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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.

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

n Available in SOT-23 and TO-92 packages

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:

2.0 and

3.0˚C (max)

n Accuracy for −40˚C to +125˚C:

4.0˚C (max)

n Accuracy for −25˚C to +125˚C:

3.0˚C (max)

n Temperature Slope: +6.25mV/˚C

n Power Supply Voltage Range: +2.7V to +10V

n Current Drain

25˚C: 110µA (max)

n Nonlinearity:

0.8˚C (max)

n Output Impedance: 800Ω (max)

Typical Application

Connection Diagrams

SOT-23

01268101

Top View

See NS Package Number MA03B

TO-92

01268123

See NS Package Number Z03A

01268102

= (+6.25 mV/˚C x T ˚C) + 424 mV

Temperature (T) Typical V

+125˚C +1205 mV

+100˚C +1049 mV

+25˚C +580 mV

0˚C +424 mV

−25˚C +268 mV

−40˚C +174 mV

FIGURE 1. Full-Range Centigrade Temperature Sensor

(−40˚C to +125˚C) Operating from a Single Li-Ion

Battery Cell

July 2001

LM60 2.7V, SOT-23 or TO-92 Temperature Sensor

Summary of content (9 pages)

PAGE 1
LM60 2.7V, SOT-23 or TO-92 Temperature Sensor General Description n Available in SOT-23 and TO-92 packages The LM60 is a precision integrated-circuit temperature sensor 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.
PAGE 2
LM60 Ordering Information Order Number Device Marking Supplied In LM60BIM3 T6B 1000 Units on Tape and Reel LM60BIM3X T6B 3000 Units on Tape and Reel LM60CIM3 T6C 1000 Units on Tape and Reel T6C 3000 Units on Tape and Reel LM60CIM3X LM60BIZ LM60BIZ Bulk LM60CIZ LM60CIZ Bulk www.national.
PAGE 3
Supply Voltage (Note 1) Storage Temperature −65˚C to +150˚C +12V to −0.2V Output Voltage (+V S Maximum Junction Temperature (TJMAX) + 0.6V) to −0.
PAGE 4
LM60 Electrical Characteristics (Continued) 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 computed 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.
PAGE 5
To generate these curves the LM60 was mounted to a printed circuit board as shown in Figure 2. (Continued) Supply Voltage vs Supply Current Start-Up Response 01268122 01268112 01268114 FIGURE 2. Printed Circuit Board Used for Heat Sink to Generate All Curves. 1⁄2" Square Printed Circuit Board with 2 oz. Copper Foil or Similar. into a threaded hole in a tank. As with any IC, the LM60 and accompanying wiring and circuits must be kept insulated and dry, to avoid leakage and corrosion.
PAGE 6
LM60 1.0 Mounting (Continued) SOT-23* SOT-23** TO-92* TO-92*** no heat sink small heat fin no heat fin small heat fin θ JA Still air T J − TA θ JA T J − TA θ JA T J − TA θ JA T J − TA (˚C/W) (˚C) (˚C/W) (˚C) 450 0.17 260 0.1 180 0.07 140 0.05 180 0.07 90 0.034 70 0.026 Moving air *-Part soldered to 30 gauge wire. **-Heat sink used is 1⁄2" square printed circuit board with 2 oz. foil with part attached as shown in Figure 2 .
PAGE 7
LM60 2.0 Capacitive Loads (Continued) 01268117 FIGURE 6. Simplified Schematic 3.0 Applications Circuits 01268118 FIGURE 7. Centigrade Thermostat 01268119 FIGURE 8. Conserving Power Dissipation with Shutdown 7 www.national.
PAGE 8
LM60 Physical Dimensions inches (millimeters) unless otherwise noted SOT-23 Molded Small Outline Transistor Package (M3) Order Number LM60BIM3 or LM60CIM3 NS Package Number MA03B www.national.
PAGE 9
LM60 2.7V, SOT-23 or TO-92 Temperature Sensor Physical Dimensions inches (millimeters) unless otherwise noted (Continued) TO-92 Molded Plastic Package (Z) Order Number LM60BIZ or LM60CIZ Package Number Z03A LIFE SUPPORT POLICY NATIONAL’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT AND GENERAL COUNSEL OF NATIONAL SEMICONDUCTOR CORPORATION. As used herein: 1.