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lt6660 1 6660fa change?in?v out ?(%) C0.09 0 distribution?(%) 4 8 16 20 24 32 6660?ta01b 12 28 0.09 C0.05 0.01 C0.01 0.05 tiny micropower precision series references in 2mm 2mm dfn the lt ? 6660 is a family of micropower series references that combine high accuracy and low drift with low power dissipation and extremely small package size. these se- ries references use curvature compensation to obtain low temperature coef?cient, and laser trimmed precision thin-?lm resistors to achieve high output accuracy. the lt6660 will supply up to 20ma with excellent line regula- tion characteristics, making it ideal for precision regulator applications. the lt6660 family of series references provide supp ly current and power dissipation advantages over shunt references that must idle the entire load current t o oper- ate. additionally, the lt6660 does not require an o utput compensation capacitor. this feature is important i n applications where pc board space is a premium, fast set- tling is demanded, or total capacitance must be kept to a minimum, as in intrinsic safety applications. reverse-bat- tery protection keeps these references from conduct ing reverse current. handheld instruments precision regulators a/d and d/a converters power supplies hard disk drives sensor modules no output capacitor required low drift: 20ppm/c max high accuracy: 0.2% max low supply current 20ma output current guaranteed reverse-battery protection low ir re?ow induced stress: 0.02% typ voltage options: 2.5v, 3v, 3.3v, 5v and 10v space-saving alternative to the lt1460 3-lead 2mm 2mm 0.75mm dfn package applicatio s u features descriptio u typical applicatio u ,?lt,?ltc?and?ltm?are?registered?trademarks?of?linear?technology?corporation.? all?other?trademarks?are?the?property?of?their?respective?owners. basic connection lt6660 gnd in out v out ?+?0.9v? ?v in ? ?20v 6660?ta01 c10.1 f v out lt6660h v out shift due to ir re?ow downloaded from: http:///
lt6660 2 6660fa input voltage .............................................................30v reverse voltage ......................................................C15v output short-circuit duration, t a = 25c ................5 sec speci?ed temperature range ...................... 0c to 70c (note 1) absolute axi u rati gs w w w u package/order i for atio u u w top?view out gnd in dc?package 3-lead?(2mm? ?2mm)?plastic?dfn 4 3 2 1 t jmax = 125c, ja = 102c/w exposed pad is gnd, must be soldered to pcb order part number dfn part marking* lt6660hcdc-2.5 lt6660jcdc-2.5 lt6660kcdc-2.5 lt6660hcdc-3 lt6660jcdc-3 lt6660kcdc-3 lt6660hcdc-3.3 lt6660jcdc-3.3 lt6660kcdc-3.3 lt6660hcdc-5 lt6660jcdc-5 lt6660kcdc-5 lt6660hcdc-10 lt6660jcdc-10 lt6660kcdc-10 lbxnlbxn lbxn lbyvlbyv lbyv lbywlbyw lbyw lbytlbyt lbyt lbyxlbyx lbyx order options tape and reel: add #tr lead free: add #pbf lead free tape and reel: add #trpbf lead free part marking: http://www.linear.com/leadfree/ consult ltc marketing for parts speci?ed with wider operating temperature ranges. *the temperature gra de is identi?ed by a label on the shipping containe r. operating temperature range (note 2) ............................................... C40c to 85c storage temperature range (note 3) ..... C65c to 150c lead temperature (soldering, 10 sec) .................. 300c available options output voltage (v) specified temperature range accuracy (%) temperature coefficient (ppm/c) part order number 2.5 2.5 2.5 0c to 70c 0c to 70c 0c to 70c 0.2 0.4 0.5 20 20 50 lt6660hcdc-2.5 lt6660jcdc-2.5 lt6660kcdc-2.5 3 3 3 0c to 70c 0c to 70c 0c to 70c 0.2 0.4 0.5 20 20 50 lt6660hcdc-3 lt6660jcdc-3 lt6660kcdc-3 3.3 3.3 3.3 0c to 70c 0c to 70c 0c to 70c 0.2 0.4 0.5 20 20 50 lt6660hcdc-3.3 lt6660jcdc-3.3 lt6660kcdc-3.3 downloaded from: http:///
