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LDO internal MOSFET was burned-out (TPS780, TLV700) due to reverse voltage

Alexey Bagaev
Genius 5090 points
Other Parts Discussed in Thread: TPS780, TLV700

Hi,

I had an issue with my setup. LDOs in my Launchpad (TLV700) and custom-made booster-pack (TPS780) has been burned-out due to my mistake - I had plug-in power supply with reverse voltage to +5V/GND rail, I assume, internal MOSFETs on all connected devices were destroyed by very high current (>40A capable power source). Now all LDOs provide 3.7V instead of 3.3V. So, how can I protect such devices in the future? Should I use external powerful P-MOSFETs? How can I eliminate current leakage and voltage dropout in such a setup?

Thanks,

Alexey