Hello,
I am designing a device that needs 3v3 and 0.6Amps, 10v and 0.15Amps besides a backup battery, for source the 3v3 only, I have several concerns, the first one is the frequencies cause I'm going to use buck converters, If those DC DC working at different frequencies could give problems?. Reading in several pages say that could be a good practice to put a filter LC between DC DC converters, should I to do that? My idea is supply the 10V source with a 12V to 16V power supply, and the 10V could supply power to the battery charger a bq24074, and then supply a buck boost converter like the TPS63031, with this the 10V should be not of 0.15Amps, originally used only for a PWM, but 0.75Amps because it has to supply the bq24074and the 3v3. The bq24074 datasheet says that can handle the 10V so it is not an issue.
According to the grafic, am I right with my assumption or should I change it, please any recommendation would be a great help
Regards
ANDRES