LM62 2.7V, 15.6 mV/˚C, SOT-23 Temperature Sensor
June 1999
LM62
2.7V, 15.6 mV/˚C SOT-23 Temperature Sensor
General Description
The LM62 is a precision integrated-circuit temperature sen-
sor 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) tem-
perature (+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 at room temperature and +2.5˚C/
−2.0˚C over the full 0˚C to +90˚C temperature range.
The LM62’s linear output, +480 mV offset, and factory cali-
bration simplify external circuitry required in a single supply
environment where reading temperatures down to 0˚C is re-
quired. 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 in-
herent low power consumption allows it to be powered di-
rectly from the output of many logic gates.
Applications
n
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n
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Cellular Phones
Computers
Power Supply Modules
Battery Management
FAX Machines
Printers
HVAC
Disk Drives
Appliances
Key Specifications
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Accuracy at 25˚C
n
Temperature Slope
n
Power Supply Voltage Range
n
Current Drain
@
25˚C
n
Nonlinearity
n
Output Impedance
±
2.0 or
±
3.0˚C
(max)
+15.6 mV/˚C
+2.7V to +10V
130 µA (max)
±
0.8˚C (max)
4.7 kΩ (max)
Features
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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
Typical Application
DS100893-1
Top View
See NS Package Number MA03B
DS100893-2
V
O
= (+15.6 mV/˚C x T˚C) + 480 mV
Ordering Information
Order
Number
LM62BIM3
LM62BIM3X
LM62CIM3
LM62CIM3X
SOT-23
Device
Marking
T7B
T7B
T7C
T7C
1000 Units on Tape and Reel
3000 Units on Tape and Reel
1000 Units on Tape and Reel
3000 Units on Tape and Reel
Supplied As
Temperature (T)
+90˚C
+70˚C
+25˚C
0˚C
Typical V
O
+1884 mV
+1572 mV
870 mV
+480 mV
FIGURE 1. Full-Range Centigrade Temperature Sensor
(0˚C to +90˚C) Stabilizing a Crystal Oscillator
© 1999 National Semiconductor Corporation
DS100893
www.national.com
NSC [ NATIONAL SEMICONDUCTOR ]
