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LM19 Datasheet(PDF) 1 Page - National Semiconductor (TI) |
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LM19 Datasheet(HTML) 1 Page - National Semiconductor (TI) |
1 / 10 page LM19 January 26, 2010 2.4V, 10 μA, TO-92 Temperature Sensor General Description The LM19 is a precision analog output CMOS integrated-cir- cuit temperature sensor that operates over a −55°C to +130° C temperature range. The power supply operating range is +2.4 V to +5.5 V. The transfer function of LM19 is predomi- nately linear, yet has a slight predictable parabolic curvature. The accuracy of the LM19 when specified to a parabolic transfer function is ±2.5°C at an ambient temperature of +30° C. The temperature error increases linearly and reaches a maximum of ±3.8°C at the temperature range extremes. The temperature range is affected by the power supply voltage. At a power supply voltage of 2.7 V to 5.5 V the temperature range extremes are +130°C and −55°C. Decreasing the pow- er supply voltage to 2.4 V changes the negative extreme to −30°C, while the positive remains at +130°C. The LM19's quiescent current is less than 10 μA. Therefore, self-heating is less than 0.02°C in still air. Shutdown capability for the LM19 is intrinsic because its inherent low power con- sumption allows it to be powered directly from the output of many logic gates or does not necessitate shutdown at all. Applications ■ Cellular Phones ■ Computers ■ Power Supply Modules ■ Battery Management ■ FAX Machines ■ Printers ■ HVAC ■ Disk Drives ■ Appliances Features ■ Rated for full −55°C to +130°C range ■ Available in a TO-92 package ■ Predictable curvature error ■ Suitable for remote applications ■ UL Recognized Component Key Specifications ■ Accuracy at +30°C ±2.5 °C (max) ■ Accuracy at +130°C & −55°C ±3.5 to ±3.8 °C (max) ■ Power Supply Voltage Range +2.4V to +5.5V ■ Current Drain 10 μA (max) ■ Nonlinearity ±0.4 % (typ) ■ Output Impedance 160 Ω (max) ■ Load Regulation 0 μA < I L< +16 μA −2.5 mV (max) Typical Application 20004002 V O = (−3.88×10 −6×T2) + (−1.15×10−2×T) + 1.8639 or where: T is temperature, and V O is the measured output voltage of the LM19. Output Voltage vs Temperature 20004024 FIGURE 1. Full-Range Celsius (Centigrade) Temperature Sensor (−55°C to +130°C) Operating from a Single Li-Ion Battery Cell © 2010 National Semiconductor Corporation 200040 www.national.com |
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