I have 3 circuits
Circuit 1 8V 400mA
Circuit 2 5V 700mA
Circuit 3 3.3V 40mA
Battery 4.2V lipo 3000mAh
Option 1 – 4.2v to 8V booster 1.2A and 5v regulator, 3.3v regulator
Option 2 – 4.2v to 5V booster 750mA,3.3 regulator and 4.2v to 8v booster 400mA
Circuit 3 is always operating
Circuit 1 and 2 do not operate continuously