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LMR33620-Q1: question about "AGND TO PGND" spec

Jay wang
Intellectual 2361 points
Part Number: LMR33620-Q1

Tool/software:

hi expert

i have two questions about "AGND TO PGND" spec:

Q1: whether do the following spec(-0.3v ~0.3v) to show the stable performance of "AGND TO PGND"?

Q2: if some (high frequency)noise or transient appear and is over -0.3v~0.3v, whether can device be affected? like 0.5V but 1ms noise is between "AGND TO PGND" 

  • 0
    TI__Genius 12955 points

    Hi Jay,

    That spec is the expected range of voltages from AGND to PGND due to the device's operation. Per section 10.1.1 of the device datasheet:

    Due to normal operation of the device, it is expected that some noise will emanate from the PGND net momentarily.

    Noise outside of the datasheet ranges is not expected on AGND to PGND and may result in damage to the device. Is the noise that is appearing from the device itself or is there a potential source of noise that is injecting 0.5 V between AGND to PGND.

    Thank you,

    Joshua Austria

  • 0 in reply to Joshua Austria
    TI__Intellectual 2361 points

    hi Austria

    assuming the layout or system noise is very bad, and voltage between AGND and PGND is over -0.3v~0.3v. BUT this noise/voltage doesn't last too long, our device can be damaged?

  • 0 in reply to Jay wang
    TI__Genius 12955 points

    Hi Jay,

    In general, yes keeping within the ABS MAX specs given by the datasheet is the only way for TI to ensure that the part will not be damaged in nominal operation.

    I can help review your schematic and layout if you want? 

    Thank you,

    Joshua Austria