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Jim Granville
08/12/13 19:15
Read: 961 times

#189995 - .. or multiple onboard regulators
Responding to: Andy Peters's previous message
Andy Peters said:

I've done a couple of USB designs, and none of the logic requires 5V. The bus supply is always regulated down to 3.3V. Some (most?) USB micros these days have an onboard regulator which supplies 3.3V from the bus supply.

The better parts can even have multiple onboard regulators.

Take the Nuvoton NUC12x series as an example, that has 5V VBUS in,
a 5V to 3.3V regulator for the USB-Driver pins (those need 3.3V differential), and another 1.8V regulator, for the uC core logic.

The IO pins, can power from anywhere between 2.5-5.5V

List of 9 messages in thread
New SiLabs F85x/6x      Jan Waclawek      08/01/13 03:42      
   A good addition       Jim Granville      08/01/13 04:53      
      you may, as well, get used to 3V3      Erik Malund      08/01/13 08:42      
         1.8-5.5V :: is the new game in town.      Jim Granville      08/01/13 14:10      
            if i need a 3V3 chip ....      Erik Malund      08/01/13 19:48      
               Try Logic level power FETS        Jim Granville      08/01/13 20:30      
               USB 5V      Andy Peters      08/12/13 14:23      
                  .. or multiple onboard regulators      Jim Granville      08/12/13 19:15      
                     lots of chips these days have that      Erik Malund      08/13/13 08:43      

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