8.3.7.3.1 Short-Circuit and Overload Protection

A short-circuit protection feature protects the LP8752x-Q1 device itself and its external components against short circuit at the output or against overload during start-up. The fault threshold is 350 mV, the protection is triggered, and the regulator is disabled if the output voltage is below the threshold level of 1 ms after the regulator is enabled.

In a similar way the overload situation is protected during normal operation. If the voltage on the feedback pin of the regulator falls to less than 0.35 V and stays lower the threshold level for 1 ms, the regulator is disabled.

In short-circuit and overload situations the BUCKx_SC_INT (in INT_BUCKx register) and the INT_BUCKx bits (in INT_TOP1 register) are set to 1, the BUCKx_STAT bit (in BUCKx_STAT register) is set to 0, and the nINT signal is pulled low. The host processor clears the interrupt by writing 1 to the BUCKx_SC_INT bit. After clearing the interrupt the regulator makes a new start-up attempt if the regulator is in enabled state.