Single-inductor power converter with buck-boost capability

A power converter comprising:

• an inductor;
• a first switch including a control terminal, a first terminal connected to a reference potential and a second terminal connected to one terminal of the inductor;
• a second switch including a control terminal, a first terminal connected to another terminal of the inductor and a second terminal connected to a reference potential;
• a summing module generating a voltage sum based on a ramp voltage and a first voltage based on a sensed inductor current;
• a plurality of error amplifier modules generating error voltages;
• a comparing and control signal generating module to generate first and second switching signals and skip signals based on the error voltages and the voltage sum;
• and
• a state machine module connected to the control terminals of the first switch and the second switch to switch the first switch and the second switch based on the first switching signal, the second switching signal and the skip signals,
• wherein the state machine module, during a single clock period, operates in one of a two phase mode with a TON phase during which the inductor is charged and one TOFF phase during which one of a first load and a second load is fed and a three phase mode with the TON phase and two TOFF phases during which both the first load and the second load are sequentially fed.