TPS2544: Schematic review

Hi Adam,

We appreciated your great support!

If customer spec is 5V/1.5A (short D+/D-)for android , 5V/2.4A (D+/D- 2.7V) for Apple.

They want to use TPS2561 A+TPS2514A. could these solution support this case?

They think TPS25810 is too high level.

Could you tell me the difference between TPS2561 A+TPS2514A and TPS25810?

Many Thanks,

Jimmy

Hi Jimmy,

A USB Type-A solution is not the same as a USB Type-C solution. In addition to the DP/DM lines, you also have CC pins which communicate power advertisements as well.

SO for a Type-C port, you have to have a resistor connected to the Type-C port to advertise the ports source capabilities. You can advertise either 900mA, 1.5A, or 3A capabilities. Since the customer is wanting to implement 2.4A apple charging, then they will need to advertise 3A capabilities on the CC pins. 

This is why I recommend the solution shown in the figure above

Hi Adam,

Thanks for your great support ! I have told to our customer.

We want to ask expert, Customers used Type A terminals, but now they want to use Type C terminals. They just want to change terminals, but they don’t have to support USB Type C charging specifications.

They only consider D+/D- for fast charging. If they don’t To consider the CC PIN, is it possible not to use TPS25810? They want to useTPS2561A+TPS2514A.

Please see schematic as below:

Many Thanks,

Jimmy

Hi Jimmy, 

Why does the customer want to switch to USB Type-C but not support USB Type-C? 

Based on the schematic you shared, the customers system would be considered a non-compliant USB Type-C charger. With USB Type-C, you are not allowed to present a hot 5V on VBUS. You can only present 5V on VBUS when a device has been detected using the CC pins. This is what the TPS25810 does. It advertises source capabilities using an Rp on the CC pins, detects when a device has been connected, and then closes the internal power path presenting 5V on VBUS. How your system is set up right now, 5V will always be present on VBUS without any negotiate on the CC pins which is not allowed for a USB Type-C charger.

So I strongly recommend you push the customer to use a TPS25810 + TPS2514 solution 

Dear Adam,

Thanks for the comments. We appreciated your great support!

Our customer believe your proposal of TPS25810 with TPS2514 is a good solution on standard USB C-type charger.

They want to ask you , could TPS2513A with TPS2561A solution support the BC1.2 charger and Apple 2.4A charger on USB A-type if we don't

need to negotiate on CC pins?

Thank you very much.

BR,

Jimmy

Yes, for a USB Type-A connection, the TPS2513A with TPS2561A is a good solution