The LM5148 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.
- PG/SYNCOUT switches low.
- Turns off the VCC
regulator.
- 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.