njm2820 , NJM2821 , njm2822 ver 2.2 -1- adjustable high precision shunt regulator general description package outline features high precision voltage reference 1.250v0.7% flow soldering* minimum input current 80ua typ. operating voltage v ref to 13v adjustable output voltage bipolar technology package outline mtp5 block diagram pin configuration * these contents are based on the result that evaluated the arbitrary sample. the characteristic is not guaranteed. the design and reliability that fully considered flow mounting are checked but the influence by temperature profile etc. is also considered. p lease consult with sales representatives for a recommendation temperature profile. the njm2820 / 2821 / 2822 is a 1.25v precision shun t regulator. high precision voltage accuracy of 0.7%* is realized b y the total optimization from chip design to packaging. in addition, it features low cathode current of 80ua for lo w current operation. it is suitable for ac-dc converter secondary circuit, reference voltage applications for a/d and d/a converters, and other applications where precision reference is required. njm2820f NJM2821f njm2822f a node reference v ref cathode njm2820f NJM2821f cathode anode reference nc 1 2 3 5 4 nc cathode anode reference nc 1 2 3 5 4 nc njm2822f reference cathode anode 1 2 3 5 4 nc anode
njm2820 , NJM2821 , njm2822 - 2 - absolute maximum ratings (ta=25c) parameter symbol maximum ratings unit cathode voltage v ka 14 v continuous cathode current i k -30 50 ma reference input current i ref -10 0.05 ma power dissipation p d (mtp5) 200 mw operating temperature range t opr -40 +85 c storage temperature range t stg -40 +150 c recommended operating conditions (ta=25c) parameter symbol min. typ. max. unit cathode voltage v ka v ref ? 13 v cathode current i k 0.5 ? 30 ma electrical characteristics (i k =1ma,ta=25c) parameter symbol test condition min. typ. max. unit reference voltage v ref v ka =v ref (*1) 1241 1250 1259 mv v ref v ka 5v (*2) ? ? 2.7 mv/v reference voltage change vs. cathode voltage change ? v ref / ? v ka 5v v ka 13v (*2) ? ? 2.0 mv/v reference input current i ref r1=10k ? , r2= (*2) ? 2.0 4.0 ua minimum input current i min v ka =v ref , ? v ref =1% (*1) ? 80 500 ua cathode current (off cond.) i off v ka =13v, v ref =0v (*3) ? 0.01 1.0 ua dynamic impedance z ka v ka = v ref , f 1khz 0.5ma i k 30ma (*1) ? 0.12 ? ? temperature characteristics (i k =1ma,ta=-40c 85c) parameter symbol test condition min. typ. max. unit reference voltage change ? v ref v ka =v ref (*1) ? 10 ? mv reference input current change ? i ref r1=10k ? ,r2= (*2) ? 0.5 ? ua v ref reference voltage includes error. (*1): test circuit (fig.1) (*2): test circuit (fig.2) (*3): test circuit (fig.3) in case of njm2822, all electrical characteristics are measured referencing to the anode terminal of pin 5.
njm2820 , NJM2821 , njm2822 - 3 - test circuit fig.1 v ka =v ref to test circuit fig.2 v ka >v ref to test circuit v o =v ka =v ref 1 r i 2 r 1 r 1 v v v ref ref ka o + ? ? ? ? ? ? + = = fig.3 i off to test circuit fig.4 gain and phase to test circuit power dissipation vs. ambient temperature 0 50 100 150 200 250 0 255075100 ambient temperature ta (c) power dissipation p d (mw) input v ka i k v ref i k =1ma 10k ? 10k ? 470uf input v ka i k v ref i ref r1 r2 input v ka i off
njm2820 , NJM2821 , njm2822 - 4 - typical characteristics dynamic impedance (i k =0.5~30ma,v ka =v ref ,ta=25c) 0 0.2 0.4 0.6 0.8 1 1.2 1 10 100 1k 10k 100k cathode current frequency f (hz) dynamic impedance |z ka | ( ? ) reference voltage vs. cathode current (v ka =v ref ,ta=25c) 1240 1245 1250 1255 1260 0102030 cathode current i k (ma) reference voltage v ref (mv) reference voltage vs. cathode current (v ka =v ref ,ta=25c) 600 800 1000 1200 1400 0 20406080100 cathode current i k (ua) reference voltage v ref (mv) reference voltage change vs. cathode voltage (i k =1ma,r1=variable,r2=10k ? ,ta=25c) 0 1 2 3 4 0 5 10 15 cathode voltage v ka (v) reference voltage change ? v ref (mv) cathode current (off cond.) vs. cathode voltage (v ref =0v,ta=25c) 0 0.2 0.4 0.6 0.8 1 0 5 10 15 cathode voltage v ka (v) cathode current i off (na) voltage gain phase vs. frequency (fig.4 test circuit,ta=25c) -80 -60 -40 -20 0 20 40 60 80 100 1k 10k 100k 1m 10m frequency f (hz) voltage gain a v (db) -360 -270 -180 -90 0 90 180 270 360 phase (deg) gain phase
njm2820 , NJM2821 , njm2822 - 5 - typical characteristics sefty operating boundary condition (v ka =v ref ,ta=25c) 0 50 100 150 200 250 0.001 0.01 0.1 1 10 output capacetance co (uf) cathode current i k (ua) stable operaion region unstable operaion region reference input current vs. temperature (i k =1ma,r1=10k ? ,r2= ) 1.5 2 2.5 3 -50 -25 0 25 50 75 100 125 150 ambient temperature ta (c) reference input current i ref (ua) reference voltage vs. temperature (i k =1ma,v ka =v ref ) 1240 1245 1250 1255 1260 -50 -25 0 25 50 75 100 125 150 ambient temperature ta (c) reference voltage v ref (mv) cathode current (off cond.) vs. temperature (v ka =13v,v ref =0v) 0 0.2 0.4 0.6 0.8 1 -50 -25 0 25 50 75 100 125 150 ambient emperature ta (c) cathode current i off (ua) output noise voltage vs. temperature (i k =1ma,v ka =v ref ) 0 20 40 60 80 100 120 140 -50 -25 0 25 50 75 100 125 150 ambient temperature ta (c) output noise voltage v no (uvrms) note) oscillation might occur while operating within the range of safety curve. so that, it is necessary to make ample margins by taking considerations of fluctuation of the device.
njm2820 , NJM2821 , njm2822 - 6 - memo [caution] the specifications on this databook are only given for information , without any guarantee as regards either mistakes or omissions. the application circuits in this databook are described only to show representative usages of the product and not intended for the guarantee or permission of any right including the industrial rights.
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