Electronics novice here... I hope this is a reasonable thing to ask here. I haven't "tried" anything because I'm not really having a problem. I'm just looking for guidance before I start.
I am cobbling together a device that will need 5, 3.3, 2.5 and 1.8 Volt power sources. The heart of this thing is going to be a Raspberry Pi Compute Module.
In the documentation for the Pi Compute, they give a fairly strong warning that the power supplies must come up (in time) from highest voltage to lowest to avoid forward-biasing internal diodes between sources to avoid latch-up.
I am planning to use devices like the LM2576 because they seem simple enough to use and have lots of online examples and application notes.
I have two multi-part questions...
First, is it reasonable to simply build discrete power supplies for each required voltage and cascade them? (12V input -> 5V -> 3.3 -> 2.5 -> 1.8). Or is there a better practice to follow when you need multiple voltages?
Second, does merely cascading the supplies ensure that they come up in order? Or is there something I should do (perhaps with larger in-parallel capacitors between them?) to create a short delay between power-ups?