The BUCK1 overvoltage protection (OVP) is a built-in self-protection to limit the maximum output voltage of the BUCK1 regulator and protect external system peripherals supplied by the BUCK1 regulator. When a BUCK1 OVP condition is detected, the BUCK1_OVP_OFF_EN configuration bit setting selects the state of the device and BUCK1 regulator.

If the BUCK1_OVP_OFF_EN configuration bit is set to 1b, all of the following occurs:

• The device goes into the OFF state and all regulators are disabled.
• The BUCK1_OVP status bit is set and latched in the Analog_Latch to be preserved while the device is in the OFF state and presented to the system MCU during the next power-up event from the OFF state.

If the BUCK1_OVP_OFF_EN bit is set to 0b, all of the following occurs:

• The BUCK1 regulator is disabled.
• The device goes into the SAFE state.
  Note:

  As the BUCK1 output discharges to less than its UV threshold, a global RESET condition is met and the device eventually goes into the RESET state. When the device enters the RESET state, the BUCK1 regulator is enabled again (its default state). All the BUCK1 monitoring and protection mechanisms are active and, if any critical condition is still present, the BUCK1 regulator is disabled again. If the BUCK1 regulator never recovers while in the RESET state, the RESET state time-out event puts the device in the OFF state.

• The BUCK1 OVP status bit is set.
• The device error counter increments.
• The ENDRV/nIRQ pin is driven low.

The device error counter and its power-down threshold is a protection mechanism against multiple restarts caused by a persistent failure condition.