njm1431a -1- ver.2007-02-07 adjustable high precision shunt regulator general description package outline features operating voltage v ref to 36v precision voltage reference 2.465v1% 2.9mm 1.5mm to mtp (sot23) package adjustable output voltage bipolar technology package outline sot-89 (3pin), mtp5 block diagram pin configuration the njm1431a is a precision shunt regulator. compared to the conventional 431, the njm1431a offer s higher voltage accuracy and small package availability t o support a wide range of applications. a node reference v ref cathode 1. reference 2. anode 3. cathode 123 njm1431au cathode anode reference nc 1 2 3 5 4 nc NJM1431AF NJM1431AF njm1431au
njm1431a - 2 - ver.2007-02-07 absolute maximum ratings (ta=25c) parameter symbol maximum ratings unit cathode voltage v ka +37 v continuous cathode current i k -100 ~ 150 ma reference input current i ref -0.05 ~ 10 ma power dissipation p d (sot-89) 350 (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 ? 36 v cathode current i k 1 ? 100 ma electrical characteristics (i k =10ma, ta=25 c) parameter symbol test condition min. typ. max. unit reference voltage v ref v ka =v ref (*1) 2.440 2.465 2.490 v v ref v ka 10v (*2) ? 1.4 2.7 mv/v reference voltage change vs. cathode voltage change ? v ref / ? v ka 10v v ka 36v (*2) ? 1.0 2.0 mv/v reference input current i ref r1=10k ? , r2= (*2) ? 2 4 ua minimum input current i min v ka =v ref , ? v ref =1% (*1) ? 0.4 1.0 ma cathode current (off cond.) i off v ka =36v, v ref =0v (*3) ? 0.1 1.0 ua dynamic impedance z ka v ka = v ref , f 1khz 1ma i k 100ma (*1) ? 0.2 0.5 ? temperature characteristics (i k =10ma, ta= -40 c ~ 85 c) parameter symbol test condition min. typ. max. unit reference voltage change ? v ref v ka =v ref (*1) ? 8 17 mv reference input current change ? i ref r1=10k ? , r2= (*2) ? 0.4 1.2 ua the maximum value of ?dynamic impedance?, ?reference voltage change? and ?reference input current change? are determined based on sampling evaluation from the 5 initial production lots, and thus not tested in the production test. therefore, these values are for the reference design purpose only. v ref reference voltage includes error. (*1): test circuit (fig.1) (*2): test circuit (fig.2) (*3): test circuit (fig.3)
njm1431a - 3 - ver.2007-02-07 test circuit fig.1 v ka =v ref to test circuit fig.2 v ka >v ref to test circuit fig.3 i off to test circuit v o =v ka =v ref 1 r i 2 r 1 r 1 v v v ref ref ka o + ? ? ? ? ? ? + = = power dissipation vs. ambient temperature 0 100 200 300 400 500 0 25 50 75 100 ambient temperature ta (c) power dissipation p d (mw) sot-89 mtp5 input v ka i k v ref input v ka i k v ref i ref r1 r2 input v ka i off
njm1431a - 4 - ver.2007-02-07 typical characteristics 2.4 2.42 2.44 2.46 2.48 2.5 0.1 1 10 100 reference voltage vs. cathode current (v ka =v ref , ta=25 o c) cathode current i k (ma) reference voltage v ref (v) 2.44 2.45 2.46 2.47 2.48 2.49 -50 -25 0 25 50 75 100 125 150 ambient temperature ta ( o c) reference voltage v ref (v) reference voltage vs. temperature (v ka =v ref , i k =10ma) 0 0.5 1 1.5 2 -50 -25 0 25 50 75 100 125 150 ambient temperature ta ( o c) reference input current i ref (ua) reference input current vs. temperature (i k =10ma, r1=10k ? , r2= ) 8 2.44 2.45 2.46 2.47 2.48 2.49 010203040 reference voltage vs. cathode voltage (i k =10ma, r1=variable, r2=10k ? , ta=25 o c) cathode voltage v ka (v) reference voltage v ref (v) 0 20 40 60 80 100 0.01 0.1 1 10 unstable operaion region safety operating boundary condition (v ka =v ref , c out =ceramic capacitor, ta=25 o c) output capacitor c out (uf) cathode current i k (ma) stable operaion region 0 0.1 0.2 0.3 0.4 0.5 0.001 0.01 0.1 1 10 100 dynamic impedance (i k =1 to 100ma, v ka =v ref , ta=25 o c) cathode current frequency f (khz) dynamic impedance |z ka | ( ? ) note) oscillation might occur while operating within the rang e of safety curve. so that, it is necessary to make ample margins b y taking considerations of fluctuation of the device.
njm1431a - 5 - ver.2007-02-07 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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