Rainbow-electronics LM61 User Manual

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LM61
2.7V, SOT-23 or TO-92 Temperature Sensor
General Description
The LM61 is a precision integrated-circuit temperature sen-
sor that can sense a −30˚C to +100˚C temperature range
while operating from a single +2.7V supply. The LM61’s
output voltage is linearly proportional to Celsius (Centigrade)
temperature (+10 mV/˚C) and has a DC offset of +600 mV.
The offset allows reading negative temperatures without the
need for a negative supply. The nominal output voltage of the
LM61 ranges from +300 mV to +1600 mV for a −30˚C to
+100˚C temperature range. The LM61 is calibrated to pro-
vide accuracies of
±
2.0˚C at room temperature and
±
3˚C
over the full −25˚C to +85˚C temperature range.
The LM61’s linear output, +600 mV offset, and factory cali-
bration simplify external circuitry required in a single supply
environment where reading negative temperatures is re-
quired. Because the LM61’s quiescent current is less than
125 µA, self-heating is limited to a very low 0.2˚C in still air.
Shutdown capability for the LM61 is intrinsic because its
inherent low power consumption allows it to be powered
directly from the output of many logic gates.
Features
n Calibrated linear scale factor of +10 mV/˚C
n Rated for full −30˚ to +100˚C range
n Suitable for remote applications
n UL Recognized Component
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
j
Accuracy at 25˚C
±
2.0 or
±
3.0˚C
(max)
j
Accuracy for −30˚C to +100˚C
±
4.0˚C (max)
j
Accuracy for −25˚C to +85˚C
±
3.0˚C (max)
j
Temperature Slope +10 mV/˚C
j
Power Supply Voltage Range +2.7V to +10V
j
Current Drain
@
25˚C 125 µA (max)
j
Nonlinearity
±
0.8˚C (max)
j
Output Impedance 800 (max)
Typical Application
01289702
V
O
= (+10 mV/˚C x T ˚C) + 600 mV
Temperature (T) Typical V
O
+100˚C +1600 mV
+85˚C +1450 mV
+25˚C +850 mV
0˚C +600 mV
−25˚C +350 mV
−30˚C +300 mV
FIGURE 1. Full-Range Centigrade Temperature Sensor (−30˚C to +100˚C)
Operating from a Single Li-Ion Battery Cell
February 2004
LM61 2.7V, SOT-23 or TO-92 Temperature Sensor
© 2004 National Semiconductor Corporation DS012897 www.national.com
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Summary of Contents

Page 1 - Typical Application

LM612.7V, SOT-23 or TO-92 Temperature SensorGeneral DescriptionThe LM61 is a precision integrated-circuit temperature sen-sor that can sense a −30˚C t

Page 2 - Ordering Information

Physical Dimensions inches (millimeters) unless otherwise noted (Continued)TO-92 Plastic Package (Z)Order Number LM61BIZ or LM61CIZNS Package Number Z

Page 3 - Electrical Characteristics

Connection DiagramsSOT-2301289701Top ViewSee NS Package Number MA03BTO-9201289725See NS Package Number Z03AOrdering InformationOrderNumberDeviceMarkin

Page 4

Absolute Maximum Ratings (Note 1)Supply Voltage +12V to −0.2VOutput Voltage (+VS+ 0.6V) to−0.6VOutput Current 10 mAInput Current at any pin (Note 2) 5

Page 5 - 1.0 Mounting

Electrical Characteristics (Continued)Note 10: Regulation is measured at constant junction temperature, using pulse testing with a low duty cycle. Cha

Page 6 - 2.0 Capacitive Loads

Typical Performance Characteristics The LM61 in the SOT-23 package mounted to a printed circuitboard as shown in Figure 2 was used to generate the fol

Page 7 - 3.0 Applications Circuits

1.0 Mounting (Continued)2.0 Capacitive LoadsThe LM61 handles capacitive loading well. Without any spe-cial precautions, the LM61 can drive any capacit

Page 8 - 01289720

2.0 Capacitive Loads (Continued)3.0 Applications Circuits01289717FIGURE 6. Simplified Schematic01289718FIGURE 7. Centigrade Thermostat01289719FIGURE 8

Page 9

4.0 Recommended Solder Pads for SOT-23 Package01289720LM61www.national.com 8

Page 10 - NS Package Number Z03A

Physical Dimensions inches (millimeters)unless otherwise notedSOT-23 Molded Small Outline Transistor Package (M3)Order Number LM61BIM3, LM61BIM3X, LM6

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