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TPS63070: overcurrent limit behavior and how to calculate

Shinya Sawamoto
Expert 5285 points
Part Number: TPS63070

Hello team,

I have a couple of questions about the overcurrent limit behavior of TPS63070.

Q1) How the overcurrent limit works, hic-up or current limitation with output voltage dragging down?

Q2) Does the IIN,max of 3600mA mean the peak current of the inductor current?

Q3) I guess that the maximum load current value of Iout in the Figure-18 can be calculated with the equation (8) with corresponding IIN,max to Ipeak, is it correct?

My client considers how to maximize the output current in boost mode. (Vin=4V, Vout=6V, Iout=2A_want)
That is why I need to understand it correctly.

Thanks in advance.
Shinya Sawamoto

  • 0
    TI__Guru 65280 points
    Hello Shinya,

    TPS63070 limits the average input current, not the peak current.
    The peak current will vary with the value of the used inductor. The bigger the inductor, the smaller the peak current.

    Please use formulas 2 to 5 in the datasheet for calculating the output current based on the given input current.

    As the average inductor current is limited, the inductor value has limited to no influence of the maximum output current.
    Which current is needed at which voltage?

    Best regards,
    Brigitte
  • 0 in reply to Brigitte
    TI__Expert 5285 points
    Hello Brigitte,
    Thank you so much for your prompt feedback.
    I understood the current limit value stands for the average current, not the peak current.
    Now I can get how to be calculated Figure-18.
    The required capability is 2A output at 4Vin/6Vout boost mode, but it seems very close to the border.

    Regards,
    Shinya Sawamoto