The system overvoltage protection is to prevent the SYS from overshooting to a high voltage due to the input supply. The SYS_OVP will momentarily disconnect the blocking FETs and re-engage when the thresholds have dropped to less than SYS_OVP_FALLING threshold.

SYS_OVP_RISING threshold is 104 to 106% of target SYS voltage and SYS_OVP_FALLING threshold is 101.5 to 103.5% of the target SYS voltage.