LM56 - Dual Output Low Power Thermostat from the PowerWise® Family
Datasheet Packaging Samples & Pricing Reliability Application Notes Knowledge Base

Features
•Digital outputs support TTL logic levels
•Internal temperature sensor
•2 internal comparators with hysteresis
•Internal voltage reference
•Available in 8-pin SO and Mini-SO8 plastic packages

Key Specification

■  Power Supply Voltage 2.7V–10V
■  Power Supply Current 230 μA (max)
■  VREF 1.250V ±1% (max)
■  Hysteresis Temperature 5°C
■  Internal Temperature Sensor Output Voltage:
(+6.20 mV/°C x T) + 395 mV

  • 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)

    General Description

    The LM56 is a precision low power thermostat. More...


    Applications

    •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
    		  Typical Application
    click for larger image


    ParametersValues
    SetPoint Type Resistor Selectable
    Temperature Accuracy (+/-) 2, 3 deg C
    Supply Min 2.7 Volt
    Temperature Min -40 deg C
    Temperature Max 125 deg C
    Quiescent Current_ 230 uA
    Comparators 2
    Sensor Gain 6.2 mV/Deg C
    Remote Diode Thermal Sensors Undefined
    Supply Max 10 Volt
    VtempOutput Impedance 1500 Ohm
    Reference Output 1.25 Volt
    Quiescent Current 0.23 mA
    PowerWise Yes


    Typical Performance

    click for larger image


    		  Additional Resources
    Application Notes


    Block Diagram

    *click for larger image



    Datasheet
    RoHS Compliance Information Size in KbytesDate Click link below to Download
    LM56 Dual Output Low Power Thermostat 500
    Kbytes    		 22-Aug-09 Download
    LM56 Dual Output Low Power Thermostat (Japanese)
    		 646 Kbytes   Download

    If you have trouble printing or viewing PDF file(s), see Printing Problems.


    Package Availability, Models, Samples & Pricing
    Part NumberPackageFactory Lead TimeModelsSamples &
    Electronic
    Orders    		Budgetary PricingStd
    Pack
    Size    		Package
    Marking
    Format
    TypePinsSpec.MSL
    Rating    		Peak
    Reflow    		RoHS
    Report    		CAD
    Symbols    		WeeksQtyQty$US each
    LM56BIMSOIC NARROW8NOPB
    STD    		1
    1    		260
    235    		RoHS Download Full productionN/A
    		Samples
    Buy Now     		1K+$0.85rail
    of
    95    		NSZXTT
    LM56
    BIM
    6 weeks1000
    LM56CIMSOIC NARROW8NOPB
    STD    		1
    1    		260
    235    		RoHS Download Full productionN/A
    		Samples
    Buy Now     		1K+$0.69rail
    of
    95    		NSZXTT
    LM56
    CIM
    8 weeks1000
    LM56BIMXSOIC NARROW8NOPB
    STD    		1
    1    		260
    235    		RoHS Download Full productionN/A
    		 
    Buy Now     		1K+$0.85reel
    of
    2500    		NSZXTT
    LM56
    BIM
    8 weeks3000
    LM56CIMXSOIC NARROW8NOPB
    STD    		1
    1    		260
    235    		RoHS Download Full productionN/A
    		 
    Buy Now     		1K+$0.69reel
    of
    2500    		NSZXTT
    LM56
    CIM
    6 weeks3000
    LM56BIMMMINI SOIC8NOPB
    STD    		1
    1    		260
    260    		RoHS Download Full productionN/A
    		Samples
    Buy Now     		1K+$1.00reel
    of
    1000    		ZXTT
    T02B
    6 weeks2500
    LM56CIMMMINI SOIC8NOPB
    STD    		1
    1    		260
    260    		RoHS Download Full productionN/A
    		Samples
    Buy Now     		1K+$0.76reel
    of
    1000    		ZXTT
    T02C
    6 weeks2000
    LM56BIMMXMINI SOIC8NOPB1260RoHS Download Full productionN/A
    		 
    Buy Now     		1K+$1.00reel
    of
    3500    		ZXTT
    T02B
    12 weeksN/A
    LM56CIMMXMINI SOIC8NOPB1260RoHS Download Full productionN/A
    		 
    Buy Now     		1K+$0.76reel
    of
    3500    		ZXTT
    T02C
    6 weeks10000

    General Description

    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 (T1–THYST). Similarly, OUT2 goes LOW when the temperature exceeds T2 and goes HIGH when the temperature goes below (T2–THYST). 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.

    Reliability Metrics

    Part Number Process EFR Reject EFR Sample Size PPM LTA Rejects LTA Device Hours FITS MTTF (Hours)
    LM56BIMLFAST10195100026050002739175862
    LM56BIMMLFAST10195100026050002739175862
    LM56BIMMXLFAST10195100026050002739175862
    LM56BIMXLFAST10195100026050002739175862
    LM56CIMLFAST10195100026050002739175862
    LM56CIMMLFAST10195100026050002739175862
    LM56CIMMXLFAST10195100026050002739175862
    LM56CIMXLFAST10195100026050002739175862

    Note: The Early Failure Rates (EFR) were calculated as point estimate PPM based on rejects and sample size for EFR. The Long Term Failure Rates were calculated at 60% confidence using the Arrhenius equation at 0.7eV activation energy and derating the assumed stress temperature of 150°C to an application temperature of 55°C.

    For more information on Reliability Metrics, please click here.


    More Application Notes

    TitleSize in Kbytes Date Click link below to Download
    AN-1984: Application Note 1984 LM57 Temperature Switch vs Thermistors 210
    Kbytes    		 28-Jul-09 Download

    If you have trouble printing or viewing PDF file(s), see Printing Problems.

    [Information as of 8-Nov-2009]