LM27CIM5X-2HJ ,SOT-23, 3 Degree Celcious Accurate, 120-150 Degree Celcious Factory Preset ThermostatFeaturesof +120˚C to +150˚C in 1˚C increments. The LM27 has onen Internal comparator with pin selec ..
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LM2825N-3.3 ,Integrated Power Supply 1A DC-DC ConverterElectrical Characteristics (Note 4)=Specifications with standard type face are for T 25˚C, and thos ..
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LM6364 ,High Speed Operational AmplifierElectrical Characteristics The following specifications apply for Supply Voltage 15V, V 0,CMt e e e ..
LM27CIM5X-2HJ
SOT-23, 3 Degree Celcious Accurate, 120-150 Degree Celcious Factory Preset Thermostat
LM27
SOT-23, ±3˚C Accurate, 120˚C-150˚C Factory Preset
Thermostat
General DescriptionThe LM27isa precision, single digital-output, low-power
thermostat comprisedofan internal reference, DAC, tem-
perature sensor and comparator. Utilizing factory program-
ming,it canbe manufactured with differenttrip pointsas well different digital output functionality. The trip point (TOS)
canbe presetatthe factoryto any temperatureinthe range +120˚Cto +150˚Cin 1˚C increments. The LM27 has one
digital output (OS/OS/US/US), one digital input (HYST) and
one analog output (VTEMP). The digital output stage canbe
presetas either open-drainor push-pull.In addition,it canbe
factory programmedtobe active HIGHor LOW. The digital
output canbe factory programmedto indicatean over tem-
perature shutdown event (OSor OS)oran under tempera-
ture shutdown event (USor US). When presetasan over-
temperature shutdown (OS)it willgo LOWto indicate that
thedie temperatureis overthe internally preset TOS andgo
HIGH whenthe temperature goes below (TOS–THYST). Simi-
larly, when preprogrammedasan undertemperature shut-
down (US)itwillgo HIGHto indicate thatthe temperatureis
below TUS andgo LOW when the temperatureis above
(TUS+THYST). The typical hysteresis, THYST, canbe setto
2˚Cor 10˚C andis controlledbythe stateofthe HYST pin.A
VTEMP analog output providesa voltage thatis proportional temperature and hasa −10.7mV/˚C output slope.
Currently, there are several standard parts available, see
ordering informationfor details. For other part options, con-
tacta National Semiconductor Distributoror Sales Repre-
sentativefor informationon minimum order qualification. The
LM27is currently availableina 5-lead SOT-23 package.
Applications Microprocessor Thermal Management Appliances Portable Battery Powered Systems Fan Control Industrial Process Control HVAC Systems Electronic System Protection
Features Internal comparator withpin selectable 2˚Cor 10˚C
hysteresis No external components required Open-drainor push-pull digital output; supports CMOS
logic levels Internal temperature sensor with VTEMP outputpin VTEMP output allows after-assembly system testing Internal voltage reference and DACfor trip-point setting Currently availablein 5-pin SOT-23 plastic package Excellent power supply noise rejection
Key Specifications Power Supply Voltage 2.7Vto 5.5V Power Supply Current 40µA(max)
15µA(typ) Hysteresis Temperature 2˚Cor 10˚C(typ) Temperature Trip Point Accuracy ±3˚C (max)
LM27CIM5-2HJ Simplified Block Diagram and Connection DiagramThe LM27CIM5-2HJ hasa fixed trip pointof 140˚C.
For other trip point and output function availability,
August 2002
LM27
SOT
-23,
3˚C
Accurate,
120˚C-150˚C
Factory
Preset
Thermostat
