Hello. I am doing a project that involves powering the teensy 3.2 from the Vin pin. We are using a 12V DC voltage source which is then fed into a voltage regulator. My friend originally was using a voltage regulator that supplied 5V up to 1A. The datasheet for that LDO is found here. I thought that this could potentially damage the teensy with too much current, and found another LDO that provides 5V at 150mA. The datasheet for that device is found here.

My question is: is there a valid reason for me to switch from my friend's regulator to mine? And is there a maximum input current that Vin can take? The system was working with the old LDO but when I showed this project to an experienced EE he said that I should look into getting a new regulator since the old one was capable of producing a lot of current.

Thanks for the help as always!