TS431 Low voltage adjustable shunt reference Features ■ Low voltage operation: 1.24 to 6V ■ 2%, 1% and 0.5% voltage precision ■ Wide operating range cathode current: 60µA to 30mA ■ Low output impedance: 0.2Ω ■ Typically stable for any capacitive loads ■ ESD protection: – Human body model: 2kV – Machine model: 200V ■ 100ppm/°C temperature coefficient Z TO92 (Plastic package) Description The TS431 is a low-voltage, three-terminal, programmable shunt voltage reference. The output voltage can be set to any value between Vref (1.24V) and 6V with two external resistors. L SOT23-5 (Plastic micropackage) The TS431 is able to operate at a lower voltage (1.24V) and lower cathode current than the widely used TL431 and TL1431 shunt voltage reference. When driving an optocoupler, the TS431 is particularly useful for regulating 3.3V switching power supplies. August 2007 Rev 6 1/12 www.st.com 12 Absolute maximum ratings and operating conditions 1 TS431 Absolute maximum ratings and operating conditions Table 1. Absolute maximum ratings Symbol VKA Parameter Cathode to anode voltage Value Unit 10 V Ik Continuous cathode current range -20 to +40 mA Iref Reference input current range -0.05 to +3 mA Pd Power dissipation(1) TO92 package SOT23-5 package 625 500 mW Tstg Storage temperature range -65 to +150 °C Value Unit Cathode to anode voltage 1.24 to 6 V Cathode current 0.06 to 30 mA -40 to +125 °C 1. Tjunction=150°C, Tamb=25°C with RTHj-a=200°C/W for TO92 package and RTHj-a=250°C/W for SOT23-5L package Table 2. Operating conditions Symbol VKA Ik Toper 2/12 Parameter Operating free air temperature range TS431 Electrical characteristics 2 Electrical characteristics Table 3. Tamb = 25°C (unless otherwise specified) Symbol Parameter Test conditions Vref Output voltage VKA = Vref @ Ik = 100μA TS431 TS431A TS431B ΔVref Output voltage change (1) (2) Ik = 100μA, VKA = Vref 0 < Tamb < +70°C -40 < Tamb < +85°C -40 < Tamb < +105°C -40 < Tamb < +125°C Min. Typ. Max. Unit 1.215 1.228 1.234 1.240 1.265 1.252 1.246 V 9 16 18 21 mV Ratio of change in reference input Ik = 10mA voltage to change in cathode to VKA = 6V to Vref anode voltage 1.8 2.7 mV/V Reference input current Ik = 10mA 70 160 nA ΔIref Reference input current deviation over temperature range Ik=10mA, R1=10kΩ, R2=∝ -40 < Tamb < +85°C -40 < Tamb < +125°C 70 90 160 240 nA Imin Minimum cathode current for regulation VKA = Vref 40 60 μA Ioff Off-state cathode current VKA = 6V, Vref = 0 0.001 0.1 μA Static impedance VKA = Vref, Ik = 0.1 to 15mA 0.2 0.4 Ω ΔVref ---------------ΔVka Iref RKA 1. Limits are 100% production tested at 25°C. Behavior at the temperature range limits is guaranteed through correlation and by design. 2. See definition below. Definition of output voltage change 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 1. Output voltage change over temperature range Vref m ax. Vref m in . T1 T2 T e m p e ra tu re 3/12 Electrical characteristics Figure 2. TS431 Reference voltage vs. temperature Figure 3. Test circuit for VKA = Vref 1.252 Reference voltage (V) Input Vka = Vref Ik = 100 µA 1.248 Output Ik 1.244 1.24 Vka 1.236 Vref 1.232 1.228 -40 -20 0 20 40 60 80 100 120 Temperature (°C) Figure 4. Cathode voltage vs. cathode current Figure 5. 1.5 15 Vka Cathode voltage (V) Vka = Vref T = 25°C 10 Ika Cathode current (mA) Cathode voltage vs. cathode current 5 0 -5 1 0.5 +125°C -40°C -10 -1 -0.5 0 0.5 1 0 1.5 10 20 Figure 6. 30 40 50 60 Ika Cathode current (µA) Vka Cathode voltage (V) Reference input current vs. temperature Figure 7. Static impedance vs. temperature 0.4 100 Ik = 10mA R1 = 10 KΩ R2 = + ∞ 80 Rka Static Impedance (Ohms) Iref Reference current (nA) +85°C 0 -15 60 40 20 0 0.3 Vka = Vref Ik = 100µA to 15mA 0.2 0.1 0 -40 -20 0 20 40 60 Temperature (°C) 4/12 +25°C 80 100 120 -40 -20 0 20 40 60 Temperature (°C) 80 100 120 TS431 Electrical characteristics Figure 8. Off-state current vs. temperature Figure 9. Test circuit for off-state current measurement 200 IOff Off-State current (nA) Input Vka=6V 150 Ioff 100 50 0 -40 -20 0 20 40 60 80 100 120 Temperature (°C) Ratio of change in reference input