For a reduced approved parts list, the LM21305 5 A synchronous buck converter is beneficial as it can be used with intermediate bus voltages, from 3 V to 18 V. The LM21305 comes in a 5 x 5 mm QFN package and its current mode control allows one loop compensation scheme for various input to output voltage conversion rations. Reference designs are available including a POLA plug-in module. POLA is founded on the fundamental that every POLA member, three are required to call a part POLA, builds a product to the same schematic. The founding principles of POLA are to give the customer the same mechanics, footprint and functionality, plus provide modules that are completely interoperable. For example, they will function the same in all static and dynamic operating conditions. These principles support customers' continual requests for power modules that work the same in their circuit design, regardless of the supplier.