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BQ25622:Seeking assistance to increase CC charging current for BQ25622

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Prodigy 20 points
Part Number: BQ25622

Tool/software:

I am writing to seek your assistance in resolving an issue with the BQ25622 battery charger IC. I am attempting to charge a single-cell Li-Ion battery using this IC, but the CC charging current is significantly lower than expected, resulting in prolonged charging times.

The desired charging current is at least VBAT=2.5A, but the current appears to be limited to around 1.0A. I have verified that the input power supply can provide up to 5V/3A.

Furthermore, the charging status transitions frequently between CC and CV, and the conditions governing these transitions are unclear.

I have disabled the temperature-based limiting function, so I assume it is not the cause of the current limitation.

I would greatly appreciate your guidance on how to increase the CC charging current for the BQ25622 IC. Any configuration settings, techniques, or expertise you can share would be immensely valuable.

Thank you for considering my request. I look forward to your prompt response.

  • 0
    TI__Guru 57861 points

    Hi,

    Could you please provide the following when the actual charge current is lower than the desired value?

    1. The charger operating conditions such as VBUS (voltage at VBUS pin), IVBUS, VBAT (voltage at BAT pin), IBAT, VSYS, ISYS.
    2. All the register readings. The register readings help to understand the charge operating status and fault conditions if any.

    Thanks,

    Ning.

  • 0
    Prodigy 100 points

    What is your ILIM resistor value? The lower of IINDPM and EXT ILIM is taken into consideration. You might need to disable the EXT ILIM in REG0x19_Charger_Control_4 Register Bit 2 EN_12V_or_EN_EX
    TILIM, also you need to reset the watchdog, or keep updating it on watchdog expire, as it is WATCHDOG reset.

  • 0 in reply to Nandor Janky
    TI__Guru 57861 points

    Hi,

    For debugging, it is better to disable the watchdog timer and disable the ILIM pin function by resetting EN_EXTILIM bit to 0.

    Thanks,

    Ning.