LM26NV Datasheet, PDF (1/12 Pages) National Semiconductor (TI) – SOT-23, ±3°C Accurate, Factory Preset Thermostat (LM26 without VTEMP output)

August 5, 2008
LM26NV
SOT-23, ±3°C Accurate, Factory Preset Thermostat
(LM26 without V_TEMP output)
General Description
The LM26NV is a precision, single digital-output, low-power
thermostat comprised of an internal reference, DAC, temper-
ature sensor and comparator. Utilizing factory programming,
it can be manufactured with different trip points as well as
different digital output functionality. The trip point (T_OS) can
be preset at the factory to any temperature in the range of
−55°C to +110°C in 1°C increments. The LM26NV has one
digital output (OS/OS/US/US) and one digital input (HYST).
The digital output stage can be preset as either open-drain or
push-pull. In addition, it can be factory programmed to be ac-
tive HIGH or LOW. The digital output can be factory pro-
grammed to indicate an over temperature shutdown event
(OS or OS) or an under temperature shutdown event (US or
US). When preset as an overtemperature shutdown (OS), it
will go LOW to indicate that the die temperature is over the
internally preset T_OS and go HIGH when the temperature
goes below (T_OS–T_HYST). Similarly, when preprogrammed as
an undertemperature shutdown (US) it will go HIGH to indi-
cate that the temperature is below T_US and go LOW when the
temperature is above (T_US+T_HYST). The typical hysteresis,
T_HYST, can be set to 2°C or 10°C and is controlled by the state
of the HYST pin.
Available parts are detailed in the ordering information. For
other part options, contact a National Semiconductor Distrib-
utor or Sales Representative for information on minimum
order qualification. The LM26NV is currently available in a 5-
lead SOT-23 package.
Applications
■ ^{Portable Battery Powered Systems}
■ ^{Fan Control}
■ ^{Industrial Process Control}
■ ^{HVAC Systems}
■ ^{Remote Temperature Sensing}
■ ^{Electronic System Protection}
Features
■ ^{Internal comparator with pin programmable 2°C or 10°C}
hysteresis
■ ^{No external components required}
■ ^{Open Drain or push-pull digital output; supports CMOS}
logic levels
■ ^{Internal temperature sensor}
■ ^{Internal voltage reference and DAC for trip-point setting}
■ ^{Currently available in 5-pin SOT-23 plastic package}
■ ^{Excellent power supply noise rejection}
Key Specifications
■ Power Supply Voltage
■ Power Supply Current
■ Hysteresis Temperature
2.7V to 5.5V
40µA(max)
20µA(typ)
2°C or 10°C(typ)
Temperature Trip Point Accuracy
Temperature Range LM26NV
■ ^{Microprocessor Thermal Management}
■ ^Appliances
−55°C to +110°C
+120°C
±3°C (max)
±4°C (max)
Connection Diagram
30075102
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