Next generation of All-in-one ICs is L9788.DonaldBecker wrote: ↑Sat Sep 07, 2019 3:42 amIn this case it's only negligibly better. MRE draws only a trivial current directly from IGN (BAT, BATPA, BATPB). Probably single digit mA when activating the main relay, and almost nothing after. The rest of the current goes through a series of linear regulators. Except during a severe voltage dip when cranking, every mW burnt by the protection diode is a mW that doesn't need to be burnt in the 6V pre-regulator transistor.kb1gtt wrote: ↑Sat Sep 07, 2019 1:43 amSee reverse polarity pmosfet noted at the below link. The pmosfet is typically better that a protection diode. https://rusefi.com/wiki/index.php?title=Manual:Hardware
It would be different if we were using something like the TLE9471, which has a buck regulator for the 3.3V or 5V supply. There the efficiency of using a MOSFET instead of a diode is worthwhile, and the chip includes a charge pump to enable using a lower-cost N-channel device.
it have Boost_Buck regulator that reduce power consumption and work well with low battery voltages.