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1 l t1460s3 (sot-23) family of micropower series references in sot-23 3-lead sot-23 package low drift: 20ppm/ c max high accuracy: 0.2% max low supply current 20ma output current guaranteed no output capacitor required reverse-battery protection low pc board solder stress: 0.02% typ voltage options: 2.5v, 3v, 3.3v, 5v and 10v the lt1460 is also available in so-8, 8-lead msop, 8-lead pdip and to-92 packages. operating temperature range: 40 c to 85 c the lt 1460s3 is a family of sot-23 micropower series references that combine high accuracy and low drift with low power dissipation and small package size. these series references use curvature compensation to obtain low tem- perature coefficient, and laser trimmed precision thin-film resistors to achieve high output accuracy. furthermore, output shift due to pc board soldering stress has been dramatically reduced. these references will supply up to 20ma, making them ideal for precision regulator applica- tions, yet they are almost totally immune to input voltage variations. these series references provide supply current and power dissipation advantages over shunt references that must idle the entire load current to operate. additionally, the lt1460s3 does not require an output compensation capaci- tor. this feature is important in applications where pc board space is a premium or fast settling is demanded. reverse- battery protection keeps these references from conducting reverse current. handheld instruments precision regulators a/d and d/a converters power supplies hard disk drives basic connection , ltc and lt are registered trademarks of linear technology corporation. typical distribution of sot-23 lt1460hc v out after ir reflow solder features descriptio u applicatio s u typical applicatio u lt1460s3 gnd in out v out + 0.9v v in 20v 1460s3 ta01 c1 0.1 f v out output voltage error (%) 0.3 distribution (%) 12 16 20 0 0.2 1460s3 ta02 8 4 0 0.2 0.1 0.1 24 28 32 0.3 lt1460hc limits
2 l t1460s3 (sot-23) absolute m axi m u m ratings w ww u package/order i n for m a tio n w u u input voltage ........................................................... 30v reverse voltage .................................................... 15v output short-circuit duration, t a = 25 c .............. 5 sec specified temperature range ..................... 0 c to 70 c order part number s3 part marking ? ? product may be identified with either part marking. *the temperature grades and parametric grades are identified by a label on the shipping container. consult factory for industrial and military grade parts. t jmax = 125 c, ja = 325 c/ w 3 gnd in 1 top view s3 package 3-lead plastic sot-23 out 2 ltac ltad ltae ltan ltap ltaq ltar ltas ltat ltak ltal ltam ltau ltav ltaw operating temperature range (note 2) ............................................. 40 c to 85 c storage temperature range (note 3) ... 65 c to 150 c lead temperature (soldering, 10 sec).................. 300 c (note 1) lt1460hcs3-2.5 lt1460jcs3-2.5 lt1460kcs3-2.5 lt1460hcs3-3 lt1460jcs3-3 lt1460kcs3-3 lt1460hcs3-3.3 lt1460jcs3-3.3 lt1460kcs3-3.3 lt1460hcs3-5 lt1460jcs3-5 lt1460kcs3-5 lt1460hcs3-10 lt1460jcs3-10 lt1460kcs3-10 av ailable optio s u output voltage specified temperature accuracy temperature part order (v) range (%) coefficient (ppm/ c) number 2.5 0 c to 70 c 0.2 20 lt1460hcs3-2.5 2.5 0 c to 70 c 0.4 20 lt1460jcs3-2.5 2.5 0 c to 70 c 0.5 50 lt1460kcs3-2.5 30 c to 70 c 0.2 20 lt1460hcs3-3 30 c to 70 c 0.4 20 lt1460jcs3-3 30 c to 70 c 0.5 50 lt1460kcs3-3 3.3 0 c to 70 c 0.2 20 lt1460hcs3-3.3 3.3 0 c to 70 c 0.4 20 lt1460jcs3-3.3 3.3 0 c to 70 c 0.5 50 lt1460kcs3-3.3 50 c to 70 c 0.2 20 lt1460hcs3-5 50 c to 70 c 0.4 20 lt1460jcs3-5 50 c to 70 c 0.5 50 lt1460kcs3-5 10 0 c to 70 c 0.2 20 lt1460hcs3-10 10 0 c to 70 c 0.4 20 lt1460jcs3-10 10 0 c to 70 c 0.5 50 lt1460kcs3-10 or lth8* or lth9* or ltj1* or ltj2* or ltj3*
