hcs3 0c to 70c 0.40 20 lt1460jcs3 0c to 70c 0.50 50 lt1460kcs3 available options lead free finish tape and reel part marking package description specified temperature range lt1460dcs8-5#pbf lt1460dcs8-5#trpbf 1460d5 8-lead plastic so 0c to 70c lt1460eis8-5#pbf lt1460eis8-5#trpbf 460ei5 8-lead plastic so ?40c to 85c lt1460lhs8-5#pbf lt1460lhs8-5#trpbf 460lh5 8-lead plastic so 0c to 70c lt1460mhs8-5#pbf lt1460mhs8-5#trpbf 460mh5 8-lead plastic so ?40c to 85c lt1460acs8-10#pbf lt1460acs8-10#trpbf 1460a1 8-lead plastic so 0c to 70c lt1460bis8-10#pbf lt1460bis8-10#trpbf 460bi1 8-lead plastic so ?40c to 85c lt1460dcs8-10#pbf lt1460dcs8-10#trpbf 1460d1 8-lead plastic so 0c to 70c lt1460eis8-10#pbf lt1460eis8-10#trpbf 460ei1 8-lead plastic so ?40c to 85c lt1460ccms8-2.5#pbf lt1460ccms8-2.5#trpbf ltaa 8-lead plastic msop 0c to 70c lt1460fcms8-2.5#pbf lt1460fcms8-2.5#trpbf ltab 8-lead plastic msop 0c to 70c lt1460ccms8-5#pbf lt1460ccms8-5#trpbf ltaf 8-lead plastic msop 0c to 70c lt1460fcms8-5#pbf lt1460fcms8-5#trpbf ltag 8-lead plastic msop 0c to 70c lt1460ccms8-10#pbf lt1460ccms8-10#trpbf ltah 8-lead plastic msop 0c to 70c lt1460fcms8-10#pbf lt1460fcms8-10#trpbf ltaj 8-lead plastic msop 0c to 70c lt1460gcz-2.5#pbf lt1460gcz-2.5#trpbf 3-lead plastic to-92 0c to 70c lt1460giz-2.5#pbf lt1460giz-2.5#trpbf 3-lead plastic to-92 ?40c to 85c lt1460gcz-5#pbf lt1460gcz-5#trpbf 3-lead plastic to-92 0c to 70c lt1460giz-5#pbf lt1460giz-5#trpbf 3-lead plastic to-92 ?40c to 85c lt1460gcz-10#pbf lt1460gcz-10#trpbf 3-lead plastic to-92 0c to 70c lt1460giz-10#pbf lt1460giz-10#trpbf 3-lead plastic to-92 ?40c to 85c consult ltc marketing for parts specified with wider operating temperature ranges. consult ltc marketing for information on non-standard lead based finish parts. 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/ order information downloaded from: http:///
lt1460 5 1460fc parameter conditions min typ max units output voltage lt1460acn8-2.5, acs8-2.5 2.49813 ?0.075 2.50188 0.075 v % lt1460bin8-2.5, bis8-2.5, ccms8-2.5, dcn8-2.5, dcs8-2.5 2.4975 ?0.10 2.5025 0.10 v % lt1460ein8-2.5, eis8-2.5 2.49688 ?0.125 2.50313 0.125 v % lt1460fcms8-2.5 2.49625 ?0.15 2.50375 0.15 v % lt1460gcz-2.5, giz-2.5 2.49375 ?0.25 2.50625 0.25 v % lt1460lhs8-2.5, mhs8-2.5 2.495 ?0.20 2.505 0.20 v % lt1460acn8-5, acs8-5 4.99625 ?0.075 5.00375 0.075 v % lt1460bin8-5, bis8-5, ccms8-5, dcn8-5, dcs8-5 4.995 ?0.10 5.005 0.10 v % lt1460ein8-5, eis8-5 4.99375 ?0.125 5.00625 0.125 v % lt1460fcms8-5 4.9925 ?0.15 5.0075 0.15 v % lt1460gcz-5, giz-5 4.9875 ?0.25 5.0125 0.25 v % lt1460lhs8-5, mhs8-5 4.990 ?0.20 5.010 0.20 v % lt1460acn8-10, acs8-10 9.9925 ?0.075 10.0075 0.075 v % lt1460bin8-10, bis8-10, ccms8-10, dcn8-10, dcs8-10 9.990 ?0.10 10.010 0.10 v % lt1460ein8-10, eis8-10 9.9875 ?0.125 10.0125 0.125 v % lt1460fcms8-10 9.985 ?0.15 10.0015 0.15 v % lt1460gcz-10, giz-10 9.975 ?0.25 10.025 0.25 v % lt1460hc lt1460jc lt1460kc ?0.2 ?0.4 ?0.5 0.2 0.4 0.5 % % % output voltage temperature coefficient (note 3) t min t j t max lt1460acn8, acs8, bin8, bis8 lt1460ccms8 lt1460dcn8, dcs8, ein8, eis8 lt1460fcms8, gcz, giz lt1460lhs8 ?40c to 85c ?40c to 125c lt1460mhs8 ?40c to 125c l l l l l l l 5 7 10 12 10 25 25 10 15 20 25 20 50 50 ppm/c ppm/c ppm/c ppm/c ppm/c ppm/c ppm/c lt1460hc lt1460jc lt1460kc l l l 10 10 25 20 20 50 ppm/c ppm/c ppm/c the l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at t a = 25c. v in = v out + 2.5v, i out = 0 unless otherwise specified. electrical characteristics downloaded from: http:///
lt1460 6 1460fc the l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at t a = 25c. v in = v out + 2.5v, i out = 0 unless otherwise specified. parameter conditions min typ max units line regulation lt1460a, lt1460b, lt1460c, lt1460d, lt1460e, lt1460f, lt1460g, lt1460h, lt1460l, lt1460m v out + 0.9v v in v out + 2.5v l 30 60 80 ppm/v ppm/v v out + 2.5v v in 20v l 10 25 35 ppm/v ppm/v lt1460hc, l t1460jc, lt1460kc v out + 0.9v v in v out + 2.5v l 150 800 1000 ppm/v ppm/v v out + 2.5v v in 20v l 50 100 130 ppm/v ppm/v load regulation sourcing (note 4) lt1460a, lt1460b, lt1460c, lt1460d, lt1460e, lt1460f, lt1460g, lt1460h, lt1460l, lt1460m i out = 100a l 1500 2800 3500 ppm/ma ppm/ma i out = 10ma l 80 135 180 ppm/ma ppm/ma i out = 20ma 0c to 70c l 70 100 140 ppm/ma ppm/ma lt1460hc, l t1460jc, lt1460kc i out = 100a l 1000 3000 4000 ppm/ma ppm/ma i out = 10ma l 50 200 300 ppm/ma ppm/ma i out = 20ma l 20 70 100 ppm/ma ppm/ma thermal regulation (note 5) lt1460a, lt1460b, lt1460c, lt1460d, lt1460e, lt1460f, lt1460g, lt1460h, lt1460l, lt1460m p = 200mw 0.5 2.5 ppm/mw lt1460hc, lt1460jc, lt1460kc p = 200mw 2.5 10 ppm/mw dropout voltage (note 6) v in ? v out , i out = 0 l 0.9 v v in ? v out , i out = 10ma l 1.3 1.4 v v output current short v out to gnd 40 ma reverse leakage v in = ?15v l 0.5 10 a supply current lt1460-2.5 l 100 130 165 a a lt1460-5 l 125 175 225 a a lt1460-10 l 190 270 360 a a lt1460s3-2.5 l 115 145 175 a a lt1460s3-3 l 145 180 220 a a lt1460s3-3.3 l 145 180 220 a a lt1460s3-5 l 160 200 240 a a lt1460s3-10 l 215 270 350 a a electrical characteristics downloaded from: http:///
