Dc-dc converter control circuit

A DC-DC converter circuit, comprising:

• an error amplifier configured to generate an error signal;
• a comparator;
• an oscillator;
• and
• a control circuit coupled to the error amplifier, the comparator and the oscillator, and configured to:
• generate an oscillator control signal to control a frequency of the oscillator based on the error signal;
• generate a peak control signal provided to the comparator based on the error signal;
• switch, based on the error signal, between a first modulation mode and a second modulation mode during a transition mode;
• and
• in the transition mode:
• generate the oscillator control signal based on the peak control signal and the error signal.

A mobile device, comprising:

• a DC-DC converter, including:
• an error amplifier coupled to an output of the DC-DC converter, and configured to generate an error signal;
• a comparator configured to control switching of a power transistor;
• an oscillator configured to control switching of the power transistor;
• a control circuit coupled to the error amplifier, the comparator and the oscillator, and configured to:
• generate an oscillator control signal to control a frequency of the oscillator based on the error signal;
• generate a peak control signal provided to the comparator based on the error signal;
• switch, based on the error signal, between a first modulation mode and a second modulation mode during a transition mode;
• and
• in the transition mode:
• generate the oscillator control signal based on the peak control signal and the error signal.