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TPS63060: TPS63060 Switch Off Issue

Ameya Mahajan
Prodigy 110 points
Part Number: TPS63060

Hello,

We have used TPS63060 Buck Boost in our designs. Please refer the below attached picture of the Buck Boost and LDO section of the design.

We are using switch for the Enable Pin To Enable/Disable the Buck Boost Convertor.

The issue is that even when the button is not pressed (enable is getting ZERO vtg) the buck boost convertor gives vtg of 0.661 V and the ULDO gives 1.064 V. (Vbat is 6V)


This voltage is not ideal as this causes current consumption as checked of 520 uA. This leads to low battery life.

Ideally when the enable is Low the o/p voltage should be 0V.

What can be done.

Thanks,

Ameya

  • 0
    TI__Guru 65170 points

    Hello Ameya,

    As the output voltage of the LDO is higher than the voltage on the Buck-Boost output, I expect that this voltage is coming from the system side behind the LDO and not from the buck-boost converter. The 0.4V difference point to the backgate diode of the pass element of the LDO. Please check the power consumption of the system when the LDO is removed.

    Please check which other leakage paths might be available parallel to the buck-boost and LDO into the system.

  • 0 in reply to Brigitte
    TI__Guru 65170 points
    Hello Ameya,

    I did not hear back from you, so I expect you have been able to solve the issue.
    Please add another post to this thread or (in case this thread is locked) start a new thread if the problem still exists.