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Cascode regulator with plural outputs

  • US 6,566,846 B1
  • Filed: 04/29/2002
  • Issued: 05/20/2003
  • Est. Priority Date: 11/10/2000
  • Status: Active Grant
First Claim
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1. A cascode circuit for generating a regulated voltage from a supply voltage, comprising:

  • at least first and second regulator circuits being coupled in a cascode configuration for generating a regulated voltage, each regulator circuit including;

    a driver for generating a drive signal;

    a charge pump having a first voltage input coupled to a first voltage source, being responsive to the drive signal, to provide a pump voltage that is boosted from a voltage level of the first voltage source;

    a voltage buffer coupled between a supply voltage source and the charge pump for generating an output voltage corresponding to the pump voltage;

    an amplifier having a reference input coupled to a reference voltage, a sense input coupled to a sense signal representative of the pump voltage, and an output, operable in response to a difference between the reference voltage and the sense signal, to control the driver; and

    a switch being coupled from the amplifier output to an output of the charge pump such that the pump voltage is controllably boosted by the amplifier output through the switch.

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