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BQ25628: When the battery is removed, the system can also operation

Part Number: BQ25628

When the battery is removed, the system can also operation;

In this application, NTC has been removed. Do RT1 and RT2 still need to be retained?

When the system is not turned on and default parameters are used, if a charger is needed to provide maximum power to the system, what range should the voltage of the TS pin be maintained within?

Is the current capacity of the VBUS supply system limited only by ILIM pin and IINDPM register bits? Will temperature(TS pin) affect the functionality of VBUS to VSYS?
What should be the normal voltage value of TS_BIAS?

  • Hi,

    It's better to disable charge if no battery.

    TS pin should only impact on charging behavior.

    The TS_BIAS pin is internally connected to the REGN LDO via a back-to-back MOSFET switch.

    Thanks,

    Ning.

  • When the system is not turned on and default parameters are used, if a charger is needed to provide maximum power to the system,Is the current capacity of the VBUS supply system limited only by ILIM pin and IINDPM register bits?

    About CE pin;  

    Battery charging is enabled when EN_CHG bit is 1 and CE pin is LOW. CE pin must be pulled HIGH or LOW, do not leave floating.

    In this description,If you want to turn on the charging function, two necessary conditions are required:“EN_CHG bit is 1 and CE pin is LOW”;

    So if you want to turn off charging, do you need to turn them off at the same time?Or close any one of them?

  • Hi,

    1. When valid VBUS is present, the device will switch to support VSYS normally even if charge is disabled. If VSYS is off, the device needs to enter HIZ mode, then VBUS will not support any power into SYS.
    2. Either /CE high or EN_CHG=0 will disable charge.

    Thanks,

    Ning.