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What Power Does my Raspberry Pi PCB Need?

This a table showing the measured power consumption of various Raspberry Pi PCBs

 Pi PCB Type and Configuration   +5V ma  +5V Watts  Notes
       
 Pi B - Headless (no HDMI, USB or Camera attached)   400   2.0  
 Pi B - Just HDMI   400   2.0  
 Pi B - HDMI, USB Mouse and Keyboard   450   2.25  
 Pi B - HDMI, USB Mouse, Keyboard & Camera   700   3.50  Peaky Current*
 Pi B - HDMI, Camera Only   650   3.25  Peaky Current*
       
 Pi B+ - Headless (no HDMI, USB or Camera attached)   240   1.2  
 Pi B+ - Just HDMI   240   1.2  
 Pi B+ - HDMI, USB Mouse and Keyboard   300   2.5  
 Pi B+ - HDMI, USB Mouse, Keyboard & Camera   490   2.45  Peaky Current*
 Pi B+ - HDMI, Camera Only   420   2.1  Peaky Current*
       
 Pi 2B - Headless (no HDMI, USB or Camera attached)   290  1.45  
 Pi 2B - Just HDMI   290  1.45  
 Pi 2B - HDMI, USB Mouse and Keyboard    350  1.75  
 Pi 2B - HDMI, USB Mouse, Keyboard & Camera    520  2.6  Peaky Current*
 Pi 2B - HDMI, Camera Only   480  2.4  Peaky Current*
       
 Pi 3B - Headless (no HDMI, USB or Camera attached)   320  1.6  
 Pi 3B - Just HDMI   320  1.6  
 Pi 3B - HDMI, USB Mouse and Keyboard    400  2.0  
 Pi 3B - HDMI, USB Mouse, Keyboard & Camera    570  2.85  Peaky Current*
 Pi 3B - HDMI, Camera Only   500  2.5  Peaky Current*
 Pi 3B - 7" LCD Display Only   900  4.5  Peaks at 1.2 Amps 
 Pi 3B - 7" LCD Display and Camera   950  4.75  Peaks at 1.2 Amps **
       
 Pi 3B+ - Headless (no HDMI, USB or Camera attached)  480  2.4
 Pi 3B+ - Just HDMI  480  2.4
 Pi 3B+ - HDMI, USB Mouse and Keyboard   510  2.55
 Pi 3B+ - HDMI, USB Mouse, Keyboard & Camera    640  3.2  
 Pi 3B+ - HDMI, Camera Only  610  3.05  
 Pi 3B+ - 7" LCD Display Only  990  4.95  
 Pi 3B+ - 7" LCD Display and Camera  1200  6.0  
 
       
 Xtronix Power Over Ethernet Adapter Maximum   1250    6.25  ***
       ** When camera LED on
 Table Rev 3 (c) Xtronix Ltd 2018       *See below for details

Notes:

The Xtronix PoE adapter can supply up to 1250 mA of current (6.25 Watts) and is more than adequate to supply the Pi PCBs in the above configurations.

*** On the RPi 3 Model B+, it is recommended that the maximum PoE power drawn is 1amp from the Xtronix PoE adapter. The Xtronix PoE adapter can supply 1.25 Amps, but the RPi PCB may need forced air cooling as there is some extra heat generated by the PoE adapter.

The above figures are 'typical. They are measured on one example of each configuration using a Tektronix Digital  oscilloscope with a Tektronix current probe. The operating system on each PCB (except the RPi 3 Model B+) was Raspian from NOOBS 1.8. Raspian GNU/LINUX 9 was running on the RPi 3 Model B+.

The RPi 3 Wi-Fi was operational during the testing.

The above are 'steady state' measurements and it should be noted that during Boot Up and other times the current drawn (and hence the power) peaks above these values. In general terms, during boot up, the current peaked to twice the above values.

* Peaky Current

Here are some oscilloscope traces showing the 'Peaky Current' when the camera is used. Note: these are 'current' traces not 'voltage' traces.

 

 

 

Copyright © Xtronix Ltd. All rights reserved. May 2018 - Rev 9