3 l t1460s3 (sot-23) parameter conditions min typ max units output voltage tolerance (note 4) lt1460hcs3 0.2 0.2 % lt1460jcs3 0.4 0.4 % lt1460kcs3 0.5 0.5 % output voltage temperature coefficient (note 5) lt1460hcs3 10 20 ppm/ c lt1460jcs3 10 20 ppm/ c lt1460kcs3 25 50 ppm/ c line regulation v out + 0.9v v in v out + 2.5v 150 800 ppm/v 1000 ppm/v v out + 2.5v v in 20v 50 100 ppm/v 130 ppm/v load regulation sourcing (note 6) i out = 100 a 1000 3000 ppm/ma 4000 ppm/ma i out = 10ma 50 200 ppm/ma 300 ppm/ma i out = 20ma 20 70 ppm/ma 100 ppm/ma thermal regulation (note 7) ? p = 200mw 2.5 10 ppm/mw dropout voltage (note 8) v in ?v out , ? v out 0.2%, i out = 0 0.9 v v in ?v out , ? v out 0.2%, i out = 10ma 1.3 v 1.4 v output current short v out to gnd 40 ma reverse leakage v in = 15v 0.5 10 a output voltage noise (note 9) 0.1hz f 10hz 4 ppm (p-p) 10hz f 1khz 4 ppm (rms) long-term stability of output voltage (note 10) 100 ppm/ khr hysteresis (note 11) ? t = 0 c to 70 c 50 ppm ? t = ?0 c to 85 c 250 ppm supply current lt1460s3-2.5 115 145 a 175 a lt1460s3-3 145 180 a 220 a lt1460s3-3.3 145 180 a 220 a lt1460s3-5 160 200 a 240 a lt1460s3-10 215 270 a 350 a electrical characteristics the denotes specifications which apply over the full specified temperature range, otherwise specifications are at t a = 25 c. v in = v out + 2.5v, i out = 0 unless otherwise specified. note 1: absolute maximum ratings are those values beyond which the life of a device may be impaired. note 2: the lt1460s3 is guaranteed functional over the operating temperature range of 40 c to 85 c. note 3: if the parts are stored outside of the specified temperature range, the output may shift due to hysteresis. note 4: esd (electrostatic discharge) sensitive devices. extensive use of esd protection devices are used internal to the lt1460s3, however, high electrostatic discharge can damage or degrade the device. use proper esd handling precautions. note 5: temperature coefficient is measured by dividing the change in output voltage by the specified temperature range. incremental slope is also measured at 25 c.
4 l t1460s3 (sot-23) typical perfor m a n ce characteristics uw 2.5v minimum input-output voltage differential 2.5v load regulation, sourcing 2.5v load regulation, sinking electrical characteristics note 6: 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 7: 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 8: excludes load regulation errors. note 9: peak-to-peak noise is measured with a single 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 sec. rms noise is measured with a single pole highpass filter at 10hz and a 2-pole lowpass filter at 1khz. the resulting output is full wave rectified 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 bandpass of the filters. note 10: 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 11: 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 25 c, but the ic is cycled to 70 c or 0 c before successive measurements. hysteresis is roughly proportional to the square of the temperature change. hysteresis is not normally a problem for operational temperature excursions where the instrument might be stored at high or low temperature. see applications information. characteristic curves are similar for most lt1460s3s. curves from the lt1460s3-2.5 and the lt1460-10 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. input-output voltage (v) 0 0.1 output current (ma) 10 125 c 25 c 100 0.5 1.0 1.5 2.0 2.5 1460s3 g01 1 ?5 c output current (ma) 0.1 2.0 output voltage change (mv) 1.0 0 110 100 1460s3 g02 3.0 2.5 1.5 0.5 3.5 4.0 ?5 c 25 c 125 c output current (ma) 0 0 output voltage change (mv) 20 40 60 80 100 120 1234 ?5 c 1460s3 g03 5 125 c 25 c
