lm50b-mdc National Semiconductor Corporation, lm50b-mdc Datasheet

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lm50b-mdc

Manufacturer Part Number
lm50b-mdc
Description
Sot-23 Single-supply Centigrade Temperature Sensor
Manufacturer
National Semiconductor Corporation
Datasheet
© 2006 National Semiconductor Corporation
LM50
SOT-23 Single-Supply Centigrade Temperature Sensor
General Description
The LM50 is a precision integrated-circuit temperature sen-
sor that can sense a −40˚C to +125˚C temperature range
using a single positive supply. The LM50’s output voltage is
linearly proportional to Celsius (Centigrade) temperature
(+10 mV/˚C) and has a DC offset of +500 mV. The offset
allows reading negative temperatures without the need for a
negative supply. The ideal output voltage of the LM50 ranges
from +100 mV to +1.75V for a −40˚C to +125˚C temperature
range. The LM50 does not require any external calibration or
trimming to provide accuracies of
and
Trimming and calibration of the LM50 at the wafer level
assure low cost and high accuracy. The LM50’s linear out-
put, +500 mV offset, and factory calibration simplify circuitry
required in a single supply environment where reading nega-
tive temperatures is required. Because the LM50’s quiescent
current is less than 130 µA, self-heating is limited to a very
low 0.2˚C in still air.
Connection Diagram
±
4˚C over the full −40˚C to +125˚C temperature range.
See NS Package Number mf03A
Top View
SOT-23
±
3˚C at room temperature
01203001
DS012030
Applications
n Computers
n Disk Drives
n Battery Management
n Automotive
n FAX Machines
n Printers
n Portable Medical Instruments
n HVAC
n Power Supply Modules
Features
n Calibrated directly in degree Celsius (Centigrade)
n Linear + 10.0 mV/˚C scale factor
n
n Specified for full −40˚ to +125˚C range
n Suitable for remote applications
n Low cost due to wafer-level trimming
n Operates from 4.5V to 10V
n Less than 130 µA current drain
n Low self-heating, less than 0.2˚C in still air
n Nonlinearity less than 0.8˚C over temp
n UL Recognized Component
LM50BIM3
LM50CIM3
LM50BIM3X
LM50CIM3X
±
Number
2˚C accuracy guaranteed at +25˚C
Order
Top Mark
Device
T5B
T5C
T5B
T5C
1000 Units on Tape
and Reel
1000 Units on Tape
and Reel
3000 Units on Tape
and Reel
3000 Units on Tape
and Reel
Supplied As
February 2006
www.national.com

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lm50b-mdc Summary of contents

Page 1

... Operates from 4.5V to 10V n Less than 130 µA current drain n Low self-heating, less than 0.2˚C in still air n Nonlinearity less than 0.8˚C over temp n UL Recognized Component Order Number LM50BIM3 LM50CIM3 LM50BIM3X LM50CIM3X DS012030 February 2006 Device Supplied As Top Mark T5B 1000 Units on Tape ...

Page 2

Typical Application FIGURE 1. Full-Range Centigrade Temperature Sensor (−40˚C to +125˚C) www.national.com 01203003 2 ...

Page 3

... Soldering process must comply with National Semiconduc- 2000V tor’s Reflow Temperature Profile specifications. Refer to 250V www.national.com/packaging. (Note and LOAD = all other limits MIN MAX A Conditions LM50B Typical (Note 5) = +25˚ MAX = T +3.0, −3.5 MIN +10.3 2000 ≤ +10V S ≤ +10V S ≤ +10V S +1.0 ± ...

Page 4

Typical Performance Characteristics circuit board as shown in Figure 2. Thermal Resistance Junction to Air Thermal Response in Still Air with Heat Sink (Figure 2) Start-Up Voltage vs Temperature www.national.com To generate these curves the LM50 was mounted to a ...

Page 5

Typical Performance Characteristics circuit board as shown in Figure 2. (Continued) Quiescent Current vs Temperature (Figure 1) Noise Voltage Start-Up Response To generate these curves the LM50 was mounted to a printed Accuracy vs Temperature 01203027 01203029 01203031 5 01203028 ...

Page 6

Printed Circuit Board FIGURE 2. Printed Circuit Board Used for Heat Sink to Generate All Curves. ⁄ " Square Printed Circuit Board 1 2 with 2 oz. Foil or Similar 1.0 Mounting The LM50 can be applied easily in the ...

Page 7

Capacitive Loads (Continued) *R2 ≈ 2k with a typical 1300 ppm/˚C drift. 3.0 Typical Applications FIGURE 6. Centigrade Thermostat/Fan Controller FIGURE 7. Temperature To Digital Converter (Serial Output) (+125˚C Full Scale) FIGURE 5. Block Diagram 7 01203017 01203011 01203013 ...

Page 8

Typical Applications FIGURE 8. Temperature To Digital Converter (Parallel TRI-STATE Standard Data Bus to µP Interface) (125˚C Full Scale) FIGURE 9. LM50 With Voltage-To-Frequency Converter And Isolated Output www.national.com (Continued) (−40˚C to +125˚C; 100 Hz to 1750 Hz) 8 ...

Page 9

... Deutsch Tel: +49 (0) 69 9508 6208 English www.national.com Français Tel: +33 ( 8790 Order Number LM50BIM3, or LM50CIM3 NS Package Number mf03a 2. A critical component is any component of a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or system affect its safety or effectiveness ...

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