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Tuesday, August 16th 2011, 12:05pm

MAX1776 + 4700 uF ?


I have a question about the Round Solutions application note "Power Supplies: from 6.0V...8.4V to 3.8V (for GM862 Modules)" (May 2005).

The suggestion is MAX1776 with a 4700 uF output capacitor. My question is, have you actually tested this, and if yes, up to which input voltage?

The datasheet recommended output capacitor is 100 uF. 4700 uF is 47 times more, and often these devices rely on the output capacitor for stability, so I'm sceptical reading it. Has anyone tried it?


Tuesday, August 16th 2011, 7:28pm

RE: MAX1776 + 4700 uF ?

I don't know how has written this. That is not my opinion.
I suggest to use a very low ESR (<15mOhm) from app. 330µ up to 470µ near to the power input pin from the modem.

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