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

−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.

Features

n 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

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

(max)

n Temperature Slope

+15.6 mV/˚C

n Power Supply Voltage Range

+2.7V to +10V

130 µA (max)

n Nonlinearity

n Output Impedance

4.7 k

Ω (max)

Connection Diagram

Ordering Information

Order

SOT-23

Number

Device

Supplied As

Marking

LM62BIM3

T7B

1000 Units on Tape and Reel

LM62BIM3X

T7B

3000 Units on Tape and Reel

LM62CIM3

T7C

1000 Units on Tape and Reel

LM62CIM3X

T7C

3000 Units on Tape and Reel

Typical Application

SOT-23

DS100893-1

Top View

See NS Package Number MA03B

DS100893-2

Temperature (T)

Typical V

O

+90˚C

+1884 mV

+70˚C

+1572 mV

+25˚C

870 mV

0˚C

+480 mV

FIGURE 1. Full-Range Centigrade Temperature Sensor

(0˚C to +90˚C) Stabilizing a Crystal Oscillator

June 1999

© 1999 National Semiconductor Corporation

DS100893

www.national.com