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TPS65988: Supply if not short

DDdoor
Expert 2435 points
Part Number: TPS65988


Hello,

Customers are considering TPS65988.

The system needs 1.5A.

If the supply source can not meet the 1.5A requirement,

can it be set to supply no current?

Best regards,

DDdoor

  • 0
    TI__Mastermind 30000 points

    Hello,

    Would you be able to elaborate on your system setup? Is your TPS65988 configured as the Sink or Source? Are you wanting the TPS65988 not supply current based on the 1.5A requirement or have the device being connected to the TPS65988 not supply current unless it can supply 1.5A?

  • 0 in reply to Adam Mc Gaffin
    Expert 2435 points

    Hello

    Thank you for your reply.

    ・Would you be able to elaborate on your system setup?
    The customer wants to supply power from the USB to the later CPU etc. Battery is not installed. They are thinking of supplying via AC adapter or USB.

    Connection is considered as follows.
    USB -> TPS65988 -> DC/DC(3.3V) -> CPU

    ・Is your TPS65988 configured as the Sink or Source?
    It is a sink.

    ・Are you wanting the TPS65988 not supply current based on the 1.5A requirement or have the device being connected to the TPS65988 　not supply current unless it can supply 1.5A?

    It becomes the latter.The costomer is wanting have the device(source) being connected to the TPS65988 　not supply current unless it can supply 1.5A

    Best regards,
    DDdoor

  • 0 in reply to DDdoor
    TI__Mastermind 30000 points

    Hello,

    Apologize for the late reply.

    The USB port could power the system without receiving any power from the system it is connected to. We call this a dead battery condition, and is explained within section 8.3.5 of the datasheet.

    As far as not advertising 1.5A unless it can support it, if the TPS65988 is in a dead battery condition, then it will not advertise at all as a source but only a sink.