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LMR33620: Mode transition, overshoot

Taketo Sato
Genius 9475 points
Part Number: LMR33620

Hello team,

I have a question about LMR33620's mode transition between PWM mode and PFM mode.

We see somehow overshoot with the device around 150mA load under 24Vin and 18Vo condition. We would like to understand if the behavior is due to LMR33620 or any other reason. What I would like to confirm are below. Could you please answer these?

Can the device cause about 25mV overshoot when transition happens?

What mA is expected as transition threshold with 24Vin, 18Vo condisions? Is 150mA reasonable value?

Best regards,

  • 0
    TI__Guru 57555 points
    It is reasonable to see 25mV of overshoot when the device changes modes.
    It is difficult to predict the exact load at which the mode will change.
    However, a value of 150mA for the mode change is a reasonable value.

    If you can show us your schematic we can help to review your design for you.