We have a board, which is powerd by an AC/DC converter of 12V and 2A. In the board there is a 5V regulator (LM1117-T-5.0) and another of 3.3V (LM1117-T-3.3). The 3.3V one is powered by the 5V one. The 3.3V regulator powers a MSP430F149 microcontroller. The 5V regulator powers the coils of 2...