LM66

Dual Output Internally Preset Thermostat

General Description

The LM66 is a precision low power thermostat. Two stable

temperature trip points (V

ing down the LM66 1.250V bandgap voltage reference using

a resistors divider network. The LM66 has two digital out-

puts. OUT1 goes LOW when the temperature exceeds T1

and goes HIGH when the the temperature goes below

(T1–T

ture exceeds T2 and goes HIGH when the temperature goes

below (T2–T

teresis.

The LM66 is currently available in an 8-lead small outline

package.

Applications

n

Microprocessor Thermal Management

n

Appliances

n

Portable Battery Powered 3.0V or 5V Systems

n

Fan Control

n

Industrial Process Control

n

HVAC Systems

n

Remote Temperature Sensing

n

Electronic System Protection

Features

n

Digital outputs support TTL logic levels

n

Internal temperature sensor

n

2 internal comparators with hysteresis

n

Internal voltage reference

n

Currently available in 8-pin SO plastic package

Key Specifications

n

Power Supply Voltage

2.7V to 10V

n

Power Supply Current

250 µA (max)

n

V

REF

n

Hysteresis Temperature

5˚C

n

Internal Temperature Sensor

Output Voltage

(+6.20 mV/˚C x T) +400 mV

n

Temperature Trip Point Accuracy

n

T1 set point

+73˚C

n

T2 set point

+82˚C

Simplified Block Diagram and

Connection Diagram

Ordering Information

TABLE 1.

Order Number

LM66CIM-

RLSKB

LM66CIMX-

RLSKB

NS Tackage

Number

M08A

M08A

Transport Media

Bulk Rail

2500 Units Tape

& Reel

Typical Application

DS100854-1

DS100854-2

DS100854-3

April 2000

© 2000 National Semiconductor Corporation

DS100854

www.national.com