Answers.Body: <p>As seen in the schematics, pin 4 of all of the input and output ports plus the 5V on the USB host port is connected to VCC5V/VCC5VIGEN, which is supplied by U23 (the analog/digital converter is also connected to this, but current draw for that is negligible). U23 is a <a href="https://www.ti.com/product/TPS2041B" rel="nofollow noreferrer">TPS2041BDBVR</a> which limits the current to 1A and has a continuous current of 500mA.</p>
  <p>So all ports and USB need to be considered at the same time and must not exceed 500mA on average or 1A peak.</p>
  
Answers.ContentLicense: CC BY-SA 4.0
Answers.CreationDate: 2021-04-23T17:57:37.563Z
Answers.LastActivityDate: 2021-04-23T17:57:37.563Z
Answers.UserDisplayName: David Lechner
Body: <p>The LEGO EV3 <a href="https://education.lego.com/v3/assets/blt293eea581807678a/blt471320cb14ed0291/5f880386631d5a2165df4144/lego-mindstorms-ev3-hardware-developer-kit.zip" rel="nofollow noreferrer">Hardware developer kit</a> says that the fourth pin of the input or output port provides a voltage of 5 volts but doesn't give the maximum current that can be drawn from the pin.</p>
  <p>What is the max current that can be drained from the VCC pin (pin 4 at 5V)?</p>
  
Tags: <ev3><electronics>
Title: What is the max current for the EV3 I/O port's VCC pin (pin 4)?
UserDisplayName: amreo
ThreadText: # What is the max current for the EV3 I/O port's VCC pin (pin 4)?
  
  (Asked by: username_0 on 2021-04-23)
  
  The LEGO EV3 [Hardware developer kit](https://education.lego.com/v3/assets/blt293eea581807678a/blt471320cb14ed0291/5f880386631d5a2165df4144/lego-mindstorms-ev3-hardware-developer-kit.zip) says that the fourth pin of the input or output port provides a voltage of 5 volts but doesn't give the maximum current that can be drawn from the pin.
  
  What is the max current that can be drained from the VCC pin (pin 4 at 5V)?
  
  **Tags:** ev3, electronics
  
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  ## 1 answers
  
  ### Answer by username_1 on 2021-04-23. Score: 4 | Accepted answer
  
  As seen in the schematics, pin 4 of all of the input and output ports plus the 5V on the USB host port is connected to VCC5V/VCC5VIGEN, which is supplied by U23 (the analog/digital converter is also connected to this, but current draw for that is negligible). U23 is a [TPS2041BDBVR](https://www.ti.com/product/TPS2041B) which limits the current to 1A and has a continuous current of 500mA.
  
  So all ports and USB need to be considered at the same time and must not exceed 500mA on average or 1A peak.
  
  
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