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TPS63900: TPS63900 cannot be dialed under light load.

anson zhou
Prodigy 130 points
Part Number: TPS63900

Tool/software:

Now we have encountered a situation where the chip output cannot be turned off under light load. In the figure, input POWER: 3.0V and output VCC_m: 3.3V
We found the following phenomenon when using TPS63900:
When a load of only a few μ A is connected to VCP_M, even if VCP_CTL2 is set low, there is still a voltage of about 2.6V on VCP_M, and the current at the POWER input terminal will increase by about 10uA. (If VCP_M is turned off at this time, the chip output can be turned off)
Please help analyze where the problem is

  • 0
    TI__Mastermind 27480 points

    Hi anson,

    VCP_M in your description is actually VCC_M?

    When this a uA current applied at output side, it will charge the output cap and Vout will increase, finnaly, when the leakage current is same with current applied, Vout will keep stable in some level, 2.6V in your case.

    No idea why the input current increase when Vout is 2.6V. is it possible a measure mistake?

    Regards

    Tao