Time-based converter apparatus and corresponding method

A time-based DC-DC converter circuit, comprising:

• a switching circuit controlled by a pulse width modulation switching signal generated in response to a first oscillator signal and a second oscillator signal;
• a first current controlled oscillator configured to generate the first oscillator signal based on a first control signal;
• a second current controlled oscillator configured to generate the second oscillator signal based on a second control signal;
• a controlled current generator configured to generate a controlled current based on a feedback control signal, wherein said first control signal and said second control signal are a function of said controlled current;
• and
• a negative feedback loop configured to receive the first oscillator signal from the first current controlled oscillator and the second oscillator signal from the second current controlled oscillator and to generate the feedback control signal as a function of said first oscillator signal and said second oscillator signal;
• said negative feedback loop comprising:
• detector circuitry configured to receive the first oscillator signal, the second oscillator signal, and a reference signal and generate at least two binary signals comprising a first binary signal based on a phase difference between the first oscillator signal and the reference signal and a second binary signal based on a phase difference between the second oscillator signal and the reference signal;
• and
• charge pump circuitry configured to receive the at least two binary signals and to generate the feedback control signal based on said at least two binary signals.