I need a buck converter that can deliver:
input voltage: +12v and more.
output: go down to 3.3v and 5v, 12v too if supply is more.
ripple and noise: I want below 1mV total. and prefer in the 10uV range regardless of how clean the input supply is, since it is gonna be yet another DC_DC converter with much ripple.
output current: up to 4 amps, since 3 amps is gonna be continuous load.