LM27 National Semiconductor, LM27 Datasheet
LM27
Manufacturer Part Number
LM27
Description
Factory Preset Thermostat
Manufacturer
National Semiconductor
Datasheet
1.LM27.pdf
(10 pages)
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© 2006 National Semiconductor Corporation
LM27
SOT-23,
Thermostat
General Description
The LM27 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 (T
can be preset at the factory to any temperature in the range
of +120˚C to +150˚C in 1˚C increments. The LM27 has one
digital output (OS/OS/US/US), one digital input (HYST) and
one analog output (V
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 T
HIGH when the temperature goes below (T
larly, when preprogrammed as an undertemperature shut-
down (US) it will go HIGH to indicate that the temperature is
below T
(T
2˚C or 10˚C and is controlled by the state of the HYST pin. A
V
to temperature and has a −10.7mV/˚C output slope.
Currently, there are several standard parts available, see
ordering information for details. For other part options, con-
tact a National Semiconductor Distributor or Sales Repre-
sentative for information on minimum order qualification. The
LM27 is currently available in a 5-lead SOT-23 package.
LM27CIM5-2HJ Simplified Block Diagram and Connection Diagram
TEMP
US
+T
HYST
analog output provides a voltage that is proportional
US
and go LOW when the temperature is above
). The typical hysteresis, T
±
TEMP
3˚C Accurate, 120˚C-150˚C Factory Preset
please see ordering information or contact National Semiconductor.
). The digital output stage can be
For other trip point and output function availability,
The LM27CIM5-2HJ has a fixed trip point of 140˚C.
HYST
DS200307
OS
, can be set to
–T
HYST
OS
). Simi-
and go
OS
)
Applications
n Microprocessor Thermal Management
n Appliances
n Portable Battery Powered Systems
n Fan Control
n Industrial Process Control
n HVAC Systems
n Electronic System Protection
Features
n Internal comparator with pin selectable 2˚C or 10˚C
n No external components required
n Open-drain or push-pull digital output; supports CMOS
n Internal temperature sensor with V
n V
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
j
j
j
hysteresis
logic levels
TEMP
Power Supply Voltage
Power Supply Current
Hysteresis Temperature
Temperature Trip Point Accuracy
output allows after-assembly system testing
TEMP
20030701
2˚C or 10˚C(typ)
September 2006
output pin
2.7V to 5.5V
www.national.com
±
40µA(max)
3˚C (max)
15µA(typ)
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