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Original question:

BQ24616: About IINDPM

BQ24616: About circuit configuration without BAT FET

Tsukui Yusuke
Guru 21930 points
Part Number: BQ24616
Other Parts Discussed in Thread: BQ24172, BQ24610

Hi,

Could you give me some advice on circuits that do not use power path?
I would like to change the circuit configuration to solve the following E2E post problems.
https://e2e.ti.com/support/power-management/f/196/t/922736?tisearch=e2e-quicksearch&keymatch=bq24616

１．Can the bq24616 realize the following circuit configurations?

        

２．For the above circuit, What is the relationship between charging voltage and battery voltage when there is a sudden discharge during charging operation?
       Could you give me your explanation and advice about the expected behavior?
　　Customer wants to know the operation details when there is a sudden discharge during charging.

３．With this circuit configuration, Could you tell me how to secure Vcc of bq24616 when the adapter is removed.
       Please advise about the expected operation when operating with only the battery.


Regards,
Yusuke

  • 0
    TI__Mastermind 24075 points

    Hi Yusuke,

    This is similar to the question you asked before. I have sent a friendship request so you can send me the waveform directly.

  • 0 in reply to Kedar Manishankar
    Guru 21930 points

    Hi Kedar,

    Thank you for your support.
    I sent the waveform of the previous circuit configuration pattern.

    However, considering E2E support,
    We are proposing a new circuit configuration.
    https://e2e.ti.com/support/power-management/f/196/t/922736?tisearch=e2e-quicksearch&keymatch=bq24616

    Could you give your opinion on the first question you posted?

    Regards,
    Yusuke


  • 0 in reply to Tsukui Yusuke
    TI__Genius 10385 points

    Yusuke-san,

    Should be able to configure BQ24616 in the same way that BQ24172 is configured to disable DPM and PPM.

    I hope this resolves your issue,

    Ricardo

  • 0 in reply to Ricardo
    Guru 21930 points

    Hello Ricardo-san,

    Thank you for your support.
    I want your explanation for the other questions.
    Could you give me your advice?

    2．
    For the above circuit, What is the relationship between charging voltage and battery voltage when there is a sudden discharge during charging operation?Could you give me your explanation and advice about the expected behavior?
    Customer wants to know the operation details when there is a sudden discharge during charging.
    I would like to know the following graph image of this circuit version.
    If Vsys and Vbat have the same voltage, I would like to know what kind of operation occurs when a sudden discharge occurs.



    ３．
    With this circuit configuration, Could you tell me how to secure Vcc of bq24616 when the adapter is removed.
    Please advise about the expected operation when operating with only the 1cell Li-ion battery.
    Is it correct to understand that the BQ24616 is in the OFF state when using only batteries?

    Best regards,
    Yusuke

  • 0 in reply to Tsukui Yusuke
    TI__Genius 10385 points

    Yusuke-san,

    2. 

    As you are not making use of PPM that figure does not apply to your circuit. During a sudden discharge the current would directly from the battery to the system. Please also note that the charger will not supply more current than it is set to as you have broken the direct connection to the adapter.

    In summary in the "no PPM" configuration VSYS always equals VBAT. 

    3.

    Please take a look at the schematic checklist in the post below to see how to connect VCC

    https://e2e.ti.com/support/power-management/f/196/t/791790

    I hope this resolves your issue,

    Ricardo

  • 0 in reply to Ricardo
    Guru 21930 points

    Hello Ricardo-san,

    Thank you for your response.

    >In summary in the "no PPM" configuration VSYS always equals VBAT. 
    I understood that thanks to your kind explanation.

    >Please take a look at the schematic checklist in the post below to see how to connect VCC.
    I confirmed your material that introduced me.
    "Bq24610 simplified Non PowerPath" is a circuit close to my assumption.

    May I ask one more question?
    Could you check the PDF below?

    I understand that the bq2461x has the specifications to secure the VCC voltage from the battery when the AC adapter is removed.
    However, For 1-cell Li-ion battery, it corresponds to UVLO of VCC.

    When operating with only a 1-cell battery,
    Is it correct to understand that device is in the OFF state?
    Or is this device boosting the battery voltage and using it as the internal power supply for the device?


    bq24610 simplified Non PowerPathpptx.pdf

    Best regards,
    Yusuke

  • 0 in reply to Tsukui Yusuke
    TI__Genius 10385 points

    Yusuke-san,

    Your understanding is correct. The device is not boosting the battery voltage and if the battery falls below V_UVLO, then device will be in the OFF state. 

    I hope this resolves your issue,

    Ricardo