TS3431 1.24V programmable shunt voltage reference Features ■ Adjustable output voltage: 1.24 to 24V ■ Several precision levels @ 25°C ±2%, ±1%, ±0.5% and ±0.25% ■ Sink current capability: 0.4 to 100mA ■ Industrial temperature range: -40°C to +125°C ■ Performance compatible with industry standard TL431 L SOT23-3L (Plastic micropackage) Applications Computers ■ Instrumentation ■ Battery chargers ■ Switch mode power supply ■ Battery operated equipment SOT23-3 (top view) Reference 1 TS3431 ■ Description The TS3431 is a programmable shunt voltage reference with guaranteed temperature stability over the entire operating temperature range (-40°C to +125°C). The output voltage can be set to any value between 1.24V and 24V with an external resistor bridge. Cathode 3 Anode 2 Available in SOT23-3 surface mount package, it can be used in application designs where space saving is critical. June 2007 Rev 3 1/10 www.st.com 10 Block diagram 1 TS3431 Block diagram Figure 1. Block diagram Cathode Reference + - VREF Anode 2 Absolute maximum ratings Table 1. Absolute maximum ratings (AMR) Symbol VKA IK IREF Parameter Value Unit 25 V -100 to +150 mA -0.05 to10 mA 360 mW -65 to +150 °C 2 kV Machine model (MM) 200 V Lead temperature (soldering, 10 seconds) 250 °C Value Unit Cathode to anode voltage Reverse breakdown current Reference current Pd Power dissipation (1)SOT23-3L Tstg Storage temperature Human body model (HBM) ESD Tlead 1. Pd is calculated with Tamb = 25°C, Tj = 150°C, Rthjc = 110°C/W, Rthja = 340°C/W. Table 2. Symbol Parameter IK Cathode operating current 0.5 to 100 mA VK Cathode operating voltage 1.24 to 24 V -40 to +125 °C Toper 2/10 Operating conditions Operating free air temperature range TS3431 Electrical characteristics 3 Electrical characteristics Table 3. Tamb = 25°C (unless otherwise specified)(1) Symbol VK ΔVK TC Parameter Reference input voltage IK = 10mA Variation of reference input voltage over temperature Temperature coefficient Test conditions TS3431 (2%) 1.215 TS3431A (1%) 1.228 ΔVref ---------------ΔVka IREF ΔIREF IOFF Typ. Max. 1.252 V TS3431B (0.5%) 1.234 1.246 TS3431C (0.25%) 1.237 1.243 0°C < T < +70°C 10 -40°C < T < +105°C 18 -40°C < T < +125°C 21 -40°C < T < +125°C 100 0.35 mV ppm/°C 0.4 Minimum operating current mA -40°C < T < +125°C IK=10mA Ratio of change in reference input voltage to change in cathode to anode VK= 24 to 1.24V voltage -40°C < T < +125°C 0.5 1.2 1.5 mV/V 2 Reference input current IK=10mA, R1=10KΩ, R2=+ ∞ T= 25°C Reference input current deviation IK=10mA, R1=10KΩ, R2=+ 0°C < T < +70°C 0.5 1 -40°C < T < +125°C 0.9 1.5 T= 25°C 35 500 Off-state cathode current VK=24V Unit 1.265 1.24 T = 25°C IKmin Min. 0.9 1.5 µA -40°C < T < +125°C 2 µA -40°C < T < +105°C 1000 -40°C < T < +125°C 2000 RKA Reverse static impedance IK = 1 to 100mA 0.2 EN Wideband noise IK = 10mA 1kHz < f < 100kHz 100 0.4 nA W nV/√ Hz 1. Limits are 100% production tested at 25°C. Behavior at the temperature range limits is guaranteed through correlation and by design. 3/10 Electrical characteristics Figure 2. TS3431 Reference voltage vs. temperature Figure 3. Test circuit for VK = Vref Voltage Reference (V) 1.250 Input Output 1.245 Ik IK = 10mA VK = VREF 1.240 Vka 1.235 Vref 1.230 -40 0 40 80 120 Temperature (°C) Figure 4. Cathode voltage vs cathode current Figure 5. IKMIN (mA) T=-40°C Minimum operating current Cathode voltage VK (V) 1.5 1.0 0.5 0.0 0.0 T=+25°C 0.1 T=+125°C 0.2 0.3 0.5 0.4 0.3 VK = VREF 0.2 0.1 0.0 -40 0.4 Minimum operating current vs temperature 0 40 Cathode current IK (mA) Figure 6. Reference input current vs temperature Figure 7. 