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I am highly pessimistic that a charge pump type converter will work since the phone will start to pull 500 mA as soon as it's connected, if I can find one that supports a constant 500 mA without massive caps then maybe
My circuit involves an AVR microcontroller and a MAX3421E USB host interface IC. This IC is exactly the same one as what is used on the "USB Host Shield" and "Android Accessories Development Kit" for Arduino. The circuit is powered at 3.3V, not 5V, keep that in mind. The 3.3V supply comes from a...
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