unisonic technologies co., ltd lm4041 preliminary linear integrated circuit www.unisonic.com.tw 1 of 7 copyright ? 2009 unisonic technologies co., ltd qw-r101-027.a precision micropower shunt voltage reference ? description as a shunt voltage reference integrated circuit, utc lm4041 can be used for widespread applications with enhancement of the competitive advantage by saving use of external capacitors.. in order to ensure a stable output voltage, the reference not only offers low dynamic impedance, low noise and a low temperature coefficient, but also provides tight output tolerance (max 1.0 %) and low temperature coefficient (150ppm/c). however, for those applications wh ich the output voltage needs to be adjusted between 1.225v and 10v, an external resistor divider is necessary. ? features * output tolerances and temperature coefficient: max 1.0%, 150 ppm/c * low output noise : 20 v rms (typ.) * operating current range : 45 a ~ 12ma * halogen free ? ordering information order number package packing LM4041G-XX-AE3-R sot-23 tape reel note: xx: output voltage, refer to marki ng information.
lm4041 preliminary linear integrated circuit unisonic technologies co., ltd 2 of 7 www.unisonic.com.tw qw-r101-027.a ? marking information package voltage code marking sot-23 ad: adj n4xx g 1 2 3 voltage code ? pin configuration ? pin description pin no. pin name description 1 cathode output reference voltage, cathode terminal 2 fb feedback terminal 3 anode output reference voltage, anode terminal
lm4041 preliminary linear integrated circuit unisonic technologies co., ltd 3 of 7 www.unisonic.com.tw qw-r101-027.a ? block diagram
lm4041 preliminary linear integrated circuit unisonic technologies co., ltd 4 of 7 www.unisonic.com.tw qw-r101-027.a ? absolute maximum rating (ta = 25c, unless otherwise specified.) parameter symbol ratings unit continuous cathode voltage v z 15 v continuous cathode current i z -10~+25 ma junction temperature t j 150 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 oper ation is not implied. ? thermal data parameter symbol ratings unit junction to ambient ja 206 c/w note: maximum power dissipation is a function of t j(max) , ja , and ta. the maximum allowable power dissipation at any allowable ambient temperature is p d = (t j(max) ? t a )/ ja . operating at the absolute maximum t j of 150c can affect reliability. ? recommended operating conditions parameter symbol ratings unit cathode current (max) i z 12 ma reverse breakdown voltage v z 10 v operating temperature ta -40~+85 c ? electrical characteristics ( ta =-40c~ +85c, unless otherwise specified.) parameter symbol test conditions min typ max unit reference voltage v ref v z =5v, i z = 100 a, ta=25c 1.233 v ta=25c -12 12 mv reference voltage tolerance (note) v z =5v, i z = 100 a ta =-40c~+85c -24 24 mv ta=25c 0.7 2 mv i z(min) < i z < 1ma ta=-40c~+85c 2.5 mv ta=25c 2 6 mv reference voltage change with cathode current change z ref i v 1ma < i z < 12ma ta=-40c~+85c 8 mv ta=25c -1.55 -2 mv/v reference voltage change with output voltage change ka ref v v i z =1ma ta=-40c~+85c -3 mv/v ta=25c 45 75 a minimum cathode current i z(min) ta =-40c~+85c 80 a ta=25c 60 150 na feedback current i fb ta=-40c~+85c 200 na v z =5v, i z =10ma, ta=25c 20 ppm/c ta=25c 15 ppm/c v z =5v, i z =1ma ta=-40c~+85c 150 ppm/c temperature coefficient of output voltage (note) t c v o v z =5v, i z =100 a, ta=25c 15 ppm/c v z =v ref, i z =1ma, i ac =0.1i z f=120hz, ta=25c 0.3 ? reverse dynamic impedance z z v z =10v, i z =1ma, i ac =0.1i z f=120hz, ta=25c 2 ? output voltage noise e n v z =v ref, i z =100 a 10hz f 10 khz, ta=25c 20 vrms long-term stability of reverse breakdown voltage t=1000h, i z =100 a, ta = 25c 0.1c, 120 ppm note: reference voltage tolerance and average temperature coefficient change with output voltage (v z ).
lm4041 preliminary linear integrated circuit unisonic technologies co., ltd 5 of 7 www.unisonic.com.tw qw-r101-027.a ? typical application circuit i r (+) (-) v 2v/step lm4041 (adj) reverse characteristics test circuit output capacitor across cathode and anode, there?s no need to use output capacitor for the utc lm4041 stability operation. pin connections there is a parasitic schottky diode connected betwe en cathode (pin 1) and anode (pin 3) .thus, pin 3 must be left floating or connected to pin 1.
lm4041 preliminary linear integrated circuit unisonic technologies co., ltd 6 of 7 www.unisonic.com.tw qw-r101-027.a ? application information v z is set according to the equation shown as below wh ich can be set by a user-defined resistor divider. v ref r1 r2 r s v s v z = v ref 1+ r2 r1 lm4041 adjustable shunt regulator cathode and load currents the total current available to supply the load (i l ) and bias the utc lm4041 (i z ) is set by r s , so its value must be set properly. in all cases, i z must stay in a specified range for proper operation of the reference; r s must be small enough to supply the minimum i z . at maximum v s and minimum i l , to limit i z to not exceed rating of 12 ma, rs must be large enough. r s = ) i (i ) v (v z l z s + ? r s v z lm4041 i z i z + i l i l v s shunt regulator
lm4041 preliminary linear integrated circuit unisonic technologies co., ltd 7 of 7 www.unisonic.com.tw qw-r101-027.a 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 written 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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