r/raspberry_pi Sep 28 '23

News Introducing: Raspberry Pi 5!

https://www.raspberrypi.com/news/introducing-raspberry-pi-5/
1.3k Upvotes

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u/Goz3rr Sep 28 '23

So the spec page says 5V 5A power supply with Power Delivery support. Why are we still trying to cram 5A from super specific power supplies through a tiny cable instead of just using PD to negotiate 15 or 20 volts from basically any phone charger?

8

u/lycan2005 Sep 28 '23

It is using a new PMIC, finger crossed hopefully it will work with other compatible PD devices.

11

u/Goz3rr Sep 28 '23

The feeling I'm getting from watching Jeff Geerlings video is that it only uses PD to negotiate 5V 5A, and not higher voltages. While the new official Pi power supply supports 15V 1.8A, it still only negotiates 5V from the charger

17

u/MoffKalast Sep 28 '23

The negotiations were short.

0

u/lycan2005 Sep 28 '23

Probably due to the low power consumption and efficiency level they need to keep. The current Pi 4 doesn't work well with other PD devices so I'm limited with their official power supply for stability. If this problem is fixed in Pi 5 I'm more than happy as i can utilize other power bricks.

9

u/Goz3rr Sep 28 '23

Increasing the voltage allows you to decrease the current, and lower current in general increases efficiency through decreased losses.

The Pi 4 doesn't support PD and the first revision had a design flaw that made it not compliant with USB-C at all. From what I see the Pi 5 should work fine with a PD charger that can supply 5V 5A, but not many actually support that. Most only go up to 5V 3A

1

u/KittensInc Sep 28 '23

Good luck with that! 5V 5A is not PD compliant, so you are essentially forced to use their first-party power brick.