lt1460 7 1460fc parameter conditions min typ max units output voltage noise (note 7) lt1460a, lt1460b, lt1460c, lt1460d, lt1460e, lt1460f, lt1460g, lt1460h, lt1460l, lt1460m lt1460-2.5 0.1hz f 10hz 10hz f 1khz 10 10 v p-p v rms lt1460-5 0.1hz f 10hz 10hz f 1khz 20 20 v p-p v rms lt1460-10 0.1hz f 10hz 10hz f 1khz 40 35 v p-p v rms lt1460hc, lt1460jc, lt1460kc 0.1hz f 10hz 10hz f 1khz 4 4 ppm (p-p) ppm (rms) long-term stability of output voltage (note 8) s8 pkg 40 ppm/ khr lt1460hc, lt1460jc, lt1460kc 100 ppm/ khr hysteresis (note 9) lt1460a, lt1460b, lt1460c, lt1460d, lt1460e, lt1460f, lt1460g, lt1460h, lt1460l, lt1460m t = 0c to 70c ? t = ?40c to 85c 25 160 ppm ppm lt1460hc, lt1460jc, lt1460kc t = 0c to 70c t = ?40c to 85c l l 50 250 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: if the part is stored outside of the specified temperature range, the output may shift due to hysteresis.note 3: temperature coefficient is measured by dividing the change in output voltage by the specified temperature range. incremental slope is also measured at 25c. 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: thermal regulation is caused by die temperature gradients created by load current or input voltage changes. this effect must be added to normal line or load regulation. this parameter is not 100% tested. note 6: excludes load regulation errors. for lt1460s3, v out 0.2%. for all other packages, v out 0.1%. note 7: peak-to-peak noise is measured with a single 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 sec. rms noise is measured with a single highpass filter at 10hz and a 2-pole lowpass filter at 1khz. the resulting output is full wave rectified the l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at t a = 25c. v in = v out + 2.5v, i out = 0 unless otherwise specified. and then integrated for a fixed period, making the final reading an average as opposed to rms. a correction factor of 1.1 is used to convert from average to rms and a second correction of 0.88 is used to correct for the nonideal pass band of the filters. note 8: 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. significant improvement in long-term drift can be realized by preconditioning the ic with a 100 hour to 200 hour, 125c burn-in. long-term stability will also be affected by differential stresses between the ic and the board material created during board assembly. see pc board layout in the applications information section. note 9: 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 85c or ?40c before successive measurements. hysteresis is roughly proportional to the square of the temperature change. for instruments that are stored at reasonably well-controlled temperatures (within 20 or 30 degrees of operating temperature) hysteresis is generally not a problem. note 10: the lt1460s3 is guaranteed functional over the operating temperature range of ?40 to 85c. electrical characteristics downloaded from: http:///
lt1460 8 1460fc i out = 10ma load capacitance (f) 10 1 0.1 0 1460 g09 input voltage (v) 0 175150 125 100 7550 25 0 15 1460 g05 5 10 20 supply current (a) 125c 25c ?55c temperature (c) ?50 output voltage (v) 2.5032.502 2.501 2.500 2.499 2.498 ?25 0 25 50 1460 g04 75 100 3 typical parts output current (ma) 0 0.5 output voltage change (mv) 1.0 1.5 1460 g03 8070 60 50 40 30 20 10 0 ?55c 125c 25c output current (ma) 0.1 output voltage change (mv) 65 4 3 2 1 0 1 10 100 1460 g02 125c 25c ?55c input-output voltage (v) 0 output current (ma) 100 10 1 0.1 1.0 0.5 1.5 2.0 2.5 1460 g01 125c ?55c 25c input voltage (v) 0 output voltage (v) 4 8 10 20 1460 g06 2 6 12 14 16 18 2.50142.5010 2.5006 2.5002 2.4998 2.4994 2.4990 125c 25c ?55c frequency (hz) power supply rejection ratio (db) 9080 70 60 50 40 30 20 10 0 ?10 100 10k 100k 1m 1460 g07 1k frequency (hz) 10 output impedance () 1k 100 10 1 1k 100 10k 100k 1m 1460 g08 c l = 0 c l = 0.1f c l = 1f 2.5v minimum input-output voltage differential 2.5v load regulation, sourcing 2.5v load regulation, sinking 2.5v output voltage temperature drift 2.5v supply current vs input voltage 2.5v line regulation 2.5v power supply rejection ratio vs frequency 2.5v output impedance vs frequency 2.5v transient responses lt1460-2.5 (n8, s8, ms8, z packages) typical performance characteristics downloaded from: http:///
