TL1431

TL1431 Programmable Voltage Reference ■ ■ ■ ■ Adjustable output voltage: VREF to 36V Sink current capability: 1 to 100mA Typical output impedance: 0.22Ω 0.4% and 0.25% voltage precision Z TO92 (Plastic Package) Description The TL1431 is a programmable shunt voltage reference with guaranteed temperature stability over the entire temperature range of operation. The output voltage may be set to any value between 2.5V and 36V with two external resistors. The TL1431 operates with a wide current range from 1 to 100mA with a typical dynamic impedance of 0.2Ω. D SO-8 (Batwing Plastic Micropackage) Order Codes Part Number TL1431CD/CDT SO-8 TL1431ACD/ACDT TL1431CZ/CZT/CZ-AP TL1431ACZ/ACZT/ACZAP TL1431ID/IDT SO-8 TL1431AID/AIDT TL1431IZ/IZT/IZ-AP TL1431AIZ/AIZT/AIZ-AP TL1431IYD/IYDT SO-8 (automotive grade level) -40, + 105°C TO92 TL1431AI 1431IY 1431AI TL1431I -20, +70°C TO92 TL1431AC Tube or Tape & Reel 1431I 1431AC TL1431C Temperature Range Package Packing Marking 1431C November 2005 Rev 2 1/13 www.st.com 13 Pin Diagrams TL1431 1 Pin 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 2/13 TL1431 Absolute Maximum Ratings 2 Absolute Maximum Ratings Table 1. Symbol VKA Ik Iref TJ Pd Tstg Key parameters and their absolute maximum ratings Parameter Cathode to Anode Voltage Continuous Cathode Current Range Reference Input Current Range Junction temperature Power Dissipation (1) TO92 SO-8 batwing Storage Temperature Range 625 960 -65 to +150 mW Value 37 -100 to +150 -0.05 to +10 +150 Unit V mA mA °C °C 1. Calculated with TJ=+150°C and TAMB=+25°C with relative RTHJ-A depending on the package 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 -200 to +70 -40 to +105 °C Value Vref to 36 1 to 100 Unit V mA RTHJ-A SO 8 Batwing TO92 130 200 °C/W 3/13 Electrical Characteristics TL1431 3 Table 3. Symbol Electrical Characteristics Tamb = 25°C (unless otherwise specified) TL1431C Parameter Min. Vref Reference Input Voltage - figure 1 VKA = Vref , Ik = 10 mA Reference Input Voltage Deviation Over Temperature Range (1) - figure 1 VKA = Vref, Ik = 10 mA, Tmin ≤Tamb ≤ Tmax 3 20 3 20 2.490 2.500 2.510 2.493 2.500 2.507 Typ. Max. Min. Typ. Max. V TL1431AC Unit ∆Vref mV ∆ Vref --------------∆T 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 - figure 2 Ik = 10mA - ∆VKA = 36V to 3V Reference Input Current Ik = 10mA, R1 = 10k Ω, 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 1 VKA = Vref Off-State Cathode Current - figure 3 Dynamic Impedance (3) ppm/°C ±13 ±90 ±13 ±90 ∆ Vref --------------∆ Vka Iref mV/V -2 -1.1 -2 -1.1 µA 1.5 2.5 3 1.5 2.5 3 ∆Iref µA 0.2 1.2 0.2 1.2 mA nA Ω Imin Ioff ⏐ZKA⏐ 0.5 180 1 500 0.5 180 0.6 500 VKA = Vref , ∆ Ik = 1 to100mA, f ≤1kHZ 0.2 0.5 0.2 0.5 1. ∆Vref is defined as the difference between the maximum and minimum values obtained over the full temperature range. ∆Vref = Vref max. - Vref min. V ref max. V