Multi-compliance voltage generator in a multichannel current stimulator

An improved power supply for implantable devices, the power supply comprising:

• a battery;
• a control circuit;
• a multiplicity of switched capacitors adapted to be electrically configurable in parallel between the battery and ground and electrically configurable in series between ground and a node Vout, wherein the configuration of the switched capacitors is controlled by the control circuit;
• a multiplicity of small capacitors in parallel;
• a multiplicity of switches (M4a–M4t) in parallel, each electrically connected individually between the node Vout and one of the small capacitors, wherein the switches (M4a–M4t) are controlled by the control circuit;
• a multiplicity of Vc nodes wherein the small capacitors are electrically connected between the Vc nodes and ground;
• and
• a multiplicity of switches (M5a–M5t), each electrically connected between a Vc node and one or more stimulation channels, wherein the switches (M5a–M5t) are adapted to selectably connect the Vc nodes to the one or more stimulation channels.

A method for providing multi-voltage power, comprising:

• providing a source voltage to a node Vs;
• disconnectably connecting a multiplicity of switched capacitors in parallel between the node Vs and ground;
• disconnectably connecting the switched capacitors in series between ground and a node Vout;
• and
• connecting a multiplicity of parallel sub-circuits between the node Vout and ground, wherein each parallel sub-circuit comprises a switch, a node Vc, and a small capacitor, wherein the small capacitor is electrically connected between the switch and ground, and the node Vc is between the switch and the capacitor.