TL1431 Programmable voltage reference Datasheet - production data Features Adjustable output voltage: VREF to 36 V Sink current capability: 1 to 100 mA Typical output impedance: 0.22 0.4% and 0.25% voltage precision Automotive temp. range - 40 C to +125 C Description Z TO92 (Plastic package) 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 . September 2012 This is information on a product in full production. Doc ID 5286 Rev 5 D SO-8 (Batwing plastic micropackage) 1/18 www.st.com 18 Contents TL1431 Contents 1 Schematic diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 2 Absolute maximum ratings and operating conditions . . . . . . . . . . . . . 4 3 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 4 Parameter definitions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 4.1 Reference input voltage deviation over temperature range . . . . . . . . . . . 11 4.2 Temperature coefficient of reference input voltage . . . . . . . . . . . . . . . . . . 11 4.3 Dynamic impedance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 5 Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 6 Ordering information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 7 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 2/18 Doc ID 5286 Rev 5 TL1431 1 Schematic diagrams Schematic diagrams Figure 1. TO92 pin connections (top view) Cathode Anode Reference 1 Figure 2. 2 3 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 Figure 3. 2 3 4 TL1431 block diagram Cathode Vref + Vref Anode Doc ID 5286 Rev 5 3/18 Absolute maximum ratings and operating conditions 2 TL1431 Absolute maximum ratings and operating conditions Table 1. Absolute maximum ratings Symbol VKA Parameter Cathode to anode voltage Value Unit 37 V Ik Continuous cathode current range -100 to +150 mA Iref Reference input current range -0.05 to +10 mA Tj Junction temperature +150 C 625 960 mW (1) Pd Power dissipation TO92 SO-8 batwing Tstg Storage temperature range -65 to +150 C HBM: human body model (2) 2000 200 1500 V ESD MM: machine model (3) CDM: charged device model (4) 1. Calculated with Tj=+150C and Tamb=+25C 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 k 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 ). 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. Operating conditions Symbol VKA Ik 4/18 Parameter Value Unit Cathode to anode voltage Vref to 36 V Cathode current 1 to 100 mA Toper Operating free-air temperature range TL1431C/AC TL1431I/AI TL1431IY/AIY Rthja Thermal resistance junction to ambient SO-8 batwing TO92 Doc ID 5286 Rev 5 -20 to +70 -40 to +105 -40 to +125 130 200 C C/W TL1431 3 Electrical characteristics Electrical characteristics Tamb = 25 C (unless otherwise specified). Table 3. Electrical characteristics for TL1431C, TL1431AC TL1431C Symbol TL1431AC Parameter Unit Min. Typ. Max. Min. Typ. Max. Vref Reference input voltage - see Figure 4 VKA = Vref, Ik = 10 mA Vref Reference input voltage deviation over temperature range (1) - see Figure 4 VKA = Vref, Ik = 10 mA, Tmin Tamb Tmax 3 20 3 20 mV Temperature coefficient of reference input voltage(2) VKA = Vref, Ik = 10 mA, Tmin Tamb Tmax 13 90 13 90 ppm/C Vref ---------------T Vref ---------------Vka Ratio of change in reference input voltage to change in cathode to anode voltage - see Figure 5 Ik = 10mA - VKA = 36V to 3V 2.490 2.500 2.510 2.493 2.500 2.507 -2 -1.1 -2 -1.1 V mV/V Reference input current Ik = 10mA, R1 = 10k, R2 = Tmin Tamb Tmax 1.5 2.5 3 1.5 2.5 3 A Iref Reference input current deviation over temperature range Ik = 10mA, R1 = 10k, R2 =, Tmin Tamb Tmax 0.2 1.2 0.2 1.2 A Imin Minimum cathode current for regulation - Figure 4 VKA = Vref 0.5 1 0.5 0.6 mA Ioff Off-state cathode current - see Figure 6 180 500 180 500 nA 0.2 0.5 0.2 0.5 Iref (3) ZKA Dynamic impedance VKA = Vref, Ik = 1 to100mA, f 1kHz 1. See Reference input voltage deviation over temperature range in Section 4: Parameter definitions on page 11. 