Abstract: A power converter system includes a controller that provides first and second bistate control signals having mutually exclusive true logic states. Also included is a tri-state interface circuit having a switching stage that generates a tri-state output, wherein true and false logic states correspond to the mutually exclusive true logic states and a high impedance state corresponds to concurrent false logic states of the first and second bistate control signals. The tri-state interface circuit also has a level setting stage that controls a voltage level of the tri-state output during the high impedance state. The power converter system further includes a driver that converts the voltage level of the tri-state output to power stage control signals and a power stage that converts an input voltage to an output voltage based on the power stage control signals. A method of operating a tri-state interface circuit is also provided.