LM19

2.4V, 10µA, TO-92 Temperature Sensor

General Description

The LM19 is a precision analog output CMOS integrated-

circuit temperature sensor that operates over a −55˚C to

+130˚C temperature range. The power supply operating

range is +2.4 V to +5.5 V. The transfer function of LM19 is

predominately linear, yet has a slight predictable parabolic

curvature. The accuracy of the LM19 when specified to a

ture of +30˚C. The temperature error increases linearly and

extremes. The temperature range is affected by the power

supply voltage. At a power supply voltage of 2.7 V to 5.5 V

the temperature range extremes are +130˚C and −55˚C.

Decreasing the power supply voltage to 2.4 V changes the

negative extreme to −30˚C, while the positive remains at

+130˚C.

The LM19’s quiescent current is less than 10 µA. Therefore,

self-heating is less than 0.02˚C in still air. Shutdown capa-

bility for the LM19 is intrinsic because its inherent low power

consumption allows it to be powered directly from the output

of many logic gates or does not necessitate shutdown at all.

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

Features

n

Rated for full −55˚C to +130˚C range

n

Available in a TO-92 package

n

Predictable curvature error

n

Suitable for remote applications

Key Specifications

+2.4V to +5.5V

10 µA (max)

160

Ω (max)

−2.5 mV (max)

Typical Application

Output Voltage vs Temperature

20004002

V

or

where:

20004024

FIGURE 1. Full-Range Celsius (Centigrade) Temperature Sensor (−55˚C to +130˚C)

Operating from a Single Li-Ion Battery Cell

January 2003

© 2003 National Semiconductor Corporation

DS200040

www.national.com