3 Design Size Comparison

External FETs contribute a large amount of space on a controller design, particularly because each FET requires its own package. 80V MOSFETs typically are 5mm x 6mm in size and some 60V MOSFETs can be 3mm x 3mm. MOSFETs alone can contribute to more than 20% of a controller's total design size. Converters enable compact and power dense designs as shown between the two EVMs in Figure 3-1 and Figure 3-2

Saving space in the power-stage allows for either direct PCB cost savings or increases space available for other critical components. This alone can be worth the efficiency or BoM cost tradeoff of a converter design.