rev. 10/11/00 AS4041 precision micropower 1.24v shunt voltage reference features applications ? low temperature coefficient 50 ppm/c ? constant current source ? operating current range 100 a to 15 ma ? digital voltmeter ? low power, 250 mw @ i in =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 ? output voltage tolerance 0.5% ? data acquisition systems ? energy management product description the AS4041 is a two-terminal, temperature compensated, band-gap voltage reference, which provides a fixed 1.24v output for inpu t currents between 500 a to 5ma. the bandgap voltage (1.24v) is independently laser trimmed from the output voltage to achieve a very low tempco, then the output voltage is laser trimmed to 1.24 volts. this trimming technique and the low tempco (a grade 5 0 ppm/ c) thin film resistor process gives a very stable device over the full temperature range. the AS4041 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 alpha semiconductor AS4041 advanced design eliminates the need for an external stabilized capacitor while insuring stabilit y with any capacitive load, making them easy to use. ordering information part number package type AS4041yn-x to-92 AS4041ys-x so-8 AS4041ym-x sot-23 1. for lower tempco, consult factory y= a=100ppm/ c b=150ppm/ c x= 2=1% 3=2% pin connections tem p co output accuracy 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 +
rev. 10/11/00 AS4041 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 electrical characteristics at i in = 1000 a, and t a = +25c unless otherwise noted. . boldface limits apply over temperature. parameters conditions AS4041a-2 min typ max AS4041b-2 min typ max units reverse breakdown voltage i r =500 a 1.24 1.24 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 0.5 5 15 0.5 5 15 ma temp. range -40 85 -40 85 c parameters conditions AS4041a-3 min typ max AS4041b-3 min typ max units reverse breakdown voltage i r =500 a 1.24 1.24 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 5 15 0.1 5 15 ma temp. range -40 85 -40 85 c
rev. 10/11/00 AS4041 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. AS4041 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 AS4041 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 AS4041. 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 AS4041-x.x 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. AS4041 fixed shunt regulator application v s r s v r i l i q i o + i l v o AS4041
rev. 10/4/00 AS4041 drawing package 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. 10/4/00 AS4041 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. 10/4/00 AS4041 drawing package 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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