Electronic – Automotive power filtering, protection – feedback needed

automotivepower supply

I'm working on GPS tracker for automotive applications. Device should work in 9V-30V supply voltage range. In practice it will be fed from 12V car installation. This enforces the implementation of some protection/filtering circuit at the power input.

After reading some threads on load dumps, voltage transients, reversed polarity connection I feel a little confused. I'm not sure that design I came up with would stand against those hazards.

I'm also wondering if this could be done with less part count. I'm stuck with fuse selection as well. Should I use glass or PTC in this case.

I would appreciate any feedback on the following circuit.
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Best Answer

You might wish to consider an automotive rated Varistor (Littlefuse AUML series or similar component) which should be as close to the input as possible. Also, make sure that your regulator can withstand the clamped voltage during a load dump.

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