LM27

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 ...