TUSB320LI: Bus powering a Type-C, USB 2.0 dongle using 5V at up to 3A

Fred Ansfield

Part Number: TUSB320LI
Other Parts Discussed in Thread: TUSB320LAI

Hello,

I am designing a Type-C connected, USB 2.0 data-based dongle (UFP only), bus-powered device, which requires more than 1A. Is the TUSB320LI (or TUSB320LAI) the right part to use in a bus-powered device? I want to request current for 5V (only) with 1.5A or up to 3A, if needed. The datasheet shows an example schematic (Figure 20) for UFP mode, but the TUSB320LI's VDD supply pin's source, "VDD_5V", seems to imply a self-powered configuration? The D1 option diode to power VDD is helpful, but is it required for a bus-powered design? I would much rather power the TUSB320LI off a local +3.3V DC/DC, which is sourced directly by VBUS...will this work?

Thanks,

Fred

over 4 years ago

0 Malik Barton57 over 4 years ago

TI__Guru 64326 points

Hi Fred,

TUSB320LAI can be used for this kind of application. In the initial sate of your system, with TUSB320LAI powered down, will have TUSB320LAI in dead battery mode where Rd will be presented on the CC pins and the initial Type-C connection is made. D1 is not required if the application is completely bus powered (direct connection from Vbus).

0 Fred Ansfield over 4 years ago in reply to Malik Barton57

Prodigy 110 points

Hi Malik,

Thanks for your reply. I will go ahead and give this part a try.

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TUSB320LI: Bus powering a Type-C, USB 2.0 dongle using 5V at up to 3A