@OYPS Ah, 2.5V is just a "benchmark" for you to "extrapolate". I think your choice is already very good. It would be perfect if you can find something similar, but with a DPAK package which has a SMD heatsink. :)

@OYPS So far we are discussing on low side current switching. You might like to explore high side switching, as shown below.

Yet there is one more switching configuration, or constant current switching/limiting/source called "True Floating CCS", which sits between Vcc and ground, in other words, and does not connect to Vcc or ground, as referred above:

@OYPS This is P-channel power MOSFET, also very low level Vgs(th) which you might consider high side switching.

@tlfong01 Thanks for your reply. What is the advantage/disadvantage of high or low side switching ?

On which use case would I choose on over the other?

Are the 250mOhm a problem? Some answers on the original question suggested, that Rdson could/should be lower than 200mohm. As far as I understand it, I should just try to

* minimize this