1 date: 1/19/05 spx4040 micropower 2.5v shunt voltage reference ? copyrigh t 2005 sipex corporation precision micropower 2.5v shuntvoltage reference the spx4040 is a 2-terminal, temperature compensated, bandgap voltage reference that provides a fixed 2.5v output for input currents between 160 a and 15ma. the bandgap voltage (2.5v) is independently trimmed from the output voltage to achive a very low temperature coefficient. this trimming technique gives a stable device over the full temperature range (100ppm/ c). the spx4040 is available in 3 pin to-92, 3 sot-23 and 8 pin nsoic packages. the operating temperature range is -40 c to 85 c. the spx4040 advanced design eliminates the need for an external stabilizing capacitor while ensuring stability with any capacitive load, making it easy to use. spx4040 ? features trimmed bandgap to 0.5% and 1% wide operating current 160 a to 15ma extended temperature range: -40 c to 85 c low temperature coefficient 100 ppm/ c replacement in for lm4040 applications battery operating equipment adjustable supplies switching power supplies error amplifiers description anode (a) cathode (k) 2.5v + - r r typical applications circuit single supply amplifier monitors / vcrs / tvs personal computers now available in lead free packaging 1 2 3 4 5 6 7 8 spx4040 8 pin nsoic cathode n/c anode n/c n/c n/c n/c n/c
2 date: 1/19/05 spx4040 micropower 2.5v shunt voltage reference ? copyrigh t 2005 sipex corporation absolute maximum ratings anode-cathode forward current, (<10ms) i ak ............................. 10ma anode-cathode reverse current i ka ........................................... 20ma continuous power dissipation at 25 c p d to-92 ..................................................................... 550mw sot-23 .................................................................. 300 mw soic-8 .................................................................... 525mw junction temperature t j ........................................................... 150 c storage temperature t stg .............................................. -65 to 150 c note: stresses greater than those listed under absolute maximum ratings may cause permanent damage to the device. this is a stress rating only and functional operation of the device at these or any other conditions above those indicated in the operational sections of this specification is not implied. exposure to absolute maximum rating condi- tions for extended periods may affect reliability. typical thermal resistances package 0 ja 0 jc typical derating to-92 160 c/w 80 c/w 6.3 mw/ c sot-23 575 c/w 150 c/w 1.7 mw/ c soic-8 175 c/w 45 c/w 5.7 mw/ c typical deratings of the thermal resistances are given for ambient temperature >25 c. parameters conditions min typ max min typ max units spx4040a-2.5 spx4040-2.5 reverse breakdown i r = 500 a 2.4875 2.500 2.5125 2.475 2.500 2.525 v voltage reverse breakdown i r = 500 a 12 25 mv tolerance -40 c < t a < 85 c 29 49 mv output impedance 0.60 0.8 0.60 0.8 ? noise voltage 0.1khz f 10hz 15 15 v p-p tempco note 1 100 100 ppm/ c turn-on setting 1.0% of v out 30 30 sec operating current range note 2 0.16 15 0.16 15 ma temp. range (ambient) -40 85 -40 85 c 075 85 -10 0.5 5000 0 00 0.07 mv/ c 0.003 %/ c 27 ppm/ c tc in mv/ c= tc in % / c= (mv) ? t a ? t a at 25 c x 100 () tc in ppm/ c= at 25 c x10 6 () ppm % mv junction temperature ( c) ? t ? v ka ? v ka ? v ka ? v ka ? v ka ? v ka ? t a 15 45 60 30 calculating average temperature coefficient (tc) figure 1. v ka vs temperature. notes: 1. three-point measurement guarantees the error band over the specified temperature range. 2. optimum performance is obtained at current below 1000 a. electrical characteristics at i n = 1000 a and t a = +25 c unless otherwise specified . electrical characteristics
3 date: 1/19/05 spx4040 micropower 2.5v shunt voltage reference ? copyrigh t 2005 sipex corporation typical performance characteristics v in v ka i k -2 -1 0 1 2 3 150 125 100 75 50 25 0 -25 -50 -75 -100 v ka cathode voltage (v) i k cathode current (ma) v ka = 2.5v 0 c to 85 c figure 2. test circuit for i kreverse, v ka = 2.5v figure 3. high current operating characteristics -1.0 0 1.0 2.0 3.0 270 240 210 180 150 120 90 60 30 0 -30 -60 v ka cathode voltage (v) i k cathode current ( a) v ka = 2.5v 0 to 105 c 105 c 25 c -0 c figure 4. low current operating characteristics figure 5. noise voltage vs frequency z ka dynamic impedance ( ? ) t a - free air temperature v ka = 2.5v i ka = 1 to 15ma f 1khz 0.150 0.125 0.100 0.075 0.050 0.025 0.0 -60 -30 0 30 60 85 figure 7. frequency = 100khz, i k = 10ma, t a = 25 c v out v in noise voltage nv/ hz f frequency (hz) v ka = 2.5v i k = 10ma t a = 25 c 70 60 50 40 30 20 10 0 10 100 1k 10k 100k figure 6. low frequency dynamic output impedance vs. t ambient
