Digitally Controlled Buck-Boost Regulator

A digitally controlled regulator, comprising:

• a DC-DC converter circuit configured to receive an input voltage signal and generate an output voltage signal based on the input voltage signal and switching signals provided thereto;
• a controller configured to generate a pulse width modulation (PWM) control value in response to a value of the output voltage signal;
• a quantizer configured to receive the PWM control value and generate a first mapping for PWM control values outside a predetermined range of PWM control values, and generate a second, different mapping for PWM control values within the predetermined range, and configured to output a mapped PWM value in response thereto;
• and
• a digital pulse width modulator configured to generate switching signals based on the mapped PWM value, and provide the generated switching signals to the DC-DC converter circuit.

A method of controlling a digitally controlled regulator, comprising:

• generating a pulse width modulation (PWM) control value based on a feed back output voltage of the regulator;
• determining whether or not the PWM control value is within a predetermined range of values;
• mapping the PWM control value to a mapped PWM control value based on a first mapping function if the PWM control value is outside the predetermined range of values;
• mapping the PWM control value to a mapped PWM control value based on a second different mapping function if the PWM control value is within the predetermined range of values;
• and
• calculating a duty cycle and determining whether a buck mode of operation or a boost mode of operation based on the mapped PWM control value.