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LM5008A: Always voltage on the output (0,6V)

Paul Klarhoefer1
Intellectual 365 points
Part Number: LM5008A

Hi,

I'm using the LM5008AMM in a battery. It provides 3.3V for MCU. When turned on, everything is working correctly. 3.3V are provided.

My problem is: When turning it off, there is always 0.65V on the output. And therefore we have a very high self discharge rate in the battery.

Do you have an idea, what I could change in schematic to complete shutoff the DC/DC?

The DC/DC Enable signal is 0V, when it should be off.

  • 0
    TI__Genius 10655 points

    Hello,

    What is the voltage measured at the Vcc pin when the part is shutdown? I want to make sure that the part is actually off.

    What is driving the DC/DC Enable signal? Is this DC/DC Enable driver referenced to the same GND as the LM5008A?

    Do you have any oscilloscope images of the SW node voltage and output voltage when DCDC Enable is 0V? What about when the part is working properly? I wonder if the part is still switching for some reason.

    Also out of curiosity, what is the value of L600? What happens if your short this device?

    Regards,

    Harrison Overturf