Originally Posted by O2surplus
Yes-Q1 is a P-channel MOSFET. The MOSFET is responsible for handling the actual current load of the circuit. The "brains" behind it is the LM3409 buck controller( it's the tiny IC with the 10 pins )
It looks really small though to able to handle 5 Amps. That's crazy. Does it get too hot to touch at 2700mA?