rev. 10/11/00 as4040 precision micropower 2.5v shunt voltage reference features applications ? low temperature coefficient 100 ppm/c ? constant current source ? operating current range 100 a to 15 ma ? digital voltmeter ? low power, 250 mw @ iin=100 ma ? power supply monitor ? two terminal "zener" operation ? precision regulators ? small package: sot - 23, to-92, and so-8 ? battery-powered equipment ? fixed reverse breakdown voltage 2.5 volt ? instrumentation ? no output capacitance required ? automotive electronics ? similar replacement for lm4040 ? data acquisition systems ? energy management product description the as4040 is a two-terminal, temperature compensated, band-gap voltage reference, which provides a fixed 2.5v output for input currents between 100 a to 15ma. the bandgap voltage (2.5v) is independently trimmed from the output voltage to achieve a very low tempco. this trimming technique process gives a very stable device over the full temperature range (a grade 50 ppm/ c). the as4040 is available in the sub-miniature (3mm 1.3mm) sot-23, so-8 surface mount package, or to-92 package. the operating temperature is -40c to 85c. the as4040 advanced design eliminates the need for an external stabilized capacitor while insuring stability with any capacitiv e load, making them easy to use. ordering information part number package type as4041yn-x to-92 as4041ys-x so-8 as4041ym-x sot-23 note: consult factory for lower tempco and tolerance. pin connections temperature coef. output accuracy reverse breakdown voltage 2.5 = 2.5v 5.0 = 5.0v top view 2 1 3 4 8 7 6 5 8-pin surface mount (s) sot-23-3 (m) top view 2 3 + - 1 bottom view to-92 (n) 1 3 2 n/c n/c n/c - n/c n/c n/c + 1=0.5% 2=1% 3=2 % a=100ppm/ c b=150ppm/ c y= x= v=
rev. 10/11/00 as4040 absolute maximum ratings reverse current................................................................20ma power dissipation at 25 c forward current ...............................................................10ma m package .................................. .................... 300mw storage temperature ...................................... -65 c to +150 c n package ....................................................... 550mw lead temperature (soldering) ........................................ 300 c s package........................................................ 525mw temperature range ................................... -40 c t a +85 c electrical characteristics (as4040-2.5v) electrical characteristics at i in = 1000 a, and t a = +25c unless otherwise noted. . boldface limits apply over temperature parameters conditions as4040a-2 min typ max as4040b-2 min typ max units reverse breakdown voltage i r =500 a 2.500 2.500 v reverse breakdown tolerance i r =500 a 25 49 25 49 mv mv output impedance 0.60 2 0.60 2 ? noise voltage 0.1khz f 10hz 15 15 v p-p tempco note 1 50 100 ppm/ c turn-on setting 0.1% of v out 30 30 sec operating current range note 2 0.1 15 0.1 15 ma temp . range -40 85 -40 85 c parameters conditions as4040a-3 min typ max as4040b-3 min typ max units reverse breakdown voltage i r =500 a 2.500 2.500 v reverse breakdown tolerance i r =500 a 50 74 50 74 mv mv output impedance 0.60 2 0.60 2 ? noise voltage 0.1khz f 10hz 15 15 v p-p tempco note 1 50 100 ppm/ c turn-on setting 0.1% of v out 30 30 sec operating current range note 2 0.1 15 0.1 15 ma temp. range -40 85 -40 85 c
rev. 10/11/00 as4040 electrical characteristics (as4040-5.0v) electrical characteristics at i in = 1000 a, and t a = +25c unless otherwise noted. . boldface limits apply over temperature parameters conditions as4040a-1 min typ max as4040b-1 min typ max as4040c-1 min typ max units reverse breakdown voltage i r =500 a 5.000 5.000 5.000 v reverse breakdown tolerance i r =500 a 24 58 24 58 24 58 mv mv output impedance 0.60 0.3 2 0.9 0.60 0.3 2 1.1 0.60 0.3 2 1.1 ? noise voltage 0.1khz f 10hz 15 15 15 v p-p tempco note 1 100 150 150 ppm/ c turn-on setting 0.1% of v out 30 30 30 sec operating current range note 2 0.175 15 0.175 15 0.175 15 ma temp. range -40 85 -40 85 -40 85 c parameters conditions as4040a-2 min typ max as4040b-2 min typ max as4040c-2 min typ max units reverse breakdown voltage i r =500 a 5.000 5.000 5.000 v reverse breakdown tolerance i r =500 a 50 98 50 98 50 98 mv mv output impedance 0.60 2 0.60 2 0.60 2 ? noise voltage 0.1khz f 10hz 15 15 15 v p-p tempco note 1 50 100 150 ppm/ c turn-on setting 0.1% of v out 30 30 30 sec operating current range note 2 0.175 15 0.175 15 0.175 15 ma temp . range -40 85 -40 85 -40 85 c parameters conditions as4040a-3 min typ max as4040b-3 min typ max as4040c-3 min typ max units reverse breakdown voltage i r =500 a 5.000 5.000 5.000 v reverse breakdown tolerance i r =500 a 100 148 100 148 100 148 mv mv output impedance 0.60 2 0.60 2 0.60 2 ? noise voltage 0.1khz f 10hz 15 15 15 v p-p tempco note 1 50 100 150 ppm/ c turn-on setting 0.1% of v out 30 30 30 sec operating current range note 2 0.175 15 0.175 15 0.175 15 ma temp. range -40 85 -40 85 -40 85 c note: 1) three-point measurement guarantees the error band over the specified temperature range. 2) optimum performance is obtained at currents below 1000 a. 3) limits are 100% production tested at 25 c. limits over temperature are guaranteed through correlation using statistical quality control.
