LM26 Temperature Switch with Fixed Trip Points | TI.com

LM26 (ACTIVE)

Temperature Switch with Fixed Trip Points

 

Description

The LM26 is a precision, single digital-output, low-power 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 −55°C to 110°C in 1°C increments. The LM26 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 an undertemperature shutdown (US) it will go HIGH to indicate that the temperature is below TUS and go LOW when the temperature is above (TUS+THYST). The typical hysteresis, THYST, can be set to 2°C or 10°C and is controlled by the state of the HYST pin. A VTEMP analog output provides a voltage that is proportional to temperature and has a −10.82 mV/°C output slope.

Available parts are detailed in the Device Comparison Table. For other part options, contact a Texas Instruments Distributor or Sales Representative for information on minimum order qualification. The LM26 is currently available in a 5-lead SOT-23 package.

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 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
  • UL Recognized Component
  • Key Specifications
    • Power Supply Voltage 2.7 V to 5.5 V
    • Power Supply Current
      40 µA (Maximum) 16 µA (Typical)
    • Hysteresis Temperature 2°C or 10°C (Typical)

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Parametrics Compare all products in Temperature switches

 
Operating temperature range (C)
Accuracy over temp range (Max) (C)
Sensor Gain (mV/Deg C)
SetPoint Value (deg C)
SetPoint Type
Output type
Supply Voltage (Min) (V)
Supply Voltage (Max) (V)
Supply Current (Typ) (uA)
Comparator channels (#)
Features
Rating
Package Group
Package size: mm2:W x L (PKG)
Interface
LM26 LM26LV LM26LV-Q1 LM27 LM56
-55 to 125     0 to 150     -40 to 150     120 to 150     -40 to 125    
3     2.3     2.3     3     3    
-10.82     -5.1 to -12.8     -5.1 to -12.8     -10.82     6.2    
Range (-55 to 110)
-45, -25, 0, 45
50, 65, 70, 75
85, 90, 95, 100
105, 110, 115, 120    
Range (0 to 150)
50, 60, 65, 70
75, 80, 85, 90
95, 100, 105, 110
115, 120, 125, 130
135, 140, 145, 150    
Range (0 to 150)
130, 135    
Range (120 to 150)
120, 130, 140    
-40 to 125    
Factory Programmed     Factory Programmed     Factory Programmed     Factory Programmed     Resistor Programmable    
Open Drain
Push Pull    
Open Drain
Push Pull    
Open Drain
Push Pull    
Open Drain
Push Pull    
Open Drain    
2.7     1.6     1.6     2.7     2.7    
5.5     5.5     5.5     5.5     10    
40     8     8     40     230    
1     1     1     1     2    
Hysteresis (2°C or 10°C)
Pin-Selectable Hysteresis
Temperature Sensor and Switch
UL Recognized    
Built-in Hysteresis
Hysteresis (5°C)
Temperature Sensor and Switch
Trip Test    
Built-in Hysteresis
Hysteresis (5°C)
Temperature Sensor and Switch
Trip Test    
Hysteresis (2°C or 10°C)
Pin-Selectable Hysteresis
Temperature Sensor and Switch
UL Recognized    
Built-in Hysteresis
Hysteresis (5°C)
Temperature Sensor and Switch    
Catalog     Catalog     Automotive     Catalog     Catalog    
SOT-23 | 5     WSON | 6     WSON | 6     SOT-23 | 5     SOIC | 8
VSSOP | 8    
5SOT-23: 8 mm2: 2.8 x 2.9 (SOT-23 | 5)     See datasheet (WSON)     See datasheet (WSON)     5SOT-23: 8 mm2: 2.8 x 2.9 (SOT-23 | 5)     8SOIC: 29 mm2: 6 x 4.9 (SOIC | 8)
8VSSOP: 15 mm2: 4.9 x 3 (VSSOP | 8)    
Analog Output
Switch    
Analog Output
Switch    
Analog Output
Switch    
Analog Output
Switch    
Analog Output
Switch