DC/DC buck (step-down) converters and boost (step-up) converters address a unidirectional voltage conversion by regulating a voltage less than or more than the input supply. The question of how to regulate a voltage accurately using bidirectional conversion, if the input supply varies above, below or equal to the output voltage, has been answered by the Buck-Boost DC/DC Regulator. The Buck-Boost Regulator performs three functions autonomously: 1) steps down VIN when VOUT is less than VIN, 2) keeps output regulated when VIN equals VOUT, and 3) steps up VIN when it is less than VOUT. For example, consider a battery that, when fully charged, has a voltage of 12V and when used and almost drained its voltage gradually decreases to 8V. If one wants a 10V regulated power supply for a DVD player from this battery, a Buck-Boost DC/DC Regulator topology will accomplish this task by bucking the charged battery from 12V to 10V and boosting the drained battery from 8V to 10V. When the battery is charged, its voltage rises to 12V again. Automotive, avionics, motor control, and marine power systems are examples of markets using a buck-boost regulator.