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september 2009 doc id 7961 rev 2 1/11 11 ts2431 programmable shunt voltage reference features adjustable output voltage: 2.5 to 24 v precision selection at 25 c: 2%, 1% and 0.5% sink current capab ility: 1 to 100 ma industrial temperature range: -40 to +105 c performances compatible with industry- standard tl431 applications computers instrumentation battery chargers switch mode power supplies battery-operated equipment description the ts2431 is a programmable shunt voltage reference with guarantee d temperature stability over the entire temperature range of operation -40 to +105 c. the output voltage may be set to any value between 2.5 and 24 v with an external resistor bridge. available in a sot23-3 surface mount package, the device can be implemented in applications where space-saving is of utmost importance. l sot23-3l (plastic micropackage) pin connections (top view) 3 1 2 cathode reference anode ts2431 www.st.com
absolute maximum ratings and operating conditions ts2431 2/11 doc id 7961 rev 2 1 absolute maximum ratings and operating conditions table 1. absolute maximum ratings symbol parameter value unit vka cathode to anode voltage 25 v i k reverse breakdown current -100 to +150 ma i ref reference input current range -0.05 to +10 ma p d power dissipation (1) sot23-3 1. pd has been calculated with tamb = 25c, tjunction = 150c, rthjc = 110c/w and rthja = 340c/w for the sot23-3 package. 360 mw t std storage temperature -65 to +150 c esd human body model (hbm) (2) 2. human body model: a 100 pf capacit or is charged to the specified voltage, then discharged through a 1.5 k resistor between two pins of the device. this is done for all couples of connected pin combinations while the other pins are floating. 2kv machine model (mm) (3) 3. machine model: a 200 pf capacitor is charged to the specified voltage, then discharged directly between two pins of the device with no external series resistor (int ernal resistor < 5 ). this is done for all couples of connected pin combinations whil e the other pins are floating. 200 v t lead lead temperature (soldering, 10 seconds) 260 c table 2. operating conditions symbol parameter value unit v ka cathode to anode voltage v ref to 24 v i k cathode operating current (1) 1. maximum power dissipation must be strict ly observed to avoid damaging the component. 1 to 100 ma t oper operating free air temperature range -40 to +105 c
ts2431 electrical characteristics doc id 7961 rev 2 3/11 2 electrical characteristics table 3. electrical characteristics (tamb = 25 c unless otherwise specified) symbol parameter test condition min. typ. max. unit v ref reference input voltage v k =v ref , ik =10 ma 2.5 v ts2431 (2%) 2.45 2.55 ts2431a (1%) 2.475 2.525 ts2431b (0.5%) 2.488 2.512 | v ref | reference input voltage deviation over temperature v k =v ref , i k = 10 ma (1) (2) 0 c < t < +70 c 10 20 mv -40 c < t < +85 c 17 30 -40 c < t < +105 c 20 35 t c temperature coefficient (note 2) -40 c < t < +105 c 50 100 ppm/c i kmin minimum operating current t = 25 c 0.3 0.8 ma -40 c < t < +105 c 1 ratio of change in reference input voltage to change in cathode to anode voltage i k =10ma vka = 24 to 2.5 v 0.3 2 mv/v i ref reference input current i k =10ma, r1=10k , r2 = + (3) t = 25 c 0.5 2.5 a -40 c < t < +105 c 3 | i ref | reference input current deviation i k =10ma, r1=10k , r2 = + (3) -40 c < t < +105 c 0.4 1.2 a i off off-state cathode current v k =24v, v ref = gnd 10 500 na | z ka | reverse dynamic impedance v k =v ref i k = 1 to 50 ma, f < 10 khz 0.5 0.75 w e n wide band noise ik = 10 ma 10 hz < f < 10 khz 300 nv/ hz 1. limits are 100% production tested at 25 c. limits over temperature are gua ranteed through correlation and by design. 2. | v ref | is defined as the difference between the maximum and minimum values of v ref obtained over the full temperature range. 3. refer to figure 4: test circuit for vka = vref on page 4 . vref vk --------------- -