ref min. T1 T2 Temperature 2. The temperature coefficient is defined as the slopes (positive and negative) of the voltage vs temperature limits within which the reference is guaranteed. -n ppm Max 2.5V min /°C +n p pm/° C Temperature 25°C 3. The dynamic Impedance is definied as |ZKA| = ∆ VKA ---------------∆ IK 4/13 TL1431 Table 4. Symbol Electrical Characteristics Tamb = 25°C (unless otherwise specified) TL1431I Parameter Min. Typ. Max. Min. Typ. Max. V Reference Input Voltage - figure 1 VKA = Vref , Ik = 10 mA Reference Input Voltage Deviation Over Temperature Range (1) - figure 1 VKA = Vref, Ik = 10 mA, Tmin ≤Tamb ≤ Tmax 7 30 7 30 2.490 2.500 2.510 2.493 2.500 2.507 TL1431AI Unit Vref ∆Vref mV ∆ Vref --------------∆T 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 - figure 2 Ik = 10mA - ∆VKA = 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 1 VKA = Vref Off-State Cathode Current - figure 3 Dynamic Impedance (3) ppm/°C ±22 ±100 ±22 ±100 ∆ Vref --------------∆ Vka Iref mV/V -1.1 2 -1.1 2 µA 1.5 2.5 3 1.5 2.5 3 ∆Iref µA 0.5 1 0.8 1.2 mA nA Ω Imin Ioff ⏐ZKA⏐ 0.5 180 1 500 0.5 180 0.7 500 VKA = Vref , ∆ Ik = 1 to100mA, f ≤1kHZ 0.2 0.5 0.2 0.5 1. ∆Vref is defined as the difference between the maximum and minimum values obtained over the full temperature range. ∆Vref = Vref max. - Vref min. V ref max. V ref min. T1 T2 Temperature 2. The temperature coefficient is defined as the slopes (positive and negative) of the voltage vs temperature limits within which the reference is guaranteed. -n ppm Max 2.5V min /°C +n p pm/° C Temperature 25°C 3. The dynamic Impedance is definied as|ZKA| = ∆ VKA ---------------∆ IK 5/13 Electrical Characteristics Figure 3. Test circuit for VKA = VREF Figure 4. Input TL1431 Test circuit for V KA = VREF R IK R1 IREF VKA Output Input R IK=10mA Output VKA VREF R2 VREF R1 VKA = VREF ( 1 + ------- ) + R1 x IREF R2 Figure 5. Test circuit for IOFF Figure 6. Test circuit for phase margin and voltage gain VKA=36V IOFF 10µF IK=10mA 10µF 15kΩ 8.25kΩ Output Input VREF Figure 7. Block diagram of TL1431 Figure 8. Test circuit for response time Cathode Vref + Vref Anode 1 mA 0 mA IK=1mA 6/13 Output TL1431 Figure 9. 2.500 2.498 2.496 2.494 2.492 2.490 2.488 2.486 -40 Electrical Characteristics Reference voltage vs. temp. Figure 10. Reference voltage vs. cathode current 3 Reference voltage (V) Reference voltage (V) 2 1 VKA=VREF See figure 1 IK=10 mA VKA=VREF=2.5 V See figure 1 0 -1 -20 0 20 40 60 80 100 120 -40 -20 0 20 40 60 80 100 Temperature (°C) Cathode current (mA) Figure 11. Reference voltage vs. cathode current Figure 12. Reference current vs. temp. 3.0 2.5 1.5 2.0 1.5 1.0 0.5 0.5 0.0 0.0 0.0 -40 IREF ( µA) 2.0 Reference voltage (V) VKA=VREF See figure 1 1.0 IK=10 mA VKA=VREF See figure 1 0.2 0.4 0.6 0.8 1.0 -20 0 20 40 60 80 100 120 Cathode current (mA) Temperature (°C) Figure 13. Off-state