TPS25750:Question regarding the feasibility of 5V/5A power delivery via PD

Hi Yuki-san, 

TPS25750 is not recommended for new designs, we recommend to use TPS25751 which is pin-to-pin compatible, updated FW to meet the latest PD specification and comes with more configurability features compared to TPS25750. 

Ojima Yuki said:

Is it possible to supply 5V/5A using the TPS25750S?

It is possible to design 5V/5A using TPS25751D or TPS25751S depending if you want to utilize an internal or external power path. 

Ojima Yuki said:

Are there any specific devices or tools required to write a custom .bin file directly?

You'll need to configure in register 0x32 - Transmit Source Capabilities to advertise 5V/5A in one of the PDOs (i.e. PDO1) and configure the Power Path to be PP3 (PPHV/PP_EXT) instead of PP1 (PP5V) since the internal 5V power path of TPS25751 can only support up to 3A. Link for TPS25751 GUI can be found here: https://dev.ti.com/gallery/search/usbcpd 

Ojima Yuki said:

Are there any other ICs besides the TPS25750S that would be suitable for this application?

If this is for an automotive application we have other parts that have auto-qual. TPS25751 does not meet the automotive-quality as it was intended for industrial and personal electronic applications. 

One follow-up question regarding your query: 

Can you provide more details on your end application and why 5V/5A is specifically needed? Most use cases uses 5V/3A as the starting PDO and only advertise 5A at 20V capability (20V/5A at 100W capability).

Thanks and Regards,

Raymond Lin

Thank you very much for your response.

We are currently developing a device that incorporates the Raspberry Pi 5, as shown in the following URL:
https://www.digikey.jp/en/product-highlight/r/raspberry-pi/raspberry-pi-5

Since the Raspberry Pi 5 can consume up to 5V / 5A, its dedicated chargers are typically rated at 5V / 5A.
For reference, below is a link to one such dedicated charger:
https://shopstaff.jp/items/B0CX4ZWSML

The device has an opening that allows external access to the Raspberry Pi 5's USB Type-A port.
When powering external devices from this port, if the power line supplied to the Raspberry Pi 5 is not a 5V / 5A PDO (Power Data Object), the system will forcibly shut down.
To prevent this, we are planning to design a Type-C power delivery control circuit on the internal board of the device that guarantees a 5V / 5A PDO, and use it to power the Raspberry Pi 5.
Below is a simple block diagram of the system.

────────────────────────────────────────────

────────────────────────────────────────────

Please note that this project is not intended for automotive applications.
Also, thanks for your suggestion regarding the TPS25751.

Regarding the PDO configuration method you provided — can everything be completed using the TPS25751 GUI tool alone?

Thank you in advance for your support.

Dear Raymond Lin,
Thank you for your response regarding the Web GUI.

In this development, we aim to design a PD-compliant power supply that can reliably provide 5V / 5A to the entire Raspberry Pi 5 board, including USB, HDMI, and GPIO. Therefore, the objective is not only to supply power to the SoC chip itself, but also to power the entire board including its peripheral circuits.
The main use case involves tasks that place a high load on the CPU.

I have a dedicated 5V/5A power adapter for the Raspberry Pi 5 on hand.
If a PD protocol analyzer would be helpful, should I use one to check the PDO and other related information in advance?
If necessary, I don’t currently have a PD protocol analyzer, so it may take some time to obtain and investigate.
If you have any recommended products, I would greatly appreciate your advice.

Thank you again for your support.
Best regards,
Yuki Ojima

Dear Raymond Lin,

Thank you very much for your recommendation — I have arranged the purchase of the TI PD analyzer as suggested.

The following inquiry may not fall within the scope of TI E2E technical support. If there is a more appropriate point of contact, I would greatly appreciate it if you could direct me accordingly.

Regarding the TPS25751, which you recently recommended, I am considering using the TPS25751EVM evaluation module to verify its operation before proceeding to mass production. However, I have found that none of the distributors currently have it in stock. I have been searching within Japan, but if there is any information about overseas stock or alternative means of obtaining the board, I would be very grateful if you could share it.

If it proves difficult to procure the evaluation module, I am also considering building one myself using the schematic and BOM available for the TPS25751EVM. That said, I would prefer to purchase the ready-made board if possible, in order to save time.

Thank you very much for your assistance.

TPS25751EVM URL:
www.ti.com/.../TPS25751EVM

Best regards,
Yuki Ojima

Dear Chris

I understand.
Since I have a few questions regarding replicating the evaluation board, I will submit a new E2E thread for further discussion.
Thank you very much for your kind support over the extended period.

Best regards,
Yuki Ojima