lt6660 3 6660fa the denotes the speci?cations which apply over the full operating temperature range, otherwise speci?cations are at t a = 25c. v in = v out + 2.5v, i out = 0 unless otherwise speci?ed. electrical characteristics output voltage (v) specified temperature range accuracy (%) temperature coefficient (ppm/c) part order number 5 5 5 0c to 70c 0c to 70c 0c to 70c 0.2 0.4 0.5 20 20 50 lt6660hcdc-5 lt6660jcdc-5 lt6660kcdc-5 10 10 10 0c to 70c 0c to 70c 0c to 70c 0.2 0.4 0.5 20 20 50 lt6660hcdc-10 lt6660jcdc-10 lt6660kcdc-10 available options parameter conditions min typ max units output voltage tolerance lt6660hcdc C0.2 0.2 % lt6660jcdc C0.4 0.4 % lt6660kcdc C0.5 0.5 % output voltage temperature coef?cient (note 4) lt6660hcdc lt6660jcdc lt6660kcdc 10 10 25 20 20 50 ppm/c ppm/c ppm/c line regulation v out + 0.9v v in v out + 2.5v 150 800 1000 ppm/v ppm/v v out + 2.5v v in 20v 50 100 130 ppm/v ppm/v load regulation sourcing (note 5) i out = 100a 1000 3000 4000 ppm/ma ppm/ma i out = 10ma 50 200 300 ppm/ma ppm/ma i out = 20ma 20 70 100 ppm/ma ppm/ma thermal regulation (note 6) p = 200mw 2.5 10 ppm/mw dropout voltage (note 7) v in C v out , v out 0.2%, i out = 0 0.9 v v in C v out , v out 0.2%, i out = 10ma 1.3 1.4 v v output current short v out to gnd 40 ma reverse leakage v in = C15v 0.5 10 a output voltage noise (note 8) 0.1hz f 10hz 10hz f 1khz 4 4 ppm (p-p) ppm (rms) long-term stability of output voltage (note 9) 100 ppm/khr hysteresis (note 10) t = 0c to 70c t = C40c to 85c 50 250 ppm ppm supply current lt6660-2.5 115 145 175 a a lt6660-3 145 180 220 a a lt6660-3.3 145 180 220 a a lt6660-5 160 200 240 a a lt6660-10 215 270 350 a a downloaded from: http:///
lt6660 4 6660fa output?current?(ma) 0 0 output?voltage?change?(mv) 20 40 60 80 100 120 1 2 3 4 C 55 c 6660?g03 5 125 c 25 c output?current?(ma) 0.1 C 2.0 output?voltage?change?(mv) C 1.0 0 1 10 100 6660?g02 C 3.0 C 2.5 C 1.5 C 0.5 C 3.5 C 4.0 C 55 c 25 c 125 c 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 6660?g01 1 C 55 c characteristic curves are similar for all voltage options of the lt6660. curves from the lt6660-2.5 and the lt6660-10 represent the extremes of the vo ltage options. characteristic curves for other output voltages fall between these curves, and can be estimated based on their volt age output. typical perfor a ce characteristics u w note 1: stresses beyond those listed under absolute maximum ratings may cause permanent damage to the device. exposure to any absolute maximum rating condition for extended periods may affect device reliability and lifetime. note 2: the lt6660 is guaranteed functional over the operating temperature range of C40c to 85c.note 3: if the parts are stored outside of the speci?ed temperature range, the output may shift due to hysteresis.note 4: temperature coef?cient is measured by dividing the change in output voltage by the speci?ed temperature range. incremental slope is also measured at 25c. note 5: load regulation is measured on a pulse basis from no load to the speci?ed load current. output changes due to die temperature change must be taken into account separately. note 6: 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 7: excludes load regulation errors. note 8: peak-to-peak noise is measured with a single pole highpass ?lter at 0.1hz and 2-pole lowpass ?lter at 10hz. the unit is enclosed in a still-air environment to eliminate thermocouple effects on the leads. the test time is 10 sec. rms noise is measured with a single pole highpass ?lter at 10hz and a 2-pole lowpass ?lter at 1khz. the resulting output is full wave recti?ed and then integrated for a ?xed period, making the ?nal 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 ?lters. note 9: 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 ?rst 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 10: 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 70c or 0c before successive measurements. hysteresis is roughly proportional to the square of the temperature change. for instruments that are stored at well-controlled temperatures (within 20 or 30 degrees of operational temperature) hysteresis is not a problem. electrical characteristics 2.5v minimum input-output voltage differential 2.5v load regulation, sourcing 2.5v load regulation, sinking downloaded from: http:///
