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 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. 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) 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

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Datasheet

Title		Size	Date	Other Language
	LM56 Dual Output Low Power Thermostat	500 Kbytes	22-Aug-09	日本語

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Reliability Metrics

Part Number	Process	EFR Reject	EFR Sample Size	PPM	LTA Rejects	LTA Device Hours	FITS	MTTF (Hours)
LM56BIM	LFAST1	0	19510	0	0	2605000	2	739175862
LM56BIMM	LFAST1	0	19510	0	0	2605000	2	739175862
LM56BIMMX	LFAST1	0	19510	0	0	2605000	2	739175862
LM56BIMX	LFAST1	0	19510	0	0	2605000	2	739175862
LM56CIM	LFAST1	0	19510	0	0	2605000	2	739175862
LM56CIMM	LFAST1	0	19510	0	0	2605000	2	739175862
LM56CIMMX	LFAST1	0	19510	0	0	2605000	2	739175862
LM56CIMX	LFAST1	0	19510	0	0	2605000	2	739175862

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.

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