Guest Kaxsp Posted May 30, 2014 Report Share Posted May 30, 2014 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 schematicusinghttp://www.micrel.com/_PDF/mic5305.pdf andhttp://datasheet.octopart.com/MCP73832T-2ACI-OT-Microchip-datasheet-16123459.pdfWhat do you think about it? Will it protect enough my batteries? Do you see any mistake or something could be improved?Thank you! Quote Link to comment Share on other sites More sharing options...
audioguru Posted May 30, 2014 Report Share Posted May 30, 2014 Why is your schematic an awful looking negative image?? admin: please be politeThe 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. Quote Link to comment Share on other sites More sharing options...
Guest Kaxsp Posted June 1, 2014 Report Share Posted June 1, 2014 Well, sorry for the negative image, it is just a printscreen of my current design.I changed my schematic again to this oneThis 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 designhttps://www.sparkfun.com/datasheets/Prototyping/Batteries/LiPo-Charger-Basic-v10.pdfSo, 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 Quote Link to comment Share on other sites More sharing options...
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