New MacBook Pros have 2100A USB2 ports for charging

Discussion in 'MacBook Pro' started by DarwinOSX, Mar 26, 2011.

  1. DarwinOSX macrumors 65816

    Joined:
    Nov 3, 2009
    #1
    New MacBook Pros have 2100A USB2 ports for charging
    http://www.macnn.com/articles/11/03/25/equals.capacity.of.ipad.wall.charger/
    updated 11:05 pm EDT, Fri March 25, 2011
    Equals capacity of iPad wall charger
    Unannounced by Apple but verified by its own System Profiler, the new 2011 MacBook Pros feature a combined 2100mA of current available for peripherals charging through the USB2 ports -- seemingly made possible specifically for charging the iPad at the same rate as a wall charger would provide. The change is a significant bump from the previous models, which could only address a maximum of 1100mA and output no more than 500mA across multiple ports.

    Although some Apple devices have been able to support up to 1100mA to USB devices for years (starting with the mid-2007 20- and 24-inch iMacs), this level of output was limited to one external device until the early-2009 Mac minis, which offered a total of five USB ports and could supply 1100mA to three of them simultaneously. The mid-2010 MacBook Pros could also supply 1100mA to up to two devices. Most iPhones and iPods only require 500mA to charge, but the iPad needs at least two amps.

    Although an iPad can be charged from existing USB ports, it cannot be used and charge at the same time when connected by USB port on any Mac other than the 2011 MacBook Pros, and takes a great deal of time to charge (around 10 hours for a full charge at 500mA).

    While Apple continues to recommend the wall charger as the fastest way to recharge an iPad or iPad 2, it appears that new MacBook Pro owners have a second option. [via 9to5Mac]
     
  2. borisiii macrumors 6502

    Joined:
    Jul 4, 2010
    #2
    That article is so full of mistakes it's hard to believe anything they say...

    I have no problem charging and using my iPad from my 2008 MacBook. It takes about twice as long compared with the iPad adapter but that's not really an issue.

    Secondly, they must mean 2100mA, i.e. 2.1A. The power supply into a house is only 60A.

    While I can believe that the new MBPs charge the iPad at the same speed as its adapter, I wouldn't pay much attention to anything else in that article.
     
  3. james.fry macrumors newbie

    Joined:
    May 15, 2011
    #3
    Yes, they do. Except that they mean 2.1A at 5W (ie 10.5W) vs the 60A at 110 or 220V (ie 6600W or 13200W) depending on where you live in the world.

    Power consumption can only really be compared easily when measured in watts.
     
  4. Macsavvytech macrumors 6502a

    Macsavvytech

    Joined:
    May 25, 2010
    #4
    Isn't that what was in the article?
    It says 2100mA?
     
  5. harcosparky macrumors 68020

    Joined:
    Jan 14, 2008
    #5
    Yup the article clearly states 2100mA.
     

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