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LM27-2PLMDA Datasheet(PDF) 1 Page - Texas Instruments |
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LM27-2PLMDA Datasheet(HTML) 1 Page - Texas Instruments |
1 / 17 page LM27-2HJ V+=2.7V to 5.5V VTEMP GND HYST OS HYST REF TEMP SENSOR + - HYST=GND for 10 oC Hysteresis HYST=V+ for 2 oC Hysteresis VTEMP=(-3.552x10 -6x(T-30)2)+(-10.69576x10-3x(T-30))+1.8386V TOS TOS- THYST Temp. of Leads OS 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 1 FEATURES DESCRIPTION The LM27 is a precision, single digital-output, low- 2 • Internal Comparator with Pin Selectable 2°C or power thermostat comprised of an internal reference, 10°C Hysteresis DAC, temperature sensor and comparator. Utilizing • No External Components Required factory programming, it can be manufactured with • Open-drain or Push-pull Digital Output; different trip points as well as different digital output functionality. The trip point (TOS) can be preset at the Supports CMOS Logic Levels factory to any temperature in the range of +120°C to • Internal Temperature Sensor with VTEMP Output +150°C in 1°C increments. The LM27 has one digital Pin output (OS/OS/US/US), one digital input (HYST) and • VTEMP Output Allows After-assembly System one analog output (VTEMP). The digital output stage Testing can be preset as either open-drain or push-pull. In addition, it can be factory programmed to be active • Internal Voltage Reference and DAC for Trip- HIGH or LOW. The digital output can be factory point Setting programmed to indicate an over temperature • Currently Available in 5-pin SOT-23 Plastic shutdown event (OS or OS) or an under temperature Package shutdown event (US or US). When preset as an • Excellent Power Supply Noise Rejection 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 APPLICATIONS below (TOS–THYST). Similarly, when preprogrammed • Microprocessor Thermal Management as an undertemperature shutdown (US) it will go • Appliances HIGH to indicate that the temperature is below TUS and go LOW when the temperature is above • Portable Battery Powered Systems (TUS+THYST). The typical hysteresis, THYST, can be set • Fan Control to 2°C or 10°C and is controlled by the state of the • Industrial Process Control HYST pin. A VTEMP analog output provides a voltage that is proportional to temperature and has a • HVAC Systems −10.7mV/°C output slope. • Electronic System Protection Currently, there are several standard parts available, see Table 1. For other part options, contact a Texas KEY SPECIFICATIONS Instruments Distributor or Sales Representative for • Power Supply Voltage 2.7V to 5.5V information on minimum order qualification. The • Power Supply Current 40 μA (Max), 15μA (Typ) LM27 is currently available in a 5-lead SOT-23 package. • Hysteresis Temperature 2°C or 10°C (Typ) • Temperature Trip Point Accuracy ±3°C (Max) Simplified Block Diagram and Connection Diagram LM27CIM5-2HJ (140°C Trip-Point) 1 Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet. 2 All trademarks are the property of their respective owners. PRODUCTION DATA information is current as of publication date. Copyright © 2002–2013, Texas Instruments Incorporated Products conform to specifications per the terms of the Texas Instruments standard warranty. Production processing does not necessarily include testing of all parameters. |
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