lt6660 5 6660fa frequency?(hz) 100 1000 10 1k 10k 6660?g10 100 100k noise?voltage?(nv/ hz) 200 s/div c load ?=?0 f 2010 1 0.1 load?current?(ma) 6660?g09 time?(2?sec/div) ?output?noise?(20 v/div) 6660?g11 temperature?( c) C50 output?voltage?(v) 2.501 2.502 2.503 25 75 6660?g04 2.500 2.499 C25 0 50 100 125 2.498 2.497 three?typical?parts input?voltage?(v) 0 supply?current?( a) 100 150 125 c 25 c C 55 c 20 6660?g05 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 6660?g06 4 8 12 20 14 2 6 10 18 25 c 125 c C 55 c frequency?(khz) 20 power?supply?rejection?ratio?(db) 40 50 70 80 0.1 10 100 1000 6660?g07 0 1 6030 10 frequency?(khz) 1 output?impedance?( ? ) 10 100 1000 0.01 1 10 100 0.1 0.1 1000 6660?g08 c l ?=?0 f c l ?=?0.1 f c l ?=?1 f characteristic curves are similar for all voltage options of the lt6660. curves from the lt6660-2.5 and the lt6660-10 represent the extremes of the vo ltage options. characteristic curves for other output voltages fall between these curves, and can be estimated based on their volt age output. typical perfor a ce characteristics u w 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 voltage noise spectrum 2.5v output noise 0.1hz to 10hz downloaded from: http:///
lt6660 6 6660fa 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 6660?g12 1 C 55 c output?current?(ma) 0.1 15 output?voltage?change?(mv) 20 25 30 35 1 10 100 6660?g13 10 5 C 5 C10 0 125 c 25 c C 55 c output?current?(ma) 0 output?voltage?change?(mv) 150 200 250 4 6660?g14 100 50 0 1 2 3 5 125 c C55 c 25 c input?voltage?(v) 0 0 supply?current?( a) 50 150 200 250 350 2 10 14 6660?g16 100 300 8 18 20 4 6 12 16 125 c C 55 c 25 c temperature?( c) C 50 output?voltage?(v) 10.002 10.004 10.006 0 50 75 6660?g15 9.998 10.000 9.9969.994 9.992 9.990 9.988 9.986 9.984 9.982 C 25 25 100 125 three?typical?parts input?voltage?(v) 6 output?voltage?(v) 10.000 10.005 10.010 12 16 6660?g17 9.995 9.990 8 10 14 18 20 9.985 9.980 125 c C 55 c 25 c characteristic curves are similar for all voltage options of the lt6660. curves from the lt6660-2.5 and the lt6660-10 represent the extremes of the vo ltage options. characteristic curves for other output voltages fall between these curves, and can be estimated based on their volt age output. typical perfor a ce characteristics u w 10v minimum input-output voltage differential 10v load regulation, sourcing 10v load regulation, sinking 10v output voltage temperature drift 10v supply current vs input voltage 10v line regulation downloaded from: http:///
lt6660 7 6660fa frequency?(khz) 0.01 0.1 1 10 1 10 0.1 100 6660?g21 noise?voltage?( v/ hz) 200 s/div c load ?=?0 f 2010 1 0.1 load?current?(ma) 6660?g20 frequency?(khz) 30 power?supply?rejection?ratio?(db) 90 100 2010 8050 7060 40 0.1 10 100 1000 6660?g18 0 1 frequency?(khz) 1 output?impedance?( ? ) 10 100 1000 0.01 1 10 100 0.1 0.1 1000 6660?g19 c l ?=?0 f c l ?=?0.1 f c l ?=?1 f time?(2?sec/div) output?noise?(20 v/div) 6660?g22 characteristic curves are similar for all voltage options of the lt6660. curves from the lt6660-2.5 and the lt6660-10 represent the extremes of the vo ltage options. characteristic curves for other output voltages fall between these curves, and can be estimated based on their volt age output. typical perfor a ce characteristics u w 10v output voltage noise spectrum 10v output noise 0.1hz to 10hz 10v power supply rejection ratio vs frequency 10v output impedance vs frequency 10v transient response downloaded from: http:///
lt6660 8 6660fa applicatio s i for atio w u u u longer battery life series references have a large advantage over older shunt style references. shunt references require a resist or 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 lt6660 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 lt6660s reduce their dissipation and battery life is extended. if the references 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 lt6660 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 applica- tions 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 0.1f output capaci- tor. figure 4 shows the response to a 1ma load step with c l = 1f and 4.7f. figure 2. c l = 0f figure 3. c l = 0.1f figure 4. i out = 1ma 1 s/div v gen v out v out 2.5v1.5v 1ma 10ma 6660?f02 100 s/div v gen v out v out 2.5v1.5v 1ma 10ma 6660?f03 100 s/div v gen v out v out 2.5v1.5v 1 f 4.7 f 6660?f04 figure 1. response time test circuit lt6660-2.5 r l v out v gen 6660?f01 c in 0.1 f 2.5v1.5v c l v in ?=?2.5v downloaded from: http:///
