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National Semiconductor Electronic Components Datasheet

LM50 Datasheet

SOT-23 Single-Supply Centigrade Temperature Sensor

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July 1999
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 us-
ing a single positive supply. The LM50’s output voltage is lin-
early proportional to Celsius (Centigrade) temperature
(+10 mV/˚C) and has a DC offset of +500 mV. The offset al-
lows 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 ±3˚C at room temperature
and ±4˚C over the full −40˚C to +125˚C temperature range.
Trimming and calibration of the LM50 at the wafer level as-
sure low cost and high accuracy. The LM50’s linear output,
+500 mV offset, and factory calibration simplify circuitry re-
quired 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.
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 ±2˚C accuracy guaranteed at +25˚C
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
Connection Diagram
SOT-23
DS012030-1
Top View
See NS Package Number MA03B
Typical Application
Order
Number
LM50BIM3
SOT-23
Device Marking
T5B
LM50CIM3
T5C
LM50BIM3X
T5B
LM50CIM3X
T5C
Supplied As
1000 Units on Tape
and Reel
1000 Units on Tape
and Reel
3000 Units on Tape
and Reel
3000 Units on Tape
and Reel
DS012030-3
FIGURE 1. Full-Range Centigrade Temperature Sensor (−40˚C to +125˚C)
© 1999 National Semiconductor Corporation DS012030
www.national.com


National Semiconductor Electronic Components Datasheet

LM50 Datasheet

SOT-23 Single-Supply Centigrade Temperature Sensor

No Preview Available !

Absolute Maximum Ratings (Note 1)
Supply Voltage
Output Voltage
Output Current
Storage Temperature
Lead Temperature:
SOT Package (Note 2):
Vapor Phase (60 seconds)
Infrared (15 seconds)
TJMAX, Maximum
Junction Temperature
+12V to −0.2V
(+VS + 0.6V) to −1.0V
10 mA
−65˚C to +150˚C
215˚C
220˚C
150˚C
ESD Susceptibility (Note 3):
Human Body Model
Machine Model
2000V
250V
Operating Ratings (Note 1)
Specified Temperature Range:
LM50C
LM50B
Operating Temperature Range
θJA (Note 4)
Supply Voltage Range (+VS)
TMIN to TMAX
−40˚C to +125˚C
−25˚C to +100˚C
−40˚C to +150˚C
450˚C/W
+4.5V to +10V
Electrical Characteristics
Unless otherwise noted, these
limits apply for the specified
sTpAec=ifiTcJat=ionTsMaINpptolyTfoMrAVX;Sa=ll
o+t5heVrDlCimaitnsdTIALO=ADTJ=
+0.5 µA,
= +25˚C,
in the circuit of Figure 1.
unless otherwise noted.
Boldface
Parameter
Conditions
LM50B
Typical
Limit
LM50C
Typical
Limit
Units
(Limit)
(Note 5)
(Note 5)
Accuracy
(Note 6)
Nonlinearity (Note 7)
TA = +25˚C
TA = TMAX
TA = TMIN
±2.0
±3.0
+3.0, −3.5
±0.8
±3.0
±4.0
±4.0
±0.8
˚C (max)
˚C (max)
˚C (max)
˚C (max)
Sensor Gain
+9.7
+9.7
mV/˚C (min)
(Average Slope)
+10.3
+10.3
mV/˚C (max)
Output Resistance
2000
4000
2000
4000
(max)
Line Regulation
(Note 8)
+4.5V VS +10V
±0.8
±1.2
±0.8
±1.2
mV/V (max)
mV/V (max)
Quiescent Current
(Note 9)
+4.5V VS +10V
130
180
130 µA (max)
180 µA (max)
Change of Quiescent
Current (Note 9)
+4.5V VS +10V
2.0
2.0 µA (max)
Temperature Coefficient of
+1.0
+2.0
µA/˚C
Quiescent Current
Long Term Stability (Note 10)
TJ = 125˚C, for
1000 hours
±0.08
±0.08
˚C
Note 1: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. DC and AC electrical specifications do not apply when operating
the device beyond its rated operating conditions.
Note 2: See AN-450 “Surface Mounting Methods and Their Effect on Product Reliability” or the section titled “Surface Mount” found in a current National Semicon-
ductor Linear Data Book for other methods of soldering surface mount devices.
Note 3: Human body model, 100 pF discharged through a 1.5 kresistor. Machine model, 200 pF discharged directly into each pin.
Note 4: Thermal resistance of the SOT-23 package is specified without a heat sink, junction to ambient.
Note 5: Limits are guaranteed to National’s AOQL (Average Outgoing Quality Level).
Note 6: Accuracy is defined as the error between the output voltage and 10mv/˚C times the device’s case temperature plus 500 mV, at specified conditions of volt-
age, current, and temperature (expressed in ˚C).
Note 7: Nonlinearity is defined as the deviation of the output-voltage-versus-temperature curve from the best-fit straight line, over the device’s rated temperature
range.
Note 8: Regulation is measured at constant junction temperature, using pulse testing with a low duty cycle. Changes in output due to heating effects can be com-
puted by multiplying the internal dissipation by the thermal resistance.
Note 9: Quiescent current is defined in the circuit of Figure 1 .
Note 10: For best long-term stability, any precision circuit will give best results if the unit is aged at a warm temperature, and/or temperature cycled for at least 46
hours before long-term life test begins. This is especially true when a small (Surface-Mount) part is wave-soldered; allow time for stress relaxation to occur. The ma-
jority of the drift will occur in the first 1000 hours at elevated temperatures. The drift after 1000 hours will not continue at the first 1000 hour rate.
www.national.com
2


Part Number LM50
Description SOT-23 Single-Supply Centigrade Temperature Sensor
Maker National Semiconductor
Total Page 7 Pages
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