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LMR33620: Output 2A device, but current limit is min 1.95A.

Motoyasu Hattori
Genius 10895 points
Part Number: LMR33620

Hi,

The LM33620 datasheet says 7.5 Electrical Characteristics "Low-side current limit min 1.95 A". Is it possible to support 2A output?   If yes, please let us know the reason.

 On LM33620, we are considering 5V @ max of 1.6 to 1.7A output, and we are concerned about whether there are any restrictions on coil selection. 10uH is recommended in the data sheet, but considering the ripple current of the coil, will it exceed 1.95A?

Thanks and best regards,
M.HATTORI

  • 0
    TI__Guru 71935 points

    Hello

    The low side current trips on the valley of the inductor current ripple.

    The valley will always be lower than the average output current.  

    So the device will support 2A even with a low-side current limit below that.

    When the low-side current limit trips, the frequency will fold-back, however the output

    will still be in regulation.

    When the peak of the inductor current reaches the Isc value, then the output will fall out of regulation.

    The inductor should be rated for at least the typical value of the Isc.

    Please see the attached calculator tool.  It will calculate the recommeded inductor value

    and the current limits as well as the maximum load current.

    This spreadsheet is also on the product folder.

    Thanks

    LMR336x0_calculator_A1.xlsx