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BQ24725: the chip does not work

Kevin Xiong
Expert 2340 points
Part Number: BQ24725

Hi,

I use BQ24725 to charge my battery. But the battery voltage can NOT be charged and it always keeps as 9.2V. My input voltage is 12.5V.

Could you please help review my schematic as attachment? The other picture is battery voltage waveform.

Thanks.

Kevin Xiong

  • 0
    TI__Genius 10240 points
    Kevin,

    BQ24725A is a host controlled charger. Was the charge enabled conditions ok (datasheet section 8.4.5)? Was the Charge Current and Charge Voltage written to the registers (datasheet section 8.5.3 and 8.5.4)? Why does the abttery have ~3V pulsing? It seems not right. Do you have the PHASE node waveform?
  • 0
    TI__Genius 11850 points
    Hi Kevin,

    In addition to Eric's comments, please take a look at Star's thread, in which I provided some comments on your schematic:
    e2e.ti.com/.../806980

    If possible, let's keep the discussion contained to one thread to make things more organized.

    Best regards,
    Angelo