Systems designers are having a difficult time developing power subsystems that supply all of their system’s power needs due to varied and changing power requirements. A new type of power subsystem—the field-programmable power subsystem or FPPS—squarely addresses this issue by providing a flexible approach that costs no more than conventional switching power subsystems. This white paper discusses the advantages and benefits of field-programmable power subsystems and discusses the many ways they reduce system-design risks.