lt1460 9 1460fc temperature (c) ?50 output voltage (v) 5.0045.002 5.000 4.998 4.996 4.994 ?25 0 25 50 1460 g16 75 100 3 typical parts input voltage (v) 0 200180 160 140 120 100 8060 40 20 0 1460 g17 16 4 2 6 10 8 12 14 18 20 supply current (a) 125c ?55c 25c input voltage (v) 0 output voltage (v) 4 8 10 20 1460 g18 2 6 12 14 16 18 5.0025.000 4.998 4.996 4.994 4.992 125c 25c ?55c input-output voltage (v) 0 output current (ma) 100 10 1 0.1 1.0 0.5 1.5 2.0 2.5 1460 g13 125c ?55c 25c output current (ma) 0.1 output voltage change (mv) 65 4 3 2 1 0 1 10 100 1460 g14 125c 25c ?55c frequency (hz) 100 1000 10 1k 10k 1460 g10 100 100k noise voltage (nv/ hz ) time (sec) 0 1 2 3 4 5 6 7 8 9 10 output noise (10v/div) 1460 g11 time (hours) 0 output voltage (v) 2.50002.4998 2.4996 2.4994 2.4992 2.4990 800 1460 g12 200 400 600 1000 2.5v output voltage noise spectrum 2.5v output noise 0.1hz to 10hz 2.5v long-term drift three typical parts (s8 package) 5v minimum input-output voltage differential 5v load regulation, sourcing 5v load regulation, sinking 5v output voltage temperature drift 5v supply current vs input voltage 5v line regulation output current (ma) 0 1 2 output voltage change (mv) 3 4 5 1460 g15 100 9080 70 60 50 40 30 20 10 0 25c C55c 125c lt1460-5 (n8, s8, ms8, z packages) typical performance characteristics downloaded from: http:///
lt1460 10 1460fc output current (ma) 0.1 4 output voltage change (mv) 5 6 7 8 1 10 100 1460 g25 3 21 0 9 10 C55c 25c 125c input/output voltage (v) 0 0.1 output current (ma) 100 0.5 1.0 1.5 2.0 2.5 1460 g24 10 1 C55c 125c 25c output current (ma) 0 output voltage change (mv) 60 80 100 4 1460 g26 4020 50 70 9030 10 0 1 2 3 5 C55c 125c 25c frequency (hz) power supply rejection ratio (db) 9080 70 60 50 40 30 20 10 0 100 10k 100k 1m 1460 g19 1k frequency (hz) 10 output impedance () 1k 100 10 1 0.1 1k 100 10k 100k 1m 1460 g20 c l = 0 c l = 0.1f c l = 1f i out = 10ma 0.2ms/div load capacitance (f) 10 1 0.1 0 1460 g21 frequency (hz) 100 1000 2000 3000 10 1k 10k 1460 g22 100 100k noise voltage (nv/ hz ) time (sec) 0 1 2 3 4 5 6 7 8 9 10 output noise (10v/div) 1460 g23 5v power supply rejection ratio vs frequency 5v output impedance vs frequency 5v transient responses 5v output voltage noise spectrum 5v output noise 0.1hz to 10hz 10v minimum input/output voltage differential 10v load regulation, sourcing 10v load regulation, sinking lt1460-10 (n8, s8, ms8, z packages) lt1460-5 (n8, s8, ms8, z packages) typical performance characteristics downloaded from: http:///
lt1460 11 1460fc frequency (khz) 0.01 0.1 1 10 1 10 0.1 100 1460 g33 noise voltage (v/ hz ) time (sec) 0 output noise (50v/div) 8 1460 g34 2 4 6 10 12 14 input frequency (khz) 20 power supply rejection ratio (db) 40 6050 80 100 10 30 70 90 0.1 10 100 1000 1460 g30 0 1 frequency (khz) 1 output impedance () 10 100 1000 0.01 1 10 100 0.1 0.1 1000 1460 g31 c l = 0f c l = 1f c l = 0.1f i out = 10ma 200s/div load capacitance (f) 10 1 0.1 0 1460 g32 temperature (c) C50 9.982 output voltage (v) 9.986 9.990 9.994 9.998 10.006 C25 0 25 50 1460 g27 75 100 10.002 3 typical parts input voltage (v) 0 supply current (a) 240 320 400 16 1460 g28 160 80 200 280 360120 40 0 4 8 12 2 18 6 10 14 20 C55c 125c 25c input voltage (v) 6 9.980 output voltage (v) 9.984 9.988 9.992 9.996 10.004 10 14 18 1460 g29 8 12 16 20 10.000 C55c 125c 25c 10v output voltage temperature drift 10v supply current vs input voltage 10v line regulation 10v power supply rejection ratio vs frequency 10v output impedance vs frequency 10v transient responses 10v output voltage noise spectrum 10v output noise 0.1hz to 10hz typical performance characteristics downloaded from: http:///
