LM45B Datasheet, PDF (1/8 Pages) National Semiconductor (TI) – SOT-23 Precision Centigrade Temperature Sensors

May 1995
LM45B LM45C
SOT-23 Precision Centigrade Temperature Sensors
General Description
The LM45 series are precision integrated-circuit tempera-
ture sensors whose output voltage is linearly proportional to
the Celsius (Centigrade) temperature The LM45 does not
require any external calibration or trimming to provide accu-
racies of g2 C at room temperature and g3 C over a full
b20 to a100 C temperature range Low cost is assured by
trimming and calibration at the wafer level The LM45’s low
output impedance linear output and precise inherent cali-
bration make interfacing to readout or control circuitry espe-
cially easy It can be used with a single power supply or with
plus and minus supplies As it draws only 120 mA 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 b20 to a100 C
temperature range
Applications
Y _{Battery Management}
Y _{FAX Machines}
Y _Printers
Y _{Portable Medical Instruments}
Y _HVAC
Y _{Power Supply Modules}
Y _{Disk Drives}
Y _Computers
Y _Automotive
Features
Y _{Calibrated directly in Celsius (Centigrade)}
Y _Linear a _{10 0 mV C scale factor}
Y g_{3 C accuracy guaranteed}
Y _{Rated for full} b_{20 to} a_{100 C range}
Y _{Suitable for remote applications}
Y _{Low cost due to wafer-level trimming}
Y _{Operates from 4 0V to 10V}
Y _{Less than 120 mA current drain}
Y _{Low self-heating 0 20 C in still air}
Y _{Nonlinearity only} g_{0 8 C max over temp}
Y _{Low impedance output 20X for 1 mA load}
Connection Diagram
SOT-23
Top View
TL H 11754 – 1
See NS Package Number M03B
(JEDEC Registration TO-236AB)
Typical Applications
Order
Number
SOT-23
Device
Marking
Supplied As
LM45BIM3
T4B 250 Units on Tape and Reel
LM45BIM3X T4B 3000 Units on Tape and Reel
LM45CIM3
T4C 250 Units on Tape and Reel
LM45CIM3X T4C 3000 Units on Tape and Reel
TL H 11754 – 3
FIGURE 1 Basic Centigrade Temperature
Sensor (a2 5 C to a100 C)
Choose R₁ e bV_S 50 mA
V_OUTe (10 mV C c Temp C)
TL H 11754 – 4
V_OUT e a1 000 mV at a100 C
e a250 mV at a25 C
e b200 mV at b20 C
FIGURE 2 Full-Range Centigrade
Temperature Sensor (b20 C to a100 C)
C1995 National Semiconductor Corporation TL H 11754
RRD-B30M75 Printed in U S A