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LM45B Datasheet(PDF) 1 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
Part No. LM45B
Description  SOT-23 Precision Centigrade Temperature Sensors
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Maker  NSC [National Semiconductor (TI)]
Homepage  http://www.national.com
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TLH11754
May 1995
LM45BLM45C
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
b
20 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 02 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 100 mV C scale factor
Y
g
3 C accuracy guaranteed
Y
Rated for full b20 to a100 C range
Y
Suitable for remote applications
Y
Low cost due to wafer-level trimming
Y
Operates from 40V to 10V
Y
Less than 120 mA current drain
Y
Low self-heating 020 C in still air
Y
Nonlinearity only g08 C max over temp
Y
Low impedance output 20X for 1 mA load
Connection Diagram
SOT-23
TLH11754 – 1
Top View
See NS Package Number M03B
(JEDEC Registration TO-236AB)
SOT-23
Order
Device
Number
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
Typical Applications
TLH11754 – 3
FIGURE 1 Basic Centigrade Temperature
Sensor (a25 Cto a100 C)
TLH11754 – 4
Choose R1 ebVS 50 mA
VOUTe (10 mV C c Temp C)
VOUT ea1000 mV at a100 C
ea
250 mV at a25 C
eb
200 mV at b20 C
FIGURE 2 Full-Range Centigrade
Temperature Sensor (b20 Cto a100 C)
C1995 National Semiconductor Corporation
RRD-B30M75Printed in U S A




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