5 l t1460s3 (sot-23) frequency (khz) 1 output impedance ( ? ) 10 100 1000 0.01 1 10 100 0.1 0.1 1000 1460s3 g08 c l = 0 f c l = 0.1 f c l = 1 f frequency (khz) 20 power supply rejection ratio (db) 40 50 70 80 0.1 10 100 1000 1460s3 g07 0 1 60 30 10 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 response 2.5v output noise 0.1hz to 10hz typical perfor m a n ce characteristics uw characteristic curves are similar for most lt1460s3s. curves from the lt1460s3-2.5 and the lt1460-10 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. 20 10 1 0.1 load current (ma) 200 s/div 1460s3 g09 c load = 0 f input voltage (v) 0 supply current ( a) 100 150 125 c 25 c ?5 c 20 1460s3 g05 50 0 5 10 15 250 200 input voltage (v) 0 output voltage (v) 2.502 2.501 2.500 2.499 2.498 2.497 2.496 2.495 2.494 16 1460s3 g06 4812 20 14 2610 18 25 c 125 c ?5 c time (2 sec/div) output noise (20 v/div) 1460s3 g11 temperature ( c) ?0 output voltage (v) 2.501 2.502 2.503 25 75 1460s3 g04 2.500 2.499 ?5 0 50 100 125 2.498 2.497 three typical parts 2.5v output voltage noise spectrum frequency (hz) 100 1000 10 1k 10k 1460 -2.5 g10 100 100k noise voltage (nv/ hz)
6 l t1460s3 (sot-23) typical perfor m a n ce characteristics uw characteristic curves are similar for most lt1460s3s. curves from the lt1460s3-2.5 and the lt1460-10 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. 10v minimum input-output voltage differential 10v load regulation, sourcing 10v load regulation, sinking input-output voltage (v) 0 0.1 output current (ma) 10 125 c 25 c 100 0.5 1.0 1.5 2.0 2.5 1460s3 g12 1 ?5 c output current (ma) 0.1 15 output voltage change (mv) 20 25 30 35 110 100 1460s3 g13 10 5 ? ?0 0 125 c 25 c ?5 c output current (ma) 0 output voltage change (mv) 150 200 250 4 1460s3 g14 100 50 0 1 2 3 5 125 c ?5 c 25 c 10v output voltage temperature drift 10v supply current vs input voltage 10v line regulation temperature ( c) ?0 output voltage (v) 10.002 10.004 10.006 0 50 75 1460s3 g15 9.998 10.000 9.996 9.994 9.992 9.990 9.988 9.986 9.984 9.982 ?5 25 100 125 three typical parts input voltage (v) 0 0 supply current ( a) 50 150 200 250 350 2 10 14 1460s3 g16 100 300 8 18 20 4 6 12 16 125 c ?5 c 25 c input voltage (v) 6 output voltage (v) 10.000 10.005 10.010 12 16 1560s3 g17 9.995 9.990 810 14 18 20 9.985 9.980 125 c ?5 c 25 c 10v power supply rejection ratio vs frequency 10v output impedance vs frequency 10v transient response frequency (khz) 30 power supply rejection ratio (db) 90 100 20 10 80 50 70 60 40 0.1 10 100 1000 1460s3 g18 0 1 frequency (khz) 1 output impedance ( ? ) 10 100 1000 0.01 1 10 100 0.1 0.1 1000 1460s3 g19 c l = 0 f c l = 0.1 f c l = 1 f 20 10 1 0.1 load current (ma) 200 s/div 1460s3 g20 c load = 0 f
7 l t1460s3 (sot-23) applicatio n s i n for m a tio n wu u u 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, result- ing in high dissipation and short battery life. the lt1460s3 series references do not require a current setting resistor and can operate with any supply voltage from v out + 0.9v to 20v. when the circuitry being regu- lated does not demand current, the lt1460s3s reduce their dissipation and battery life is extended. if the refer- ences are not delivering load current, they dissipate only several mw, yet the same connection can deliver 20ma of load current when demanded. capacitive loads the lt1460s3 family of references are designed to be stable with a large range of capacitive loads. with no typical perfor m a n ce characteristics uw characteristic curves are similar for most lt1460s3s. curves from the lt1460s3-2.5 and the lt1460-10 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. 