LM56

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SNIS120G – APRIL 2000 – REVISED FEBRUARY 2013

LM56 Dual Output Low Power Thermostat

Check for Samples: LM56

1

FEATURES

DESCRIPTION

The LM56 is a precision low power thermostat. Two

2

•

Digital Outputs Support TTL Logic Levels

•

Internal Temperature Sensor

generated

by

dividing

down

the

LM56

1.250V

•

2 Internal Comparators with Hysteresis

bandgap voltage reference using 3 external resistors.

The LM56 has two digital outputs. OUT1 goes LOW

•

Internal Voltage Reference

when the temperature exceeds T1 and goes HIGH

•

Available in 8-pin SOIC and VSSOP Packages

Similarly, OUT2 goes LOW when the temperature

APPLICATIONS

exceeds T2 and goes HIGH when the temperature

•

Microprocessor Thermal Management

typical hysteresis.

•

Appliances

The LM56 is available in an 8-lead VSSOP surface

•

Portable Battery Powered 3.0V or 5V Systems

mount package and an 8-lead SOIC.

•

Fan Control

•

Industrial Process Control

•

HVAC Systems

•

Remote Temperature Sensing

•

Electronic System Protection

Table 1. Key Specifications

VALUE

UNIT

Power Supply Voltage

2.7V–10

V

Power Supply Current

230

μA (max)

1.250

V ±1% (max)

Hysteresis Temperature

5

°C

(+6.20 mV/°C x T) +

Internal Temperature Sensor Output Voltage

mV

395 mV

Table 2. Temperature Trip Point Accuracy

LM56BIM

LM56CIM

+25°C

±2°C (max)

±3°C (max)

+25°C to +85°C

±2°C (max)

±3°C (max)

−40°C to +125°C

±3°C (max)

±4°C (max)

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2

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PRODUCTION DATA information is current as of publication date.

Copyright © 2000–2013, Texas Instruments Incorporated

Products conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.