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DRV8353M: Running VDRAIN < 7V

Antenna_Head
Genius 11715 points
Part Number: DRV8353M

The minimum spec for VDRAIN is 7V.  

Customer would like to go lower, but there is a UVLO in place for various reasons.

Would a work-around such as this be OK?

Thanks, Best, -Steve

  • +1
    TI__Mastermind 18916 points

    Hi Steve, 

    Josh is OOO, returning Thursday - so let me give you some insight into this in advance. 

    If the customer wants to try implementing a diode to keep the voltage above 8V then this proposed circuit implementation should work out fine.

    They might have to take some additional care in selecting a high-speed diode (maybe a Schottky) and also checking the reverse conduction voltage so that it doesn't cause current conduction or excessive leakage when VDRAIN is biased much higher than 8V normally. 

    One other thing I may propose is that they just have a Schottky diode connected from VM to VDRAIN, assuming that the VM is continuing to be powered on while VDRAIN declines significantly. 

    Best Regards, 
    Andrew 

  • 0
    TI__Mastermind 18916 points

    Hi Steve, 

    Please let us know if the latest response has addressed your question, or if you have further information to provide so that we can further debug. If your problem has been resolved, please help mark the thread as resolved.

    Thanks and Best Regards,
    Andrew