10v output noise 0.1hz to 10hz time (2 sec/div) output noise (20 v/div) 1460s3 g22 capacitive load, these references are ideal for fast settling or applications where pc board space is a premium. the test circuit shown in figure 1 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 2 shows the response of the reference to these 1ma and 10ma load steps with no load capacitance, and figure 3 shows a 1ma and 10ma load step with a 0.1 f output capacitor. figure 4 shows the response to a 1ma load step with c l = 1 f and 4.7 f. lt1460s3-2.5 r l v out v gen 1460s3 f01 c in 0.1 f 2.5v 1.5v c l v in = 2.5v figure 1. response time test circuit 10v output voltage noise spectrum frequency (khz) 0.01 0.1 1 10 110 0.1 100 1460s3 g10 noise voltage ( v/ hz)
8 l t1460s3 (sot-23) 100 s/div v gen v out v out 1460s3 f02 2.5v 1.5v 1ma 10ma 1 s/div figure 2. c l = 0 f v gen v out 1460s3-5 f03 2.5v 1.5v 1ma 10ma figure 3. c l = 0.1 f v gen 1460s3 f04 2.5v 1.5v 1 f 100 s/div figure 4. i out = 1ma v out 4.7 f v out v out applicatio n s i n for m a tio n wu u u table 1 gives the maximum output capacitance for various load currents and output voltages 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. table 1. maximum output capacitance voltage option i out = 100 ai out = 1ma i out = 10ma i out = 20ma 2.5v >10 f>10 f2 f 0.68 f 3v >10 f>10 f2 f 0.68 f 3.3v >10 f>10 f1 f 0.68 f 5v >10 f>10 f1 f 0.68 f 10v >10 f1 f 0.15 f 0.1 f long-term drift long-term drift cannot be extrapolated from acceler- ated high temperature testing. this erroneous tech- nique gives drift numbers that are widely optimistic. the only way long-term drift can be determined is to mea- sure 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 ?eal world?applica- tion. the boards were then placed into a constant tempera- ture oven with t a = 30 c, their outputs were scanned regularly and measured with an 8.5 digit dvm. figure 5 shows typical long-term drift of the lt1460s3s. hours ?50 ppm ?0 50 150 ?00 0 100 200 400 600 800 1460s3 f05 1000 100 0 300 500 700 900 figure 5. typical long-term drift
9 l t1460s3 (sot-23) applicatio n s i n for m a tio n wu u u hysteresis hysteresis data shown in figure 5 and figure 6 represents the worst-case data taken on parts from 0 c to 70 c and from 40 c to 85 c. the output is capable of dissipating relatively high power, i.e., for the lt1460s3-2.5, p d = 17.5v ?20ma = 350mw. the thermal resistance of the sot-23 package is 325 c/w and this dissipation causes a 114 c internal rise producing a junction temperature of t j = 25 c + 114 c = 139 c. this elevated temperature will cause the output to shift due to thermal hysteresis. for highest performance in precision applications, do not let the lt1460s3? junction temperature exceed 85 c. fast turn-on it is recommended to add a 0.1 f or larger bypass capacitor to the input pin of the lt1460s3s. although this can help stability with large load currents, another reason is for proper start-up. the lt1460s3 can start in 10 s, but it is important to limit the dv/dt of the input. under light load conditions and with a very fast input, internal nodes overslew and this requires finite recovery time. figure 8 shows the result of no bypass capacitance on the input and no output load on the lt1460s3-5. in this case the supply dv/dt is 7.5v in 30ns which causes internal overslew, and the output does not bias to 5v until 40 s after turn-on. although 40 s is a typical turn-on time, it can be much longer. figure 9 shows the effect of a 0.1 f bypass capacitor which limits the input dv/dt to approximately 7.5v in 20 s. the part always starts quickly. figure 6. 