8.3.5.2.1 Short-Circuit and Overload Protection

A short-circuit protection feature allows the LP8758 to protect itself and external components against short circuit at the output or against overload during start-up. The fault threshold is 350 mV, and the protection is triggered, and the regulator disabled, if the output voltage is below the threshold level 1 ms after the regulator is enabled.

In a similar way the overload situation is protected during normal operation. If the regulator's feedback-pin voltage falls below 0.35 V, and remains below the threshold level for 1 ms, the regulator is disabled.

In the short-circuit and overload situations the INT_BUCK_0_1.BUCK0_SC_INT and the INT_TOP.INT_BUCK0 bits are set to 1, the BUCK_0_1_STAT.BUCK0_STAT bit is set to 0 and the nINT signal is pulled low. The host processor clears the interrupt by writing 1 to the INT_BUCK_0_1.BUCK0_SC_INT bit. Upon clearing the interrupt the regulator makes a new start-up attempt if the enable register bits and/or ENx control signal is valid.