TS821 1.225V micropower shunt voltage reference Features ■ 1.225V typical output voltage ■ Ultra low operating current: 45μA maximum at 25°C ■ High precision @ 25°C – +/- 2% (standard version) – +/- 1% (A grade) – +/- 0.5% (B grade) ■ High stability when used with capacitive loads ■ Industrial temperature range: -40°C to +85°C ■ 120ppm/°C maximum temperature coefficient L SOT23-3L (Plastic micropackage) Pin connections (Top view) Applications ■ Computers ■ Instrumentation ■ Battery chargers ■ Switch mode power supply ■ Battery operated equipment Description The TS821 is a low power shunt voltage reference providing a stable 1.225V output voltage over the industrial temperature range (-40°C to +85°C). Availabe in SOT23-3 surface mount package, it can be designed in applications where space saving is critical. The low operating current is a key advantage for power restricted designs. In addition, the TS821 is very stable and can be used in a broad range of application conditions. July 2007 Rev 2 1/9 www.st.com 9 Absolute maximum ratings and operating conditions 1 TS821 Absolute maximum ratings and operating conditions Table 1. Absolute maximum ratings (AMR) Symbol Parameter Value Unit Ik Reverse breakdown current 20 mA If Forward current 10 mA 360 mW -65 to +150 °C 2 kV 200 V 260 °C (1) Pd Power dissipation Tstg Storage temperature Human body model SOT23-3 (HBM)(2) ESD Machine model (MM) Tlead (3) Lead temperature (soldering, 10 seconds) 1. Pd is calculated with Tamb = 25°C and Tj = 150°C and Rthja = 340°C/W for the SOT23-3L package. 2. Human body model: 100pF discharged through a 1.5kΩ resistor between two pins of the device, done for all couples of pin combinations with other pins floating. 3. Machine model: a 200pF cap is charged to the specified voltage, then discharged directly between two pins of the device with no external series resistor (internal resistor < 5Ω), done for all couples of pin combinations with other pins floating. Table 2. Symbol 2/9 Operating conditions Parameter Value Unit Imin Minimum operating current 45 μA Imax Maximum operating current 12 mA Toper Operating free air temperature range -40 to +85 °C TS821 Electrical characteristics 2 Electrical characteristics Table 3. TS821 (2% precision) Tamb = 25°C (1) (unless otherwise specified) Symbol Parameter Test conditions Reverse breakdown voltage Ik = 100μA Vk Reverse breakdown voltage tolerance Ik = 100μA -40°C < Tamb < +85°C Ik-min Minimum operating current ΔVref/ΔT Average temperature coefficient ΔVk/ΔIk Reverse breakdown voltage change with operating current range Min. Typ. Max. 1.200 1.225 1.250 -25 +34 Tamb = 25°C +25 +34 40 45 -40°C < Tamb < +85°C 50 Ik = 100μA 120 Ik-min < Ik < 1mA -40°C < Tamb < +85°C 0.3 0.7 1 1mA < Ik < 12mA -40°C < Tamb < +85°C 2.5 8 10 0.5 Unit V mV μA ppm/°C mV Rka Static impedance ΔIk = 45µA to 1mA 0.25 Ω Kvh Long term stability Ik = 100μA, t = 1000hrs 120 ppm En Wide band noise Ik = 100μA, 10Hz < f < 10kHz 200 nV/√Hz 1. Limits are 100% production tested at 25°C. Behavior at the temperature range limits is guaranteed through correlation and by design. Table 4. Symbol TS821A (1% precision) Tamb = 25°C(1)(unless otherwise specified) Parameter Test conditions Reverse breakdown voltage Ik = 100μA Vk Reverse breakdown voltage tolerance Ik = 100μA -40°C < Tamb < +85°C Ik-min Minimum operating current ΔVref/ΔT ΔVk/ΔIk Average temperature coefficient Reverse breakdown voltage