To fully implement this internal Blackfin regulator scheme requires an external MOSFET, a Schottky diode, a large inductor, and multiple output capacitors—a relatively expensive solution with poor efficiency that uses a relatively large PCB area. The use of the large inductors and capacitors required by the integrated regulator brings the system designer into conflict with consumer desires for portable devices to be as small as possible. Along with the relatively low efficiency of the integrated regulator controller—typically 50% to 75%—this approach is less than optimally suited for high-performance, handheld, battery-powered applications.