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slvs075i ? april 1989 ? revised december 2005 1 post office box 655303 ? dallas, texas 75265 operating current range ? lm285 ...10 a to 20 ma ? lm385 ...15 a to 20 ma ? lm385b ...15 a to 20 ma 1% and 2% initial voltage tolerance reference impedance ? lm385 ...1 ? max at 25 c ? all devices . . . 1.5 ? max over full temperature range very low power consumption applications ? portable meter references ? portable test instruments ? battery-operated systems ? current-loop instrumentation ? panel meters interchangeable with industry standard lm285-1.2 and lm385-1.2 description/ordering information these micropower, two-terminal, band-gap voltage references operate over a 10- a to 20-ma current range and feature exceptionally low dynamic impedance and good temperature stability. on-chip trimming provides tight voltage tolerance. the band-gap reference for these devices has low noise and long-term stability. ordering information t a v z tolerance package ? orderable part number top-side marking soic (d) tube of 75 lm385d-1-2 385-12 soic (d) reel of 2000 lm385dr-1-2 385-12 sop (ps) reel of 2000 lm385psr-1-2 l385-12 2% to-226 / to-92 (lp) tube of 1000 lm385lp-1-2 385-12 2% to-226 / to-92 (lp) reel of 2000 lm385lpr-1-2 385-12 tssop (pw) tube of 150 lm385pw-1-2 385-12 0 c to 70 c tssop (pw) reel of 2000 lm385pwr-1-2 385-12 0 c to 70 c soic (d) tube of 75 lm385bd-1-2 385b12 soic (d) reel of 2000 lm385bdr-1-2 385b12 1% to-226 / to-92 (lp) tube of 1000 lm385blp-1-2 385b12 1% to-226 / to-92 (lp) reel of 2000 lm385blpr-1-2 385b12 tssop (pw) tube of 150 lm385bpw-1-2 385b12 tssop (pw) reel of 2000 lm385bpwr-1-2 385b12 soic (d) tube of 75 lm285d-1-2 285-12 ?40 c to 85 c 1% soic (d) reel of 2000 lm285dr-1-2 285-12 ?40 c to 85 c 1% to-226 / to-92 (lp) tube of 1000 lm285lp-1-2 285-12 ? package drawings, standard packing quantities, thermal data, symbolization, and pcb design guidelines are available at www.ti.com/sc/package. copyright ? 2005, texas instruments incorporated please be aware that an important notice concerning avail ability, standard warranty, and use in critical applications of texas instruments semiconductor products and disclaimers thereto appears at the end of this data sheet. 1 2 3 4 8 7 6 5 nc nc nc anode cathode nc nc nc lm285-1.2 ... d p ackage lm385-1.2 . . . d, ps, or pw package lm385b-1.2 ...d or pw p ackage (top view) nc ? no internal connection lm285-1.2, lm385-1.2, lm385b-1.2 . . . lp package (top view) nc ? no internal connection nc cathode anode
slvs075i ? april 1989 ? revised december 2005 2 post office box 655303 ? dallas, texas 75265 description/ordering information (continued) the design makes these devices exceptionally tolerant of capacitive loading and, thus, easier to use in most reference applications. the wide dynamic operating temperature range accommodates varying current supplies, with excellent regulation. the extremely low power drain of this series makes them useful for micropower circuitry. these voltage references can be used to make portable meters, regulators, or general-purpose analog circuitry, with battery life approaching shelf life. the wide operating current range allows them to replace older references with tighter-tolerance parts. symbol anode cathode schematic cathode q13 q12 q7 q4 600 k ? 7.5 k ? anode 200 k ? 50 k ? 300 k ? q14 20 pf 20 pf q11 q10 q9 q5 q3 q1 q2 q8 q6 60 k ? 500 ? 100 k ? note a: component values shown are nominal.
