This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

BQ25570: BQ25570 charge 3V Battery

Part Number: BQ25570

Dear Sir/Ms.

This is an extension of the article.

My customer got BQ25570EVM.
His input source is this solar panel. His battery is a 3 volt rechargeable battery. I asked the customer to send me the battery specification, which is really 3V.

Since I have not touched this aspect of the charging IC, can you guide us how to set the BQ25570EVM. Jumpers setting, resistor setting, etc...

Best Regards,

kami Huang

  • Hi Kami,

    EVM resistors R1 and R2 need to be changed to set VBAT_OV to 3.0V.  You can use the spreadsheet at to help with that. Jumper J1 needs to be removed and jumper J4 needs to connected to 80% to set MPPT to 80% of the panels open circuit voltage. If the buck converter is not needed then I recommend tying VOUT_EN to GND using JP3.  

    This is a boost only converter so the solar panel VOC*80% must be < 3.0V.