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BQ24170 pin PVCC

Jose Antonio Moya Espinosa
Prodigy 50 points
Other Parts Discussed in Thread: BQ24170

Hello.


I´m a design a charger with BQ24170, but i don´t found information about the pin PVCC. Can i help me to find information on this pin and know that it serves?


Thank you

  • 0
    TI__Genius 13700 points

    Hello Jose,

    An initial pin description of PVCC is available in the table on Pg. 2 of the datasheet where it explains this pin is the power input to switching converter of the charger. The AVCC powers the many of the internal components and the references while the power used to charge the battery is pulled from PVCC.

    The figure below shows a portion of the internals of the BQ24170 and it shows the PVCC pins are connected to the high-side FET of the internal buck converter used for charging.

  • 0 in reply to Ryan May
    Prodigy 50 points

    Dear Ryan.


    Thank you for your answer. I have read the description about this pin in the datasheet, but it not solve my doubt. But what is it the utility?? Why is in the some squematic is conect to a conector?? Only it serve the measure of PVCC??

    I have some squematic and it this name net is  "SYSTEM". I´m confused.


    Best Regards

  • 0 in reply to Jose Antonio Moya Espinosa
    TI__Genius 13700 points

    Hello Jose,

    The PVCC pin is the power input for the buck converter used to charge the battery.

    The reason why there is a AVCC and a PVCC is that the switching from the buck converter on PVCC introduces noise that would reduce the accuracy of the analog comparisons that occur within the device. By splitting up the rails like this the best operation is achieved.

    The reason why the PVCC rail is sometimes labeled "SYSTEM" on Pg. 4 & 5 is that the input voltage from the adapter is used as the input to the battery charging buck converter and to a rail in the system. The figure on Pg. 6 shows the system powered from the battery rail instead of from the adapter.

  • 0 in reply to Ryan May
    Prodigy 50 points

    Dear Ryan.


    Thank you. Your answer has resolve me my doubt.


    Bye