TUSB7340 Power Dissipation running in USB 2.0 Mode

Michael Stibila

Other Parts Discussed in Thread: TUSB7340

The TUSB7340 Datasheet does a good job specifying device Power dissipation in Superspeed mode (USB 3.0). Can you give the power dissipation when 0, 1, 2, 3 and 4 channels are running in USB 2.0 Mode.

over 9 years ago

0 Elias Villegas M. over 9 years ago

TI__Guru* 76130 points

Hello,
The I/O portion of the device is the one that draws more power and it is the same no matter the downstream device is HS or SS, so you can take the SS numbers as a reference for High-speed as well.
Regards

0 Michael Stibila over 9 years ago in reply to Elias Villegas M.

Prodigy 205 points

Elias,

The answer seems counter intuitive. USB3.0/Superspeed is almost 10X faster than USB2.0. Even with an additional Data Path in USB 3.0, each 3.0 data path is running at 5X the speed of USB 2.0. data path. Since most of the power is dissipated transitioning from low to high or high to low, 5X transitions would still yield 5X the power in each bus. Do you have measured data that supports your answer. The answer is critical because, my customer is considering your competitors parts due to the "high power dissipation" of your device. Thank you.

0 Elias Villegas M. over 9 years ago in reply to Michael Stibila

TI__Guru* 76130 points

Hello,
The Vdiff in USB3.0 is much lower than in USB2.0, it is also AC coupled, that is why it is almost the same current draw no matter the frequency. The data is correct, please provide more information about Customer's implementation and we can provide further support to their design.
Best Regards

0 Michael Stibila over 9 years ago in reply to Elias Villegas M.

Prodigy 205 points

Thank you, that explains it.

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TUSB7340 Power Dissipation running in USB 2.0 Mode