- No fault_b won’t be reset after power cycle. The effective way to reset the pin state is to apply Vdd voltage to VOC pin, 5.0V in this case.
- Both VOUT and VREF still works properly even the over current event happened.
- Your propose to wired multiple VOC pins simultaneously is doable, the input end of VOC is actually a ADC which will set the over current threshold depending on the input voltage. So wired VOC net among multiple parts together and supplied by one voltage source is fine. The other thing might be useful for you is the falut_b pins can be also connected together because it’s open-drain output type in this way you can implement OR function for over current detection application
Hope this helps,