Method and system for converting a dc voltage

A system, comprising:

• a comparator for comparing an output voltage to a reference voltage and outputting comparison signals in response to the comparing;
• a controller coupled to the comparator for outputting control signals and mode signals in response to the comparison signals;
• and
• circuitry coupled to the controller and to the comparator for receiving the control signals and generating the output voltage in response thereto;
• wherein the comparator is for:
• increasing a speed of the comparing in response to the mode signals indicating that the circuitry is increasing the output voltage;
• and reducing the speed in response to the mode signals indicating that the circuitry is reducing the output voltage;
• wherein the comparator includes a first switch for:
• increasing the speed by enabling a path to conduct current;
• and reducing the speed by disabling the path against conducting current;
• and
• wherein the comparator includes a second switch for:
• while the path is enabled by the first switch, connecting at least one switched voltage to vary an amount of the current conducted through the path, wherein the switched voltage is at least one of the reference voltage and the output voltage;
• and, while the path is disabled by the first switch, disconnecting the switched voltage from varying the amount.

A system, comprising:

• a comparator for comparing an output voltage to a reference voltage and outputting comparison signals in response to the comparing;
• a controller coupled to the comparator for outputting control signals and mode signals in response to the comparison signals;
• and
• circuitry coupled to the controller and to the comparator for receiving the control signals and generating the output voltage in response thereto;
• wherein the controller is for outputting the control signals for causing the circuitry to generate the output voltage approximately equal to the reference voltage;
• wherein the comparator is for:
• increasing a speed of the comparing in response to the mode signals indicating that the circuitry is increasing the output voltage;
• and reducing the speed in response to the mode signals indicating that the circuitry is reducing the output voltage;
• wherein the circuitry is for:
• charging an inductor for increasing the output voltage in response to the control signals;
• and discharging the inductor in response to the control signals, wherein a speed of increasing the output voltage is faster than a speed of reducing the output voltage;
• wherein the comparator includes a first switch for:
• increasing the speed by enabling a path to conduct current;
• and reducing the speed by disabling the path against conducting current;
• and
• wherein the comparator includes a second switch for:
• while the path is enabled by the first switch, connecting at least one switched voltage to vary an amount of the current conducted through the path, wherein the switched voltage is at least one of the reference voltage and the output voltage;
• and, while the path is disabled by the first switch, disconnecting the switched voltage from varying the amount.