7.8. Logic power output (5V)
The Jrk G2’s 5V pins provide access to the board’s 5V logic supply, which comes from either the USB 5V bus voltage or a 5V regulator powered by VIN, depending on which power source is connected. If power is supplied via VIN and USB at the same time, the Jrk uses VIN.
The 5V regulator on the Jrk G2 is a low-dropout (LDO) linear regulator. The amount of current you can draw from the regulator without it overheating depends on factors like the supply voltage, motor current, and ambient temperature. If the board is in a room temperature environment with no other components generating significant heat (i.e. the motor current is low), you should be able to get around 70 mA out of the regulator regardless of the input voltage. Under the worst conditions, with the supply voltage and motor currents near their limits, the available regulator current will be closer to 30 mA.