July 1999
LM45
SOT-23 Precision Centigrade Temperature Sensors
n Portable Medical Instruments
n HVAC
The LM45 series are precision integrated-circuit temperature
n Power Supply Modules
General Description
sensors, whose output voltage is linearly proportional to the
Celsius (Centigrade) temperature. The LM45 does not re-
quire any external calibration or trimming to provide accura-
n Disk Drives
n Computers
n Automotive
±
±
cies of 2˚C at room temperature and 3˚C over a full −20 to
+100˚C temperature range. Low cost is assured by trimming
and calibration at the wafer level. The LM45’s low output im-
pedance, linear output, and precise inherent calibration
make interfacing to readout or control circuitry especially
easy. It can be used with a single power supply, or with plus
and minus supplies. As it draws only 120 µA from its supply,
it has very low self-heating, less than 0.2˚C in still air. The
LM45 is rated to operate over a −20˚ to +100˚C temperature
range.
Features
n Calibrated directly in ˚ Celsius (Centigrade)
n Linear + 10.0 mV/˚C scale factor
±
n
3˚C accuracy guaranteed
n Rated for full −20˚ to +100˚C range
n Suitable for remote applications
n Low cost due to wafer-level trimming
n Operates from 4.0V to 10V
n Less than 120 µA current drain
n Low self-heating, 0.20˚C in still air
Applications
n Battery Management
n FAX Machines
n Printers
±
n Nonlinearity only 0.8˚C max over temp
n Low impedance output, 20Ω for 1 mA load
Connection Diagram
SOT-23
Order
Device
Marking
T4B
SOT-23
Number
Supplied As
LM45BIM3
LM45BIM3X
LM45CIM3
LM45CIM3X
1000 Units on Tape and Reel
3000 Units on Tape and Reel
1000 Units on Tape and Reel
3000 Units on Tape and Reel
T4B
T4C
T4C
DS011754-1
Top View
See NS Package Number MA03B
Typical Applications
DS011754-3
DS011754-4
FIGURE 1. Basic Centigrade Temperature
Sensor (+2.5˚C to +100˚C)
=
Choose R
−V /50 µA
S
1
=
V
OUT
V
OUT
(10 mV/˚C x Temp ˚C)
+1,000 mV at +100˚C
=
=
=
+250 mV at +25˚C
−200 mV at −20˚C
FIGURE 2. Full-Range Centigrade
Temperature Sensor (−20˚C to +100˚C)
© 1999 National Semiconductor Corporation
DS011754
www.national.com