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Programmable low dropout regulators with fast transient response when programming output voltage

  • US 10,642,296 B2
  • Filed: 04/19/2019
  • Issued: 05/05/2020
  • Est. Priority Date: 08/17/2015
  • Status: Active Grant
First Claim
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1. A mobile device comprising:

  • a transceiver configured to generate a radio frequency signal;

    a multi-stage power amplifier configured to amplify the radio frequency signal, the multi-stage power amplifier including a driver stage and an output stage; and

    a power management system including an envelope tracker configured to control a supply voltage of the output stage in relation to an envelope of the radio frequency signal, and a programmable low dropout regulator including an output configured to provide a programmable supply voltage to the driver stage, the programmable low dropout regulator including an output capacitor electrically connected to the output, a regulation transistor having a drain electrically connected to the output, and an alternative discharge circuit configured to activate an electrical path to discharge the output capacitor in response to programming the programmable supply voltage from a high voltage level to a low voltage level, the alternative discharge circuit including a comparator configured to activate the electrical path based on comparing the programmable supply voltage to a trigger voltage.

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