bay linear, inc 2418 armstrong street, livermore, ca 94550 tel: (925) 606-5950, fa x: (925) 940-9556 www.baylinear.com precision micro power voltage reference b4041 pin connection ordering information devices package temp. b4041yz-x to-92 -40 c to +85 c b4041ym-x so-8 -40 c to +85 c b4041yk-x sot-23 -40 c to +85 c y= a=100ppm/ c b=150ppm/ c x= 1=0.5% 2=1% 3=2% description the b4041 is a two-terminal , temperature compensated, band-gap voltage reference, which provides a fixed 1.25v output for input currents between 500 a to 5ma. the bandgap voltage (1.225v) is independently laser trimmed from the output voltage to achieve a very low tempco, then the output voltage is laser trimmed to 1.225 volts. this trimming technique and the low tempco (a grade 50 ppm/ c) thin film resistor process gives a very stable device over the full temperature range. the b4041 is ava ilable in the sub-miniature (3mm 1.3mm) sot-23, so-8 surface mount package, or to-92 package. the oper ating temperature is -40c to 85c. the bay linear b4041 advan ced design eliminates the need for an external stabili zed capacitor while insuring stability with any capacitive load, making them easy to use. features ? low temp. coefficient 50 ppm/ ? c ? operating current rang e of 100a to 15ma ? low power 250mw @i in =100ma ? small package: sot-23, to-92, so-8 ? output voltage tolerance of 0.5% ? similar replacement for lm4041 applications ? constant current source ? digital voltmeter ? power supply monitor ? battery powered equipment ? data acquisition systems ? energy management bay linear inspire the linear power 1 2 3 45 6 7 8 _ nc + nc nc nc nc nc top view 8-pin surface mount 1 2 bottom view to-92 plastic package 3 front view 2 3 + _ 1 sot-23
bay linear, inc 2418 armstrong street, livermore, ca 94550 tel: (925) 606-5950, fa x: (925) 940-9556 www.baylinear.com b4041 absolute maximum ratings reverse current ............................................................... 20ma po wer dissipation at 25 c forward current .............................................................. 10ma k package??????300mw storage temperature....................................... -65 c to +150 c z package??????.550mw lead temperature temperature range?-40 c t a +85 c k package .......................................................+215 c z package ........................................................+260 c electrical characteristics electrical characteristics at i in = 1000 a, and t a = +25c unless otherwise noted. . boldface limits apply over temperature. parameter condition b4041a-1 min type max b4041b-1 min type max b4041c-1 min type max unites rev; brek. voltage i r =500 a 1.25 1.25 1.25 v rev. brek tolerance i r =500 a 12 29 12 29 12 29 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 note 2 0.1 5 15 0.1 5 15 0.1 5 15 ma temp. range -40 85 -40 85 -40 85 c parameter condition b4041a-2 min type max b4041b-2 min type max b4041c-2 min type max unites rev; brek. voltage i r =500 a 1.25 1.25 1.25 v rev. brek tolerance i r =500 a 25 49 25 49 25 49 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 note 2 0.5 5 15 0.5 5 15 0.5 5 15 ma temp. range -40 85 -40 85 -40 85 c
bay linear, inc 2418 armstrong street, livermore, ca 94550 tel: (925) 606-5950, fa x: (925) 940-9556 www.baylinear.com b4041 electrical characteristics parameter condition b4041a-3 min type max b4041b-3 min type max b4041c-3 min type max unites rev; brek. voltage i r =500 a 1.25 1.25 1.25 v rev. brek tolerance i r =500 a 50 74 50 74 50 74 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 vout 30 30 30 sec operating current note 2 0.1 5 15 0.1 5 15 0.1 5 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 gu aranteed through correlation using b4041 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 b4041 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 su pply voltage and the b4041. 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 b4041-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 ) v s r s v r i l i q i o + i l v o as4041 tt
bay linear, inc 2418 armstrong street, livermore, ca 94550 tel: (925) 606-5950, fa x: (925) 940-9556 www.baylinear.com advance information - these data sheets contain descriptions of products that are in development. the specifications are based on the engineering ca lculations, computer simulations and/ or initial prototype evaluation. preliminary information - these data sheets contain minimum and maxi mum specifications that are based on the initial device characterizations. these lim its are subject to change upon the completion of the full characterization over the specif ied temperature and supply voltage ranges. the application circuit examples are only to explain the repres entative applications of the de vices and are not intended to gua rantee any circuit design or permit any industrial property ri ght to other rights to execute. bay linear takes no responsibility for any problems related to any industrial property right resulting from the use of the contents shown in the da ta book. typical parameters can and do vary in different applications. customer?s technical experts must validate all operating parameters including ? typical? for each customer applic ation. life support and nuclear policy bay linear products are not authorized fo r and should not be used within life suppor t systems which are intended for surgical implants into the body to support or sustain life, in aircraft, space equipment, submarine, or nuclear facility applications wi thout the specific written consent of bay linear president.
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