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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 **
       
 Xtronix Power Over Ethernet Adapter Maximum  1250  6.25
       *see below for details
 Table Rev 2 (c) Xtronix Ltd 2017       ** when camera LED on
       

Notes:

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 was Raspian from NOOBS 1.8. 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.

 

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.

 

Copyright © Xtronix Ltd. All rights reserved. June 2017 - Rev 8