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MAX3237E: 3237

Ray Vincent Aranzaso
Genius 16780 points
Part Number: MAX3237E

Hi,

Good Day.

I want to use the TI MAX3237ECDB as a drop-in replacement for an existing design.

The existing design has used the Maxim MAX3237CAI, ST Micro ST3237EBPR, and Intersil ICL3237ECAZ. All of these parts are pin-pin compatible.

I power the device with 3.3V and use 0.1uF ceramic X7R capacitors for the bypass and charge pump capacitors (C1-5 on your datasheet).

What I am concerned with is that your datasheet seems to indicate that 0.1uF caps will work for 3.3V ± 0.15V but suggests larger 0.22uF caps for 3.3V ± 0.3V.

While I believe my regulated supplies will hold a 5% tolerance, I am concerned that the other equivalent parts do not imply you need large caps for larger tolerances.

I want to be sure that the TI version is fully compatible with the other parts that only require 0.1uF caps.

Can you confirm that your part will work with 0.1uF caps even with a slightly larger than 5% power supply tolerance?

Please advise. Thank you very much.

Best Regards,

Ray Vincent

  • 0
    Guru 290240 points

    There is a reason for that separate specification.

    I suspect the problem happens only at the worst case, i.e., 3.0 V, most extreme temperature, and capacitors affected by DC bias. Regarding the last one, do you know the characteristics of C1.…C5? What package size are you using?

  • 0
    TI__Mastermind 47887 points

    Hi Ray,

    The device will work with 0.1uF - but that specification is there for a reason - you may see some issues at the output (noise mainly) as at worst cases with 10% tolerance the 0.1uF caps there may not be enough capacity to give a well regulated output. 

    That being said -comp devices do have this spec clearly in their datasheet - its a similar spec - I highly suggest the customer look at competition devices before trying to say ours work worse - because all comp devices have a similar req. 

    ST device

    MAX device

    ICL device

    Every single device has a similar spec and is clearly printed in comp datasheets.

    Best,

    Parker Dodson