lt1460 12 1460fc temperature (c) C50 output voltage (v) 2.501 2.502 2.503 25 75 1460 g38 2.500 2.499 C25 0 50 100 125 2.498 2.497 three typical parts input voltage (v) 0 supply current (a) 100 150 125c 25c C55c 20 1460 g39 50 0 5 10 15 250200 input voltage (v) 0 output voltage (v) 2.5022.501 2.500 2.499 2.498 2.497 2.496 2.495 2.494 16 1460 g40 4 8 12 20 14 2 6 10 18 25c 125c C55c input-output voltage (v) 0 0.1 output current (ma) 10 125c 25c 100 0.5 1.0 1.5 2.0 2.5 1460 g35 1 C55c output current (ma) 0.1 C2.0 output voltage change (mv) C1.0 0 1 10 100 1460 g36 C3.0 C2.5 C1.5 C0.5 C3.5C4.0 C55c 25c 125c output current (ma) 0 0 output voltage change (mv) 20 40 60 80 100 120 1 2 3 4 C55c 1460 g37 5 125c 25c frequency (khz) 20 power supply rejection ratio (db) 40 50 70 80 0.1 10 100 1000 1460 g41 0 1 6030 10 frequency (khz) 1 output impedance () 10 100 1000 0.01 1 10 100 0.1 0.1 1000 1460 g42 c l = 0f c l = 0.1f c l = 1f c load = 0f 200s/div load current (ma) 10 20 1 0.1 1460 g43 characteristic curves are similar for all voltage options of the lt1460s3. curves from the lt1460s3-2.5 and the lt1460s3-10 represent the extremes of the voltage options. characteristic curves for other output voltages fall between these curves, and can be estimated based on their voltage output. lt1460s3-2.5v minimum input- output voltage differential lt1460s3-2.5v load regulation, sourcing lt1460s3-2.5v load regulation, sinking lt1460s3-2.5v output voltage temperature drift lt1460s3-2.5v supply current vs input voltage lt1460s3-2.5v line regulation lt1460s3-2.5v power supply rejection ratio vs frequency lt1460s3-2.5v output impedance vs frequency lt1460s3-2.5v transient response typical performance characteristics downloaded from: http:///
lt1460 13 1460fc output current (ma) 0.1 15 output voltage change (mv) 20 25 30 35 1 10 100 1460 g47 10 5 C5 C10 0 125c 25c C55c output current (ma) 0 output voltage change (mv) 150 200 250 4 1460 g48 100 50 0 1 2 3 5 125c C55c 25c temperature (c) C50 output voltage (v) 10.002 10.004 10.006 0 50 75 1460 g49 9.998 10.000 9.9969.994 9.992 9.990 9.988 9.986 9.984 9.982 C25 25 100 125 three typical parts frequency (hz) 100 1000 10 1k 10k 1460 g44 100 100k noise voltage (nv/ hz ) time (2 sec/div) output noise (20v/div) 1460 g45 input-output voltage (v) 0 0.1 output current (ma) 10 125c 25c 100 0.5 1.0 1.5 2.0 2.5 1460 g46 1 C55c input voltage (v) 0 0 supply current (a) 50 150 200 250 350 2 10 14 1460 g50 100 300 8 18 20 4 6 12 16 125c C55c 25c input voltage (v) 6 output voltage (v) 10.000 10.005 10.010 12 16 1460 g51 9.995 9.990 8 10 14 18 20 9.985 9.980 125c C55c 25c characteristic curves are similar for all voltage options of the lt1460s3. curves from the lt1460s3-2.5 and the lt1460s3-10 represent the extremes of the voltage options. characteristic curves for other output voltages fall between these curves, and can be estimated based on their voltage output. lt1460s3-2.5v output voltage noise spectrum lt1460s3-2.5v output noise 0.1hz to 10hz lt1460s3-10v minimum input- output voltage differential lt1460s3-10v load regulation, sourcing lt1460s3-10v load regulation, sinking lt1460s3-10v output voltage temperature drift lt1460s3-10v supply current vs input voltage lt1460s3-10v line regulation typical performance characteristics downloaded from: http:///
lt1460 14 1460fc frequency (khz) 0.01 0.1 1 10 1 10 0.1 100 1460 g55 noise voltage (v/ hz ) time (2 sec/div) output noise (20v/div) 1460 g56 frequency (khz) 30 power supply rejection ratio (db) 90 100 2010 8050 7060 40 0.1 10 100 1000 1460 g52 0 1 frequency (khz) 1 output impedance () 10 100 1000 0.01 1 10 100 0.1 0.1 1000 1460 g53 c l = 0f c l = 0.1f c l = 1f c load = 0f 200s/div load current (ma) 10 20 1 0.1 1460 g54 characteristic curves are similar for all voltage options of the lt1460s3. curves from the lt1460s3-2.5 and the lt1460s3-10 represent the extremes of the voltage options. characteristic curves for other output voltages fall between these curves, and can be estimated based on their voltage output. lt1460s3-10v power supply rejection ratio vs frequency lt1460s3-10v output impedance vs frequency lt1460s3-10v transient response lt1460s3-10v output voltage noise spectrum lt1460s3-10v output noise 0.1hz to 10hz typical performance characteristics downloaded from: http:///
