An active device--similar to a switching power supply in its operation--that accepts a dc input and typically produces a different dc output voltage; sometimes the input and output are the same, in which case the converter is used for its noise isolation and/or regulation capabilities. Dc/dc converters are important for applications where electronic equipment must be operated from a battery or other dc source. Dc/dc converter modules typically offer full functionality, while dc/dc converter ICs usually require the addition of external components (like an inductor and capacitors) for complete operation.