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LM27

Texas Instruments
Part Number LM27
Manufacturer Texas Instruments
Description Factory Preset Thermostat
Published May 5, 2020
Detailed Description LM27 www.ti.com SNIS124D – AUGUST 2002 – REVISED JULY 2013 LM27 SOT-23, ±3°C Accurate, 120°C-150°C Factory Preset The...
Datasheet PDF File LM27 PDF File

LM27
LM27

Overview
LM27 www.
ti.
com SNIS124D – AUGUST 2002 – REVISED JULY 2013 LM27 SOT-23, ±3°C Accurate, 120°C-150°C Factory Preset Thermostat Check for Samples: LM27 FEATURES 1 •2 Internal Comparator with Pin Selectable 2°C or 10°C Hysteresis • No External Components Required • Open-drain or Push-pull Digital Output; Supports CMOS Logic Levels • Internal Temperature Sensor with VTEMP Output Pin • VTEMP Output Allows After-assembly System Testing • Internal Voltage Reference and DAC for Trip- point Setting • Currently Available in 5-pin SOT-23 Plastic Package • Excellent Power Supply Noise Rejection APPLICATIONS • Microprocessor Thermal Management • Appliances • Portable Battery Powered Systems • Fan Control • Industrial Process Control • HVAC Systems • Electronic System Protection KEY SPECIFICATIONS • Power Supply Voltage 2.
7V to 5.
5V • Power Supply Current 40μA (Max), 15μA (Typ) • Hysteresis Temperature 2°C or 10°C (Typ) • Temperature Trip Point Accuracy ±3°C (Max) DESCRIPTION The LM27 is a precision, single digital-output, lowpower thermostat comprised of an internal reference, DAC, temperature sensor and comparator.
Utilizing factory programming, 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 +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 (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 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 TOS and go HIGH when the temperature goes below (TOS–THYST).
Similarly, when preprogrammed as...


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