2. See Temperature coefficient of reference input voltage in Section 4: Parameter definitions on page 11. 3. See Dynamic impedance in Section 4: Parameter definitions on page 11. Doc ID 5286 Rev 5 5/18 Electrical characteristics TL1431 Tamb = 25 C (unless otherwise specified). Table 4. Electrical characteristics for TL1431I, TL1431AI TL1431I Symbol TL1431AI Parameter Unit Min. Typ. Max. Min. Typ. Vref Reference input voltage - see Figure 4 VKA = Vref, Ik = 10 mA Vref Reference input voltage deviation over temperature range (1) - see Figure 4 VKA = Vref, Ik = 10 mA, Tmin Tamb Tmax 7 30 7 Temperature coefficient of reference input voltage(2) VKA = Vref, Ik = 10 mA, Tmin Tamb Tmax 22 100 22 Vref ---------------T Vref ---------------Vka Ratio of change in reference input voltage to change in cathode to anode voltage - see Figure 5 Ik = 10mA - VKA = 36V to 3V Max. 2.490 2.500 2.510 2.493 2.500 2.507 -2 -1.1 -2 30 V mV 100 ppm/C -1.1 mV/V Reference input current Ik = 10mA, R1 = 10k, R2 = Tmin Tamb Tmax 1.5 2.5 3 1.5 2.5 3 A Iref Reference input current deviation over temperature range Ik = 10mA, R1 = 10k, R2 =, Tmin Tamb Tmax 0.5 1 0.8 1.2 A Imin Minimum cathode current for regulation - see Figure 4 VKA = Vref 0.5 1 0.5 0.7 mA Ioff Off-state cathode current - see Figure 6 180 500 180 500 nA 0.2 0.5 0.2 0.5 Iref (3) ZKA Dynamic impedance VKA = Vref, Ik= 1 to100mA, f 1kHz 1. See Reference input voltage deviation over temperature range in Section 4: Parameter definitions on page 11. 2. See Temperature coefficient of reference input voltage in Section 4: Parameter definitions on page 11. 3. See Dynamic impedance in Section 4: Parameter definitions on page 11. 6/18 Doc ID 5286 Rev 5 TL1431 Electrical characteristics Tamb = 25 C (unless otherwise specified). Table 5. Electrical characteristics for TL1431IY, TL1431AIY TL1431IY Symbol TL1431AIY Parameter Unit Min. Typ. Max. Min. Typ. Vref Reference input voltage - see Figure 4 VKA = Vref, Ik = 10 mA Vref Reference input voltage deviation over temperature range (1) - see Figure 4 VKA = Vref, Ik = 10 mA, Tmin Tamb Tmax 7 30 7 Temperature coefficient of reference input voltage(2) VKA = Vref, Ik = 10 mA, Tmin Tamb Tmax 22 100 22 Vref ---------------T Vref ---------------Vka Ratio of change in reference input voltage to change in cathode to anode voltage - see Figure 5 Ik = 10mA - VKA = 36V to 3V Max. 2.490 2.500 2.510 2.493 2.500 2.507 -2 -1.1 -2 30 V mV 100 ppm/C -1.1 mV/V Reference input current Ik = 10mA, R1 = 10k, R2 = Tmin Tamb Tmax 1.5 2.5 3 1.5 2.5 3 A Iref Reference input current deviation over temperature range Ik = 10mA, R1 = 10k, R2 =, Tmin Tamb Tmax 0.5 1 0.8 1.2 A Imin Minimum cathode current for regulation - see Figure 4 VKA = Vref 0.5 1 0.5 0.7 mA Ioff Off-state cathode current - see Figure 6 180 500 180 500 nA 0.2 0.5 0.2 0.5 Iref (3) ZKA Dynamic impedance VKA = Vref, Ik= 1 to100mA, f 1kHz 1. See Reference input voltage deviation over temperature range in Section 4: Parameter definitions on page 11. 2. See Temperature coefficient of reference input voltage in Section 4: Parameter definitions on page 11. 