USB Battery Charger and 3.3 V Supply

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#1 21671608 31 May 2014 02:18

Jose Antonio Carrasco Jose Antonio Carrasco

Anonymous

Post #1
21671608 31 May 2014 02:18

Hi,

I would like to ask you for advise and correction in case it is wrong. I wanted to change this power supply by usb which is working rightly in my device http://i.imgur.com/wRttv6c.png to one using lion/lipo batteries.

So I did this schematic http://i.imgur.com/aBNC1c0.png using http://www.micrel.com/_PDF/mic5305.pdf and http://datasheet.octopart.com/MCP73832T-2ACI-OT-Microchip-datasheet-16123459.pdf

What do you think about it? Will it protect enough my batteries? Do you see any mistake or something could be improved?

Thank you!
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#2 21671609 02 Jun 2014 04:06

Jose Antonio Carrasco Jose Antonio Carrasco

Anonymous

Post #2
21671609 02 Jun 2014 04:06

Thank you Colin, but i need the design to integrate it in a PCB.

Hi again,

I changed my schematic again to this one
http://i.imgur.com/kOZ8WoK.png

This schematic is divided in 2 parts. From LiPo to right is based in my current schema powered only by USB 5V. And LiPo to left is what i added based on this design
https://www.sparkfun.com/datasheets/Prototyping/Batteries/LiPo-Charger-Basic-v10.pdf

So, having this all together, do you think is there any error? Should I put any component between these two schematics? I am specially worried about when the battery is full.

Thank you
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USB Battery Charger and 3.3 V Supply

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