Variable frequency modulation scheme based on current-sensing techniques for switched-capacitor DC-DC converters

An apparatus for converting an input voltage at an input to an output voltage at an output, the apparatus comprising:

• a capacitor, wherein the capacitor is configured such that a charging and discharging of the capacitor transfers energy from the input to the output;
• switches configured to control the charging and discharging of the capacitor;
• a controller that controls a switching frequency of the switches based on a current associated with the transfer of energy from the input to the output;
• and
• a lookup table coupled to the controller, wherein the controller is configured to set the switching frequency based on the current using one or more entries in the lookup table,
• wherein the lookup table stores a plurality of different switching frequency values for a same given current value, and wherein the controller is configured to select a certain at least one of the plurality of different switching frequency values based on the current, and wherein the plurality of different switching frequency values for the same given current value correspond to a plurality of different performance metric values associated with the transfer of energy from the input to the output.