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BQ25606: Battery cannot be charged.

John Yang2
Prodigy 30 points
Part Number: BQ25606

Without Battery connection, The SW pin output 2.2V mean only. Sys pin output 2.2V.

  • 0
    TI__Guru 52441 points

    Hi,

    Is any SYS load connected before applying VBUS voltage?

    Thanks

    Ning.

  • 0 in reply to Ning T
    Prodigy 30 points

    Yes, it has load as below:

     

     

     

    Do I need a bigger inductor for the battery charger, the current one is 1uH only?

     

    When I power it up without battery, I could see under OSC that the sys pin is switching but could not ramp up.

    If I connect a battery, (Liion, 18650, 3500mAh, 3.7V, 12.95Wh, Protected Li-ion Rechargeable Battery, Part# 1s1pmj1), the sys pin can ramp up to 4.2V and start charging the battery.

     

    I have verify that the two resistor connect to  TS (pin 11) are soldered good.  The input current set to 2.5A and the charge current set to 1A by resistors. What else I have missed?

     

    I can see the charger should work without battery from the 1st page of your data sheet. Have I done something wrong?

    By the way, I have the power sequence to turn ON  the 5V / 3.3V DC converter, the Enables of 5V / 3.3V DC converter has delay right after the sys pin of charger has output.  Is it an issue?  

     

    Thank you for your support.

    John

  • 0 in reply to John Yang2
    TI__Guru 52441 points

    John,

    Referring to page 10 of the d/s, the IINDPM is set to 200mA initially when SYS starts up.

    If the charger is powered up without the battery, VSYS will start from 0V and may stuck in 200mA IINDPM if SYS tries to pull too much current during start-up.

    Thanks,

    Ning.

  • 0 in reply to Ning T
    Prodigy 30 points

    I could see the data sheet showed that BQ25606 works without battery. May I add a NTC to the load to limit the current during start-up? What's the recommended value? The data sheet doesn't mention about this. please advise. Thank you. 

  • 0 in reply to John Yang2
    TI__Guru 52441 points

    John,

    Could you enable the SYS load after VSYS is powered up? Some loads have Enable pin or UVLO function.

    Thanks,

    Ning.