Portable Headphone Amp Power Supply 18V Design

[MladenGavric]

Hey everyone!

Disclaimer: I'm new to EEVblog, diyaudio, amplifiers, power supplies, schematics, PCB design and everything that this forum touches on (read: NOOB), so I urge you to be patient with me - I am eager to learn though.

That being said - Hi! My name is Mladen

Anyway, on to the point: Recently I came across @xrk971 thread Hakuin SE Class A HP Amp which got me interested into building my own amp (PCB design and everything).
But, since X hasn't opened source his power supply schematic I decided to tackle that on my own (without some extras he implemented). Basically what I tried to do is Power Supply portion of the amp: Battery Charger --> Boost Converter --> LDO.

Spent last few days reading through data sheets, reference designs, TI's design tools (WEBENCH Power Designer) and this is what I came up with. I would greatly appreciate if you could fact check the schematic and suggest things I should do (things that I've probably missed). What I'm mostly unsure about is Battery Charger schematic and USB-C connection.

I plan to use Samsung's EB-BJ710CBE battery (if possible), or something else if you recommend it.

Data Sheets:

MCP73871, TPS61178, TPS7A470