Patent ID: 9667239
Date: 2017-05-30
CPC Classifications: G05F,G11C,H03K

Claim:
1. A voltage regulator comprising: a high duty cycle detector configured to generate a high duty cycle signal based on a power supply voltage and a reference voltage; a feedback controller configured to generate a first feedback voltage and a second feedback voltage based on the reference voltage, the high duty cycle signal, an output voltage of the voltage regulator and a first voltage; a hysteretic comparator configured to compare the reference voltage and the first feedback voltage to generate a control signal; a first driver configured to drive a node that provides the first voltage with the power supply voltage or a ground voltage based on the control signal and the high duty cycle signal, when the first feedback voltage is activated; a low pass filter configured to filter the first voltage to generate a second voltage and configured to drive an output node that provides the output voltage with the second voltage; and a second driver configured to generate a third voltage proportional to the reference voltage based on the power supply voltage and the second feedback voltage and configured to drive the output node with the third voltage, when the second feedback voltage is activated.