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LMR43620RQ5EVM-400: Evaluating the LMR43620MB5RPER

Dice-K
Mastermind 6837 points
Part Number: LMR43620RQ5EVM-400

Tool/software:

Hi support team,

I would like to evaluate the LMR43620MB5RPER using an EVM.
Is it the best way to replace the LMR43620RS5QRPERQ1 on the LMR43620RQ5EVM-400 with the LMR43620MB5RPER?

Regards,
Dice-K

  • +1
    TI__Genius 12925 points

    Hi Dice, 

    That should work. I would actually recommend using the LMR43620MQ3EVM-2M to avoid having to depopulate the RT resistor (R8). Either way, you might want to use a different inductor to optimize current ripple as you will have a different factory frequency (1 MHz for the LMR43620MB5RPER and 2.2 MHz for the equivalent auto part). Equation 7 in the datasheet can give you more details on this or you are welcome to spec your application according to our tested typical values in section 9.2. 

    Thank you,

    Joshua Austria

  • 0 in reply to Joshua Austria
    Mastermind 6837 points

    Hi Joshua ,
    Thank you for your support.

    The inductor of the LMR43620RQ5EVM-400 is 5.6μH.
    When calculating "K" under the following conditions, it is within 0.2 to 0.4, so I will use the 5.6μH of the LMR43620RQ5EVM-400 as the default.
    (The RT resistor will be removed.)

    VIN = 24V
    VOUT = 5V
    IOUT = 2A
    K = 0.35

    VIN = 12V
    VOUT = 5V
    IOUT = 2A
    K = 0.26

    Best regards,
    Dice-K

  • 0 in reply to Dice-K
    TI__Genius 12925 points

    Hi Dice-K,

    Sounds good. I wish you well on evaluating your application.

    Joshua Austria