The LM5143-Q1 includes an internal junction temperature monitor. If the temperature exceeds 175°C (typical), thermal shutdown occurs. When entering thermal shutdown, the device:

1. Turns off the high-side and low-side MOSFETs
2. Pulls SS1/2 and PG1/2 low
3. Turns off the VCC regulator
4. Initiates a soft-start sequence when the die temperature decreases by the thermal shutdown hysteresis of 15°C (typical)

This is a non-latching protection, and as such, the device cycles into and out of thermal shutdown if the fault persists.