TS432 1.24 V adjustable shunt voltage reference Features ■ 1.24 V typical output voltage ■ Ultra low operating current: 60 µA maximum at 25° C ■ High precision at 25° C: L SOT23-3L (Plastic micropackage) +/- 1% +/- 0.5% ■ High stability when used with capacitive loads ■ Industrial temperature range: -40° C to +85° C ■ 100 ppm/°C temperature coefficient Pin connections (top view) Applications ■ Computers ■ Instrumentation ■ Battery chargers ■ Switch mode power supply ■ Battery operated equipments SOT23-3 Ref Reference A Anode K Cathode Description The TS432 is an adjustable low power shunt voltage reference providing an output voltage from 1.24 V to 10 V over the industrial temperature range (-40° C to +85° C). Available in SOT23-3 surface mount package, it can be designed in applications where space saving is critical. The low operating current is also a key advantage for power restricted designs. In addition, the TS432 is very stable and can be used in a broad range of application conditions. April 2008 Rev 2 1/11 www.st.com 11 Absolute maximum ratings and operating conditions 1 TS432 Absolute maximum ratings and operating conditions Table 1. Absolute maximum ratings (AMR) Symbol Parameter Value Unit VK Cathode voltage 12 V IK Cathode current -10 to +20 mA Iref Reference input current -0.05 to +3 mA Pd Power dissipation (1) SOT23-3 340 mW Rthja Thermal resistance junction to ambient for SOT23-3 360 °C/W Tlead Lead temperature (soldering 10 seconds) 250 °C Tstg Storage temperature -65 to +150 °C Tj Junction temperature 150 °C HBM: human body model 1.5 kV MM: machine model 150 V Value Unit ESD 1. Pd is calculated with Tamb = 25° C, Tj = 150° C and Rthja = 360° C/W. Table 2. Operating conditions Symbol VK Cathode voltage 1.24 to 10 V IK Cathode current 60µ to 12m A Ambient temperature -40 to +85 °C Tamb 2/11 Parameter TS432 Electrical characteristics 2 Electrical characteristics Table 3. Tamb = 25°C (unless otherwise specified) Symbol Parameter Test conditions Min. IK = 100µA, VK=VREF Vref Reference voltage ΔVref Reference voltage tolerance over temperature IKmin Minimum operating current Iref 1.252 TS432A (0.5%) 1.234 1.246 IK = 100µA, VK=VREF 7 16 Tamb = 25°C 40 60 Reverse breakdown voltage change with -40°C < Tamb < +85°C operating current range 1mA < IK < 12mA Reference input current V 1.228 -40°C < Tamb < +85°C Reference voltage change with output voltage change Unit 1.24 65 0.7 IK = 10mA, VK=10V to VREF 1.5 4 6 1.8 2.5 mV/V 3 50 100 nA -40°C < Tamb < +85°C VREF=0, VK=10V μA mV 2 -40°C < Tamb < +85°C IK=10mA, R1=10KΩ, R2=+ ∞ mV 2 -40°C < Tamb < +85°C ΔVref/ΔVK Max. TS432 (1%) IKmin < IK < 1mA ΔVref Typ. 200 1 100 IOFF Off-state cathode current RKA Static impedance ΔIK = 100µA to 12mA 0.25 KVH Long term stability IK = 100µA, t = 1000hrs 120 ppm EN Wide band noise IK = 100µA 100Hz < F < 10kHz 200 nV/√Hz Note: nA -40°C < Tamb < +85°C 150 0.5 W Limits are 100% production tested at 25° C. Behavior over the temperature range is guaranteed through correlation and by design. 3/11 Electrical characteristics Figure 1. TS432 Reference voltage vs temperature Figure 2. Test circuit for VK = Vref Reference Voltage (V) 1.252 Input 1.248 Output VK = VREF IK = 100µA 1.244 Ik 1.240 VK 1.236 VREF 1.232 1.228 -40 0 40 80 120 Temperature (°C) Figure 3. Cathode voltage vs cathode current Figure 4. Cathode voltage vs cathode current 1.5 VK Cathode voltage (V) IK Cathode current (mA) 10 VK = VREF TAMB = +25°C 5 0 TAMB=-40°C 1.0 TAMB=+25°C TAMB=+85°C 0.5 TAMB=+125°C -5 -10 -1.0 -0.5 0.0 0.5 1.0 0.0 1.5 0 20 VK Cathode voltage (V) Figure 5. Reference input current vs temperature Figure 6. 