Devices and methods related to dual output charge pump

Abstract

Devices and methods related to dual output charge pumps. According to some implementation, a charge pump includes a boost charge pump circuit and a buck charge pump circuit sharing a common flying capacitance. In some implementations, the boost pump circuit includes an input node and a boosted-voltage output node, and the buck charge pump circuit includes the input node and a divided-voltage output node. In some implementations, the boosted-voltage includes 2×Vin, and the divided-voltage includes Vin/2, Vin being an input voltage at the input node. In some implementations, the boost pump circuit further includes a first holding capacitance that couples the boosted-voltage output node to a ground. In some implementations, the buck pump circuit further includes a second holding capacitance that couples the divided-voltage output node to the ground.

What is claimed is: 
     
         1 . A method of operating a charge pump, comprising:
 providing a charge pump including a boost charge pump circuit including an input node and a boosted-voltage output node, and a buck charge pump circuit including the input node and a divided-voltage output node, the boost charge pump circuit and the buck charge pump circuit sharing a common flying capacitance; and   generating an output voltage.