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National Semiconductor - Accurate/ Factory Preset Thermostat

Numéro de référence LM26CIM5-VHA
Description Accurate/ Factory Preset Thermostat
Fabricant National Semiconductor 
Logo National Semiconductor 





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LM26CIM5-VHA fiche technique
May 2001
LM26
SOT-23, ±3˚C Accurate, Factory Preset Thermostat
General Description
The LM26 is a precision, single digital-output, low-power
thermostat comprised of an internal reference, DAC, tem-
perature sensor and comparator. Utilizing factory program-
ming, it can be manufactured with different trip points as well
as different digital output functionality. The trip point (TOS)
can be preset at the factory to any temperature in the range
of −55˚C to +110˚C in 1˚C increments. The LM26 has one
digital output (OS/OS/US/US), one digital input (HYST) and
one analog output (VTEMP). The digital output stage can be
preset as either open-drain or push-pull. In addition, it can be
factory programmed to be active HIGH or LOW. The digital
output can be factory programmed to indicate an over tem-
perature shutdown event (OS or OS) or an under tempera-
ture shutdown event (US or US). When preset as an over-
temperature shutdown (OS) it will go LOW to indicate that
the die temperature is over the internally preset TOS and go
HIGH when the temperature goes below (TOS–THYST). Simi-
larly, when preprogrammed as an undertemperature shut-
down (US) it will go HIGH to indicate that the temperature is
below TUS and go LOW when the temperature is above
(TUS+THYST). The typical hysteresis, THYST, can be set to
2˚C or 10˚C and is controlled by the state of the HYST pin. A
VTEMP analog output provides a voltage that is proportional
to temperature and has a −10.82mV/˚C output slope.
Available parts are detailed in the ordering information. For
other part options, contact a National Semiconductor Dis-
tributor or Sales Representative for information on minimum
order qualification. The LM26 is currently available in a
5-lead SOT-23 package.
Applications
n Microprocessor Thermal Management
n Appliances
n Portable Battery Powered Systems
n Fan Control
n Industrial Process Control
n HVAC Systems
n Remote Temperature Sensing
n Electronic System Protection
Features
n Internal comparator with pin programmable 2˚C or 10˚C
hysteresis
n No external components required
n Open Drain or push-pull digital output; supports CMOS
logic levels
n Internal temperature sensor with VTEMP output pin
n VTEMP output allows after-assembly system testing
n Internal voltage reference and DAC for trip-point setting
n Currently available in 5-pin SOT-23 plastic package
n Excellent power supply noise rejection
Key Specifications
j Power Supply Voltage
j Power Supply Current
j Hysteresis Temperature
2.7V to 5.5V
40µA(max)
20µA(typ)
2˚C or 10˚C(typ)
Temperature Trip Point Accuracy
Temperature Range
−55˚C to +110˚C
+120˚C
LM26CIM
±3˚C (max)
±4˚C (max)
LM26CIM5-TPA Simplified Block Diagram and Connection Diagram
The LM26CIM5-TPA has a fixed trip point of 85˚C.
For other trip point and output function availability,
please see ordering information or contact National Semiconductor.
10132301
© 2003 National Semiconductor Corporation DS101323
www.national.com

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