For a mixed signal device (analog part and digital part) I need to have multiple rails in order to make the device function properly.
I need in order:
-36V and +36V for analog output circuit (max current 500mA)
-24V +12V for the DAC part (100mA)
5V references, 3.3V reference, 2.5V reference. (for the DAC and digital part MCU, TFT display)
The goal is to power the device from12V mains transformer.
Now I have in mind using Webench to implement it with multiple IC in various configuration.
At least TPS55340 for the 36 and 24V rail, LM25776 for the -12V rail an so on.
I mean where is the issue on using on the same board different IC's in different topology?
Is there any helpful use of the SYNC pin?
Any help very appreciated as useful.