change with operating current range Tamb = 25°C Min. Typ. Max. 1.213 1.225 1.237 -12 -22 +12 +22 40 45 -40°C < Tamb < +85°C 50 Ik = 100μA 120 Ik-min < Ik < 1mA -40°C < Tamb < +85°C 0.3 0.7 1 1mA < Ik < 12mA -40°C < Tamb < +85°C 2.5 5 7 0.5 Unit V mV μA ppm/°C mV Rka Static impedance ΔIk = 45μA to 1mA 0.25 Ω Kvh Long term stability Ik = 100μA, t = 1000hrs 120 ppm En Wide band noise Ik = 100μA 10Hz < f < 10kHz 200 nV/√Hz 1. Limits are 100% production tested at 25°C. Behavior at the temperature range limits is guaranteed through correlation and by design. 3/9 Electrical characteristics Table 5. Symbol TS821 TS821B (0.5% precision) Tamb = 25°C(1) (unless otherwise specified) Parameter Test conditions Reverse breakdown voltage Ik = 100μA Vk Reverse breakdown voltage tolerance Ik = 100μA -40°C < Tamb < +85°C Ik-min Minimum operating current ΔVref/ΔT ΔVk/ΔIk Average temperature coefficient Reverse breakdown voltage change with operating current range Tamb = 25°C Min. Typ. Max. 1.219 1.225 1.231 -6 -16 +6 +16 40 45 -40°C < Tamb < +85°C 50 Ik = 100μA 120 Ik-min < Ik < 1mA -40°C < Tamb < +85°C 0.3 0.7 1 1mA < Ik < 12mA -40°C < Tamb < +85°C 2.5 5 7 0.5 Unit V mV μA ppm/°C mV Rka Static impedance ΔIk = 45μA to 1mA 0.25 Kvh Long term stability Ik = 100μA, t = 1000hrs 120 ppm En Wide band noise Ik = 100μA 10Hz < f < 10kHz 200 nV/√Hz W 1. Limits are 100% production tested at 25°C. Behavior at the temperature range limits is guaranteed through correlation and by design. 4/9 TS821 Electrical characteristics Figure 1. Reference voltage versus cathode current Figure 2. 100 8 Cathode current (µA) Cathode current (mA) 12 Reference voltage versus cathode current 4 0 -4 50 0 -8 -50 -1 0 -0.5 0.5 1 -1 1.5 -0.5 0 1 0.5 Reference voltage (V) Reference voltage (V) Figure 3. Test circuit Figure 4. 1.5 Reference voltage versus temperature 1.26 +2% 1.25 Ik=(Vin-Vref)/R Vout=Vref Cathode voltage (V) R +1% +0.5% 1.24 1.23 1.22 1.21 -0.5% -1% 1.2 1.19 -2% -40 -20 0 20 40 60 80 Temperature (°C) Figure 5. Static impedance versus temperature Figure 6. Noise voltage versus frequency 800 0.25 Noise voltage (nV/VHz) Static impedance (Ohms) 700 0.24 0.23 0.22 0.21 CL=10µF 600 500 400 300 CL=100µF 200 CL=0µF 100 0.2 -40 -20 0 20 40 Temperature (°C) 60 80 0 0 1 10 100 1,000 10,000 Frequency (Hz) 5/9 Package information Figure 7. TS821 Pulse response for Ik=100µA Figure 8. Test circuit for pulse response at Ik=100µA 3V 18 KΩ Ik=100µA 1.225V Output 0V 0 Intput Pulse Generator Output Input 0V 2 4 6 8 10 Time (µs) Figure 9. Pulse response for Ik=1mA Figure 10. Test circuit for pulse response at Ik=1mA 3V Input 1.8 KΩ Ik=1mA 1.225V Output 0 2 Output Pulse Generator Intput 0V 0V 4 6 8 10 Time (µs) 3 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. 6/9 TS821 Package information Figure 11. 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° 7110469/A 7/9 Ordering information 4 Ordering information Table 6. 5 Order codes Part number Precision TS821ILT 2% Temperature range Package Packing Marking L213 -40°C to +85°C TS821AILT 1% TS821BILT 0.5% SOT23-3 Tape & reel L212 L211 Revision history Table 7. 8/9 TS821 Document revision history Date Revision Changes 10-Nov-2005 1 Initial release. 24-Jul-2007 2 Removed information related to TO-92. Format update. TS821 Please Read Carefully: Information in this document is provided solely in connection with ST products. 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