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Switching frequency for GSM

simone frasanni
Intellectual 285 points
Other Parts Discussed in Thread: LMR14030

Ho to everyone, what is the right frequency in buck converter for gsm module? A datasheet of one of this recommands a Fsw>750KHz. Is there a requirement for GSM ? Can I use a lower Fsw if I don't have problem of size?

  • 0
    TI__Guru**** 150950 points
    This would be a question for your GSM module. What can they accept.

    What is the input voltage, output voltage, and output current that you need?
  • 0 in reply to Chris Glaser
    Intellectual 285 points

    Hi Chris, thank you for your cooperation.
    I have need to realize a dc/dc converter to supply a GSM module. I have an input voltage of 4,5 to 24Vdc; I have thought to get an output voltage of 3,8V and 3Apk max (average 500mA).
    I have seen the LMR14030 which can run up to 2MHz, but I have found the TPS54xxx family which are more cheap, but they work only up to 400kHz. My doubts are if GSM module needs a minimum Fsw to avoid troubles in the trasmission bandwith.

    Thanks

    Regards

    Simone