3. See Dynamic impedance in Section 4: Parameter definitions on page 11. Doc ID 5286 Rev 5 7/18 Electrical characteristics Figure 4. TL1431 Test circuit VKA = VREF Figure 5. Test circuit for VKA > VREF Input Input R Output R IK Output R1 IK=10mA VKA IREF R2 VKA VREF 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 VKA=36V 10F 10F Figure 8. Test circuit for response time Figure 9. Output 8.25k Input IK=10mA 15k IOFF VREF Reference voltage vs. temperature 1 mA 0 mA Output IK=1mA Reference voltage (V) 2.500 2.498 2.496 2.494 2.492 IK=10 mA VKA=VREF=2.5 V See figure 1 2.490 2.488 2.486 -40 -20 0 20 40 60 Temperature (C) 8/18 Doc ID 5286 Rev 5 80 100 120 TL1431 Electrical characteristics Figure 10. Reference voltage vs. cathode current Figure 11. Reference voltage vs. cathode current (IK = 0 to 1 mA) 3.0 Reference voltage (V) Reference voltage (V) 3 2 VKA=VREF See figure 1 1 0 2.5 2.0 VKA=VREF See figure 1 1.5 1.0 0.5 -1 -40 -20 0 20 40 60 80 0.0 0.0 100 0.2 0.4 Cathode current (mA) 0.6 Figure 12. Reference current vs. temperature 0.10 VKA = 36V See figure 3 0.08 IOFF (A) IREF (A) 1.5 1.0 IK=10 mA VKA=VREF See figure 1 0.5 -20 0 20 40 60 80 0.06 0.04 0.02 100 0.00 -40 120 -20 0 Temperature (C) 40 60 80 100 120 Figure 15. Drift of RKA vs. temperature 0.0 0.00 IK=10 mA VKA=VREF See figure 2 -0.5 IK=10 mA VKA=VREF= 2.5V see figure 1 -0.01 RKA ( ) VREF / VKA (mV / V) 20 Temperature(C) Figure 14. Ratio of change in VREF to change in VKA vs. temperature -1.0 -1.5 -2.0 -40 1.0 Figure 13. Off-state cathode current vs. temperature 2.0 0.0 -40 0.8 Cathode current (mA) -0.02 -0.03 -20 0 20 40 60 80 100 120 -0.04 -40 Temperature (C) -20 0 20 40 60 80 100 120 Temperature (C) Doc ID 5286 Rev 5 9/18 Electrical characteristics TL1431 Figure 16. Maximum operating current vs. temperature Figure 17. Gain and phase vs. frequency 0.52 200 60 IK=10 mA See figure 4 Gain 0.50 40 150 100 Gain (dB) IK=IMIN VKA=VREF See figure 1 0.46 50 Phase 20 0 0 -50 0.44 -100 -20 0.42 -150 0.40 -40 -40 -20 0 20 40 60 80 100 120 1 10 100 Frequency (kHz) Temperature (C) Figure 18. Stability behavior with capacitive loads Figure 19. Maximum power dissipation 100 100 TAMB= +25C 80 VKA=5V Stable Area Cathode current (mA) Cathode current (mA) VKA=VREF 60 Stable Area Instable Area VKA=12V 40 VKA=24V 0 1E-10 1E-8 1E-7 1E-6 1E-5 Figure 20. Pulse response for IK = 1 mA 6 Current step: 1 mA Voltage (V) TO92 40 4 TAMB=+25C See figure 6 Output voltage 2 0 1 2 3 Safe Area 10 20 Cathode voltage (V) Capacitive Load (F) 4 5 Time (s) 10/18 60 0 1E-9 SO8 Batwing 80 20 20 0 -200 10000 1000 Doc ID 5286 Rev 5 30 Phase () IMIN (mA) 0.48 TL1431 Parameter definitions 4 Parameter definitions 4.1 Reference input voltage deviation over temperature range Vref is defined as the difference between the maximum and minimum values obtained over the full temperature range. Vref = Vref max. - Vref min. Figure 21. Reference input voltage deviation over temperature range V ref max. V ref min. 4.2 Temperature T2 T1 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 pm Max 2.5V min /C C m/ p +n p Temperature 25C 4.3 Dynamic impedance The dynamic impedance is defined as |ZKA| = V KA --------------- IK Doc ID 5286 Rev 5 11/18 Package mechanical data 5 TL1431 Package mechanical data In order to meet environmental requirements, ST offers these devices in different grades of ECOPACK(R) packages, depending on their level of environmental compliance. ECOPACK(R) specifications, grade definitions and product status are available at: www.st.com. ECOPACK(R) is an ST trademark. 