TL1431_08

TL1431 Programmable voltage reference Features ■ ■ ■ ■ Adjustable output voltage: VREF to 36 V Sink current capability: 1 to 100 mA Typical output impedance: 0.22 Ω 0.4% and 0.25% voltage precision Description The TL1431 is a programmable shunt voltage reference with guaranteed temperature stability over the entire operating temperature range. The output voltage may be set to any value between 2.5 V and 36 V with two external resistors. The TL1431 operates with a wide current range from 1 to 100 mA with a typical dynamic impedance of 0.2 Ω. Z TO92 (Plastic package) D SO-8 (Batwing plastic micropackage) March 2008 Rev 4 1/16 www.st.com 16 Schematic diagrams TL1431 1 Schematic diagrams Figure 1. TO92 pin connections (top view) Cathode Anode Reference 1 2 3 Figure 2. SO-8 pin connections (top view) 8 7 6 5 1 - Cathode 2 - Anode 3 - Anode 4 - N.C. 5 - N.C. 6 - Anode 7 - Anode 8 - Reference 1 2 3 4 Figure 3. TL1431 block diagram Cathode Vref + Vref Anode 2/16 TL1431 Absolute maximum ratings and operating conditions 2 Absolute maximum ratings and operating conditions Table 1. Symbol VKA Ik Iref Tj Pd Tstg Absolute maximum ratings Parameter Cathode to anode voltage Continuous cathode current range Reference input current range Junction temperature Power dissipation TO92 SO-8 batwing (1) Value 37 -100 to +150 -0.05 to +10 +150 625 960 -65 to +150 2000 200 1500 Unit V mA mA °C mW °C Storage temperature range HBM: human body model (2) ESD MM: machine model (3) (4) V CDM: charged device model 1. Calculated with Tj=+150°C and Tamb=+25°C with relative Rthja depending on the package. 2. Human body model: A 100 pF capacitor is charged to the specified voltage, then discharged through a 1.5 kΩ resistor between two pins of the device. This is done for all couples of connected pin combinations while the other pins are floating. 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 (internal resistor < 5 Ω). This is done for all couples of connected pin combinations while the other pins are floating. 4. Charged device model: all pins and the package are charged together to the specified voltage and then discharged directly to the ground through only one pin. This is done for all pins. Table 2. Symbol VKA Ik Toper Operating conditions Parameter Cathode to anode voltage Cathode current Operating free-air temperature range TL1431C/AC TL1431I/AI Thermal resistance junction to ambient SO-8 batwing TO92 Value Vref to 36 1 to 100 -20 to +70 -40 to +105 130 200 Unit V mA °C Rthja °C/W 3/16 Electrical characteristics TL1431 3 Table 3. Symbol Electrical characteristics Tamb = 25°C (unless otherwise specified) TL1431C Parameter Min. Vref Reference input voltage - see Figure 4 VKA = Vref , Ik = 10 mA Reference input voltage deviation over temperature range (1) - see Figure 4 VKA = Vref, Ik = 10 mA, Tmin ≤ Tamb ≤ Tmax Temperature coefficient of reference input voltage(2) VKA = Vref, Ik = 10 mA, Tmin ≤Tamb ≤ Tmax Ratio of change in reference input voltage to change in cathode to anode voltage - see Figure 5 Ik = 10mA - ΔVKA = 36V to 3V Reference input current , Ik = 10mA, R1 = 10kΩ R2 = ∞ Tmin ≤ Tamb ≤ Tmax Reference input current deviation over temperature range , , Ik = 10mA, R1 = 10kΩ R2 =∞ Tmin ≤ Tamb ≤ Tmax Minimum cathode current