• Resolved

LMR23625-Q1: UVLO operation

Part Number: LMR23625-Q1

Hi

I would like to know about UVLO operation. There are two UVLO for this device.

 1. VIN_UVLO

      Does this device restart by soft-start when VIN is recovered to over VIN_UVLO?

      (In this case, EN is connected to other supply rail to keep high level during VIN UVLO.) 

2. VCC UVLO

     Does this device restart by soft-start when VCC is recovered to over VCC_UVLO?

      (In this case, EN is connected to other supply rail to keep high level during VCC UVLO.) 

Regards,

Koji Hamamoto

  • Hi,

    I think in general the VCC UVLO is overlapping VIN UVLO.

    I tried in the lab by tying EN to a different rail (3.3V) and ramping VIN close to 3.6V and the part will soft-start

    But be careful, on the datasheet abs max for EN pin is VIN + 0.3V. Therefore when VIN is 0, it is not advisable to put EN to be 3.3V

    Thanks

    -Arief

  • In reply to Arief Hernadi:

    Hi Arief-san,

    I am terribly sorry for the delay in my reply.

    I understood.

    Regards,
    Koji Hamamoto