Current controller and method therefor

A charge pump controller comprising:

• a switch matrix having a plurality of switch configuration modes, the switch matrix configured to receive an input voltage and form an output voltage that is a multiple of the input voltage and configured to supply the output voltage and a load current to a load;
• and
• a current controller configured to receive a sense signal that is representative of the load current and form a mode control signal to set an operating mode of the switch matrix responsively to a first value of the load current in order to regulate a value of the load current to a substantially constant value without regulating a value of the output voltage, the current controller including a first input device configured to receive a first reference current, a second input device operably coupled to receive a second reference current that is substantially equal to the first reference current and responsively control the first input device to form a reference voltage wherein the first input device includes a first transistor having a first current carrying electrode coupled to receive the first reference current, a second current carrying electrode coupled to provide the reference voltage, and a control electrode, and wherein the first input device includes a second transistor having a first current carrying electrode coupled to receive the second reference current, a second current carrying electrode coupled to receive the sense signal, and a control electrode coupled to the control electrode of the first transistor and to the first current carrying electrode of the second transistor.

A method of forming a current controller comprising:

• configuring the current controller to receive a sense signal that is representative of a load current wherein the sense signal has a first voltage and responsively regulate a value of the load current to a substantially constant value without regulating the first voltage to a substantially constant value;
• configuring the current controller to form first and second reference currents and control the load current to be proportional to one of the first reference current or second reference current;
• coupling a first transistor to receive the first reference current and form a reference voltage that follows the first voltage;
• and
• coupling a second transistor to receive the second reference current and receive the sense signal and control the first transistor to form the reference voltage.