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LM45BIM3-LM45BIM3X-LM45CIM3-LM45CIM3X
SOT-23 Precision Centigrade Temperature Sensor
LM45
SOT-23 Precision Centigrade T emperature Sensors
General Description
The LM45 seriesare precision integrated-circuit temperature
sensors, whose output voltageis linearly proportionalto the
Celsius (Centigrade) temperature. The LM45 does notre-
quire any external calibrationor trimmingto provide accura-
ciesof ±2˚Cat room temperature and ±3˚C overa full−20to
+100˚C temperature range. Low costis assuredby trimming
and calibrationatthe wafer level. The LM45’s low outputim-
pedance, linear output, and precise inherent calibration
make interfacingto readoutor control circuitry especially
easy.It canbe used witha single power supply,or with plus
and minus supplies.Asit draws only 120μA fromits supply, has very low self-heating, less than 0.2˚Cin stillair. The
LM45is ratedto operate overa −20˚to +100˚C temperature
range.
Applications Battery Management FAX Machines Printers Portable Medical Instruments HVAC Power Supply Modules Disk Drives Computers Automotive
Features Calibrated directlyin˚ Celsius (Centigrade) Linear+ 10.0 mV/˚C scale factor ±3˚C accuracy guaranteed Ratedforfull −20˚to +100˚C range Suitablefor remote applications Low cost dueto wafer-level trimming Operates from 4.0Vto 10V Less than 120μA current drain Low self-heating, 0.20˚Cin stillair Nonlinearity only ±0.8˚C max over temp Low impedance output, 20Ωfor1 mA load
Connection Diagram SOT-23
Order Device
Number Marking SuppliedAs
LM45BIM3 T4B 1000 Unitson Tape and Reel
LM45BIM3X T4B 3000 Unitson Tape and Reel
LM45CIM3 T4C 1000 Unitson Tape and Reel
LM45CIM3X T4C 3000 Unitson Tape and Reel
Typical Applications
SOT-23
DS011754-1
Top View
See NS Package Number MA03B
DS011754-3
FIGURE1. Basic Centigrade Temperature
Sensor (+2.5˚Cto +100˚C)
DS011754-4
ChooseR1 =−VS/50μA
VOUT=(10 mV/˚Cx Temp˚C)
VOUT= +1,000mVat +100˚C +250mVat +25˚C −200mVat −20˚C
FIGURE2. Full-Range Centigrade
Temperature Sensor (−20˚Cto +100˚C)
August 1999
LM45
SOT
Precision
Centigrade
emperature
Sensors
