Extra-cardiovascular cardiac pacing system for delivering composite pacing pulses

A method comprising:

• generating by therapy circuitry of a medical device a composite pacing pulse comprising a series of at least two individual pulses by:
• generating a first pulse of the at least two individual pulses by selectively coupling a first portion of a plurality of capacitors to an output signal line, the first pulse having a first peak voltage amplitude, and
• generating a second pulse of the at least two individual pulses sequentially with the first pulse by selectively coupling a second portion of the plurality of capacitors to the output signal line, the second pulse of the at least two individual pulses having a second peak voltage amplitude different than the first peak voltage amplitude.

A non-transitory, computer-readable storage medium comprising a set of instructions which, when executed by control circuitry of a medical device, cause the medical device to:

• generate a composite pacing pulse comprising a series of at least two individual pulses by:
• generating a first pulse of the at least two individual pulses by selectively coupling a first portion of a plurality of capacitors to an output signal line, the first pulse having a first peak voltage amplitude, and
• generating a second pulse of the at least two individual pulses sequentially with the first pulse by selectively coupling a second portion of the plurality of capacitors to the output signal line, the second pulse of the at least two individual pulses having a second peak voltage amplitude different than the first peak voltage amplitude.