lt1460 15 1460fc longer battery life series references have a large advantage over older shunt style references. shunt references require a resistor from the power supply to operate. this resistor must be chosen to supply the maximum current that can ever be demanded by the circuit being regulated. when the circuit being controlled is not operating at this maximum current, the shunt reference must always sink this current, resulting in high dissipation and short battery life. the lt1460 series reference does not require a curr ent set- ting resistor and can operate with any supply volta ge from v out + 0.9v to 20v. when the circuitry being regulated does not demand current, the lt1460 reduces its dissipat ion and battery life is extended. if the reference is not d elivering load current it dissipates only a few mw, yet the same c onfigura- tion can deliver 20ma of load current when demanded . capacitive loads the lt1460 is designed to be stable with capacitive loads. with no capacitive load, the reference is ideal for fast set- tling, applications where pc board space is a premium, or where available capacitance is limited. the test circuit for the lt1460-2.5 shown in figure 1 is used to measure the response time for various load cur- rents and load capacitors. the 1v step from 2.5v to 1.5v produces a current step of 1ma or 100a for r l = 1k or r l = 10k. figure 2 shows the response of the reference with no load capacitance. the reference settles to 2.5mv (0.1%) in less than 1s for a 100a pulse and to 0.1% in 1.5s with a 1ma step. when load capacitance is greater than 0.01f, the refer- ence begins to ring due to the pole formed with the output impedance. figure 3 shows the response of the reference to a 1ma and 100a load current step with a 0.01f load capacitor. the ringing can be greatly reduced with a dc load as small as 200a. with large output capacitors, 1f, figure 5. effect of r s for c l = 1f figure 1. response time test circuit figure 2. c l = 0 figure 3. c l = 0.01f figure 4. isolation resistor test circuit lt1460-2.5 r l v out v gen 1460 f01 c in 0.1f 2.5v1.5v c l v in = 5v lt1460-2.5 r l v gen 1460 f04 c in 0.1f 2.5v1.5v c l v in = 5v v out r s 1s/div 2.5v1.5v r l = 10k r l = 1k 1460 f02 v gen v out v out 20s/div v gen v out v out 2.5v1.5v r l = 10k r l = 1k 1460 f03 0.1ms/div 2.5v1.5v r l = 1k r s = 0 r l = 1k r s = 2 1460 f05 v gen v out v out the ringing can be reduced with a small resistor in series with the reference output as shown in figure 4. figure 5 shows the response of the lt1460-2.5 with a r s = 2 and applications information downloaded from: http:///
lt1460 16 1460fc lt1460-5 r l v out v gen 1460 f06 c in 0.1f 5v4v c l v in = 5v 2s/div 5v4v r l = 10k r l = 1k 1460 f07 v gen v out v out 10s/div 5v4v r l = 10k r l = 1k 1460 f08 v gen v out v out c l = 1f. r s should not be made arbitrarily large because it will limit the load regulation. figure 6 to figure 8 illustrate response in the lt1460-5. the 1v step from 5v to 4v produces a current step of 1ma or 100a for r l = 1k or r l = 10k. figure 7 shows the response of the reference with no load capacitance. the reference settles to 5mv (0.1%) in less than 2s for a 100a pulse and to 0.1% in 3s with a 1ma step. when load capacitance is greater than 0.01f, the refere nce begins to ring due to the pole formed with the output impedance. figure 8 shows the response of the reference to a 1ma figure 6. response time test circuit figure 8. c l = 0.01f figure 7. c l = 0 and 100a load current step with a 0.01f load capacitor. figure 9 to figure 11 illustrate response of the lt1460-10. the 1v step from 10v to 9v produces a current step of 1ma or 100a for r l = 1k or r l = 10k. figure 10 shows the response of the reference with no load capacitance. the reference settles to 10mv (0.1%) in 0.4s for a 100a pulse and to 0.1% in 0.8s with a 1ma step. when load capacitance is greater than 0.01f, the reference begins to ring due to the pole formed with the output impedance. figure 11 shows the response of the reference to a 1ma and 100a load current step with a 0.01f load capacitor. figure 11. c l = 0.01f figure 10. c l = 0 figure 9. response time test circuit lt1460-10 r l v out v gen 1460 f09 c in 0.1f 10v9v c l v in = 12.5v 2s/div 10v9v r l = 10k r l = 1k 1460 f10 v gen v out v out 10s/div 10v9v r l = 10k r l = 1k 1460 f11 v gen v out v out applications information downloaded from: http:///