slvs075i ? april 1989 ? revised december 2005 3 post office box 655303 ? dallas, texas 75265 absolute maximum ratings over operating free-air temperature range (unless otherwise noted) ? reverse current, i r 30 ma . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . forward current, i f 10 ma . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . package thermal impedance, ja (see notes 1 and 2): d package 97 c/w . . . . . . . . . . . . . . . . . . . . . . . . . . . . lp package 140 c/w . . . . . . . . . . . . . . . . . . . . . . . . . . ps package 95 c/w . . . . . . . . . . . . . . . . . . . . . . . . . . . pw package 149 c/w . . . . . . . . . . . . . . . . . . . . . . . . . operating virtual junction temperature, t j 150 c . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . lead temperature 1,6 mm (1/16 inch) from case for 10 seconds 260 c . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . storage temperature range, t stg ?65 c to 150 c . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ? stresses beyond those listed under ?absolute maximum ratings? may cause permanent damage to the device. these are stress ratings only, a nd functional operation of the device at these or any other conditions beyond those indicated under ?recommended operating conditi ons? is not implied. exposure to absolute-maximum-rated conditions for extended periods may affect device reliability. notes: 1. maximum power dissipation is a function of t j(max) , ja , and t a . the maximum allowable power dissipation at any allowable ambient temperature is p d = (t j(max) ? t a )/ ja . operation at the absolute maximum t j of 150 c can affect reliability. 2. the package thermal impedance is calculated in accordance with jesd 51-7. recommended operating conditions min max unit i z reference current 0.01 20 ma t a operating free-air temperature range lm285-1.2 ?40 85 c t a operating free-air temperature range lm385-1.2, lm385b-1.2 0 70 c
slvs075i ? april 1989 ? revised december 2005 4 post office box 655303 ? dallas, texas 75265 electrical characteristics at specified free-air temperature parameter test t a ? lm285-1.2 lm385-1.2 lm385b-1.2 unit parameter test conditions t a ? min typ max min typ max min typ max unit v z reference voltage i z = i(min) to 20 ma ? 25 c 1.223 1.235 1.247 1.21 1.235 1.26 1.223 1.235 1.247 v vz average temperature coefficient of reference voltage i z = i(min) to 20 ma ? full range 20 20 20 ppm/ c change in i z = i(min) 25 c 1 1 1 ? v z change in reference i z = i(min) to 1 ma ? full range 1.5 1.5 1.5 mv ? v z reference voltage with current i z = 1 ma 25 c 12 20 20 mv voltage with current i z = 1 ma to 20 ma full range 30 30 30 ? v z / ? t long-term change in reference voltage i z = 100 a 25 c 20 20 20 ppm/khr i z (min) minimum reference current full range 8 10 8 15 8 15 a z z reference i z = 100 a, 25 c 0.2 0.6 0.4 1 0.4 1 ? a, f = 25 hz full range 1.5 1.5 1.5 ? v n broadband noise voltage i z = 100 a, f = 10 hz to 10 khz 25 c 60 60 60 v ? full range is ?40 c to 85 c for the lm285-1.2 and 0 c to 70 c for the lm385-1.2 and lm385b-1.2. ? i(min) = 10 a for the lm285-1.2 and 15 a for the lm385-1.2 and lm385b-1.2 the average temperature coef ficient of reference voltage is defined as the total change in reference voltage divided by the specified temperature range.
slvs075i ? april 1989 ? revised december 2005 5 post office box 655303 ? dallas, texas 75265 typical characteristics ? figure 1 0 0.2 0.4 0.6 0.8 1 1.2 1.4 ??????? ??????? c to 125 c ? reverse current ? v r ? reverse voltage ? v 0.1 1 10 100 reverse current vs reverse voltage i r a figure 2 10 1 0.1 0.01 ?4 0 4 8 12 16 i r ? reverse current ? ma ? reference voltage change ? mv reference voltage change vs reverse current 100 ? v z ?????? ?????? c to 125 c forward voltage vs forward current figure 3 0.01 0.1 1 10 100 0.8 1.2 0.4 0 i f ? forward current ? ma ? forward voltage ? v v f ???? c figure 4 105 125 85 65 45 25 5 ?15 ?35 ?55 1.225 1.23 1.235 1.24 1.245 t a ? free-air temperature ? c ? reference voltage ? v reference voltage vs free-air temperature v z 1.220 ? data at high and low temperatures are applicable only within the rated operating free-air temperature ranges of the various dev ices.
