Embarking on some work with the Raspberry Pi recently, I wanted to know what its power architecture looked like. The schematic diagrams are freely available but a quick web search didn’t reveal any higher-level design documents like this, so I drew my own and here it is.
I offer no guarantees of accuracy. Don’t blame me if you use this documentation and destroy your Raspberry Pi or anything else. This is not an official document. I hope it’s useful to someone.
The original version of this that I posted in April 2013 had a mistake in it, which Kai kindly pointed out. The version below has been corrected.
There’s a nice shiny pdf of it here: Raspberry Pi Power Architecture
martinjonestechnology 
Thanks for this diagram, it is very informative and has a clear layout! It is very useful!
However, could it be possible that the input of RG1 is connected to to the output of RG2?
You’re right! I’ve just checked the schematic and RG1 is indeed connected to RG2. My diagram has a mistake in it – I’ll have to correct it. Thank you for pointing it out.