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LMR43620-Q1: Differences between it and LMR43610Q1

Zirui Su
Expert 5340 points
Part Number: LMR43620-Q1

Hi team

I would like to ask the questions about LMR43610Q1 and LMR43620Q1:

I see the pin 1 of LMR43610Q1 is RT: we directly connect to GND and set FSW=2.2MHz;

while the pin 1 of LMR43620Q1 is SYNC/MODE: What mode (PFM/FPWM/AUTO) if this terminal is directly connected to GND?

At present, the main concern is whether the LMR43620Q1 ripple will be large in light load mode?

At present, the output current of our chip is not large. Is it easier for the LMR43620Q1 to enter the light load mode? How much output current will lead the 620 enter in the light load mode? Thank you.

  • 0
    TI__Genius 10655 points

    Hello,

    Connecting MODE/SYNC to GND results in the converter operating in PFM mode.

    I expect that the output voltage ripple will be larger at light load than at full load due to the fact that the converter will fold back the frequency at light load in order to improve efficiency. 

    The minimum peak current limit of the LMR43610Q1 is lower than that of the LMR43620Q1 meaning that the '620' will enter into PFM mode at a higher output load current than that of the '610'. The '620' enters into PFM mode once the output current reduces beyond roughly 0.5A.

    Regards,

    Harrison Overturf