Working on the 2nd revision of my first-ever PCB design which is basically a "smart", high-side half-bridge driver for use in 12VDC automotive applications (aftermarket).
I'm using a nice IC for the load switching between Vbatt and Vout that has reverse polarity protection built in. I pull power from Vbatt through an LM7805 to run the MCU and other logic-level stuff. While researching reverse polarity protection, I found a recent discussion here with
this comment at the end which was helpful. I didn't want to hijack that thread so created this one to ask: is my use case here one where a low-side diode is a good choice for reverse polarity protection?
My 2-layer board uses almost the whole bottom surface as a ground plane, and with 4 wires on the thing I felt like GND was the logical, central spot to try to stop wrong-way flow. It's hard to guess all the wrong ways someone could try to hook the thing up, so I put a
B260S1F where shown on this lovely schematic (between the GND wire and the GND plane of the board). I didn't want the voltage drop from the diode on - for example - the CTL (control) input wire even though I could've tolerated it on the input to the 7805.
Now I'm curious about where this falls on the spectrum of "unconventional" to "wrong in many ways" - appreciate any insights!
EDIT: Reworded slightly to try to make it more clear.