I understand the question. No idea about an answer. At first I thought perhaps a mistake, but the pinout is different so it looks deliberate. Could be a noise consideration but I would think you would want the least amount of noise on the 5 volt supply if that is what powers the receiver. One has lower quiescent current.
From: Rory Conaway Sent: Tuesday, March 22, 2016 9:29 PM To: [email protected] Subject: [AFMUG] FW: Circuit design I got this from a buddy of mine who is working on a circuit. His basic question is why two different regulators. If anyone can enlighten him, and me, I’d appreciate it. I'm using an existing circuit to create a custom PCB. The board I am using as an example has a 5v and a 12v regulator, both capable of 3A to be used for video transmitters. They both use 100uH inductors as filters which is far larger than the specified ones for the regulators. They selected an MPS MP1584EN for the 12V regulator and an MPS MP2303ADN for the 5V regulator. >From looking at the specs, they are very similar in functionality. I'm >wondering why they selected 2 different regulators instead of the same one for >both sides. This is for a drone and the power source is a 4-6S LiPO running >between 13.5- 25.2V. Can you shed some light as to why they picked different >regulators for these? I have attached the DataSheets for both of those regulators. Thanx. - Robert Beaubien - Sr. Software Architect - Kool Software LLC “Dear Algebra, Please stop asking us to find your X. She's never coming back and don't ask Y.”
