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MAX3232 switching frequency of the charge-pump

MAX3232 switching frequency of the charge-pump

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Juergen Austen
Posted by
on Jul 25 2011 08:01 AM
Prodigy80 points

Hello,

does anyone know the switching frequency of the charge-pump at the MAX3232  ?

I need to know to prevent other parts on board to be influenced of the switching frequency

 

Thanks,

Juergen

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  • Ron Michallick
    Posted by
    on Jul 25 2011 10:46 AM
    Verified Answer
    Verified by
    Mastermind30490 points

    Hello   Juergen,

    The internal frequency of the charge pump is 500kHz. There are no data sheet specifications, but it is very reasonable to expect the frequency to always be within -50%/+100%, 250kHz to 1MHz.

    However, the charge pump switches run on a as needed basis to keep V- and V+ at 5.5V. For example, with 3k loads on each driver, the MAX3232 ran one pulse every 12uS (VCC=3.3V).

    Regards,
    Ron Michallick

     

    Regards,
    Ronald Michallick
    Linear Applications

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