unisonic technologies co., ltd m385 preliminary linear integrated circuit www.unisonic.com.tw 1 of 6 copyright ? 2011 unisonic technologies co., ltd qw-r101-028.c micropower voltage reference ? description the utc m385 is a micropower voltage reference. this device features good temperature st ability and extreme low dynamic impedance when it is operated over a 10 a to 20ma current. low noise and good long-term stability are achieved because the utc m385 bandgap reference applies only bipolar transistors and resistors. the utc m385 can be used in almost any reference application due to the exceptional tolerance of capacitive loading. this voltage reference can be applied in portable meters, regulators, or general-purpose analog circuitry with battery life approaching shelf life. the wide dynamic operating range contributes to its use with widely varying supplies with excellent regulation. the low power drain of the utc m385 is useful for micropower circuitry. on-chip trimming gives it the tight voltage tolerance. furthermore, the wide operating current can replace older references with a tighter tolerance. the utc m385 can be used in such applications, for example, portable and battery-powered equipm ent, instrumentation, process control, energy management, product te sting, automotiv e, precision audio components, and so on. ? features * initial tolerance: 1% * operating current range:10 a~20ma * low temperature coefficient * low voltage reference ? ordering information ordering number lead free halogen free package packing M385L-XX-S08-R m385g-xx-s08-r sop-8 tape reel note: xx: output voltage, refer to marki ng information.
m385 preliminary linear integrated circuit unisonic technologies co., ltd 2 of 6 www.unisonic.com.tw qw-r101-028.c ? marking information package voltage code marking sop-8 12: 1.2v 25: 2.5v utc m385 xx date code voltage code lot code g: halogen free l: lead free ? pin connections + 8 7 6 5 1 2 3 4 - nc nc nc nc nc nc ? pin descriptions pin no. pin name pin function 1 nc not connected 2 nc not connected 3 nc not connected 4 - pin-sources current for normal application, the current value is the same as pin+ 5 nc not connected 6 nc not connected 7 nc not connected 8 + sinks current with a range from 20 a to 20ma for normal applications, a stable positive voltage, relative to pin-, occurs on pin-
m385 preliminary linear integrated circuit unisonic technologies co., ltd 3 of 6 www.unisonic.com.tw qw-r101-028.c ? block diagram
m385 preliminary linear integrated circuit unisonic technologies co., ltd 4 of 6 www.unisonic.com.tw qw-r101-028.c ? absolute maximum ratings parameter symbol ratings unit reverse current i r 30 ma forward current i f 10 ma junction temperature t j 125 c operating temperature t opr -40 ~ +85 c storage temperature t stg -65 ~ +150 c note: absolute maximum ratings are those values be yond which the device could be permanently damaged. absolute maximum ratings are stress ratings only and functional device operation is not implied. ? electrical characteristics (ta=25 c , unless otherwise specified.) m385-1.2v parameter symbol conditions min typ max unit reverse breakdown voltage v r i r =100 a 1.222 1.235 1.248 v 10 a < i r < 1ma 1 mv reverse breakdown voltage charge with current v r 1ma < i r < 20ma 20 mv reverse dynamic impedance z r i r =100 a ,f=20hz 1 ? minimum operating current i r(min) 8 15 a wideband noise e n i r =100 a,10hz f 10khz 60 vrms average temperature coefficient v r i r =100 a 100 ppm/c long term stability t v r i r =100 a, t=1000hrs, ta=25c 20 ppm m385-2.5v parameter symbol conditions min typ max unit reverse breakdown voltage v r i r =100 a 2.475 2.5 2.525 v 10 a < i r < 1ma 1 mv reverse breakdown voltage charge with current v r 1ma < i r < 20ma 20 mv reverse dynamic impedance z r i r =100 a ,f=20hz 1 ? minimum operating current i r(min) 8 15 a wideband noise e n i r =100 a,10hz f 10khz 60 vrms average temperature coefficient v r i r =100 a 100 ppm/c long term stability t v r i r =100 a, t=1000hrs, ta=25c 20 ppm
m385 preliminary linear integrated circuit unisonic technologies co., ltd 5 of 6 www.unisonic.com.tw qw-r101-028.c ? test circuit v in r s i r utc m385-xx v ref ? application circuits 3 2 -30v 7 4 r1 c 150pf r2 100k utc m385-xx i out v in (note 1) 6 1 ref out r v = i 3 2 30v 7 4 r1 c 150pf r2 100k utc m385-xx i out v in (note 2) 6 1 ref out r v = i precision 1a to 1ma current source 9v r 1 v ref (note 3) micropower reference from 9v battery reference from 1.5v battery (only for m385-1.2v) notes: 1. v ref =1.235v, -2.3v v+ -27v, v ref =2.5v, -3.7 v+ - 27v 2. v ref =1.235v, 2.3v v+ 27v, v ref =2.5v, 3.7 v+ 27v 3. v ref =1.235v, r1=900k ? , v ref =2.5v, r1=220k ?
m385 preliminary linear integrated circuit unisonic technologies co., ltd 6 of 6 www.unisonic.com.tw qw-r101-028.c utc assumes no responsibility for equipment failures that result from using products at values that exceed, even momentarily, rated values (such as maximum ratings, operating condition ranges, or other parameters) listed in products specifications of any and all utc products described or contained herein. utc products are not designed for use in life support appliances, devices or systems where malfunction of these products can be reasonably expected to result in personal injury. reproduction in whole or in part is prohibited without the prior writ ten consent of the copyright owner. the information presented in this document does not form part of any quotation or contract, is believed to be accurate and reliable and may be changed without notice.
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