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How much current can be drawn from USB port?

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alphadog

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I'd like to connect my PCB (which has a USB Type B connector on it) to a PC.
Where can i find out how much current the USB port in PC can provide?

Thank you.
 

Mike_2545

Super Moderator
I think its less that 100Ma. Somewhere around 60-70Ma. Unless you have a USB hub.
 
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Sceadwian

Banned
hubs will often further limit your current if it's a passive hub because the hub will be drawing power itself. the bulk majority of USB hubs out there today are bus powered. Only powered hubs are proof against this and even then it's up to their supply.
 
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