LM60 2.7V, SOT-23 or TO-92 Temperature Sensor
August 2005
LM60
2.7V, SOT-23 or TO-92 Temperature Sensor
General Description
The LM60 is a precision integrated-circuit temperature sen-
sor that can sense a −40˚C to +125˚C temperature range
while operating from a single +2.7V supply. The LM60’s
output voltage is linearly proportional to Celsius (Centigrade)
temperature (+6.25 mV/˚C) and has a DC offset of +424 mV.
The offset allows reading negative temperatures without the
need for a negative supply. The nominal output voltage of the
LM60 ranges from +174 mV to +1205 mV for a −40˚C to
+125˚C temperature range. The LM60 is calibrated to pro-
vide accuracies of
±
2.0˚C at room temperature and
±
3˚C
over the full −25˚C to +125˚C temperature range.
The LM60’s linear output, +424 mV offset, and factory cali-
bration simplify external circuitry required in a single supply
environment where reading negative temperatures is re-
quired. Because the LM60’s quiescent current is less than
110 µA, self-heating is limited to a very low 0.1˚C in still air in
the SOT-23 package. Shutdown capability for the LM60 is
intrinsic because its inherent low power consumption allows
it to be powered directly from the output of many logic gates.
n
Available in SOT-23 and TO-92 packages
Applications
n
n
n
n
n
n
n
n
n
Cellular Phones
Computers
Power Supply Modules
Battery Management
FAX Machines
Printers
HVAC
Disk Drives
Appliances
Key Specifications
n
n
n
n
n
n
n
n
Features
n
Calibrated linear scale factor of +6.25 mV/˚C
n
Rated for full −40˚ to +125˚C range
n
Suitable for remote applications
±
2.0 and
±
3.0˚C (max)
Accuracy at 25˚C:
±
4.0˚C (max)
Accuracy for −40˚C to +125˚C:
±
3.0˚C (max)
Accuracy for −25˚C to +125˚C:
Temperature Slope: +6.25mV/˚C
Power Supply Voltage Range: +2.7V to +10V
Current Drain
@
25˚C: 110µA (max)
Nonlinearity:
±
0.8˚C (max)
Output Impedance: 800Ω (max)
Typical Application
Connection Diagrams
SOT-23
01268101
01268102
V
O
= (+6.25 mV/˚C x T ˚C) + 424 mV
Top View
See NS Package Number mf03a
TO-92
Temperature (T)
+125˚C
+100˚C
+25˚C
0˚C
−25˚C
−40˚C
Typical V
O
+1205 mV
+1049 mV
+580 mV
+424 mV
+268 mV
+174 mV
01268123
See NS Package Number Z03A
FIGURE 1. Full-Range Centigrade Temperature Sensor
(−40˚C to +125˚C) Operating from a Single Li-Ion
Battery Cell
© 2005 National Semiconductor Corporation
DS012681
www.national.com
NSC [ NATIONAL SEMICONDUCTOR ]