lt6660 9 6660fa hysteresis?(ppm) C240 C160 C 80 0 number?of?units 8 70 c?to?25 c 0 c?to?25 c 10 12 6660?f06 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 85 c?to?25 c C40 c?to?25 c 5 6 6660?f07 3 2 200 400 C500 C300 C100 100 300 500 1 0 98 7 600 worst-case?hysteresison?34?units figure 6. 0c to 70c hysteresis figure 7. C 40c to 85c hysteresis figure 5. typical long-term drift hours C150 ppm C 50 50 150 C100 0 100 200 400 600 800 6660?f05 1000 100 0 300 500 700 900 applicatio s i for atio w u u u table 1 gives the maximum output capacitance for vari- ous 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 = 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 lt6660 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 5 shows typical long-term drift of the lt6660s. hysteresis hysteresis data shown in figure 6 and figure 7 represents the worst-case data taken on parts from 0c to 70c and from C40c to 85c. the output is capable of dissipat- ing relatively high power, i.e., for the lt6660-2.5, p d = 17.5v ? 20ma = 350mw. the thermal resistance of the dfn package is 102c/w and this dissipation causes a 36c internal rise. this elevated temperature may cause the output to shift due to thermal hysteresis. for highest performance in precision applications, do not let the lt6660s junction temperature exceed 85c. input capacitance it is recommended that a 0.1f or larger capacitor be added to the input pin of the lt6660. this can help with stability when large load currents are demanded. downloaded from: http:///
lt6660 10 6660fa output accuracy like all references, either series or shunt, the error budget of the lt6660s is made up of primarily three components: initial accuracy, temperature coef?cient and load r egulation. line regulation is neglected because it typically c ontributes only 150ppm/v. the lt6660s typically shift 0.02% when soldered into a pcb, so this is also neglected. the output errors are calculated as follows for a 100a load and 0c to 70c temperature range: lt6660hcdc initial accuracy = 0.2% for i out = 100a v out = (4000ppm/ma)(0.1ma) = 0.04% for temperature 0c to 70c the maximum t = 70c v out = (20ppm/c)(70c) = 0.14% total worst-case output error is: 0.2% + 0.04% + 0.14% = 0.380% table 2 gives the worst-case accuracy for lt6660hc, lt6660jc and lt6660kc from 0c to 70c, and shows that if the lt6660hc 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 lt6660hcdc lt6660jcdc lt6660kcdc 0a 0.340% 0.540% 0.850% 100a 0.380% 0.580% 0.890% 10ma 0.640% 0.840% 1.15% 20ma 0.540% 0.740% 1.05% applicatio s i for atio w u u u downloaded from: http:///
lt6660 11 6660fa 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 pate nt rights. package descriptio u 2.00? 0.10 (4?sides) note:1.?drawing?to?be?made?a?jedec?package?outline?m0-229?variation?of?(w-tbd) 2.?drawing?not?to?scale 3.?all?dimensions?are?in?millimeters 4.?dimensions?of?exposed?pad?on?bottom?of?package?do?not?include? ????mold?flash.?mold?flash,?if?present,?shall?not?exceed?0.15mm?on?any?side 5.?exposed?pad?shall?be?solder?plated? 6.?shaded?area?is?only?a?reference?for?pin?1?location?on?the? top?and?bottom?of?package bottom?viewexposed?pad 1.00? ?0.05 (2?sides) 1.35? ?0.05 (2?sides) 0.75? 0.05 0.40? 0.05 0.70? 0.05 1 3 pin?1?bar top?mark (see?note?6) 0.200?ref 0.00?C?0.05 (dc3)?dfn?1205?rev?? 0.25? ?0.05 r?=?0.05typ r?=?0.115?typ 0.50?bsc 0.25? ?0.05 1.35? 0.05 (2?sides) recommended?solder?pad?pitch?and?dimensions 1.00? 0.05 (2?sides) 1.30? 0.05 2.00? 0.05 packageoutline 0.50?bsc pin?1?notchr?=?0.20?or 0.25? ?45 chamfer dc package 3-lead plastic dfn (2mm 2mm) (reference ltc dwg # 05-08-1717 rev ?) downloaded from: http:///
lt6660 12 6660fa 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 0406 rev a printed in usa ?v + ? ?(v out ?+?1.8v)? lt6660 out gnd in 6660 ta03 2n2905 v out 100ma 47 f 2 f solidtant r1220 ? + + 32 1 6660?ta04 2n2905 v out 100ma 2 f solidtant d1*led v + ? ?v out ?+?2.8v 8.2 ? r1220 ? glows?in?current?limit,do?not?omit * 47 f + + lt6660 out gnd in 32 1 6660?ta02 r l 40ma v + r1* v out typical?loadcurrent?=?50ma select?r1?to?deliver?80%?of?typical?load?current.lt6660?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 + lt6660 out gnd in r1?=? v + ?C?v out 40ma 32 1 typical applicatio u related parts 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 lt1460 micropower series references 0.075% max, 10ppm/c max, 20ma output current 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 curre nt downloaded from: http:///

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