slvs075i ? april 1989 ? revised december 2005 6 post office box 655303 ? dallas, texas 75265 typical characteristics ? figure 5 reference impedance vs reference current i z ? reference current ? ma t a = ?55 c to 125 c f = 25 hz 100 10 1 0.1 100 10 1 0.1 0.01 z z ? reference impedance ? ? figure 6 noise voltage vs frequency vn ? noise voltage ? nv/ f ? frequency ? hz 700 600 500 400 300 200 100 0 10 100 1 k 10 k 100 k hz i z = 100 a t a = 25 c v n output noise voltage ? f ? cutoff frequency ? khz 100 10 1 0.1 70 60 50 40 30 20 10 0 i z = 100 a t a = 25 c output noise voltage vs cutoff frequency ????? v c r ???? ???? a figure 7 figure 8 input v i t ? time ? s input and output voltages ? v 0 100 500 600 0 5 0 0.5 1 1.5 v o 36 k ? transient response ??? ??? ? data at high and low temperatures are applicable only within the rated operating free-air temperature ranges of the various dev ices.
slvs075i ? april 1989 ? revised december 2005 7 post office box 655303 ? dallas, texas 75265 application information + 412 ? ? 1% ? adjust for 11.15 mv at 25 c across 953 ? ? adjust for 12.17 mv at 25 c across 412 ? 2.00 k ? 1% i o 58 a + 5.1 k ? r lm334 v? v+ 100 k ? 1% 10 k ? 953 ? ? 1% meter type k lm385-1.2 mercury cell 1.345 v ? ? 500 ? cw cw figure 9. thermocouple cold-junction compensator 2.3 v v+ 30 v r v? v+ 2.74 k ? 1.2 v lm385-1.2 lm334 figure 10. operation over a wide supply range lm385-1.2 1.2 v 499 k ? 9 v figure 11. reference from a 9-v battery
packaging information orderable device status (1) package type package drawing pins package qty eco plan (2) lead/ball finish msl peak temp (3) lm285d-1-2 active soic d 8 75 green (rohs & no sb/br) cu nipdau level-1-260c-unlim lm285de4-1-2 active soic d 8 75 green (rohs & no sb/br) cu nipdau level-1-260c-unlim lm285dg4-1-2 active soic d 8 75 green (rohs & no sb/br) cu nipdau level-1-260c-unlim lm285dr-1-2 active soic d 8 2500 green (rohs & no sb/br) cu nipdau level-1-260c-unlim lm285dre4-1-2 active soic d 8 2500 green (rohs & no sb/br) cu nipdau level-1-260c-unlim lm285drg4-1-2 active soic d 8 2500 green (rohs & no sb/br) cu nipdau level-1-260c-unlim lm285lp-1-2 active to-92 lp 3 1000 pb-free (rohs) cu sn n / a for pkg type lm285lpe3-1-2 active to-92 lp 3 1000 pb-free (rohs) cu sn n / a for pkg type lm285lpre3-1-2 active to-92 lp 3 2000 pb-free (rohs) cu sn n / a for pkg type lm385bd-1-2 active soic d 8 75 green (rohs & no sb/br) cu nipdau level-1-260c-unlim lm385bde4-1-2 active soic d 8 75 green (rohs & no sb/br) cu nipdau level-1-260c-unlim lm385bdg4-1-2 active soic d 8 75 green (rohs & no sb/br) cu nipdau level-1-260c-unlim lm385bdr-1-2 active soic d 8 2500 green (rohs & no sb/br) cu nipdau level-1-260c-unlim lm385bdre4-1-2 active soic d 8 2500 green (rohs & no sb/br) cu nipdau level-1-260c-unlim lm385bdrg4-1-2 active soic d 8 2500 green (rohs & no sb/br) cu nipdau level-1-260c-unlim lm385blp-1-2 active to-92 lp 3 1000 pb-free (rohs) cu sn n / a for pkg type lm385blpe3-1-2 active to-92 lp 3 1000 pb-free (rohs) cu sn n / a for pkg type lm385blpr-1-2 active to-92 lp 3 2000 pb-free (rohs) cu sn n / a for pkg type LM385BLPRE3-1-2 active to-92 lp 3 2000 pb-free (rohs) cu sn n / a for pkg type lm385bpw-1-2 active tssop pw 8 150 green (rohs & no sb/br) cu nipdau level-1-260c-unlim lm385bpwe4-1-2 active tssop pw 8 150 green (rohs & no sb/br) cu nipdau level-1-260c-unlim lm385bpwg4-1-2 active tssop pw 8 150 green (rohs & no sb/br) cu nipdau level-1-260c-unlim lm385bpwr-1-2 active tssop pw 8 2000 green (rohs & no sb/br) cu nipdau level-1-260c-unlim lm385bpwre4-1-2 active tssop pw 8 2000 green (rohs & no sb/br) cu nipdau level-1-260c-unlim lm385bpwrg4-1-2 active tssop pw 8 2000 green (rohs & no sb/br) cu nipdau level-1-260c-unlim package option addendum www.ti.com 11-nov-2009 addendum-page 1
