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-

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

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Accuracy at 25˚C:

n

Accuracy for −40˚C to +125˚C:

n

Accuracy for −25˚C to +125˚C:

n

Temperature Slope:

+6.25mV/˚C

n

Power Supply Voltage Range:

+2.7V to +10V

n

110µA (max)

n

Nonlinearity:

n

Output Impedance:

800

Ω (max)

Typical Application

Connection Diagrams

SOT-23

01268101

Top View

See NS Package Number MA03B

TO-92

01268123

See NS Package Number Z03A

01268102

Temperature (T)

Typical V

O

+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

© 2001 National Semiconductor Corporation

DS012681

www.national.com