voltage (mV/V) Figure 10. Ratio of change in reference input voltage to change in VKA voltage vs. temperature 0 Figure 11. Test circuit for VKA > Vref Input Vka Ik -1 R1 Iref Ik = 10mA Vka = 6V to Vref -2 R2 Vref -3 -40 -20 0 20 40 60 80 100 120 Vka = Vref . (1+R1/R2) + Iref . R1 Temperature (°C) Figure 12. Phase and gain vs. frequency 60 Figure 13. Test circuit for phase and gain measurement 150 Phase 50 100 40 50 10µF 30 20 Gain 10 0 1E+3 1E+4 1E+5 0 6.8K Phase (°) Phase margin # 50° Gain (dB) Output Ik=100µA 10µF -50 Input -100 4.3K Vref -150 1E+6 Frequency (Hz) 5/12 Electrical characteristics TS431 Figure 14. Pulse response at Ik=100μA Figure 15. Test circuit for pulse response at Ik=100μA Input voltage 18KΩ 2 Pulse Generator f=100KHz Output voltage Output Ik=100µA Intput input and output voltage (V) 3 50Ω 1 0 0 1 2 3 4 5 6 7 8 9 10 Time (µs) Figure 16. Pulse response at Ik=1mA Figure 17. Test circuit for pulse response at Ik=1mA Input voltage 1.8KΩ 2 Pulse Generator f=100KHz Output voltage 1 0 0 1 2 3 4 5 6 7 Time (µs) Figure 18. Equivalent input noise vs. frequency Equivalent input noise (nv/VHz) 250 200 150 Vka = Vref Ik = 100 µA T=25°C 100 50 0 0.1 1 10 Frequency (KHz) 6/12 100 1000 50Ω Output Ik=1mA Intput input and output voltage (V) 3 TS431 3 Package information Package information In order to meet environmental requirements, STMicroelectronics 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 STMicroelectronics trademark. ECOPACK specifications are available at: www.st.com. 7/12 Package information 3.1 TS431 SOT23-5 package mechanical data Dimensions Ref. Millimeters Min. Typ. Max. Min. Typ. Max. A 0.90 1.45 0.035 0.057 A1 0.00 0.15 0.00 0.006 A2 0.90 1.30 0.035 0.051 b 0.35 0.50 0.014 0.02 C 0.09 0.20 0.003 0.008 D 2.80 3.00 0.110 0.118 H 2.60 3.00 0.102 0.118 E 1.50 1.75 0.059 0.069 e 0.95 0.037 e1 1.9 0.075 L 0.35 0.55 . 8/12 Inches 0.014 0.022 TS431 TO92 (tape ammo pack and tape & reel) package data A1 P T P A H W2 W0 W L1 W1 H0 H I1 d H1 3.2 Package information D0 F1 F2 P2 P0 Millimeters Inches Dim. Min. Typ. Max. 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 0.098 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 Δh -1 0 1 -0.039 0 0.039 ΔP -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 W2 0.5 0.020 H 20 0.787 H0 15.5 16 H1 DO L1 16.5 0.610 0.630 25 3.8 4.0 4.2 11 0.650 0.984 0.150 0.157 0.165 0.433 9/12 Package information 3.3 TS431 TO92 (bulk) package mechanical data Millimeters Inches Dim. Min. L 10/12 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 TS431 Ordering information 4 Ordering information Table 4. Order codes Part number Temperature range Package Packing L272 TS431ILT TS431AILT L271 SOT23-5 TS431BILT L270 Tape & reel TS431IYLT(1) L274 TS431AIYLT(1) TS431BIYLT Marking -40°C, + 125°C SOT23-5 (automotive grade level) L276 (1) L273 TS431IZ/IZT/IZ-AP TS431AIZ/AIZT/AIZ-AP Bulk (Z), Tape & reel (ZT) or Ammo pack (AP) TO92 TS431BIZ/BIZT/BIZ-AP TS431I TS431AI TS431BI 1. Qualification and characterization according to AEC Q100 and Q003 or equivalent, advanced screening according to AEC Q001 & Q 002 or equivalent are on-going. 5 Revision history Table 5. Document revision history Date Revision Changes 1-Sep-2003 1 Initial release. 1-Oct-2005 2 PPAP references inserted in the datasheet. See the order codes table. Minor changes to formatting and grammar. 2-Jan-2006 3 TS431AIYLT PPAP reference inserted. See the order codes table. 22-Sep-2006 4 Included footnote on automotive grade qualification to order codes table. Updated package information (changed mils to inches). 25-Apr-2007 5 Resized graphics on cover page. Moved definition of output voltage change from Table 3 footnote to separate section below table. Corrected errors in SOT23-5 package mechanical data. Removed erroneous drawing for TO92 tape & reel package. 30-Aug-2007 6 Updated drawing for TO92 bulk package. Modified footnote related to automotive grade qualification in Table 4: Order codes, and re-ordered order codes. 11/12 TS431 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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