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TPS2513: Recognizing whether a device is connected to a USB power source

Rainer Birkelbach
Prodigy 10 points
Part Number: TPS2513
Other Parts Discussed in Thread: TPS2546

Hi,

I am planning a USB-charger where we use the TPS2513 to negotiate the charging current.

The only problem is the comparably high supply current of the TPS2513 at around 150uA.

I would rather have a few uA for reasons of efficiency (Yes, I know 150uA is only a few milliwatt at 5V, but yet...)

Here my questions:

1. What happens, when the IN power supply for the 2513 is removed while DP and DM are connected to the device to be charged?

If the 2513 withstands that, we could turn IN on when recognizing a certain amount of charging current drawn.

2. Is there possibly a device similar to the 2513 but with far less power consumption?

Best regards

Rainer

  • 0
    TI__Mastermind 27525 points

    Hi Rainer,

    Thanks for point your question here on E2E.

    1. The portable device would see this as a disconnect, and stop pulling current from VBUS. It would then re send the detection signal over the D+ line to see if there is a BC1.2 charging device on the other end, and since the TPS2513 is now off, no signal will be sent back to the portable device. The portable device then determines that there is an SDP device on the other end, and sinks only 500mA of current as opposed to the 1.5A that a DCP port is capable of.

    2. As far as similar devices, you can use the TPS2546 family of devices. It consumes more power (around 250uA), but it can be put into a low power state when there is no device connected to it. It also has an internal power path. The part can also handle data, and advertise all three BC1.2 charging modes (DCP, CDP, SDP)

    If this helped answer your question, please click This resolved my issue