120 Dynamic impedance vs frequency 0.5 Dynamic impedance ZKA (Ω ) Reference current IREF (µA) 1.00 0.75 0.50 0.25 VK = VREF T=+25°C 0.4 0.3 0.2 0.1 0.00 -40 0 40 Temperature (°C) 4/10 80 Temperature (°C) 80 120 0.0 10 100 1000 Frequency (Hz) 10000 TS3431 Electrical characteristics Figure 8. Off-state current vs temperature Figure 9. Test circuit for off-state current measurement OFF State Current IOFF (nA) 300 Vka=24V 200 Ioff 100 0 -40 0 40 80 120 Temperature (°C) Figure 10. Ratio of change in reference input Figure 11. Test circuit for VK > VREF voltage to change in VKA voltage vs temperature 2.0 Input Vka Δ VREF / Δ VK (mV/V) Ik 1.5 R1 Iref 1.0 Δ VK = 1.24 to 24V IK = 10 mA 0.5 0.0 -40 0 40 80 R2 Vref 120 Vka = Vref . (1+R1/R2) + Iref . R1 Temperature (°C) Figure 12. Pulse response at IK=1mA Figure 13. Test circuit for pulse response at IK = 1mA 5.0 T=+25°C Input Voltage ... 2.7K Ω Output voltage 0 Output 4V 2.5 Intput Voltage (V) IK=1mA ... 0.0 0 2 4 6 8 Time (µs) 5/10 Electrical characteristics TS3431 Figure 14. Pulse response at IK = 10mA Figure 15. Test circuit for pulse response at IK = 10mA 5.0 Input Voltage T=+25°C ... 270 Ω Output voltage Output 4V 2.5 Intput Voltage (V) IK=10mA 0 ... 0.0 0 2 4 6 8 Time (µs) Figure 16. Phase and gain vs frequency Figure 17. Equivalent input noise vs frequency Phase (°) 80 300 VK = VREF IK = 10 mA T = +25°C Noise (nV / √ Hz) 40 0 40 Gain (dB) T = +25°C 200 100 20 0 1000 10000 100000 1000000 Figure 18. Test circuit for phase and gain measurement 4.3 K Ω Intput Output IK=10mA 6.8 K Ω 10 µF 6/10 1 10 100 Frequency (kHz) Frequency (Hz) 10 µF 0 0.1 1000 10000 TS3431 4 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. 7/10 Package information TS3431 Figure 19. SOT23-3L package mechanical data Dimensions Ref. Millimeters Min. Typ. Mils Max. Min. Typ. A 0.890 1.120 35.05 44.12 A1 0.010 0.100 0.39 3.94 A2 0.880 1.020 34.65 b 0.300 0.500 11.81 19.69 C 0.080 0.200 3.15 7.88 D 2.800 3.040 110.26 E 2.100 2.64 82.70 E1 1.200 1.400 47.26 0.950 2.900 1.300 37.41 114.17 51.19 0.950 37.41 e1 1.900 74.82 0.400 L1 k 0.600 15.75 0.540 0° 40.17 119.72 103.96 e L 55.13 23.63 21.27 8° 0° 8° 7110469/A 8/10 Max. TS3431 5 Ordering information Ordering information s Table 4. Order codes Part number TS3431ILT TS3431AILT TS3431BILT TS3431CILT 6 Temperature range -40°C, +125°C Package SOT23-3L Packaging Marking Tape & reel L280 L281 L282 L283 Revision history Date Revision Changes 1-Jan-2004 1 Initial release. 1-Dec-2004 2 Specific content changes as follows: – CI version added in Table 4: Order codes. – Rthjc information added in Table 1: Absolute maximum ratings (AMR). – Test condition added in electrical characteristics Table 3. 26-Jun-2007 3 Removed TO-92 package information and associated order codes. Re-ordered electrical characteristics figures. 9/10 TS3431 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. Purchasers are solely responsible for the choice, selection and use of the ST products and services described herein, and ST assumes no liability whatsoever relating to the choice, selection or use of the ST products and services described herein. No license, express or implied, by estoppel or otherwise, to any intellectual property rights is granted under this document. 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