Dc-dc converter having a switch on-time control loop with a switched-capacitor circuit for error-based adjustment

A direct-current to direct-current (DC-DC) converter circuit, comprising:

• an output terminal between a first switch and a second switch;
• an output inductor having a first side and a second side, the first side of the output inductor coupled to the output terminal;
• an output capacitor having a first side and a second side, the first side of the output capacitor coupled to the second side of the output inductor, and the second side of the output capacitor coupled to a ground terminal;
• driver circuitry coupled to the first and second switches;
• pulse width modulation (PWM) logic coupled to the driver circuitry;
• a frequency-locked loop (FLL) having a switched-capacitor circuit, a first input terminal coupled to the first side of the output capacitor, a second input terminal coupled to a reference clock terminal, and a third input terminal coupled to an output of the PWM logic;
• and
• a comparator having an input coupled to an output of the FLL, a reference terminal coupled to an on-time signal circuit, and an output coupled to an input of the PWM logic.