lt1460 17 1460fc figure 13. c l = 0f figure 14. c l = 0.1f figure 15. i out = 1ma figure 12. response time test circuit the lt1460s3 family of references are designed to be stable with a large range of capacitive loads. with no capacitive load, these references are ideal for fast settling or applications where pc board space is a premium. the test circuit shown in figure 12 is used to measure the response time and stability of various load currents and load capacitors. this circuit is set for the 2.5v option. for other voltage options, the input voltage must be scaled up and the output voltage generator offset voltage must be adjusted. the 1v step from 2.5v to 1.5v produces a current step of 10ma or 1ma for r l = 100 or r l = 1k. figure 13 shows the response of the reference to these applications information lt1460s3-2.5 r l v out v gen 1460 f12 c in 0.1f 2.5v1.5v c l v in = 2.5v 1s/div 10ma 1ma 1.5v 2.5v 1460 f13 v gen v out v out 100s/div 10ma 1ma 1.5v 2.5v 1460 f14 v gen v out v out 100s/div 4.7a 1a 1.5v 2.5v 1460 f15 v gen v out v out 1ma and 10ma load steps with no load capacitance, and figure 14 shows a 1ma and 10ma load step with a 0.1f output capacitor. figure 15 shows the response to a 1ma load step with c l = 1f and 4.7f. the frequency compensation of the lt1460s3 version is slightly different than that of the other packages. additional care must be taken when choosing load capacitance in an application circuit. table 1 gives the maximum output capacitance for vari- ous load currents and output voltages of the lt1460s3 to avoid instability. load capacitors with low esr (effective series resistance) cause more ringing than capacitors with higher esr such as polarized aluminum or tantalum capacitors. downloaded from: http:///
lt1460 18 1460fc table 1. maximum output capacitance for lt1460s3 voltage option i out = 100a i out = 1ma i out = 10ma i out = 20ma 2.5v >10f >10f 2f 0.68f 3v >10f >10f 2f 0.68f 3.3v >10f >10f 1f 0.68f 5v >10f >10f 1f 0.68f 10v >10f 1f 0.15f 0.1f long-term drift long-term drift cannot be extrapolated from acceler ated 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 lt1460s3 long-term 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 were scanned regularly and measured with an 8.5 digit dvm. figure 16 shows typical long-term drift of the lt1460s3s. hysteresis hysteresis data shown in figure 17 and figure 18 re presents the worst-case data taken on parts from 0c to 70c and from C40c to 85c. the device is capable of dissipating relatively high power, i.e., for the lt1460s3-2.5, pd = 17.5v 20ma = 350mw. the thermal resistance of the sot-23 package is 325c/w and this dissipation causes a 114c internal rise producing a junction temperature of t j = 25c + 114c = 139c. this elevated temperature will cause the output to shift due to thermal hysteresis. for highest performance in precision applications, do not let the lt1460s3?s junction temperature exceed 85c. figure 16. typical long-term drift figure 17. 0c to 70c hysteresis figure 18. ?40c to 85c hysteresis hours C150 ppm C50 50 150 C100 0 100 200 400 600 800 1460 f16 1000 100 0 300 500 700 900 hysteresis (ppm) C240 C160 C80 0 number of units 8 70c to 25c 0c to 25c 10 12 1460 f17 6 4 80 160 C200 C120 C40 40 120 200 2 0 1816 14 240 worst-case hysteresison 40 units hysteresis (ppm) C600 C400 C200 0 number of units 4 85c to 25c C40c to 25c 5 6 1460 f18 3 2 200 400 C500 C300 C100 100 300 500 1 0 98 7 600 worst-case hysteresison 34 units applications information downloaded from: http:///
lt1460 19 1460fc input capacitance it is recommended that a 0.1f or larger capacitor be added to the input pin of the lt1460. this can help with stability when large load currents are demanded. output accuracy like all references, either series or shunt, the er ror budget of the lt1460-2.5 is made up of primarily three components: initial accuracy, temperature coefficient and load regulation. line regulation is neglected because it typically contrib- utes only 30ppm/v, or 75v for a 1v input change. the lt1460-2.5 typically shifts less than 0.01% when soldered into a pcb, so this is also neglected (see pc board layout section). the output errors are calculated as follows for a 100a load and 0c to 70c temperature range: lt1460ac initial accuracy = 0.075% for i o = 100a, and using the lt1460-2.5 for calculation, v ppm ma ma v v out = ?? ? ?? ? ( )( ) = 3500 0 1 2 5 875 . . which is 0.035%.for temperature 0c to 70c the maximum t = 70c, v ppm c c v mv out = ?? ? ?? ? ( )( ) = 10 70 2 5 1 75 . . which is 0.07%. total worst-case output error is: 0.075% + 0.035% + 0.070% = 0.180%. table 1 gives worst-case accuracy for the lt1460ac, cc, dc, fc, gc from 0c to 70c and the lt1460bi, ei, gi from C40c to 85c. note that the lt1460-5 and lt1460-10 give identical ac- curacy as a fraction of their respective output voltages. pc board layout in 13- to 16-bit systems where initial accuracy and tem- perature coefficient calibrations have been done, the me- chanical and thermal stress on a pc board (in a cardcage for instance) can shift the output voltage and mask the true temperature coefficient of a