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In one embodiment, a method of operating an implantable pulse generator comprises: providing power to a voltage converter at a first voltage level; outputting a second voltage level by the voltage converter, the second voltage level being a variable voltage level that is controlled by a control sign

In one embodiment, a method of operating an implantable pulse generator comprises: providing power to a voltage converter at a first voltage level; outputting a second voltage level by the voltage converter, the second voltage level being a variable voltage level that is controlled by a control signal provided to the voltage converter, the second voltage level being provided to pulse generating circuitry of the implantable pulse generator, the second voltage level being selectable from a plurality of voltages including non-integer multiples of the first voltage level; generating pulses by the pulse generating circuitry, the pulse generating circuitry including current control circuitry for controlling the pulses to cause the pulses to provide substantially constant current to tissue of the patient; and applying at least two different control signals to the voltage converter during individual pulses to provide successively increasing voltages to the pulse generating circuitry during a respective pulse.

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1. A method of operating an implantable pulse generator for stimulating tissue of a patient, comprising: providing power to a voltage converter of the implantable pulse generator at a first voltage level;outputting a second voltage level by the voltage converter, the second voltage level being a var

1. A method of operating an implantable pulse generator for stimulating tissue of a patient, comprising: providing power to a voltage converter of the implantable pulse generator at a first voltage level;outputting a second voltage level by the voltage converter, the second voltage level being a variable voltage level that is controlled by a control signal provided to the voltage converter, the second voltage level being provided to pulse generating circuitry of the implantable pulse generator, the second voltage level being selectable from a plurality of voltages including non-integer multiples of the first voltage level;generating pulses by the pulse generating circuitry, the pulse generating circuitry including current control circuitry for controlling the pulses to cause the pulses to provide constant current to tissue of the patient; andapplying at least two different control signals to the voltage converter during individual pulses to provide successively increasing voltages to the pulse generating circuitry during a respective pulse of constant current. 2. The method of claim 1 wherein the pulses are pulses that stimulate tissue of a patient. 3. The method of claim 1 wherein the pulses are pulses that discharge current stored on capacitors of the implantable pulse generator between stimulation pulses. 4. The method of claim 1 wherein the control signals are selected to provide a minimum voltage from a plurality of available voltages from the voltage converter that is necessary to provide the constant current during a respective segment of an individual pulse. 5. The method of claim 1 wherein the applying further comprises: monitoring the pulse generating circuitry; andchanging the control signal provided to the voltage converter in response to the monitoring. 6. The method of claim 5 wherein the circuitry for monitoring signals control circuitry to change the control signal provided to the voltage converter immediately before the pulse generating circuitry is unable to provide the constant current at a current voltage level. 7. The method of claim 1 wherein the applying comprises: changing the control signal provided to the voltage converter in response to a table of values stored in the implantable pulse generator, wherein each value in the table defines a voltage level for a specific partition of a plurality of partitions for a pulse at a respective amplitude level. 8. The method of claim 1 wherein the applying is controlled by a microprocessor or microcontroller. 9. The method of claim 1 wherein the applying is controlled by a control circuit without continuous control by a microprocessor or microcontroller. 10. The method of claim 1 wherein the applying provides control signals to a multiplexer that selects from a plurality of voltage levels provided by the voltage converter. 11. An implantable pulse generator for stimulating tissue of a patient, comprising: a battery for powering the implantable pulse generator;a voltage converter for providing a variable voltage level in response to a control signal, wherein the variable voltage level is selectable from a plurality of voltages including non-integer multiples of a supplied voltage level;pulse generating circuitry for generating pulses, the pulse generating circuitry receiving a voltage output from the voltage converter, the pulse generating circuitry including current control circuitry for controlling the pulses to cause the pulses to provide constant current to tissue of the patient; anda controller for controlling the voltage converter during operation of the pulse generating circuitry, wherein the controller causes at least two different control signals to be applied to the voltage converter during individual pulses to provide successively increasing voltages to the pulse generating circuitry during a respective pulse of constant current. 12. The implantable pulse generator of claim 11 wherein the controller comprises at least one item selected from the list consisting of a microcontroller, a microprocessor, and a control circuit. 13. The implantable pulse generator of claim 11 wherein the controller applies the at least two different control signals during generation of stimulation pulses. 14. The implantable pulse generator of claim 11 wherein the controller applies the at least two different control signals during generation of active discharge pulses. 15. The implantable pulse generator of claim 11 wherein the at least two different control signals are selected to provide a minimum voltage from a plurality of available voltages from the voltage converter that is necessary to provide the constant current during a respective segment of an individual pulse. 16. The implantable pulse generator of claim 11 wherein the controller comprises circuitry for monitoring a current level provided by the pulse generating circuitry. 17. The implantable pulse generator of claim 16 wherein the controller further comprises a comparator for comparing a voltage output from the voltage converter to a voltage output from the pulse generating circuitry. 18. The implantable pulse generator of claim 17 wherein the controller changes a control signal applied to the voltage converter when a voltage output from the voltage converter exceeds a voltage output from the pulse generating circuitry by a predetermined amount. 19. The implantable pulse generator of claim 11 further comprises: a table of values stored in memory the implantable pulse generator, wherein each value in the table defines a voltage level for a specific partition of a plurality of partitions for a pulse at a respective amplitude level. 20. The implantable pulse generator of claim 11 wherein the voltage converter comprises a multiplexer that selects from a plurality of voltage levels provided by the voltage converter.