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BQ25170: USB-C PD using BQ25170 + TPS63070

SK
Intellectual 300 points
Part Number: BQ25170
Other Parts Discussed in Thread: TPS63070, , BQ24170, BQ25798

Tool/software:

Hi teams,

I have a portable application that is evaluating the TI's solutions.

I draw a simple block diagram as below, could you please suggest the diagram are feasible?

The requirement:

1) discharging to the loads from battery by TPS630702.

2) charging the battery through an USB-C PD adapter, and powering the loads by TPS63070 & TPS630702 at the same time. Cut the power path from battery to the loads.

Thanks so much.

SK.

  • 0
    TI__Guru** 105640 points

    Hello SK,

    I believe you meant to link the BQ24170 instead of the BQ25170 on this thread. I will assign someone to look at this who is more knowledgeable on the BQ24170.

    Sincerely,

    Wyatt Keller

  • 0 in reply to Wyatt Keller
    TI__Guru**** 166146 points

    Hi SK,

    At a high level, the block diagram looks okay.  However, it is my understanding that USB-C SPR max output current is 3A not 4A, allowing only 5V*3A=15W input power to the charger and system.  Even with 4A, any current that passes directly to the TPS6xxx devices is not available to charge the battery.  So, you can set the BQ24170 charge current to 4A but it will need 4.2*4A/5V = 3.4A to charge the batteries at 4A, leaving on 0.6A*5V=3W for the system.  Maybe change to an NVDC charger like BQ25798 and increase the USB-C output voltage to 9V?  BQ25798 maintains it SYS output voltage to the higher of MINSYS (set lower than VREG) or VREG.

    Regards,

    Jeff

  • 0 in reply to Wyatt Keller
    Intellectual 300 points

    Hello Wyatt,

    Yes. That is BQ24170 but BQ25170, it was typo.

    Thanks for your response.

    Looking forward to any suggestion.

    SK.

  • 0 in reply to Jeff F
    Intellectual 300 points

    Hello Jeff,

    Thanks for your response.

    I got your opinion about SPR standard.

    How if I change the settings of the front USB-C controller to 9V/3A?

    It will be sinking 27W max power to the BQ24170 and to the system.

    Sincerely,

    SK.