5V bus and 3.3V bus

[FredFl]

...

[TugBoat]

Personally I would run all the power supplies from the 10V input, rather than cascading the regulators. In the end the power dissipation is the same...

If you really need a stable MCU supply then you need to look at something with suitable transient response. Things like the LT1587CM-3.3 (there are lots of similar parts designed specificially for MCU power supplies).

Also you need to use suitable capacitors with low ESR/low ESL and good frequency charactistics.