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TPS2513: Make USB powered application compatible with most of today's high current smart chargers

Erlend Hestnes
Prodigy 60 points
Part Number: TPS2513

Hi,

I have a PCB design question regarding current negotiation in USB powered devices. I have an application which require me to supply at least 1A of USB current. My plan was to make this application compatible with most of today's USB smart chargers (from Apple and others). My understanding is that there exists several ways to negotiate current from such devices, some have different voltage levels on D+ and D-, while others just short together D+ and D- etc. I found the TPS2513 in your product portfolio which is intended for USB charging of different devices. This is IC automatically detects the USB data line configuration, which enables connected devices to charge with their maximum supported current. My question is, can this same IC be used the other way around to actually make a USB powered device compatible with *almost* all USB chargers? My plan was to just use the TPS2513 and hook up the IN line to the VBUS line.

Do you see any issues with this approach, or do you have any better suggestions on how to do this? I can see one problem scenario where there is a TPS2513 on the charger itself and a TPS2513 in my application, would that cause a conflict?

Best regards,
Erlend

  • 0
    TI__Intellectual 990 points
    Hi Erland,

    The TPS2513 is a USB Type-A Dedicated Charging Port Controller, which means it is intended for charging applications (i.e. chargers). With Type-A ports, they can only be a source of power and can never sink power. This means that you cannot have two Type-A ports connected to each other. Notice that no Type-A to Type-A cables have ever been made.

    Type-A ports have four lines, VBUS, GND, D+, and D-. On the device side, the implementation is commonly done with a microcontroller/processor which can take in USB data (if necessary) and VBUS lines can be simply used to power the system directly. Any USB powered device is already compatible with most USB chargers, but the power it can consume will depend on the charger's capabilities.

    Do you ever intend to use USB data through the charger? If so, this part may not be right for you.

    Jaime
  • 0 in reply to Jaime C
    Prodigy 60 points

    Hi Jaime,

    Thanks for your excellent reply. Did some other reading on the internet as well as some practical tests with different USB chargers, and it seems that every USB charger that I tested always delivers their maximum amount of current if the load is correct. My application is only going to sink power and the data lines is not going to be used. Thus, I now understand that I don't need any negotiating of current for my application.

    Best regards, 
    Erlend Hestnes