I am designing a custom PCB and want to power 2 rails: a 3.3V and 5V rail, with a single 250mAh LiPo battery (3.7V) and need the 5V rail to have as stable a voltage as possible.
I understand that a buck-boost converter with the right voltage bias ratings could theoretically power both these rails in isolation, though for this application I am questioning using a single buck-boost to power both the rails simultaneously as I am trying to reduce space on my PCB and improve efficiency. I am fairly new to using DC converters and thus I don't know if it is common practice to do this, and if it is, where to begin with searching for the right buck-boost for this application (bearing in mind I have to make sure the output voltages have as low ripple as possible and the voltage levels don't deviate significantly from the intended level). I need to be able source ~12mA on the 5V line and ~152mA on the 3.3V line.
I have searched for some buck-boost converters and found some I think would work (such as this one) but just want confirmation if it is advised to use them in this way. Alternatively, would it be advised to use a separate voltage regulator and boost converter to achieve this? Thank you!