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Apparatus and methods for multi-mode charge pumps

  • US 10,483,843 B2
  • Filed: 07/11/2017
  • Issued: 11/19/2019
  • Est. Priority Date: 08/04/2014
  • Status: Active Grant
First Claim
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1. A multi-mode charge pump comprising:

  • a charge pump output terminal configured to provide a charge pump output voltage that is less than a reference voltage;

    a mode control circuit configured to operate the multi-mode charge pump in a selected mode chosen from a plurality of modes including a first mode and a second mode;

    a first switched capacitor;

    a charge pump filter electrically connected to the charge pump output terminal and having a filter resistance that changes based on the selected mode;

    a capacitor charging circuit configured to connect a first end of the first switched capacitor to a charging voltage in a first phase of a clock signal, and to connect the first end of the first switched capacitor to the reference voltage in a second phase of the clock signal, the capacitor charging circuit including a plurality of supply selection switches configured to control the charging voltage with a first supply voltage in the first mode and with a second supply voltage in the second mode; and

    a plurality of switches configured to connect a second end of the first switched capacitor to the reference voltage in the first phase, and to connect the second end of the first switched capacitor to the charge pump output terminal in the second phase.

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