SBOS583B December   2011  – December 2016 TMP709

PRODUCTION DATA.  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
  4. 4 Revision History
  5. 5 Pin Configuration and Functions
  6. 6 Specifications
    1. 6.1 Absolute Maximum Ratings
    2. 6.2 ESD Ratings
    3. 6.3 Recommended Operating Conditions
    4. 6.4 Thermal Information
    5. 6.5 Electrical Characteristics
    6. 6.6 Typical Characteristics
  7. 7 Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
    3. 7.3 Feature Description
      1. 7.3.1 Temperature Switch
      2. 7.3.2 Hysteresis Input
      3. 7.3.3 Set-Point Resistor (RSET)
    4. 7.4 Device Functional Modes
  8. 8 Applications and Implementation
    1. 8.1 Application Information
    2. 8.2 Typical Application
      1. 8.2.1 Design Requirements
      2. 8.2.2 Detailed Design Procedure
      3. 8.2.3 Application Curves
  9. 9 Power Supply Recommendations
  10. 10Layout
    1. 10.1 Layout Guidelines
    2. 10.2 Layout Example
    3. 10.3 Thermal Considerations
  11. 11Device and Documentation Support
    1. 11.1 Receiving Notification of Documentation Updates
    2. 11.2 Community Resources
    3. 11.3 Trademarks
    4. 11.4 Electrostatic Discharge Caution
    5. 11.5 Glossary
  12. 12Mechanical, Packaging, and Orderable Information

10 Layout

10.1 Layout Guidelines

The TMP709 is extremely simple to lay out. Figure 7 shows the recommended board layout.

10.2 Layout Example

TMP709 TMP70x_Layout.gif Figure 7. Recommended Layout

10.3 Thermal Considerations

The TMP709 quiescent current is typically 40 μA. The device dissipates negligible power when the output drives a high-impedance load. Thus, the die temperature is the same as the package temperature. In order to maintain accurate temperature monitoring, provide a good thermal contact between the TMP709 package and the device being monitored. The rise in die temperature as a result of self-heating is given by Equation 2:

Equation 2. ΔTJ = PDISS × θJA

where

  • PDISS = power dissipated by the device.
  • θJA = package thermal resistance. Typical thermal resistance for SOT-23 package is 217.9°C/W.

To limit the effects of self-heating, keep the output current at a minimum level.