orderable device status (1) package type package drawing pins package qty eco plan (2) lead/ball finish msl peak temp (3) lm385d-1-2 active soic d 8 75 green (rohs & no sb/br) cu nipdau level-1-260c-unlim lm385de4-1-2 active soic d 8 75 green (rohs & no sb/br) cu nipdau level-1-260c-unlim lm385dg4-1-2 active soic d 8 75 green (rohs & no sb/br) cu nipdau level-1-260c-unlim lm385dr-1-2 active soic d 8 2500 green (rohs & no sb/br) cu nipdau level-1-260c-unlim lm385dre4-1-2 active soic d 8 2500 green (rohs & no sb/br) cu nipdau level-1-260c-unlim lm385drg4-1-2 active soic d 8 2500 green (rohs & no sb/br) cu nipdau level-1-260c-unlim lm385lp-1-2 active to-92 lp 3 1000 pb-free (rohs) cu sn n / a for pkg type lm385lpe3-1-2 active to-92 lp 3 1000 pb-free (rohs) cu sn n / a for pkg type lm385lpr-1-2 active to-92 lp 3 2000 pb-free (rohs) cu sn n / a for pkg type lm385lpre3-1-2 active to-92 lp 3 2000 pb-free (rohs) cu sn n / a for pkg type lm385pw-1-2 active tssop pw 8 150 green (rohs & no sb/br) cu nipdau level-1-260c-unlim lm385pwe4-1-2 active tssop pw 8 150 green (rohs & no sb/br) cu nipdau level-1-260c-unlim lm385pwg4-1-2 active tssop pw 8 150 green (rohs & no sb/br) cu nipdau level-1-260c-unlim lm385pwr-1-2 active tssop pw 8 2000 green (rohs & no sb/br) cu nipdau level-1-260c-unlim lm385pwre4-1-2 active tssop pw 8 2000 green (rohs & no sb/br) cu nipdau level-1-260c-unlim lm385pwrg4-1-2 active tssop pw 8 2000 green (rohs & no sb/br) cu nipdau level-1-260c-unlim (1) the marketing status values are defined as follows: active: product device recommended for new designs. lifebuy: ti has announced that the device will be discontinued, and a lifetime-buy period is in effect. nrnd: not recommended for new designs. device is in production to support existing customers, but ti does not recommend using this part in a new design. preview: device has been announced but is not in production. samples may or may not be available. obsolete: ti has discontinued the production of the device. (2) eco plan - the planned eco-friendly classification: pb-free (rohs), pb-free (rohs exempt), or green (rohs & no sb/br) - please check http://www.ti.com/productcontent for the latest availability information and additional product content details. tbd: the pb-free/green conversion plan has not been defined. pb-free (rohs): ti's terms "lead-free" or "pb-free" mean semiconductor products that are compatible with the current rohs requirements for all 6 substances, including the requirement that lead not exceed 0.1% by weight in homogeneous materials. where designed to be soldered at high temperatures, ti pb-free products are suitable for use in specified lead-free processes. pb-free (rohs exempt): this component has a rohs exemption for either 1) lead-based flip-chip solder bumps used between the die and package, or 2) lead-based die adhesive used between the die and leadframe. the component is otherwise considered pb-free (rohs compatible) as defined above. green (rohs & no sb/br): ti defines "green" to mean pb-free (rohs compatible), and free of bromine (br) and antimony (sb) based flame retardants (br or sb do not exceed 0.1% by weight in homogeneous material) (3) msl, peak temp. -- the moisture sensitivity level rating according to the jedec industry standard classifications, and peak solder temperature. package option addendum www.ti.com 11-nov-2009 addendum-page 2
