SNIS115S May   2001  – September 2015 LM26

PRODUCTION DATA.  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
  4. 4 Revision History
  5. 5 Device Comparison Table
  6. 6 Pin Configuration and Functions
  7. 7 Specifications
    1. 7.1 Absolute Maximum Ratings
    2. 7.2 ESD Ratings
    3. 7.3 Recommended Operating Conditions
    4. 7.4 Thermal Information
    5. 7.5 Electrical Characteristics
    6. 7.6 Typical Characteristics
  8. 8 Detailed Description
    1. 8.1 Overview
    2. 8.2 Functional Block Diagrams
    3. 8.3 Feature Description
      1. 8.3.1 Hysteresis
      2. 8.3.2 VTEMP Output
    4. 8.4 Device Functional Modes
      1. 8.4.1 After Assembly PCB Testing
  9. 9 Application and Implementation
    1. 9.1 Application Information
    2. 9.2 Typical Application
      1. 9.2.1 Design Requirements
      2. 9.2.2 Detailed Design Procedure
      3. 9.2.3 Application Curve
    3. 9.3 System Examples
  10. 10Power Supply Recommendations
  11. 11Layout
    1. 11.1 Layout Guidelines
    2. 11.2 Layout Example
    3. 11.3 Thermal Considerations
  12. 12Device and Documentation Support
    1. 12.1 Community Resources
    2. 12.2 Trademarks
    3. 12.3 Electrostatic Discharge Caution
    4. 12.4 Glossary
  13. 13Mechanical, Packaging, and Orderable Information

Package Options

Mechanical Data (Package|Pins)
Thermal pad, mechanical data (Package|Pins)
Orderable Information

1 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 LM26 rumark.png
  • 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)

2 Applications

  • Microprocessor Thermal Management
  • Appliances
  • Portable Battery Powered Systems
  • Fan Control
  • Industrial Process Control
  • HVAC Systems
  • Remote Temperature Sensing
  • Electronic System Protection

3 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.

Device Information(1)

PART NUMBER PACKAGE BODY SIZE (NOM)
LM26 SOT-23 (5) 2.90 mm × 1.60 mm
  1. For all available packages, see the orderable addendum at the end of the datasheet.

LM26CIM5-TPA Simplified Block Diagram and Connection Diagram

LM26 10132301.gif
The LM26CIM5-TPA has a fixed trip point of 85°C. For other trip point and output function availability, please see the Device Comparison Table or contact Texas Instruments.