The LM5145 includes an internal junction
temperature monitor. If the temperature exceeds 175°C (typical), thermal shutdown
occurs. When entering thermal shutdown, the device:
- Turns off the high-side and
low-side MOSFETs.
- Pulls SS/TRK and PGOOD
low.
- Turns off the VCC
regulator.
- Initiates a soft-start
sequence when the die temperature decreases by the thermal shutdown
hysteresis of 20°C (typical).
This is a non-latching protection, and the device will cycle into and out of
thermal shutdown if the fault persists.