TS3431 1.24 V programmable shunt voltage reference Datasheet − production data Features ■ Adjustable output voltage: 1.24 to 24 V ■ Several precision levels @ 25°C ± 2%, ± 1%, ± 0.5% and ± 0.25% ■ Sink current capability: 0.4 to 100 mA ■ 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 Reference 1 TS3431 ■ Cathode 3 Anode 2 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 1.24 V and 24 V with an external resistor bridge. SOT23-3 (top view) Available in SOT23-3 surface mount package, it can be used in application designs where space saving is critical. August 2012 This is information on a product in full production. Doc ID 10174 Rev 4 1/13 www.st.com 13 Contents TS3431 Contents 1 Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 2 Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 3 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 4 Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 5 Ordering information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 6 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 2/13 Doc ID 10174 Rev 4 TS3431 1 Block diagram Block diagram Figure 1. Block diagram Cathode Reference + - VREF Anode Doc ID 10174 Rev 4 3/13 Absolute maximum ratings 2 TS3431 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 4/13 Operating conditions Operating free air temperature range Doc ID 10174 Rev 4 TS3431 Electrical characteristics 3 Electrical characteristics Table 3. Tamb = 25°C (unless otherwise specified) (1) Symbol VK ΔVK TC Parameter Test conditions Reference input voltage IK = 10 mA, Vka = Vref Variation of reference input voltage over temperature, Vka = Vref Temperature coefficient 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. Doc ID 10174 Rev 4 5/13 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. Dynamic impedance ZKA (Ω) Reference current IREF (µA) 120 Dynamic impedance vs frequency 0.5 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 80 120 0.0 10 Temperature (°C) 6/13 80 Temperature (°C) 100 1000 Frequency (Hz) Doc ID 10174 Rev 4 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 Ioff 200 100 0 -40 0 40 80 120 Temperature (°C) Figure 10. Ratio of change in reference input voltage to change in VKA voltage vs. temperature 2.0 Figure 11. Test circuit for VK > VREF Input Vka ΔVREF / ΔVK (mV/V) Ik 1.5 R1 Iref 1.0 ΔVK = 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) Doc ID 10174 Rev 4 7/13 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 0 0.1 Figure 18. Test circuit for phase and gain measurement Output 4.3 K Ω Intput 8/13 IK=10mA 6.8 K Ω 10 µF 10 µF 1 10 100 Frequency (kHz) Frequency (Hz) Doc ID 10174 Rev 4 1000 10000 TS3431 4 Package mechanical data Package mechanical data In order to meet environmental requirements, ST offers these devices in different grades of ECOPACK® packages, depending on their level of environmental compliance. ECOPACK® specifications, grade definitions and product status are available at: www.st.com. ECOPACK® is an ST trademark. Doc ID 10174 Rev 4 9/13 Package mechanical data Table 4. TS3431 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 10/13 Max. Doc ID 10174 Rev 4 TS3431 5 Ordering information Ordering information s Table 5. Order codes Part numbers TS3431ILT TS3431AILT TS3431BILT TS3431CILT Temperature range -40°C, +125°C Doc ID 10174 Rev 4 Package SOT23-3L Packaging Marking Tape & reel L280 L281 L282 L283 11/13 Revision history 6 TS3431 Revision history Table 6. 12/13 Document 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 5: 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. 30-Aug-2012 4 Added: Vka = Vref parameter in Table 3 on page 5. Doc ID 10174 Rev 4 TS3431 Please Read Carefully: Information in this document is provided solely in connection with ST products. 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