Micro USB battery charger and 3.3V supply

[Kaxsp]

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

to one using lion/lipo batteries.

So I did this schematic

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!

 

[audioguru2]

Why is your schematic an awful looking negative image?? admin: please be polite

The 3.3V regulator will stop working long before the battery voltage drops to 3.2V.

What will prevent the battery voltage from being discharged too low? You need a protection circuit that disconnects the load on the battery when its voltage drops below 3.2V.

 

[Kaxsp]

Well, sorry for the negative image, it is just a printscreen of my current design.

I changed my schematic again to this one

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 and the voltage drops..

Thank you