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BQ24192: High quiscent current when VBUS=0 and BAT is available

Alexandru Mixich
Intellectual 495 points
Part Number: BQ24192
Other Parts Discussed in Thread: BQ25731, , TPS61230, BQSTUDIO

Hi,

we use in our project the bq24192 as a charger together with bq25731 as a gasgauge.

Almost everything working fine but i'm just wonder that when VBUS=0 and the system load is very low (Iload<1mA), the quiscent current of the bq24192 shows peaks for short time in the range of 30-35mA. The pin /CE is held all the time on LOW.

Has somebody an idea why this happen?

Thanks in advance for your help.

Regards,

Alex

  • 0
    TI__Mastermind 18375 points

    Hi Alex,

    To confirm you are identifying 30-35 mA of current pulsing from the Battery into the charger while VBUS = 0V and /CE is low?

    Can you please share the relevant schematic and characterization information (frequency if constant, pulse duration, waveform) describing the pulsing?

    Best Regards,

    Juan Ospina

  • 0 in reply to Juan Ospina
    Intellectual 495 points

    Hi Juan,

    in the meantime i found the reason of the behaviour.

    The cause for the battery current peaks is not the charger component bq24192 itself, it is the step-up converter  TPS61230, connected at the output of the charger, which has a very light load (Iload < 1mA).

    Attached you can see the schematic and the current peaks measured through a I/U converter.

    The peaks are lying around 45 mA.

    But something else. 

    I need to reconfigure the value of the charging voltage in bq24192.

    As it can be seen in the schematic we use the bq24192 together with bq27531. After reset, the bq27531 control the bq24192. Through bqStudio i can not change the value. 

    Do you know how to do this? Should i post this in a new topic?

    Regards,

    Alex

  • 0 in reply to Alexandru Mixich
    TI__Mastermind 18375 points

    Hi Alex,

    I'm glad you were able to figure out the cause.

    In order to change the charging voltage you will have to modify the value of register REG04. If you are doing this through the gas gauge (assuming from your schematic) then I would tap into TP1204 and TP1205 to verify that the I2C transaction is going through as intended. 

    I would recommend opening a new thread with the BQ25731 to check why it might not be communicating as intended with the charger.

    Best Regards,

    Juan Ospina