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LM19CIZ
2.4V, 10µA, TO-92 Temperature Sensor
LM19
2.4V, 10µA, TO-92 Temperature Sensor
General DescriptionThe LM19isa precision analog output CMOS integrated-
circuit temperature sensor that operates overa −55˚Cto
+130˚C temperature range. The power supply operating
rangeis +2.4Vto +5.5V. The transfer functionof LM19is
predominately linear, yet hasa slight predictable parabolic
curvature. The accuracyof the LM19 when specifiedtoa
parabolic transfer functionis ±2.5˚Catan ambient tempera-
tureof +30˚C. The temperature error increases linearly and
reachesa maximumof ±3.8˚Cat the temperature range
extremes. The temperature rangeis affectedby the power
supply voltage.Ata power supply voltageof2.7Vto5.5V
the temperature range extremes are +130˚C and −55˚C.
Decreasing the power supply voltageto 2.4V changes the
negative extremeto −30˚C, while the positive remainsat
+130˚C.
The LM19’s quiescent currentis less than10 µA. Therefore,
self-heatingis less than 0.02˚Cin stillair. Shutdown capa-
bilityforthe LM19is intrinsic becauseits inherent low power
consumption allowsittobe powered directly fromthe output many logic gatesor doesnot necessitate shutdownatall.
Applications Cellular Phones Computers Power Supply Modules Battery Management FAX Machines Printers HVAC Disk Drives Appliances
Features Ratedforfull −55˚Cto +130˚C range Availableina TO-92 package Predictable curvature error Suitablefor remote applications
Key Specifications Accuracyat +30˚C ±2.5˚C (max) Accuracyat +130˚C& −55˚C ±3.5to ±3.8˚C (max) Power Supply Voltage Range +2.4Vto +5.5V Current Drain 10µA (max) Nonlinearity ±0.4% (typ) Output Impedance 160Ω (max) Load Regulation
0µA
Typical Application
Output Voltagevs Temperature
20004002= (−3.88x10−6xT2)+ (−1.15x10−2xT)+ 1.8639
where:is temperature,andVOisthe measured output voltageofthe LM19.
FIGURE1. Full-Range Celsius (Centigrade) Temperature Sensor (−55˚Cto +130˚C)
Operating froma Single Li-Ion Battery Cell
January 2003
LM19
2.4V
10µA,
O-92
emperature
Sensor