for regulation - Figure 4 VKA = Vref Off-state cathode current - see Figure 6 Dynamic impedance VKA = Vref , ΔIk = 1 to100mA, f ≤ 1kHz (3) TL1431AC Unit Max. Min. Typ. Max. V Typ. 2.490 2.500 2.510 2.493 2.500 2.507 ΔVref Δ Vref --------------ΔT 3 20 3 20 mV ±13 ±90 ±13 ±90 ppm/°C Δ Vref --------------Δ Vka -2 -1.1 -2 -1.1 mV/V Iref 1.5 2.5 3 1.2 1.5 2.5 3 1.2 µA ΔIref 0.2 0.2 µA Imin Ioff ⏐ ZKA⏐ 0.5 180 0.2 1 500 0.5 0.5 180 0.2 0.6 500 0.5 mA nA Ω 1. See Reference input voltage deviation over temperature range in Section 4: Parameter definitions on page 9. 2. See Temperature coefficient of reference input voltage in Section 4: Parameter definitions on page 9. 3. See Dynamic impedance in Section 4: Parameter definitions on page 9. 4/16 TL1431 Table 4. Symbol Electrical characteristics Tamb = 25°C (unless otherwise specified) TL1431I Parameter Min. Typ. Max. Min. Typ. Max. V Reference input voltage - see Figure 4 VKA = Vref , Ik = 10 mA Reference input voltage deviation over temperature range (1) - see Figure 4 VKA = Vref, Ik = 10 mA, Tmin ≤ Tamb ≤ Tmax Temperature coefficient of reference input voltage(2) VKA = Vref, Ik = 10 mA, Tmin ≤ Tamb ≤ Tmax Ratio of change in reference input voltage to change in cathode to anode voltage - see Figure 5 Ik = 10mA - ΔVKA = 36V to 3V Reference input current , Ik = 10mA, R1 = 10kΩ R2 = ∞ Tmin ≤ Tamb ≤ Tmax Reference input current deviation over temperature range , , Ik = 10mA, R1 = 10kΩ R2 =∞ Tmin ≤ Tamb ≤ Tmax Minimum cathode current for regulation - see Figure 4 VKA = Vref Off-state cathode current - see Figure 6 Dynamic impedance (3) VKA = Vref , ΔIk= 1 to100mA, f ≤ 1kHz TL1431AI Unit Vref 2.490 2.500 2.510 2.493 2.500 2.507 ΔVref Δ Vref --------------ΔT 7 30 7 30 mV ±22 ±100 ±22 ±100 ppm/°C Δ Vref --------------Δ Vka -2 -1.1 -2 -1.1 mV/V Iref 1.5 2.5 3 1 1.5 2.5 3 1.2 µA ΔIref 0.5 0.8 µA Imin Ioff ⏐ ZKA⏐ 0.5 180 0.2 1 500 0.5 0.5 180 0.2 0.7 500 0.5 mA nA Ω 1. See Reference input voltage deviation over temperature range in Section 4: Parameter definitions on page 9. 2. See Temperature coefficient of reference input voltage in Section 4: Parameter definitions on page 9. 3. See Dynamic impedance in Section 4: Parameter definitions on page 9. 5/16 Electrical characteristics TL1431 Figure 4. Test circuit for VKA = VREF Figure 5. Input Test circuit for VKA = VREF R IK Output Input R IK=10mA Output R1 IREF VKA VKA VREF R2 VREF R1 VKA = VREF ( 1 + ------- ) + R1 x IREF R2 Figure 6. Test circuit for IOFF Figure 7. Test circuit for phase margin and voltage gain 10μF IK=10mA VKA=36V IOFF 10μF 15kΩ 8.25kΩ Output Input VREF Figure 8. Test circuit for response time Figure 9. 2.500 2.498 2.496 2.494 2.492 2.490 2.488 2.486 -40 Reference voltage vs. temperature IK=1mA 1 mA 0 mA Reference voltage (V) Output IK=10 mA VKA=VREF=2.5 V See figure 1 -20 0 20 40 60 80 100 120 Temperature (°C) 6/16 TL1431 Electrical characteristics Figure 10. Reference voltage vs. cathode current 3 Figure 11. Reference voltage vs. cathode current 3.0 2.5 2.0 1.5 1.0 0.5 Reference voltage (V) 2 1 VKA=VREF See figure 1 Reference voltage (V) VKA=VREF See figure 1 0 -1 -40 -20 0 20 40 60 80 100 0.0 0.0 0.2 0.4 0.6 0.8 1.0 Cathode current (mA) Cathode current (mA) Figure 12. Reference current vs. temperature 2.0 Figure 