important information and disclaimer: the information provided on this page represents ti's knowledge and belief as of the date that it is provided. ti bases its knowledge and belief on information provided by third parties, and makes no representation or warranty as to the accuracy of such information. efforts are underway to better integrate information from third parties. ti has taken and continues to take reasonable steps to provide representative and accurate information but may not have conducted destructive testing or chemical analysis on incoming materials and chemicals. ti and ti suppliers consider certain information to be proprietary, and thus cas numbers and other limited information may not be available for release. in no event shall ti's liability arising out of such information exceed the total purchase price of the ti part(s) at issue in this document sold by ti to customer on an annual basis. package option addendum www.ti.com 11-nov-2009 addendum-page 3
tape and reel information *all dimensions are nominal device package type package drawing pins spq reel diameter (mm) reel width w1 (mm) a0 (mm) b0 (mm) k0 (mm) p1 (mm) w (mm) pin1 quadrant lm285dr-1-2 soic d 8 2500 330.0 12.4 6.4 5.2 2.1 8.0 12.0 q1 lm385bdr-1-2 soic d 8 2500 330.0 12.4 6.4 5.2 2.1 8.0 12.0 q1 lm385bpwr-1-2 tssop pw 8 2000 330.0 12.4 7.0 3.6 1.6 8.0 12.0 q1 lm385dr-1-2 soic d 8 2500 330.0 12.4 6.4 5.2 2.1 8.0 12.0 q1 lm385pwr-1-2 tssop pw 8 2000 330.0 12.4 7.0 3.6 1.6 8.0 12.0 q1 package materials information www.ti.com 29-jul-2009 pack materials-page 1
*all dimensions are nominal device package type package drawing pins spq length (mm) width (mm) height (mm) lm285dr-1-2 soic d 8 2500 340.5 338.1 20.6 lm385bdr-1-2 soic d 8 2500 340.5 338.1 20.6 lm385bpwr-1-2 tssop pw 8 2000 346.0 346.0 29.0 lm385dr-1-2 soic d 8 2500 340.5 338.1 20.6 lm385pwr-1-2 tssop pw 8 2000 346.0 346.0 29.0 package materials information www.ti.com 29-jul-2009 pack materials-page 2

mechanical data msot002a ? october 1994 ? revised november 2001 1 post office box 655303 ? dallas, texas 75265 lp (o-pbcy-w3) plastic cylindrical package 4040001-2 /c 10/01 straight lead option 0.016 (0,41) 0.014 (0,35) 0.157 (4,00) max formed lead option 0.104 (2,65) 0.210 (5,34) 0.170 (4,32) 0.050 (1,27) 0.016 (0,41) 0.022 (0,56) 0.500 (12,70) min seating plane 0.175 (4,44) 0.205 (5,21) 0.165 (4,19) 0.125 (3,17) dia d c 0.105 (2,67) 0.095 (2,41) 0.135 (3,43) min 0.080 (2,03) 0.055 (1,40) 0.045 (1,14) 1 0.105 (2,67) 23 0.080 (2,03) 0.105 (2,67) notes: a. all linear dimensions are in inches (millimeters). b. this drawing is subject to change without notice. c. lead dimensions are not controlled within this area d. falls within jedec to -226 variation aa (to-226 replaces to-92) e. shipping method: straight lead option available in bulk pack only. formed lead option available in tape & reel or ammo pack.
mechanical data msot002a ? october 1994 ? revised november 2001 2 post office box 655303 ? dallas, texas 75265 lp (o-pbcy-w3) plastic cylindrical package 4040001-3 /c 10/01 0.094 (2,40) 0.114 (2,90) 0.460 (11,70) 0.539 (13,70) tape & reel 0.335 (8,50) 0.384 (9,75) 0.020 (0,50) min 0.217 (5,50) 0.748 (19,00) 0.748 (19,00) 0.689 (17,50) 0.098 (2,50) 0.433 (11,00) 0.335 (8,50) 0.610 (15,50) 0.650 (16,50) 1.260 (32,00) 0.905 (23,00) 0.234 (5,95) 0.266 (6,75) 0.512 (13,00) 0.488 (12,40) 0.114 (2,90) 0.094 (2,40) 0.146 (3,70) 0.169 (4,30) dia notes: a. all linear dimensions are in inches (millimeters). b. this drawing is subject to change without notice. c. tape and reel information for the format lead option package.

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