0 c to 70 c hysteresis figure 7. 40 c to 85 c hysteresis v in 20 s/div figure 8. c in = 0 f 0v v out 0v 7.5v 1460s3 f08 v in 20 s/div figure 9. c in = 0.1 f v out 0v 7.5v 1460s3 f08 hysteresis (ppm) ?40 ?60 80 0 number of units 8 70 c to 25 c0 c to 25 c 10 12 1460s3 f06 6 4 80 160 ?00 ?20 40 40 120 200 2 0 18 16 14 240 worst-case hysteresis on 40 units hysteresis (ppm) 600 400 200 0 number of units 4 85 c to 25 c40 c to 25 c 5 6 1460s3 f07 3 2 200 400 500 300 100 100 300 500 1 0 9 8 7 600 worst-case hysteresis on 34 units
10 l t1460s3 (sot-23) applicatio n s i n for m a tio n wu u u output accuracy like all references, either series or shunt, the error budget of the lt1460s3s is made up of primarily three compo- nents: initial accuracy, temperature coefficient and load regulation. line regulation is neglected because it typically contributes only 150ppm/v. the lt1460s3s typically shift 0.02% when soldered into a pcb, so this is also neglected. the output errors are calculated as follows for a 100 a load and 0 c to 70 c temperature range: lt1460hcs3 initial accuracy = 0.2% for i out = 100 a ? v out = (4000ppm/ma)(0.1ma) = 0.04% for temperature 0 c to 70 c the maximum ? t = 70 c ? v out = (20ppm/ c)(70 c) = 0.14% total worst-case output error is: 0.2% + 0.04% + 0.14% = 0.380% table 2 gives the worst-case accuracy for lt1460hcs3, lt1460jcs3 and lt1460kcs3 from 0 c to 70 c, and shows that if the lt1460hcs3 is used as a reference instead of a regulator, it is capable of 8 bits of absolute accuracy over temperature without a system calibration. table 2. worst-case output accuracy over temperature i out lt1460hcs3 lt1460jcs3 lt1460kcs3 0 a 0.340% 0.540% 0.850% 100 a 0.380% 0.580% 0.890% 10ma 0.640% 0.840% 1.15% 20ma 0.540% 0.740% 1.05%
11 l t1460s3 (sot-23) 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 represen- tation that the interconnection of its circuits as described herein will not infringe on existing patent rights. dimensions in millimeters (inches) unless otherwise noted. package descriptio n u s3 package 3-lead plastic sot-23 (ltc dwg # 05-08-1631) 0.95 0.037 bsc 1.20 ?1.40 (0.047 ?0.060) 0.55 (0.022) 0.37 ?0.51 (0.015 ?0.020) sot-23 0599 2.80 ?3.04 (0.110 ?0.120) 1.92 0.075 bsc 0.89 ?1.12 (0.035 ?0.044) 0.013 ?0.10 (0.0005 ?0.004) 0.09 ?0.18 (0.004 ?0.007) 0.45 ?0.60 (0.017 ?0.024) 2.10 ?2.64 (0.083 ?0.104) ref note: 1. dimensions are in millimeters 2. dimensions are inclusive of plating 3. dimensions are exclusive of mold flash and metal burr 4. mold flash shall not exceed 0.254mm 5. jedec reference is to-236 variation ab
12 l t1460s3 (sot-23) 1460s3fs, sn1460s3 lt/tp 0999 4k ?printed in usa ? l inear technology corporation 1997 linear technology corporation 1 630 mccarthy blvd., milpitas, ca 95035-7417 (408) 432-1900 fax: (408) 434-0507 telex: 499-3977 www.linear-tech.com handling higher load currents boosted output current with no current limit boosted output current with current limit related parts 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 ltc1798 micropower low dropout reference, fixed or adjustable 0.15% max, 40ppm/ c, 6.5 a max supply current typical applicatio n s u 1460s3 ta05 r l 40ma v + r1* v out typical load current = 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 47 f + lt1460s3 out gnd in r1 = v + ?v out 40ma v + (v out + 1.8v) lt1460s3 out gnd in 1460s3 ta03 2n2905 v out 100ma 47 f 2 f solid tant r1 220 ? + + 1460s3 ta04 2n2905 v out 100ma 2 f solid tant d1* led v + v out + 2.8v 8.2 ? r1 220 ? glows in current limit, do not omit * 47 f + + lt1460s3 out gnd in

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