Implantable medical device having power supply for generating a regulated power supply

A regulated power supply to generate multiple output voltages based on an input voltage from a power source having a finite supply, comprising:

• a plurality of capacitors dynamically configurable in at least a first mode and a second mode, each of the first and second modes having a plurality of stacked configurations and operable to generate the multiple output voltages based on the input voltage;
• a switch array having a plurality of switches coupled to the plurality of capacitors and operable in a number of different states to couple the capacitors to establish the plurality of stacked configurations, wherein at least one of the output voltages generated by the plurality of capacitors has a first supply ratio that is different from a second supply ratio of a second of the output voltages;
• and
• a switch controller operable to issue a control signal to the switch array to control the coupling of the plurality of capacitors in a selected one of the plurality of configurations based on predefined criteria.