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Single charge-pump buck-boost for providing independent voltages

  • US 8,618,868 B2
  • Filed: 08/31/2011
  • Issued: 12/31/2013
  • Est. Priority Date: 08/17/2011
  • Status: Active Grant
First Claim
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1. A charge pump for providing independent voltages, comprising:

  • a first output;

    a second output;

    at least one capacitor;

    a plurality of switches; and

    a switch controller adapted to generate control signals for the plurality of switches to selectively couple the at least one capacitor between a high voltage node and a low voltage node during charging phases, and to selectively couple the at least one capacitor to the first output and the second output during discharging phases that output a first voltage pulse from the first output and a second voltage pulse from the second output such that the first voltage pulse and the second voltage pulse are asymmetrical and coincidental, and wherein the first voltage pulse and the second voltage pulse each reach a voltage level that is about twice the voltage level between the high voltage node and the low voltage node.

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