2

How to safely power the Pi 4, more specifically:

  1. What voltage levels are safe to power the Pi 4 via the USB-C connector or via the GPIO header?

  2. What are the current requirements?

  3. What Power Management ICs / voltage regulators are used by the Pi 4? The official schematics seem to lack a description of U2 and U3.

2
  1. Voltage level

The power management IC (PMIC, see section 3) is a MXL7704 with an input voltage range of 4.0 V to 5.5 V and an absolute maximum rating of 6 V that must not be exceeded.

Considering that the downstream USB ports are directly connected to the 5 V power rail the 5 V supply should also comply with USB electrical specifications: 4.45 V to 5.25 V (USB 3.0)

(TBC): Furthermore the "Power good" pins of the PMIC used on the Pi 3B+ (and thus likely on the Pi 4 too) was used to trigger the low voltage warning at 4.63±0.07 V (Raspberry Pi Power Limitations).

The reasonable voltage range to power the Pi therefore is: 4.7 V to 5.25 V


  1. Current requirement

Raspberry Pi 4 spec recommends a 3 A supply (15 W), with a minimum current of 2.5 A if downstream USB peripherals consume less than 500 mA in total.


  1. PMIC

The Foundations blog shows this picture of the power management section on the PCB. The PMIC is a MXL7704 - the same IC is used on the Pi 3B+.

enter image description here

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.