reference. in addition, the mechanical stress of being soldered into a pc board can cause the output voltage to shift from its ideal value. surface mount voltage references (ms8 and s8) are the most susceptible to pc board stress because of the small amount of plastic used to hold the lead frame. a simple way to improve the stress-related shifts is to mount the reference near the short edge of the pc board, or in a corner. the board edge acts as a stress boundary, or a region where the flexure of the board is minimum. the package should always be mounted so that the leads absorb the stress and not the package. the package is generally aligned with the leads parallel to the long side of the pc board as shown in figure 20a. a qualitative technique to evaluate the effect of stress on voltage references is to solder the part into a pc board and table 2. worst-case output accuracy over temperature i out lt1460ac lt1460bi lt1460cc lt1460dc lt1460ei lt1460fc lt1460gc lt1460gi lt1460hc lt1460jc lt1460kc 0 0.145% 0.225% 0.205% 0.240% 0.375% 0.325% 0.425% 0.562% 0.340% 0.540% 0.850% 100a 0.180% 0.260% 0.240% 0.275% 0.410% 0.360% 0.460% 0.597% 0.380% 0.580% 0.890% 10ma 0.325% 0.405% 0.385% 0.420% 0.555% 0.505% 0.605% 0.742% 0.640% 0.840% 1.15% 20ma 0.425% n/a 0.485% 0.520% n/a 0.605% 0.705% n/a 0.540% 0.740% 1.05% applications information downloaded from: http:///
lt1460 20 1460fc 12 3 4 1460 f19 long dimension 2 10 0 40 30 20 flexure number 10 1460 f20a C1 output deviation (mv) flexure number 1460 f20b long dimension 2 10 0 40 30 20 10 C1 output deviation (mv) deform the board a fixed amount as shown in figure 19. the flexure #1 represents no displacement, flexure #2 is concave movement, flexure #3 is relaxation to no displace- ment and finally, flexure #4 is a convex movement. this motion is repeated for a number of cycles and the relative output deviation is noted. the result shown in figure 20a is for two lt1460s8-2.5s mounted vertically and figure 20b is for two lt1460s8-2.5s mounted horizontally. the parts oriented in figure 20a impart less stress into the package because stress is absorbed in the leads. figures 20a and 20b show the deviation to be between 125v and figure 19. flexure numbers figure 20b. two typical lt1460s8-2.5s, horizontal orientation without slots figure 20a. two typical lt1460s8-2.5s, vertical orientation without slots 250v and implies a 50ppm and 100ppm change respec- tively. this corresponds to a 13- to 14-bit system and is not a problem for most 10- to 12-bit systems unless the system has a calibration. in this case, as with temperature hysteresis, this low level can be important and even more careful techniques are required. the most effective technique to improve pc board stress is to cut slots in the board around the reference to serve as a strain relief. these slots can be cut on three sides of the reference and the leads can exit on the fourth side. this tongue of pc board material can be oriented in the long direction of the board to further reduce stress transferred to the reference. the results of slotting the pc boards of figures 20a and 20b are shown in figures 21a and 21b. in this example the slots can improve the output shift from about 100ppm to nearly zero. slot 2 10 0 40 30 20 flexure number 10 1460 f21a C1 output deviation (mv) slot 2 10 0 40 30 20 flexure number 10 1460 f21b C1 output deviation (mv) figure 21a. same two lt1460s8-2.5s in figure 16a, but with slots figure 21b. same two lt1460s8-2.5s in figure 16b, but with slots applications information downloaded from: http:///
lt1460 21 1460fc simplified schematic v cc v out gnd 1460 ss 1.20 ? 1.40 (.047 ? .060) 2.10 ? 2.64 (.083 ? .104) 2.74 1.92 0.96 bsc recommended solder pad layout 0.764 0.8 0.127 0.37 ? 0.51 (.015 ? .020) 0.09 ? 0.18 (.004 ? .007) s3 sot-23 0502 2.80 ? 3.04 (.110 ? .120) 0.89 ? 1.03 (.035 ? .041) 0.89 ? 1.12 (.035 ? .044) 0.01 ? 0.10 (.0004 ? .004) 0.45 ? 0.60 (.017 ? .024) 0.55 (.022) ref 1.78 ? 2.05 (.070 ? .081) millimeters (inches) note:1. controlling dimension: millimeters 2. dimensions are in 3. drawing not to scale 4. dimensions are inclusive of plating 5. dimensions are exclusive of mold flash and metal burr 6. mold flash shall not exceed .254mm 7. package jedec reference is to-236 variation ab package description s3 package 3-lead plastic sot-23 (reference ltc dwg # 05-08-1631) downloaded from: http:///
