LM45 SOT-23 Precision Centigrade Temperature Sensors - Micropik

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LM45Typical Applications01175403FIGURE 1. Basic Centigrade TemperatureSensor (+2.5˚C to +100˚C)Choose R 1 =−V S /50 µAV OUT = (10 mV/˚C x Temp ˚C)V OUT = +1,000 mV at +100˚C= +250 mV at +25˚C= −200 mV at −20˚C01175404FIGURE 2. Full-Range CentigradeTemperature Sensor (−20˚C to +100˚C)www.national.com 2
Absolute Maximum Ratings (Note 1)Operating Ratings (Note 1)LM45Supply VoltageOutput VoltageOutput CurrentStorage TemperatureESD Susceptibility (Note 3):Human Body ModelMachine Model+12V to −0.2V+V S + 0.6V to−1.0V10 mA−65˚C to +150˚C2000V250VSpecified Temperature Range(Note 4)T MIN to T MAXLM45B, LM45C−20˚C to +100˚COperating Temperature RangeLM45B, LM45C−40˚C to +125˚CSupply Voltage Range (+V S ) +4.0V to +10VSoldering process must comply with National Semiconductor’sReflow Temperature Profile specifications. Refer towww.national.com/packaging. (Note 2)Electrical CharacteristicsUnless otherwise noted, these specifications apply for +V S = +5Vdc and I LOAD = +50 µA, in the circuit of Figure 2. These specificationsalso apply from +2.5˚C to T MAX in the circuit of Figure 1 for +V S = +5Vdc. Boldface limits apply for T A =T J =T MINto T MAX ; all other limits T A =T J = +25˚C, unless otherwise noted.Parameter Conditions LM45B LM45C UnitsTypical Limit Typical Limit (Limit)(Note 5) (Note 5)Accuracy T A =+25˚C ±2.0 ±3.0 ˚C (max)(Note 6) T A =T MAX±3.0 ±4.0 ˚C (max)T A =T MIN±3.0 ±4.0 ˚C (max)Nonlinearity T MIN ≤T A ≤T MAX±0.8 ±0.8 ˚C (max)(Note 7)Sensor Gain T MIN ≤T A ≤T MAX +9.7 +9.7 mV/˚C (min)(Average Slope) +10.3 +10.3 mV/˚C (max)Load Regulation (Note 8) 0≤I L ≤ +1 mA ±35 ±35 mV/mA (max)Line Regulation +4.0V≤+V S ≤+10V ±0.80 ±0.80 mV/V (max)(Note 8) ±1.2 ±1.2 mV/V (max)Quiescent Current +4.0V≤+V S ≤+10V, +25˚C 120 120 µA (max)(Note 9) +4.0V≤+V S ≤+10V 160 160 µA (max)Change of Quiescent 4.0V≤+V S ≤10V 2.0 2.0 µA (max)Current (Note 9)Temperature Coefficient +2.0 +2.0 µA/˚Cof Quiescent CurrentMinimum Temperature In circuit of +2.5 +2.5 ˚C (min)for Rated Accuracy Figure 1, I L =0Long Term Stability (Note 10) T J =T MAX , for 1000 hours ±0.12 ±0.12 ˚CNote 1: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. DC and AC electrical specifications do not apply when operatingthe device beyond its rated operating conditions.Note 2: Reflow temperature profiles are different for lead-free and non-lead-free packages.Note 3: Human body model, 100 pF discharged through a 1.5 kΩ resistor. Machine model, 200 pF discharged directly into each pin.Note 4: Thermal resistance of the SOT-23 package is 260˚C/W, junction to ambient when attached to a printed circuit board with 2 oz. foil as shown in Figure 3.Note 5: Limits are guaranteed to National’s AOQL (Average Outgoing Quality Level).Note 6: Accuracy is defined as the error between the output voltage and 10 mv/˚C times the device’s case temperature, at specified conditions of voltage, current,and temperature (expressed in ˚C).Note 7: Nonlinearity is defined as the deviation of the output-voltage-versus-temperature curve from the best-fit straight line, over the device’s rated temperaturerange.Note 8: Regulation is measured at constant junction temperature, using pulse testing with a low duty cycle. Changes in output due to heating effects can becomputed by multiplying the internal dissipation by the thermal resistance.Note 9: Quiescent current is measured using the circuit of Figure 1.Note 10: For best long-term stability, any precision circuit will give best results if the unit is aged at a warm temperature, and/or temperature cycled for at least 46hours before long-term life test begins. This is especially true when a small (Surface-Mount) part is wave-soldered; allow time for stress relaxation to occur.3www.national.com
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LM45 SOT-23 Precision Centigrade Temperature Sensors - Micropik

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