Patent ID: 8436681

Claim:
A voltage regulation circuit comprising: a pulse width modulation (PWM) controller; a current sense circuit comprising an inductor and a capacitor connected to the inductor in parallel, wherein two terminals of the inductor are respectively connected to a phase pin of the PWM controller and an output voltage terminal; a voltage feedback circuit comprising a first resistor and a second resistor connected to the first resistor in series between the output voltage terminal and ground, wherein a node between the first and second resistors is connected to a feedback pin of the PWM controller; and a gain-and-bias circuit comprising an operational amplifier and third to seventh resistors, wherein a first terminal of the capacitor is connected to an inverting input terminal of the operational amplifier through the third resistor, a second terminal of the capacitor is connected to a non-inverting input terminal of the operational amplifier through the fourth resistor, the inverting input terminal of the operational amplifier is connected to an output terminal of the operational amplifier through the fifth resistor, the non-inverting input terminal of the operational amplifier is grounded through the sixth resistor, the output terminal of the operational amplifier is connected to the node between the first and second resistors through the seventh resistor.