SDAA247 January   2026 TPS2HCS10-Q1

 

  1.   1
  2.   Abstract
  3.   Trademarks
  4. 1Introduction
  5. 2Melting Fuse Performance
    1. 2.1 Current Rating
    2. 2.2 Rerating Curve
    3. 2.3 I2T Values
      1. 2.3.1 Melting I2T
      2. 2.3.2 Arcing I2T
      3. 2.3.3 Total Clearing I2T
      4. 2.3.4 Fuse I2T Considerations
    4. 2.4 Opening Time
    5. 2.5 Voltage Rating
  6. 3TI Smart eFuse High-Side Switch Performance
    1. 3.1 Process/Voltage/Temperature Considerations
      1. 3.1.1 Max Operating Temperature
    2. 3.2 I2T Curve
      1. 3.2.1 Nominal Current Threshold (INOM)
      2. 3.2.2 I2T Fuse Threshold
      3. 3.2.3 Fixed-Delay Shutdown Threshold
      4. 3.2.4 Immediate Overcurrent Protection Threshold (IOCP)
    3. 3.3 Additional Protections and Diagnostics
      1. 3.3.1 Additional Protections
        1. 3.3.1.1 Short-to-Ground Protection
        2. 3.3.1.2 Capacitive Charging
        3. 3.3.1.3 Limp Home Mode/Watchdog/CRC
        4. 3.3.1.4 Reverse Battery Protection
        5. 3.3.1.5 Loss of Battery/Ground Protection
        6. 3.3.1.6 Integrated Inductive Discharge
      2. 3.3.2 Additional Diagnostics
  7. 4Switching from Melting Fuse to TI Smart eFuse High-Side Switch
    1. 4.1 Melting Fuse Design
    2. 4.2 Current Rating
    3. 4.3 I2T Trip Times
  8. 5Summary
  9. 6References

2.3.3 Total Clearing I2T

This is the total I2T value that the load sees, and this value should be below the load's and supply's short circuit withstand capabilities and wire's I2T threshold. As can be seen, the total I2T value that a system's wiring sees is higher than the melting I2T value, and thus wires are often overengineered to not be damaged by the arcing I2T.