Method of operating a DC/DC up/down converter

A DC/DC up-down converter, comprising:

• a DC voltage source configured to provide an input voltage;
• first and second outputs configured to output first and second respectively;
• an inductance having a first terminal, coupled to the DC voltage source, and a second terminal;
• a first output current switch coupled in series with the first output and configured to control a direction of the coil current into the first output or into the second output;
• a main switch connected between the second terminal of the inductance and the DC voltage source, and
• a controller configured to control the main and first output switches such that:
• the first output voltage lower than the input voltage;
• the second output voltage exceeds the input voltage;
• where the controller is configured to control:
• the first output switch so that during one switching cycle the coil current flows from the second terminal of the inductance into both outputs at least once:
• and
• the main switch in a transient state of the up-down converter so that an average voltage on the second terminal of the inductance is equal to a voltage on the first terminal of the inductances, which is equal to the input voltage.

A device, comprising:

• a first input configured to provide an input voltage;
• first and second outputs configured to output first and second output voltages, respectively;
• an inductance and configured to provide a coil current;
• a first input switch coupled to the inductance;
• a first output switch coupled in series with the first output and configured to control a direction of the coil current into the first output or into the second output;
• a controller configured to:
• control the first output switch such that, during one switching cycle, the coil current flows from a second terminal of the inductance into both outputs, and
• control the first input switch in a transient state so that an average voltage on the first terminal of the inductance is equal to a voltage on a second terminal of the inductance.