I want a circuit that input 0.7v and outputs 1.2v 1.8v 3.3v and 5v.

No need for information, just make up a bunch of stuff.

You are asking for a four-output boost converter. That is a significant design task, and a lot to ask for for free. What have you done so far? P;ease post your schematic / block diagram / whatever.

What is this for? What is the load current for each of the four outputs? How much current is available from the 0.7 V power source?

ak

Hello sir, I am a student. I'd like to request suggestions for the structure of this circuit.

We await your answers to the questions in post #2.
Also, what is the 0.7V source, and is any other power source available?