rev. 10/11/00 as4040 as4040 applications hints this device is designed for stable operation and has no need of an external capacitor between pin 4 and 8. the reference remains stable if a bypass capacitor is used. sot-23 the as4040 in the sot-23 package has a parasitic schottky diode between pin 3 and pin 1. pin 1 of sot-23 must float or be connected to pin 3. conventional shunt regulator in a conventional shunt regulator application (see figure 1), an external series resister (r s ) is connected between the supply voltage and the as4040. r s determines the current that flows through the load (i l ) and the reference(i q ). since load current and supply voltage may vary, r s should be small enough to supply at least the minimum acceptable i q to the reference even when the supply voltage is at its minimum and the load current is at its maximum value. when the supply voltage is at its maximum and i l is at its minimum, r s should be large enough so that the current flowing through the as4040 is less than 15ma r s is determined by the supply voltage (v s ), the load and operating current (i l and i q ), reference?s reverse breakdown voltage (v r ). r s = (v s - v r )/(i l +i q ) figure 1. as4040 fixed shunt regulator application v s r s v r i l i q i o + i l v o as4040
rev. 10/11/00 as4040 package drawing 8-pin soic (s) pin 1 1.27 (0.50) bsc 3.8 (0.150) 4.0 (0.158) 4.6 (0.181) 5.2 (0.205) 5.8 (0.228) 6.2 (0.244) 4.8 (0.188) 5.0 (0.197) 0.49 (0.019) 0.56 (0.022) 0.35 (0.014) 0.45 (0.018) 0.10 (0.004) 0.20 (0.008) 0.19 (0.007) 0.22 (0.009) 1.35 (0.053) 1.75 (0.069) 0.61 (0.024) 0.78 (0.031) 3 -6 0.64 (0.025) 0.77 (0.030) 45 7 (4 plcs) 7 (4 plcs) 0.37 (0.015) bsc
rev. 10/11/00 as4040 drawing package sot-23-3l (m) 0.015 - 0.018 (0.381 - 0.457) 0.020 - 0.024 (0.508 - 0.610) 0.110 - 0.120 (2.794 - 3.048) 0.001 - 0.004 (0.025 - 0.102) 0.030 - 0.041 (0.762 - 1.041) 0.018 - 0.024 (0.457 - 0.610) 0.070 - 0.080 (1.778 - 2.032) 0.035 - 0.040 (0.889 - 1.016) 0.047 - 0.055 (1.194 - 1.397) 0.083 - 0.098 (2.108 - 2.489) 0.003 - 0.005 (0.076 - 0.127)
rev. 10/11/00 as4040 package drawing to-92 (n) 1 2 3 0.055 (1.397) 0.045 (1.143) 0.145 (3.683) 0.135 (3.429) 10 typ. bottom view 0.185 (4.699) 0.045 (1.143) 0.185 (4.699) 0.175 (4.445) 0.085 (2.159) diameter 0.090 (2.286) typ. seating plane 0.016 (0.406) 0.014 (0.356) 0.055 (1.397) 0.045 (1.143) 0.105 (2.667) 0.095 (2.413) 0.500 (12.70) min. 0.025 (0.635) max uncontrolled lead diameter 5 typ. 5 typ. 0.090 (2.286) radius typ. 0.0155 (0.3937) 0.0145 (0.3683)
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