Splitting the voltage from a lipo battery to 5 outputs
This idea is not the original one. In fact, ALL power in notebooks is derived that way, sometimes using a single IC called PMIC, Power Management IC. A typical PMIC also provides a lot other services as PowerGood, all necessary sequencing of power rails, on power on and power down, the necessary suspend sequencing, etc. etc. Some power rails are made as buck converters, some are LDO. The number of rails also varies, 5, 10, 15, whatever is needed for a portable SoC or else. Here is an example: NXP PF3001.