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MAX3232E: Icc current under 3.0V

Yue TANG
Expert 8485 points
Part Number: MAX3232E

Hi,

My customer met a problem. the Icc current reached to 16mA  if power supply is  smaller than 3.03V. but once beyond this voltage, the Icc current is normal.  would you please suggest what may go wrong?

BTW, power supply directly power MAX3232E, other circuit is  disconnected.  

 

  • 0
    TI__Mastermind 25705 points

    Hi,

    Unfortunately this is true behavior of the device. When the supply is too low (<3.0V), the charge pump of MAX3232E keeps charging that draws lots of Icc current. When Vcc reaches the recommended level, the output voltage is above 5V and the charge pump only turns on when it's necessary.

    Regards,

    Hao 

  • 0 in reply to Hao L
    TI__Expert 8485 points

    Hao,

    Thanks for reply. Where can I find related description and test report?  customer would like to dig into this issue. because their power supply is close to 3.0V, According to your comments, They do can observe duty circle change at charge pump pin when power supply change. they want to know, From long term perspective, if charge pump has to works under this manner, if there is a potential risk.

  • 0 in reply to Yue TANG
    TI__Mastermind 25705 points

    Yue,

    There is no reliability concerns if the Vcc is close to 3.0V. I sent you some lab data by email.

    Regards,

    Hao