Multiple output charge pump
AssigneeMicrosemi Corporation
InventorGeorge C. Henry
Life of this patent
Estimating the term…
Abstract
A single mode buck/boost charge pump has multiple outputs and is adapted to power a plurality of separate loads, such as light emitting diodes, in a highly efficient manner. The multiple outputs have different voltages. The output current or voltage of at least one of the multiple outputs is regulated by a feedback circuit. The feedback circuit provides a control signal based on a comparison of a reference voltage with a feedback voltage. The feedback voltage is proportional to an output voltage when the charge pump is configured to regulate the output voltage. Alternately, the feedback voltage is a sense voltage across a sense resistor connected in series with a load when the charge pump is configured to regulate output current provided to the load.
Claims10
A multiple output regulating charge pump that receives a supply voltage and that generates a first output voltage and a second output voltage, the charge pump comprising:
- a charge storage component;
- a plurality of switches that selectively interconnect the charge storage component and the supply voltage and that selectively interconnect the charge storage component to an output terminal that provides one of the first output voltage and the second output voltage;
- a switch timing control circuit that selectively controls the conductivities of the plurality of switches;
- a reference voltage;
- a feedback voltage responsive to one of said first output voltage and said second output voltage;
- and
- a feedback circuit responsive to a difference between the reference voltage and the feedback voltage to control a charging current to the charge storage component when the charge storage component is connected to the supply voltage.
Dependencies are inferred from the claim text.