NSC LM62CIM3, LM62BIM3 Datasheet
LM62
2.7V, 15.6 mV/˚C SOT-23 Temperature Sensor
LM62 2.7V, 15.6 mV/˚C, SOT-23 Temperature Sensor
June 1999
General Description
The LM62 is a precision integrated-circuit temperature sensor that can sense a 0˚C to +90˚C temperature range while
operating from a single +3.0V supply. The LM62’s output
voltage is linearly proportional to Celsius (Centigrade) temperature (+15.6 mV/˚C) and has a DC offset of +480 mV.
The offset allows reading temperatures down to 0˚C without
the need for a negative supply.The nominal output voltage of
the LM62 ranges from +480 mV to +1884 mV for a 0˚C to
+90˚C temperature range. The LM62 is calibrated to provide
accuracies of
−2.0˚C over the full 0˚C to +90˚C temperature range.
The LM62’s linear output, +480mV offset, and factory cali-
bration simplify external circuitry required in a single supply
environment where reading temperatures down to 0˚C is required. Because the LM62’s quiescent current is less than
130 µA, self-heating is limited to a very low 0.2˚C in still air.
Shutdown capability for the LM62 is intrinsic because its inherent low power consumption allows it to be powered directly from the output of many logic gates.
±
2.0˚C at room temperature and +2.5˚C/
Features
n Calibrated linear scale factor of +15.6 mV/˚C
n Rated for full 0˚C to +90˚C range with 3.0V supply
n Suitable for remote applications
Connection Diagram
SOT-23
Applications
n Cellular Phones
n Computers
n Power Supply Modules
n Battery Management
n FAX Machines
n Printers
n HVAC
n Disk Drives
n Appliances
Key Specifications
n Accuracy at 25˚C
n Temperature Slope +15.6 mV/˚C
n Power Supply Voltage Range +2.7V to +10V
n Current Drain
n Nonlinearity
n Output Impedance 4.7 kΩ (max)
@
25˚C 130 µA (max)
±
2.0 or±3.0˚C
(max)
±
0.8˚C (max)
Typical Application
DS100893-1
See NS Package Number MA03B
Top View
Ordering Information
Order SOT-23
Number Device Supplied As
Marking
LM62BIM3 T7B 1000 Units on Tape and Reel
LM62BIM3X T7B 3000 Units on Tape and Reel
LM62CIM3 T7C 1000 Units on Tape and Reel
LM62CIM3X T7C 3000 Units on Tape and Reel
© 1999 National Semiconductor Corporation DS100893 www.national.com
=
V
(+15.6 mV/˚C x T˚C) + 480 mV
O
Temperature (T) Typical V
+90˚C +1884 mV
+70˚C +1572 mV
+25˚C 870 mV
0˚C +480 mV
FIGURE 1. Full-Range Centigrade Temperature Sensor
(0˚C to +90˚C) Stabilizing a Crystal Oscillator
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O
Absolute Maximum Ratings (Note 1)
Supply Voltage +12V to −0.2V
Output Voltage (+V
Output Current 10 mA
Input Current at any pin (Note 2) 5 mA
Storage Temperature −65˚C to +150˚C
Maximum Junction Temperature (T
) +125˚C
JMAX
ESD Susceptibility (Note 3) :
Human Body Model 2500V
Machine Model 250V
+ 0.6V) to
S
−0.6V
Lead Temperature:
SOT Package (Note 4) :
Vapor Phase (60 seconds) +215˚C
Infrared (15 seconds) +220˚C
Operating Ratings(Note 1)
Specified Temperature Range: T
LM62B, LM62C 0˚C ≤ TA≤ +90˚C
Supply Voltage Range (+V
Thermal Resistance, θ
) +2.7V to +10V
S
(Note 5) 450˚C/W
JA
MIN
≤ TA≤ T
MAX
Electrical Characteristics
Unless otherwise noted, these specifications apply for +V
other limits T
=
=
T
25˚C.
A
J
Parameter Conditions Typical
=
S
. Boldface limits apply for T
+3.0 V
DC
(Note 6)
LM62B LM62C Units
Limits Limits
(Note 7) (Note 7)
Accuracy (Note 8)
±
+2.5/−2.0 +4.0/−3.0 ˚C (max)
Output Voltage at 0˚C +480 mV
Nonlinearity (Note 9)
±
Sensor Gain +16 +16.1 +16.3 mV/˚C (max)
(Average Slope) +15.1 +14.9 mV/˚C (min)
Output Impedance +3.0V ≤ +V
0˚C ≤ T
Line Regulation (Note 10) +3.0V ≤ +V
+2.7V ≤ +V
Quiescent Current +2.7V ≤ +V
≤ +10V 4.7 4.7 kΩ (max)
S
≤ +75˚C, +V
A
≤ +10V
S
≤ +3.3V, 0˚C ≤ TA≤ +75˚C
S
≤ +10V 82 130 130 µA (max)
S
=
+2.7V 4.4 4.4 kΩ (max)
S
±
1.13
±
165 165 µA (max)
Change of Quiescent Current +2.7V ≤ +V
≤ +10V
S
±
5µA
Temperature Coefficient of 0.2 µA/˚C
Quiescent Current
=
Long Term Stability (Note 11) T
Note 1: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for which the device is functional, but do not guarantee specific performance limits. For guaranteed specifications and test conditions, see the Electrical Characteristics. The guaranteed specifications apply only for the test conditions listed. Some performance characteristics may degrade when the device is not operated under the listed test conditions.
Note 2: When the input voltage (V
Note 3: The human body model is a 100 pF capacitor discharged through a 1.5 kΩ resistor into each pin. The machine model is a 200 pF capacitor discharged di-
rectly into each pin.
Note 4: See AN-450 “Surface Mounting Methods and Their Effect on Product Reliability” or the section titled “Surface Mount” found in any post 1986 National Semi-
conductor Linear Data Book for other methods of soldering surface mount devices.
Note 5: The junction to ambient thermal resistance (θ
Note 6: Typicals are at T
Note 7: Limits are guaranteed to National’s AOQL (Average Outgoing Quality Level).
Note 8: Accuracy is defined as the error between the output voltage and +15.6 mV/˚C times the device’s case temperature plus 480 mV, at specified conditions of
voltage, current, and temperature (expressed in ˚C).
Note 9: 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 10: 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 11: 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 majority 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.
) at any pin exceeds power supplies (V
I
=
=
T
25˚C and represent most likely parametric norm.
J
A
=
T
+100˚C,
J
MAX
for 1000 hours
JA
<
I
) is specified without a heat sink in still air.
GND or V
>
+VS), the current at that pin should be limited to 5 mA.
I
±
0.2 ˚C
2.0
0.8
9.7
=
=
T
T
A
J
MIN
±
3.0 ˚C (max)
±
1.0 ˚C (max)
±
1.13 mV/V (max)
±
9.7 mV (max)
to T
MAX
(Limit)
; all
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Typical PerformanceCharacteristics To generate these curves the LM62 was mounted to a printed
circuit board as shown in
Figure 2
.
Thermal Resistance
Junction to Air
Thermal Response
in Stirred Oil Bath
with Heat Sink
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Thermal Time Constant
Thermal Response in Still
Air without a Heat Sink
DS100893-4
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Thermal Response in
Still Air with Heat Sink
DS100893-5
Quiescent Current
vs. Temperature
DS100893-9
Accuracy vs Temperature
DS100893-10
Noise Voltage
DS100893-11
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