A classification of power controllers is also possible based on the output current range and efficiency. The pictures on this slide show the regulator IC (solid block) with output filter and FET switches. By definition a converter is a switching regulator with an integrated switch (HS only, or both HS and LS). Since these are integrated, the output current is limited by the device itself, typically up to 5-6 A in the ST portfolio. In a switching controller the power elements, the FETs, are external. The output current is limited by the size of the external FETs and it is scalable (just change the FETS). For currents above 30 A a multiphase approach must be used with two or more switching outputs that contribute to share the load current on a single output. This is different than a multi-output regulator where the switching outputs feed different loads.