In a project, I use the MCP73831 battery charge management controller. You can see the schematics below.
Problem is, if I use it as it is, I have a voltage drop-out on a 1n5819 diode and this regulator lose some noise. If I remove it and bypass it, it works. Sort of. There is no noise. But that LED is not turn on as bright as it should. Can't say if it charges the battery at all.
If I connect it with the 12V/3A power supply, my LiPo battery is charging. When charged, LED will turn off. If I remove this 12V powering it, my setup will work.
But, if I just plug my battery, without 12V powering it, That LED U22 on LM2596 will turn on and I get a magic smoke from MCP73831. Something is wrong, and I can not see what.
I have read this article, but not sure what I did wrong.
MCP7383/SE5218 part I use in a bunch of my projects and it works fine with LiPo batteries. Although, it is powered with a USB power adapter. Or PC USB. And it works fine. Not a single issue.
LM2596 I use in a bunch of projects when I need a 12V power supply.
This is the first time I use them combined. I have a drop-out on 1N5819, but I must have some protection there. Yes, I looked at the datasheet for everything here for days. I haven't seen anything that could help me solve this out. Only that cap C14, that should be 4.7uF. If that makes the problem, I will eat the whole reel.
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Where I get this schematic? Not sure I understand. This as it is, I made. I didn't invent hot water. Maybe out there someone else made the same. Who knows... It is not important.
However, I said I am talking of 1N5819, which is D12. That line goes directly to an MCP73831. Stat LED is the one that shows is it charging or not, it is LED5. 12V comes from a 12V/5A power supply. Huge one. The battery voltage of LiPo is 3.7V. It is charging with 4.2V.
Sorry if I was not clear enough. Thank you for your effort. If any info needed, please tell me.
