Help with 3.7V LiPo Charging & 5V 2A Boost Circuit (KiCad ERC Issues)

Schematic
1

Hi everyone,

I’m working on a circuit to charge a 3.7V LiPo battery and boost it to 5V with a 2A output. My design is based on this SparkFun module, but I want to modify it to:

  • Use USB Type-C input
  • Provide a 2A output
  • Charge multiple LiPo batteries in parallel - cant provide link because of new users limitation

Issues & Questions:

  1. How can I modify the circuit to provide 2A output?
  • I read that changing a certain resistor could help regulate the current—does anyone know which one?
  1. KiCad ERC Errors:
  • I get errors related to bidirectional and power output pins, as well as an “Input Power pin not driven by any Output Power pins” issue.
  • Where should I place power flags to resolve these issues?

Here are my KiCad schematic and ERC errors:
(Screenshots attached)

Any advice would be greatly appreciated!
First Design Ever :slight_smile:
https://imgur.com/a/kicad-question-pictures-f266tpe

2

These types of questions we generally encourage you to use another forum for. If some use wants to add a quick comment, that’s fine but we don’t normally let it go on too long. Off topic. This site is about using Kicad.

I’m pretty sure these are in the FAQ link at the top.

3

You can’t get more than 500mA out of the charging IC MCP73831. Check out the data sheet (search for it on your favourite search engine).

4

Just a comment on ERC. Passing it doesn’t mean your circuit is correct and will work. The circuit design could be horribly wrong and still pass ERC. It’s there to catch mistakes that are probably errors. Design is much more than being able to draw a schematic and pass ERC.

5

Enough replies. This is not a KiCad issue

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