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LMG5200: pushing frequency limit

Part Number: LMG5200
Other Parts Discussed in Thread: LMG1210

Hello everyone,

I wonder if it would be possible to use this IC for an 13.56 MHz (NFC) application e.g. driving a resonant circuit at this frequency.

The datasheet states that it "is capable of driving the GaN FETs at frequencies up to 10 MHz" and that the dissipated power has to be taken into consideration. But the logic seems to be abled to capture signals up to 100 MHz (10ns). Is 10 MHz a hard limit of this IC (maybe limited by the rise&fall timing or the dissipated power) or would it be possible to push the limit up to 13.56 MHz (sacrificing max current/power capacity)?

best regards,

Christian

  • Hello Christian,

    Thank you for your question. LMG5200 could work at the frequency you mentioned with sufficient cooling. The reason for having 10MHz is mainly about thermal concern. Also another solution could be the LMG1210 with an external FET just because it could possibly bring you lower switching node to ground capacitance or equivalent Coss, just for the purpose to help you reduce the circulating current for realizing soft-switching.

    Hope it helps.

    Thanks and regards,
    Lixing