4 date: 1/19/05 spx4040 micropower 2.5v shunt voltage reference ? copyrigh t 2005 sipex corporation figure 10. off state leakage i k v out gnd 250 ? 50 ? v in f p = 100khz figure 8. test circuit for pulse response t a =25 c i k = 1 to 15ma z ka dynamic impedance ( ? ) f frequency (hz) 100 10 1.0 0.1 0.01 1k 10k 100k 1m 10m figure 9. dynamic output impedance t a = 25 c, i k = 1 to 15ma 0.01 0.1 1 10 100 -50 0 50 100 150 t a ambient temperature ( c) i koff cathode current v ka = 2.5v application information this device is designed for stable operation and has no need of an external capacitor between pins 4 and 8. the reference remains stable if a bypass capacitor is used. sot-23 the spx4040 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 11), an external series resistor (r s ) is connected between the supply voltage and the spx4040. 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 spx4040 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 ) typical performance characteristics
5 date: 1/19/05 spx4040 micropower 2.5v shunt voltage reference ? copyrigh t 2005 sipex corporation v s rs i q + i l spx4040 v out i l i q v r lm4250c 1m v in = 15v 10v + _ 1.17m 3.5m 22m 150pf 7 8 6 4 3 2 i q spx4040-2.5 i q ? 2 a standby current figure 11. spx4040 fixed shunt regulator application figure 12. micropower 10v reference lm312 r1 100k ? + r2 c1 150pf 7 6 4 3 2 spx4040-2.5 30v i out * 2.5v to 27v * i out = 5.0v r2 3k 3.0v spx4040-2.5 2.5v figure 13. precision 1 a to ma current source figure 14. reference from 3.0v battery 4.3k v in = 3.3v to 30v spx4040-2.5 2.5v lm334 figure 15. wide input range reference typical performance characteristics
6 date: 1/19/05 spx4040 micropower 2.5v shunt voltage reference ? copyrigh t 2005 sipex corporation package: 8 pin nsoic a a1 a2 side view seating plane section b-b with plating symbol min nom max a 1.35 - 1.75 a1 0.1 - 0.25 a2 1.25 - 1.65 b 0.31 - 0.51 c 0.17 - 0.24 d e e1 e l 0.4 - 1.27 l1 l2 ?0o-8o ?1 5o - 15o note: dimensions in (mm) 8 pin nsoic jedec mo-012 (aa) variation 4.90 bsc 6.00 bsc 3.90 bsc 1.27 bsc 1.04 ref 0.25 bsc gauge plane l1 l ? 1 ? seating plane l2 view c to p view b see view c b b e e/2 e1 index area (d/2 x e1/2) e1/2 d 1 e c base metal b
7 date: 1/19/05 spx4040 micropower 2.5v shunt voltage reference ? copyrigh t 2005 sipex corporation package: 3 pin sot-23 a a2 a1 side view a a seating plane c c with plating base metal b e e1 e e1 d b 1 2 3 l1 l gauge plane view c see view c b b section b-b view a-a seating plane symbol min nom max a0.89- 1.12 a1 0.01 - 0.1 a2 0.88 0.95 1.02 b0.3 -0.5 c0.08-0.2 d2.82. 93.04 e e1 e0.95- 2.64 e1 1.2 1.3 1.4 l0.40. 50.6 l1 ?0o-8o note: dimensions in (mm) 3 pin sot-23 jedec to-236 (ab) variation 0.95 bsc 1.90 bsc 0.54 ref
8 date: 1/19/05 spx4040 micropower 2.5v shunt voltage reference ? copyrigh t 2005 sipex corporation package: 3 pin to-92 d w l e1 e b a s1 a (2x) e r symbol min nom max a0.17- 0.195 b0. 014 - 0.02 e0.13- 0.155 e0.95- 0.105 e1 0.045 - 0.055 l0.5-0 .61 r0. 085 - 0.095 s1 0.045 - 0.06 w0. 016 - 0.022 d0. 175 - 0.195 a4o-6o note: dimensions in (inches) 3 pin to-92
9 date: 1/19/05 spx4040 micropower 2.5v shunt voltage reference ? copyrigh t 2005 sipex corporation corporation analog excellence sipex corporation reserves the right to make changes to any products described herein. sipex does not assume any liability aris ing out of the application or use of any product or circuit described herein; neither does it convey any license under its patent rights nor t he rights of others. sipex corporation headquarters and sales office 233 south hillview drive milpitas, ca 95035 tel: (408) 934-7500 fax: (408) 935-7600 part number acc output voltage packages spx4040am-2.5 .................. 0.5% ....................... 2.5v ........................... 3-pin sot-23 spx4040am-2.5/tr ............ 0.5% ....................... 2.5v ........................... 3-pin sot-23 spx4040an-2.5 .................. 0.5% ....................... 2.5v ............................. 3-pin to-92 spx4040an-2.5/tr ............ 0.5% ....................... 2.5v ............................. 3-pin to-92 spx4040as-2.5 .................. 0.5% ....................... 2.5v ............................ 8-pin nsoic spx4040as-2.5/tr ............ 0.5% ....................... 2.5v ............................ 8-pin nsoic spx4040m-2.5 .................... 1.0% ....................... 2.5v ........................... 3-pin sot-23 spx4040m-2.5/tr .............. 1.0% ....................... 2.5v ........................... 3-pin sot-23 spx4040n-2.5 .................... 1.0% ....................... 2.5v ............................. 3-pin to-92 spx4040n-2.5/tr .............. 1.0% ....................... 2.5v ............................. 3-pin to-92 spx4040s-2.5 ..................... 1.0% ....................... 2.5v ............................ 8-pin nsoic spx4040s-2.5/tr ............... 1.0% ....................... 2.5v ............................ 8-pin nsoic available in lead free packaging. to order add "-l" suffix to part number. example: spx4040s-2.5/tr = standard; spx4040s-l-2.5/tr = lead free /tr = tape and reel pack quantity is 2,000 for to-92, 2,500 for nsoic and sot-23. top v iew bottom view to -92 (n) 1 3 2 n/c t op view 2 1 3 4 8 7 6 5 8-pin soic (s) n/c n/c n/c + n/c n/c - 1 2 3 + - + - sot-23-3 (m) ordering information package pinouts click here to order samples
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