cathode current vs. temp. Figure 14. Ratio of change in VREF to change in VKA vs. temp. 0.0 0.10 ∆VREF / ∆VKA (mV / V) 0.08 VKA = 36V See figure 3 -0.5 IK=10 mA VKA=VREF See figure 2 IOFF (µA) 0.06 -1.0 0.04 0.02 -1.5 0.00 -40 -20 0 20 40 60 80 100 120 -2.0 -40 -20 0 20 40 60 80 100 120 Temperature(°C) Temperature (°C) 7/13 Electrical Characteristics Figure 15. Drfit of RKA vs. temp. 0.00 TL1431 Figure 16. Maximum operating current vs. temp. 0.52 0.50 0.48 IMIN ( mA) 0.46 0.44 -0.01 ∆ RKA ( Ω) IK=10 mA VKA=VREF= 2.5V see figure 1 -0.02 IK=IMIN VKA=VREF See figure 1 -0.03 0.42 -0.04 -40 -20 0 20 40 60 80 100 120 0.40 -40 -20 0 20 40 60 80 100 120 Temperature (°C) Temperature (°C) Figure 17. Gain & phase vs. frequency Figure 18. Stability behaviour with capacitive loads 200 60 Gain 40 IK=10 mA See figure 4 100 Cathode current (mA) 150 100 VKA=VREF 80 Stable Area Gain (dB) 20 Phase 50 Phase (°) VKA=5V 60 Stable Area Instable Area 0 0 -50 -100 -20 -150 -40 1 10 100 Frequency (kHz) 1000 -200 10000 VKA=12V VKA=24V 40 20 0 1E-10 1E-9 1E-8 1E-7 1E-6 1E-5 Capacitive Load (F) Figure 19. Maximum power dissipation Figure 20. Pulse response for I K = 1mA 6 100 TAMB= +25°C Cathode current (mA) Current step: 1 mA 80 SO8 Batwing 60 TO92 40 Safe Area Voltage (V) 4 TAMB=+25°C See figure 6 Output voltage 2 20 0 10 20 Cathode voltage (V) 30 0 0 1 2 Time (µs) 3 4 5 8/13 TL1431 Package Mechanical Data 4 Package Mechanical Data 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. 4.1 SO-8 Batwing Package SO-8 MECHANICAL DATA DIM. A A1 A2 B C D E e H h L k ddd 0.1 5.80 0.25 0.40 mm. MIN. 1.35 0.10 1.10 0.33 0.19 4.80 3.80 1.27 6.20 0.50 1.27 8˚ (max.) 0.04 0.228 0.010 0.016 TYP MAX. 1.75 0.25 1.65 0.51 0.25 5.00 4.00 MIN. 0.053 0.04 0.043 0.013 0.007 0.189 0.150 0.050 0.244 0.020 0.050 inch TYP. MAX. 0.069 0.010 0.065 0.020 0.010 0.197 0.157 0016023/C 9/13 Package Mechanical Data TL1431 4.2 TO92 (Tape & Reel) Package TO-92 MECHANICA DATA mm. DIM. MIN. A b D E e e1 L R S1 W 4.32 0.36 4.45 3.30 2.41 1.14 12.7 2.16 0.92 0.41 TYP MAX. 4.95 0.51 4.95 3.94 2.67 1.40 15.49 2.41 1.52 0.56 MIN. 170.1 14.2 175.2 129.9 94.9 44.9 500.0 85.0 36.2 16.1 TYP. MAX. 194.9 20.1 194.9 155.1 105.1 55.1 609.8 94.9 59.8 22.0 mils 0102782/C 10/13 TL1431 Package Mechanical Data 4.3 TO92 (Tape Ammo Pack) Package A1 P P T H d A H1 H0 H I1 W0 D0 F1 F2 P2 P0 W2 W1 W L1 Millimeters Dim. Min Typ. Max. Min. Inches Typ. Max. AL A T d I1 P PO P2 F1/F2 ∆h ∆P 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 11/13 Package Mechanical Data TL1431 4.4 TO92 (Bulk) Package Millimeters Dim. 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 12/13 TL1431 Revision History 5 Revision History Date Revision Changes March 2002 Nov. 2005 1 2 Initial release. PPAP references inserted in the datasheet see Table : Order Codes on page 1 . 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