lt1460 22 1460fc n8 1002 .065 (1.651) typ .045 ? .065 (1.143 ? 1.651) .130 .005 (3.302 0.127) .020 (0.508) min .018 .003 (0.457 0.076) .120 (3.048) min 1 2 3 4 8 7 6 5 .255 .015* (6.477 0.381) .400* (10.160) max .008 ? .015 (0.203 ? 0.381) .300 ? .325 (7.620 ? 8.255) .325 +.035?.015 +0.889 ?0.381 8.255 ( ) note:1. dimensions are inches millimeters *these dimensions do not include mold flash or protrusions. mold flash or protrusions shall not exceed .010 inch (0.254mm) .100 (2.54) bsc .016 ? .050 (0.406 ? 1.270) .010 ? .020 (0.254 ? 0.508) 45 0 ? 8 typ .008 ? .010 (0.203 ? 0.254) so8 0303 .053 ? .069 (1.346 ? 1.752) .014 ? .019 (0.355 ? 0.483) typ .004 ? .010 (0.101 ? 0.254) .050 (1.270) bsc 1 2 3 4 .150 ? .157 (3.810 ? 3.988) note 3 8 7 6 5 .189 ? .197 (4.801 ? 5.004) note 3 .228 ? .244 (5.791 ? 6.197) .245 min .160 .005 recommended solder pad layout .045 .005 .050 bsc .030 .005 typ inches (millimeters) note:1. dimensions in 2. drawing not to scale3. these dimensions do not include mold flash or protrusions. mold flash or protrusions shall not exceed .006" (0.15mm) package description n8 package 8-lead pdip (narrow .300 inch) (reference ltc dwg # 05-08-1510) s8 package 8-lead plastic small outline (narrow .150 inch) (reference ltc dwg # 05-08-1610) downloaded from: http:///
lt1460 23 1460fc msop (ms8) 0307 rev f 0.53 0.152 (.021 .006) seating plane 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 0.18 (.007) 0.254 (.010) 1.10 (.043) max 0.22 ? 0.38 (.009 ? .015) typ 0.1016 0.0508 (.004 .002) 0.86 (.034) ref 0.65 (.0256) bsc 0 ? 6 typ detail ?a? detail ?a? gauge plane 1 2 3 4 4.90 0.152 (.193 .006) 8 7 6 5 3.00 0.102 (.118 .004) (note 3) 3.00 0.102 (.118 .004) (note 4) 0.52 (.0205) ref 5.23 (.206) min 3.20 ? 3.45 (.126 ? .136) 0.889 0.127 (.035 .005) recommended solder pad layout 0.42 0.038 (.0165 .0015) typ 0.65 (.0256) bsc package description ms8 package 8-lead plastic msop (reference ltc dwg # 05-08-1660 rev f) downloaded from: http:///
lt1460 24 1460fc .050 (1.27) bsc .060 p .005 (1.524 p 0.127) dia .90 (2.286) nom .180 p .005 (4.572 p 0.127) .180 p .005 (4.572 p 0.127) .500 (12.70) min .050 (1.270) max uncontrolledlead dimension .016 p .003 (0.406 p 0.076) 5 o nom bulk pack .015 p .002 (0.381 p 0.051) .060 p .010 (1.524 p 0.254) 10 o nom .140 p .010 (3.556 p 0.127) z3 (to-92) 1008 rev c 3 2 1 .098 +.016/C.04 (2.5 +0.4/C0.1) 2 plcs to-92 tape and reel refer to tape and reel section of ltc data book for additional information package description z package 3-lead plastic to-92 (similar to to-226) (reference ltc dwg # 05-08-1410 rev c) downloaded from: http:///
lt1460 25 1460fc 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 c 3/10 change ja on s3 package from 325c/w to 228c/w 2 (revision history begins at rev c) downloaded from: http:///
lt1460 26 1460fc linear technology corporation 1630 mccarthy blvd., milpitas, ca 95035-7417 (408) 432-1900 fax: (408) 434-0507 www.linear.com ?? linear technology corporation 2006 lt 0310 rev c ? printed in usa typical applications handling higher load currents boosted output current with no current limit boosted output current with current limit part number description comments lt1019 precision bandgap reference 0.05% max, 5ppm/c max lt1027 precision 5v reference 0.02%, 2ppm/c max lt1236 precision low noise reference 0.05% max, 5ppm/c max, so package lt1461 micropower precision low dropout 0.04% max, 3ppm/c max, 50ma output current lt1634 micropower precision shunt reference 1.25v, 2.5v output 0.05%, 25ppm/c max lt1790 micropower precision series references 0.05% max, 10ppm/c max, 60a supply, sot23 package ltc ? 1798 micropower low dropout reference, fixed or adjustable 0.15% max, 40ppm/c, 6.5a max supply current ltc6652 low drift low noise buffered reference 0.05% accuracy, 5ppm/c drift, 2.1ppm (0.1hz to 10hz) noise lt6660 tiny micropower precision series references 0.075% max, 10ppm/c max, 20ma output, 2mm 2mm dfn package 1460 ta03 r l 40ma v + r1* v out typical loadcurrent = 50ma select r1 to deliver 80% of typical load current.lt1460 will then source as necessary to maintain proper output. do not remove load as output will be driven unregulated high. line regulation is degraded in this application * 10ma 47f + lt1460 out gnd in r1 = v + C v out 40ma v + (v out + 1.8v) lt1460 out gnd in 1460 ta04 2n2905 v out 100ma 47f 2fsolid tant r1220 + + 1460 ta05 2n2905 v out 100ma 2fsolid tant d1*led v + v out + 2.8v 8.2 r1220 glows in current limit,do not omit * 47f + + lt1460 out gnd in related parts downloaded from: http:///

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