LM45BIM3 National Semiconductor, LM45BIM3 Datasheet

Temperature Sensor IC

LM45BIM3

Manufacturer Part Number
LM45BIM3
Description
Temperature Sensor IC
Manufacturer
National Semiconductor
Datasheet

Specifications of LM45BIM3

Peak Reflow Compatible (260 C)
No
Ic Function
Temperature Sensor IC
Supply Voltage Max
10V
Leaded Process Compatible
No
Mounting Type
Surface Mount
Supply Voltage Min
4.5V
Operating Temperature Min
-20°C
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant

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© 2005 National Semiconductor Corporation
LM45
SOT-23 Precision Centigrade Temperature Sensors
General Description
The LM45 series are precision integrated-circuit temperature
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-
cies of
+100˚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 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.
Connection Diagram
±
2˚C at room temperature and
LM45BIM3
LM45BIM3X
LM45CIM3
LM45CIM3X
Number
Order
±
3˚C over a full −20 to
DS011754
See NS Package Number mf03a
Top Mark
Device
T4B
T4B
T4C
T4C
Top View
SOT-23
1000 Units on Tape and Reel
3000 Units on Tape and Reel
1000 Units on Tape and Reel
3000 Units on Tape and Reel
Applications
n Battery Management
n FAX Machines
n Printers
n Portable Medical Instruments
n HVAC
n Power Supply Modules
n Disk Drives
n Computers
n Automotive
Features
n Calibrated directly in ˚ Celsius (Centigrade)
n Linear + 10.0 mV/˚C scale factor
n
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
n Nonlinearity only
n Low impedance output, 20Ω for 1 mA load
±
3˚C accuracy guaranteed
01175401
Supplied As
±
0.8˚C max over temp
www.national.com
August 2005

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LM45BIM3 Summary of contents

Page 1

... 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. Connection Diagram Order Number LM45BIM3 LM45BIM3X LM45CIM3 LM45CIM3X © 2005 National Semiconductor Corporation Applications n Battery Management n FAX Machines n Printers n Portable Medical Instruments ± ...

Page 2

Typical Applications Choose R = −V /50 µ (10 mV/˚C x Temp ˚C) OUT V = +1,000 mV at +100˚C OUT = +250 mV at +25˚C = −200 mV at −20˚C www.national.com 01175403 FIGURE 1. Basic ...

Page 3

Absolute Maximum Ratings Supply Voltage Output Voltage Output Current Storage Temperature ESD Susceptibility (Note 3): Human Body Model Machine Model Electrical Characteristics Unless otherwise noted, these specifications apply for +V fications also apply from +2.5˚ ...

Page 4

Typical Performance Characteristics circuit board as shown in Figure 3. Thermal Resistance Junction to Air Thermal Response in Still Air with Heat Sink (Figure 3) Start-Up Voltage vs Temperature www.national.com To generate these curves the LM45 was mounted to a ...

Page 5

Typical Performance Characteristics circuit board as shown in Figure 3. (Continued) Quiescent Current vs Temperature (In Circuit of Figure 2) Noise Voltage Start-Up Response To generate these curves the LM45 was mounted to a printed Accuracy vs Temperature 01175430 01175432 ...

Page 6

Printed Circuit Board FIGURE 3. Printed Circuit Board Used for Heat Sink to Generate All Curves. 1 ⁄ " Square Printed Circuit Board with 2 oz. Foil or Similar 2 Applications The LM45 can be applied easily in the same ...

Page 7

Typical Applications CAPACITIVE LOADS Like most micropower circuits, the LM45 has a limited ability to drive heavy capacitive loads. The LM45 by itself is able to drive 500 pF without special precautions. If heavier loads are anticipated easy ...

Page 8

Typical Applications FIGURE 11. Temperature To Digital Converter (Serial Output) (+128˚C Full Scale) FIGURE 12. Temperature To Digital Converter (Parallel TRI-STATE Standard Data Bus to µP Interface) (128˚C Full Scale) www.national.com (Continued) FIGURE 10. Expanded Scale Thermometer (50˚ to 80˚ ...

Page 9

Typical Applications (Continued film resistor -Trim R for V =3.075V B B -Trim R for V =1.955V C C -Trim R for V =0.075V + 100mV/˚ ambient -Example, V =2.275V at 22˚C ...

Page 10

Block Diagram www.national.com 01175422 10 ...

Page 11

... SOT-23 Molded Small Outline Transistor Package (M3) Order Number LM45BIM3, LM45BIM3X, LM45CIM3 or LM45CIM3X National does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and National reserves the right at any time without notice to change said circuitry and specifications. ...

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