Adaptive voltage regulator

摘要

A voltage regulator circuit includes: a comparator configured to have a first input coupled to an output voltage of the voltage regulator circuit; a second input coupled to a reference voltage and an output signal; a first transistor; a second transistor, a drain of the first transistor connected to a drain of the second transistor; an inductor connected to the drain of the first transistor and the drain of the second transistor; a capacitor and a resistor connected in parallel, between the output node and a source of the second transistor; a peak-current detector unit configured to detect peak current in the inductor; a zero-crossing detector unit configured to detect a zero-crossing current in the inductor; and a control unit configured to receive a plurality of input signals including at least an input voltage and a clock signal.

主权项

1. A voltage regulator circuit comprising:
a first comparator having a first input, a second input, and an output, wherein the first input is connected to an output node of the voltage regulator circuit, and the second input is connected to a reference node having a reference voltage; a first transistor and a second transistor, wherein a drain of the first transistor is connected to a drain of the second transistor; an inductor coupled between the drain of the first transistor and the output node; a first capacitor and a resistor connected in parallel between the output node and a source of the second transistor; a peak-current detector configured to detect peak current through the inductor; a zero-crossing detector configured to detect zero-crossing current through the inductor; and a control unit configured to receive a plurality of input signals including an input voltage, a clock signal, and the output of the first comparator to adaptively control the voltage regulator circuit, wherein the control unit is configured to:
determine a duty ratio based on a voltage on the output node of the voltage regulator circuit and the input voltage of the control unit;compute a number of clock cycles of a turn-on time duration for the first transistor based on the duty ratio; andcount the number of clock cycles of the turn on time duration to output a signal representing the turn-on time duration.