Q: Can I use both internal & external power supply when powerring up MAX14827A? Which means that connect REG to V5, and connect external 5V power supply to V5 also. Will it damage the chip?
A: If the MAX14827A and the external 5V supply are power-up at the same time, this should not damage the MAX14827A.
However, there could be a problem if the external 5V supply is low while the MAX14827A is powered up. In this case, the V5 regulator would be shorted to ground, and could cause a problem. The V5 regulator needs external protection against short circuit conditions.
A: If the MAX14827A and the external 5V supply are power-up at the same time, this should not damage the MAX14827A.
However, there could be a problem if the external 5V supply is low while the MAX14827A is powered up. In this case, the V5 regulator would be shorted to ground, and could cause a problem. The V5 regulator needs external protection against short circuit conditions.