Operating phase number dependent compensation of a multi-phase buck converter

A multi-phase buck converter with operating phase number dependent compensation, comprising:

• an error amplifier connected to an output of the multi-phase buck converter for detecting an output voltage of the multi-phase buck converter to generate an analog error signal;
• an analog-to-digital converter connected to the error amplifier for converting the analog error signal into a digital error signal;
• a digital compensator connected to the analog-to-digital converter for compensating the digital error signal depending on an operating phase number of the multi-phase buck converter;
• a DPWM circuit connected to the digital compensator for providing a plurality of PWM signals according to the compensated digital error signal;
• and
• a plurality of phase circuits connected in parallel between the output of the multi-phase buck converter and DPWM circuit for converting an input voltage to the output voltage, each of the plurality of phase circuits being selected by the DPWM circuit to be driven by a respective one of the plurality of PWM signals.