60 Static impedance vs temperature 0.4 RKA Static impedance (Ohms) 100 IREF Reference current (nA) 40 IK Cathode current (µA) IK = 10 mA R1 = 10 KΩ R2 = + ∞ 80 60 40 VK = VREF IK = 100 µA to 12 mA 0.3 0.2 0.1 20 0 -40 0 40 Temperature (°C) 4/11 80 120 0.0 -40 0 40 Temperature (°C) 80 120 TS432 Electrical characteristics Figure 7. Off-state current vs temperature Figure 8. Test circuit for off-state current measurement IOFF Off-State current (nA) 150 Input VK =10V VREF = 0 V VK = 10 V 100 IOFF 50 0 -40 0 40 80 120 Temperature (°C) Figure 9. Ratio of change in reference input voltage to change in VK voltage vs temperature Figure 10. Test circuit for VKA > VREF Ratio of change in Reference input voltage (mV/V) 3 Input VK IK IK = 10 mA VK = 10V to VREF 2 R1 IREF 1 R2 0 -40 0 40 80 120 VREF VK = VREF . (1+R1/R2) + IREF . R1 Temperature (°C) Figure 11. Phase and gain vs frequency Figure 12. Test circuit for phase and gain measurement 60 180 5V TAMB = +25°C Gain Gain (dB) 120 Phase 20 60 23.5 kΩ Phase (Degree) 40 1 µF 22 µF 33 kΩ Output 0 2 10 3 10 10 4 5 10 0 Input 33 kΩ 6 10 Frequency (Hz) 5/11 Electrical characteristics TS432 Figure 13. Test circuit for pulse response at IK=100 µA 3V Figure 14. Test circuit for pulse response at IK = 1 mA 18KΩ 3V 1.8KΩ IK = 100µA V IK=1mA Intput Figure 16. Pulse response at IK = 1 mA Input and Output signals (Volt) Figure 15. Pulse response at IK = 100 µA Input and Ouput signals (Volt) Pulse Generator f=10KHz Output Intput Pulse Generator f=10KHz Output 0V 3 Input 2 Output 1 3 Input IK = 1 mA TAMB = + 25°C 2 1 IK = 100 µA TAMB = + 25°C 0 0 5 10 Output 0 15 0 5 Time (µs) 3 Input 2 IK = 100 µA TAMB = + 25°C 0 5 Input 2 1 Output 10 Time (µs) 6/11 20 IK = 1 mA TAMB = + 25°C 3 Output 0 15 Figure 18. Pulse response at IK = 1 mA Input and Output signals (Volt) Input and Output signals (Volt) Figure 17. Pulse response at IK = 100 µA 1 10 Time (µs) 15 20 0 -5 0 5 10 Time (µs) 15 20 TS432 Electrical characteristics Figure 19. Equivalent input noise vs frequency Figure 20. Block diagram 300 Noise (nV/√ Hz) TAMB = + 25°C Cathode 200 Vref + - 100 0 2 10 1.24V 3 10 4 10 5 10 6 10 7 10 Anode Frequency (Hz) 7/11 Package information 3 TS432 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. 8/11 TS432 Package information Figure 21. SOT23-3 package mechanical drawing 7110469/A Table 4. SOT23-3 package mechanical data Dimensions Ref. Millimeters Min. Typ. Mils Max. Min. Typ. Max. 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° 119.72 103.96 e L 40.17 55.13 23.63 21.27 8° 0° 8° 9/11 Ordering information 4 TS432 Ordering information Table 5. Order codes Precision Order code 1% TS432ILT 0.5% 5 Package Packing -40° C to +85° C SOT23-3 Tape & reel Marking L235 L236 Revision history Table 6. 10/11 TS432AILT Temperature range Document revision history Date Revision Changes 16-Dec-2002 1 Initial release. 7-Apr-2008 2 Corrected package mechanical data. Updated document format. TS432 Please Read Carefully: Information in this document is provided solely in connection with ST products. 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