Methods, systems, and devices for a mechanical circulatory support system are disclosed herein. An implantable power supply can be part of a mechanical circulatory support system. The implantable power supply can include one or several energy storage components, a power source, a voltage converter, and an output bus. Power can be provided to the voltage converter from one or both of the power source and the first energy storage component. The voltage converter can convert the voltage of the power from a first voltage to a second voltage and can power the output bus.
