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TPS65320D-Q1: Supplementing LDO current when NOT in Standby

Simon Wood
Prodigy 10 points
Part Number: TPS65320D-Q1

Hi,

I am looking at the TPS65320D-Q1 for a new (USB-C/battery powered) design. The LDO has 280mA capability which sufficient for "DDR Core" in standby, but not during normal/full operation.

Is it possible to supplement the "DDR Core" rail with another (in parallel) regulator when in the operational mode, which would then be turned off during standby?\

Say something like:

Regulator in Parallel

  • 0
    TI__Intellectual 1921 points

    Howdy Simon.

    Sorry for the delay. I'll send a response by tomorrow.

    Best,

    - David Martinez

  • 0 in reply to David Martinez
    TI__Intellectual 1921 points

    Howdy Simon.

    What is your requirement for the standby quiescent current?

    Your idea is most likely not plausible.

    1) You need to be cautious of the standby-to-active transition. If the external LDO is not driven fully by the time the system is in active mode, this can lead to the TPS65320D-Q1 LDO rail being overloaded. 

    2) The diodes will drop the external LDO output a bit, which will not be good if the DDR core rail requires a certain voltage tolerance.

    Suggestions:

    1) Power the DDR core rail at all times with a buck converter. This will fulfil the timing and load requirements.

    2) Power Muxing is also an option (Use the TPS65320D-Q1 in standby mode, and switch to the external LDO in active mode). Nonetheless, this will require more parts than you already have.

    I will follow up Monday with finding if there is another alternative to the TPS65320D-Q1 that would be fitting for you.

    Thanks,

    David Martinez