I have a circuit the needs the following voltages; 5v, -2.5v, 16v and -16v. Currently I am powering this circuit from a bodged mix of batteries and various voltage regulators however if possible I'd like to supply this all from one power supply. My plan is to use two boost converter chips to generate my +/-16v both from probably 9v batteries and to use regulators to help make the 5 and -2.5 voltages but I'd like to ask a few questions first.
1) Can I use a normal boost converter ic such as tps61040 to generate both positive and negative voltages or do I need a special inverting boost converter for negative voltage?
2) Can I tap off of the +/-16v with regulators to generate my +5v/-2.5v? I imagine that this would be quite inefficient and probably cause the regulators to give off a lot of heat; is there some sort of switch mode ic I could use before the regulator to make things more efficient?
3) Can I power both the positive and negative voltages from the same source somehow?
Any help with the above or suggestions for better ways of doing things much appreciated.