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LM3409HV: Power Sequence of Power Off

Julian Chen
Expert 2550 points
Part Number: LM3409HV

Hi E2E,

Our customer power sequence of power off as below.

Did  it have any risk at period of VOUT> VIN to UVLO?

Thanks!

  • 0
    TI__Mastermind 28655 points
    Hello Julian,

    There should be no issue if the power is just being shut off. The P-MOSFET has a body diode that will clamp Vout to Vin through Rsns. The current will rise as Vin gets near Vout dependent on the inductor ripple current of your design. This is before the 'RISK' area you have shown above.

    Best Regards,