12/18 Doc ID 5286 Rev 5 TL1431 Package mechanical data Figure 23. SO-8 batwing package mechanical drawing 0016023_C Table 6. SO-8 batwing package mechanical data Dimensions Ref. Millimeters Min. Typ. A Inches Max. Min. Typ. 1.75 0.069 A1 0.10 A2 1.25 b 0.28 0.48 0.011 0.019 c 0.17 0.23 0.007 0.010 D 4.80 4.90 5.00 0.189 0.193 0.197 E 5.80 6.00 6.20 0.228 0.236 0.244 E1 3.80 3.90 4.00 0.150 0.154 0.157 e 0.25 Max. 0.004 0.010 0.049 1.27 0.050 h 0.25 0.50 0.010 0.020 L 0.40 1.27 0.016 0.050 k 1 8 1 8 ccc 0.10 Doc ID 5286 Rev 5 0.004 13/18 Package mechanical data TL1431 Figure 24. TO-92 ammopack and tape and reel package mechanical drawing A1 P T P A H W2 W0 W W1 H0 I1 H L1 H1 d D0 F1 F2 P2 P0 Table 7. TO-92 ammopack and tape and reel package mechanical data Millimeters Inches Dim. Min. Typ. Min. Typ. Max. AL 5.0 0.197 A 5.0 0.197 T 4.0 0.157 d 0.45 0.018 I1 2.5 P 11.7 12.7 13.7 0.461 0.500 0.539 PO 12.4 12.7 13 0.488 0.500 0.512 P2 5.95 6.35 6.75 0.234 0.250 0.266 F1/F2 2.4 2.5 2.8 0.094 0.098 0.110 h -1 0 1 -0.039 0 0.039 P -1 0 1 -0.039 0 0.039 W 17.5 18.0 19.0 0.689 0.709 0.748 W0 5.7 6 6.3 0.224 0.236 0.248 W1 8.5 9 9.75 0.335 0.354 0.384 0.098 W2 0.5 0.020 H 20 0.787 H0 15.5 16 H1 DO L1 14/18 Max. 16.5 0.610 0.630 25 3.8 4.0 4.2 11 Doc ID 5286 Rev 5 0.650 0.984 0.150 0.157 0.165 0.433 TL1431 Package mechanical data Figure 25. TO-92 bulk package mechanical drawing Table 8. TO-92 bulk package mechanical data Millimeters Inches Dim. Min. L Typ. Max. Min. 1.27 Typ. Max. 0.05 B 3.2 3.7 4.2 0.126 0.1457 0.1654 O1 4.45 5.00 5.2 0.1752 0.1969 0.2047 C 4.58 5.03 5.33 0.1803 0.198 0.2098 K 12.7 O2 0.407 0.0197 0.02 a 0.35 0.5 0.5 0.508 0.016 0.0138 Doc ID 5286 Rev 5 15/18 Ordering information TL1431 6 Ordering information Table 9. Order codes Order codes TL1431CD TL1431CDT Accuracy (%) Temperature range Package Packing SO-8 Tube or tape and reel 0.4 TL1431ACD TL1431ACDT 0.25 TL1431CZ TL1431CZT TL1431CZ-AP 0.4 1431C 1431AC - 20C, +70C TL1431C TO92 TL1431ACZ TL1431ACZT TL1431ACZ-AP 0.25 TL1431ID TL1431IDT 0.4 TL1431AID TL1431AIDT 0.25 TL1431IZ TL1431ZT TL1431IZ-AP 0.4 Bulk or Tape or Ammopack TL1431AC 1431I SO-8 Tube or tape and reel 1431AI -40C, + 105C TL1431I TO92 TL1431AIZ TL1431AIZT TL1431AIZ-AP 0.25 TL1431IYDT (1) 0.4 TL1431AIYDT Marking (1) TL1431AI -40C, + 125C 0.25 Bulk or Tape or Ammopack SO-8 (Automotive grade) 1431IY tape and reel 1431AIY 1. Qualification and characterization according to AEC Q100 and Q003 or equivalent, advanced screening according to AEC Q001 and Q 002 or equivalent. 16/18 Doc ID 5286 Rev 5 TL1431 7 Revision history Revision history Table 10. Document revision history Date Revision 01-Mar-2002 1 Initial release. 01-Nov-2005 2 PPAP references inserted in the datasheet seeTable 9: Order codes on page 16. 3 Minimum value for temperature range updated in Table 2: Operating conditions. Vref ---------------Minimum values added and maximum values deleted for Vka parameter in Table 4 in Section 3: Electrical characteristics. Package information for TO92 tape and reel updated, see Section 5: Package mechanical data. Format update. 11-Mar-2008 4 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. 11-Sep-2012 5 Added: feature Automotive temp. range - 40 C to +125 C on page 1. Updated: Table 9 on page 16. 25-Apr-2007 Changes Doc ID 5286 Rev 5 17/18 TL1431 Please Read Carefully: Information in this document is provided solely in connection with ST products. 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