13. Off-state cathode current vs. temperature 0.10 0.08 1.5 IREF (µA) IOFF (µA) 0.06 VKA = 36V See figure 3 1.0 0.04 0.5 IK=10 mA VKA=VREF See figure 1 0.02 0.0 -40 -20 0 20 40 60 80 100 120 0.00 -40 -20 0 20 40 60 80 100 120 Temperature (°C) Temperature(°C) Figure 14. Ratio of change in VREF to change in VKA vs. temperature 0.0 Figure 15. Drift of RKA vs. temperature 0.00 ΔVREF / ΔVKA (mV / V) -0.5 IK=10 mA VKA=VREF See figure 2 Δ RKA (Ω ) -0.01 IK=10 mA VKA=VREF= 2.5V see figure 1 -1.0 -0.02 -1.5 -0.03 -2.0 -40 -20 0 20 40 60 80 100 120 -0.04 -40 -20 0 20 40 60 80 100 120 Temperature (°C) Temperature (°C) 7/16 Electrical characteristics TL1431 Figure 16. Maximum operating current vs. temperature 0.52 0.50 Figure 17. Gain and phase vs. frequency 60 Gain 40 IK=10 mA See figure 4 200 150 100 0.48 IMIN (mA) 0.46 0.44 -100 -20 IK=IMIN VKA=VREF See figure 1 Gain (dB) 20 Phase 50 Phase (°) 0 0 -50 0.42 0.40 -40 -40 1 10 100 Frequency (kHz) 1000 -150 -200 10000 -20 0 20 40 60 80 100 120 Temperature (°C) Figure 18. Stability behavior with capacitive loads 100 Figure 19. Maximum power dissipation VKA=VREF Cathode current (mA) Cathode current (mA) 100 TAMB= +25°C SO8 Batwing 80 VKA=5V 60 Stable Area Instable Area Stable Area 80 60 TO92 40 Safe Area VKA=12V VKA=24V 40 20 20 0 1E-10 0 1E-9 1E-8 1E-7 1E-6 1E-5 10 20 Cathode voltage (V) 30 Capacitive Load (F) Figure 20. Pulse response for IK = 1 mA 6 Current step: 1 mA Voltage (V) 4 TAMB=+25°C See figure 6 Output voltage 2 0 0 1 2 Time (µs) 3 4 5 8/16 TL1431 Parameter definitions 4 Parameter definitions Reference input voltage deviation over temperature range ΔVref is defined as the difference between the maximum and minimum values obtained over the full temperature range. ΔVref = Vref max. - Vref min. Figure 21. Reference input voltage deviation over temperature range V ref max. V ref min. T1 T2 Temperature Temperature coefficient of reference input voltage The temperature coefficient is defined as the slopes (positive and negative) of the voltage versus temperature limits within which the reference is guaranteed. Figure 22. Temperature coefficient of reference input voltage -n p Max 2.5V min pm /°C p +n p m/° C Temperature 25°C Dynamic impedance KA The dynamic impedance is defined as | ZKA| = --------------Δ IK ΔV 9/16 Package information TL1431 5 Package information In order to meet environmental requirements, ST offers these devices in ECOPACK® packages. These packages have a lead-free second level interconnect. The category of second level interconnect is marked on the package and on the inner box label, in compliance with JEDEC Standard JESD97. The maximum ratings related to soldering conditions are also marked on the inner box label. ECOPACK is an ST trademark. ECOPACK specifications are available at: www.st.com. 10/16 TL1431 Package information 5.1 SO-8 batwing package information Figure 23. SO-8 batwing package mechanical drawing Table 5. SO-8 batwing package mechanical data Dimensions Ref. Min. Millimeters Typ. Max. Min. Inches Typ. Max. A A1 A2 b c D E E1 e h L k ccc 0.25 0.40 1° 0.10 1.25 0.28 0.17 4.80 5.80 3.80 4.90 6.00 3.90 1.27 1.75 0.25 0.004 0.049 0.48 0.23 5.00 6.20 4.00 0.011 0.007 0.189 0.228 0.150 0.193 0.236 0.154 0.050 0.50 1.27 8° 0.10 0.010 0.016 1° 