I've noticed on almost all Arduino's or clones and verities thereof all use a LDO ps like the MC33269
Why never the DPAK type of the various 7805's?
Reliability, space, price, precision?
I've noticed on almost all Arduino's or clones and verities thereof all use a LDO ps like the MC33269
Why never the DPAK type of the various 7805's?
Reliability, space, price, precision?
I think people are trying to become more energy efficient (being able to feed in about 6.5 volts instead of 8-9).
It seems to be the way everyone is swinging, but I still prefer the 7805 :).
It strikes me that there's a bit of a catch-22 if you need lots of current. The MC33269 can run off a lower input voltage so it'll drop less and make less heat, but the 7805 has a higher ceiling in terms of output current limit.
Also strikes me that the 7805 has "worse" voltage tolerances (.25v seems typical?)
It really sucks that they're not pin-compatible, because that would mean you could design a universal circuit and let the end user pick.
Reliability, space, price, precision?
I would say price. For the performance the MC33269 is a good value.
Unfortunately the pinout is different. There is also a unusual ESR
requirement that does require caps that are a little more expensive.
Another factor may be age. A lot of people are familiar with the
part. The datasheet I have is dated 2006 and is Rev 22
(* jcl *)
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