electrical characteristics ts2431 4/11 doc id 7961 rev 2 figure 1. reference voltage vs temperature figure 2. cathode voltage vs cathode current -40 -20 0 20 40 60 80 100 2.48 2.49 2.50 2.51 2.52 ik =10 ma vka = vref voltage reference (v) temperature (c) -0.10 -0.05 0.00 0.05 0.10 -1 0 1 2 3 vka = vref t=25c vka cathode voltage (v) ika cathode current (a) figure 3. reference input current vs temperature figure 4. test circuit for vka = vref -40 -20 0 20 40 60 80 100 0.00 0.25 0.50 0.75 1.00 ik=10ma r1=10k r2=+ reference input current (a) temperature (c) input vka vref ik output figure 5. cathode voltage vs cathode current figure 6. dynamic impedance vs frequency 0 100 200 300 400 0 1 2 3 t=-40c t=+25c t=+105c vka = vref vka cathode voltage (v) ik cathode current (a) 10 100 1000 10000 100000 1000000 0 1 2 3 4 5 vka=vref ik=1ma t=25c zka dynamic impedance (ohms) frequency (hz)
ts2431 electrical characteristics doc id 7961 rev 2 5/11 figure 7. off-state current vs temperature figure 8. ratio of change in reference input voltage to change in vka voltage vs temperature -40 -20 0 20 40 60 80 100 0.0 0.1 0.2 0.3 off-state current (a) temperature (c) -40-20 0 20406080100 0.0 0.1 0.2 0.3 0.4 vka=24 to 2.5v ik=10ma t=25c vref / vka (mv/v) temperature (c) figure 9. phase and gain vs frequency figure 10. test circuit for off-state current measurement vka=24v iof f figure 11. test circuit for vka > vref figure 12. test circuit for phase and gain measurement input ik vka = vref . (1+r1/r2) + iref . r1 vka r1 r2 iref vref
electrical characteristics ts2431 6/11 doc id 7961 rev 2 figure 13. pulse response at i k = 1 ma figure 14. pulse response at i k = 1 ma 0.0 0.5 1.0 1.5 2.0 0 2 4 6 ik= 0 to 1ma t=25c output voltage input voltage voltage (v) time (s) 0.0 0.5 1.0 1.5 2.0 0 2 4 6 ik= 1ma to 0 t=25c output voltage input voltage voltage (v) time (s) figure 15. stability boundary conditions figur e 16. test circuit for pulse response at ik = 1ma 1e-10 1e-9 1e-8 1e-7 1e-6 1e-5 0 20 40 60 80 100 stable area instable area vka=5 v vka=2.5 v vka=3 v cathode current (ma) capacitive load (f) ik=1ma output 2.5 k pulse generator f=100khz 0 to 5v intput figure 17. equivalent input noise vs frequency figure 18. block diagram 0.1 1 10 100 1000 0 50 100 150 200 250 300 vka=vref ik=1ma t=25c noise (nv / hz) frequency (khz)
ts2431 package information doc id 7961 rev 2 7/11 3 package information in order to meet environmental requirements, st offers these devices in different grades of ecopack ? packages, depending on their level of environmental compliance. ecopack ? specifications, grade definitions and product status are available at: www.st.com . ecopack ? is an st trademark.
package information ts2431 8/11 doc id 7961 rev 2 3.1 sot23-3 package information figure 19. sot23-3 package mechanical drawing table 4. sot23-3 package mechanical data dimensions ref. millimeters inches min. typ. max. min. typ. max. a 0.89 1.12 0.035 0.044 a1 0.01 0.10 0.0004 0.004 a2 0.88 0.95 1.02 0.035 0.037 0.040 b 0.30 0.50 0.012 0.020 c 0.08 0.20 0.003 0.008 d 2.80 2.90 3.04 0.110 0.114 0.120 e 2.10 2.64 0.083 0.104 e1 1.20 1.30 1.40 0.047 0.051 0.055 e 0.95 0.037 e1 1.90 0.075 l 0.40 0.50 0.60 0.016 0.020 0.024 l1 0.54 0.021 k0d 8d
ts2431 ordering information doc id 7961 rev 2 9/11 4 ordering information table 5. order codes order code temperature range package packing precision marking ts2431ilt -40 to +105c sot23-3 tape & reel 2% l285 ts2431ailt 1% l286 ts2431bilt 0.5% l287 ts2431iylt (1) sot23-3 (automotive grade) 2% l289 ts2431aiylt (1) 1% l290 TS2431BIYLT (1) 0.5% l291 1. qualification and characterization according to aec q100 and q003 or equiva lent, advanced screening according to aec q001 & q 002 or equivalent are on-going.
revision history ts2431 10/11 doc id 7961 rev 2 5 revision history table 6. document revision history date revision changes 01-feb-2002 1 initial release. 10-sep-2009 2 updated document format. modified footnote 1 under table 1: absolute maximum ratings on page 2 . added hbm and mm notes under ta bl e 1 . added automotive grade order codes in table 5: order codes .
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