SNVSC24 April 2021 LP8758-EA
A short-circuit protection feature allows the LP8758-EA 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 converter core is disabled if the output voltage is still below the threshold level 1 ms after the converter core was enabled.
In a similar way the overload situation is protected during normal operation. If a feedback-pin voltage falls below 0.35 V, and remains below the threshold level for 1 ms, the respective converter core is disabled.
For example, if the Buck core 0 output is overloaded, then 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. The regulator makes a new start-up attempt (upon clearing the interrupt) if the enable register bits, ENx control signal, or both are valid.