TPS25751: 30W sourcing PD port reference design without battery

Hi Shinod, 

Couple follow-up questions to help clarify the design: 

1. For 30W sourcing/output from TPS25751, what are the PDO capabilities (voltage/voltage rating and types of PDO)? 

2. What is the input voltage range requirement for the DCDC? 

Thanks and Regards,

Raymond Lin

PD profile details are 5V/3A, 9V/3A, 15V/2A and 20V/1.5A. supply input voltage of this device are 24V DC input.

Actually we are looking the low cost solution, kindly suggest if you have any other PD controller chip?

Hi Shinod, 

What other capabilities are needed from the PD controller perspective? Is this port design specifically just for charging/power delivery or do you need to also support USB data, BC1.2, etc.?

Thanks and Regards,

Raymond Lin

HI Raymond Lin,

We need PD3.0 charging/ Power delivery along with BC1.2 only we do not required any USB data communication other than BC1.2.

Request to share the reference design as soon as possible to start the design activity.

Hi Shinod, 

Is there a specific DCDC you're looking to pair with TPS25751? 

Thanks and Regards,

Raymond Lin

Hi Raymond Lin,

Any low cost 3A Dc DC converter is ok, Request to share the reference design as soon as possible.

we need to finalize the design soon.

Hi Shinod, 

I'll forward this thread to the DCDC team for their input, on the PD side (TPS25751) here are my recommendations: 

1. Utilizing GPIOs of TPS25751 to configure DCDC FB pin, here is an old reference schematic of utilizing the GPIOs of a PD to configure the DCDC FB: 

2. When configuring TPS25751, keep in mind this device has the capability to advertise Rd on the CC line during dead battery boot-up (TPS25751 is first boot from VBUS instead of VIN_3V3). You'll either need to implement MCU logic flow to clear the dead battery flag once the entire system is boot up in order to assume the source role or have some discrete circuit to prevent the CC line from connecting until system+PD is booted up. 

Thanks and Regards,

Raymond Lin