LM56

·Digital outputs support TTL logic levels
·Internal temperature sensor
·2 internal comparators with hysteresis
·Internal voltage reference
·Currently available in 8-pin SO plastic package
·Future availability in the 8-pin Mini-SO8 package

· Microprocessor Thermal Management
·Appliances
· Portable Battery Powered 3.0V or 5V Systems
·Fan Control
·Industrial Process Control
· HVAC Systems
·Remote Temperature Sensing
· Electronic System Protection

Input Voltage ................................................................................12V
Input Current at any pin (Note 2) ...............................................5 mA
Package Input Current(Note 2) .................................................20 mA
Package Dissipation at T_A = 25°C
(Note 3) ...................................................................................900 mW
ESD Susceptibility (Note 4)
Human Body Model .....................................................................1000V
Machine Model ..............................................................................200V
Soldering Information
SO Package (Note 5) :
Vapor Phase (60 seconds) .........................................................215°C
Infrared (15 seconds) ................................................................220°C
Storage Temperature .............................................−65°C to + 150°C

The LM56 is a precision low power thermostat. Two stable temperature trip points (VT1 and VT2) are generated by dividing down the LM56 1.250V bandgap voltage reference using 3 external resistors. The LM56 has two digital outputs. OUT1 goes LOW when the temperature exceeds T1 and goes HIGH when the the temperature goes below (T1THYST). Similarly, OUT2 goes LOW when the temperature exceeds T2 and goes HIGH when the temperature goes below (T2THYST). THYST is an internally set 5°C typical hysteresis.

The LM56 is available in an 8-lead Mini-SO8 surface mount package and an 8-lead small outline package.