0.069 0.010 0.019 0.010 0.197 0.244 0.157 0.020 0.050 8° 0.004 11/16 Package information TL1431 5.2 TO92 (ammopack and tape and reel) package information Figure 24. TO-92 ammopack and tape and reel package mechanical drawing A1 P P T H d A H1 H0 H I1 W2 W1 W W0 L1 D0 F1 F2 P2 P0 Table 6. Dim. TO-92 ammopack and tape and reel package mechanical data Millimeters Min Typ. Max. Min. Inches Typ. Max. AL A T d I1 P PO P2 F1/F2 Δh ΔP 5.0 5.0 4.0 0.45 2.5 11.7 12.4 5.95 2.4 -1 -1 17.5 5.7 8.5 12.7 12.7 6.35 2.5 0 0 18.0 6 9 13.7 13 6.75 2.8 1 1 19.0 6.3 9.75 0.5 20 15.5 16 16.5 25 3.8 4.0 4.2 11 0.150 0.157 0.610 0.630 0.098 0.461 0.488 0.234 0.094 -0.039 -0.039 0.689 0.224 0.335 0.500 0.500 0.250 0.098 0 0 0.709 0.236 0.354 0.018 0.197 0.197 0.157 0.539 0.512 0.266 0.110 0.039 0.039 0.748 0.248 0.384 0.020 0.787 0.650 0.984 0.165 0.433 W W0 W1 W2 H H0 H1 DO L1 12/16 TL1431 Package information 5.3 TO92 (bulk) package information Figure 25. TO-92 bulk package mechanical drawing Table 7. Dim. TO-92 bulk package mechanical data Millimeters Min Typ. Max. Min. Inches Typ. Max. L B O1 C K O2 a 3.2 4.45 4.58 12.7 0.407 0.35 1.27 3.7 5.00 5.03 4.2 5.2 5.33 0.126 0.1752 0.1803 0.5 0.5 0.508 0.016 0.0138 0.05 0.1457 0.1969 0.198 0.1654 0.2047 0.2098 0.0197 0.02 13/16 Ordering information TL1431 6 Ordering information Table 8. Order codes Temperature range Package Packing Marking Order code TL1431CD TL1431CDT SO-8 TL1431ACD TL1431ACDT TL1431CZ TL1431CZT TL1431CZ-AP TL1431ACZ TL1431ACZT TL1431ACZ-AP TL1431ID TL1431IDT SO-8 TL1431AID TL1431AIDT TL1431IZ TL1431ZT TL1431IZ-AP TL1431AIZ TL1431AIZT TL1431AIZ-AP TL1431IYD(1) TL1431IYDT(1) SO-8 (Automotive grade) -20°C, +70°C 1431C Tube or tape and reel 1431AC TL1431C TO92 Bulk or Tape or Ammopack TL1431AC 1431I Tube or tape and reel 1431AI -40°C, + 105°C TO92 TL1431I Bulk or Tape or Ammopack TL1431AI Tube or tape and reel 1431IY 1. Qualification and characterization according to AEC Q100 and Q003 or equivalent, advanced screening according to AEC Q001 and Q 002 or equivalent are on-going. 14/16 TL1431 Revision history 7 Revision history Table 9. Date Document revision history Revision Changes 01-Mar-2002 01-Nov-2005 1 2 Initial release. PPAP references inserted in the datasheet seeTable 8: Order codes on page 14. Minimum value for temperature range updated in Table 2: Operating conditions. Δ Vref --------------Minimum values added and maximum values deleted for Δ Vka parameter in Table 4 in Section 3: Electrical characteristics. Package information for TO92 tape and reel updated, see Section 5: Package information. Format update. Corrected SO-8 package mechanical data. Corrected footnote for automotive grade order codes in order code table. Corrected packing information for TO92 devices in order code table. 25-Apr-2007 3 11-Mar-2008 4 15/16 TL1431 Please Read Carefully: Information in this document is provided solely in connection with ST products. STMicroelectronics NV and its subsidiaries (“ST”) reserve the right to make changes, corrections, modifications or improvements, to this document, and the products and services described herein at any time, without notice. All ST products are sold pursuant to ST’s terms and conditions of sale. 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