A boost converter , comprising: a power stage circuit configured to generate an output voltage (V out ) in response to a trigger signal; a comparator circuit , including a first input port and a second input port, the comparator circuit configured to compare a voltage applied to the first input port and the voltage applied to the second input port to generate said trigger signal by an output port; a reference voltage source configured to provide a reference voltage (V ref ); a feedback circuit comprising a feedback divider configured to generate a feedback voltage signal (V FB ) proportional to said output voltage (V out ); an off-time timer configured to provide a voltage signal to form an off-time sawtooth voltage wave; an on-time timer configured to provide a voltage signal to form an on-time sawtooth voltage wave; a voltage loop circuit comprising said comparator circuit , the voltage loop circuit configured to couple the off-time sawtooth voltage and the reference voltage (V ref ) to the first input port of the comparator circuit , and to couple the feedback voltage (V FB ) and the on-time sawtooth voltage to the second input port of the comparator circuit ; wherein the on-time sawtooth voltage and the off-time sawtooth voltage are active alternately; and wherein the slopes of the off-time sawtooth voltage and the on-time sawtooth voltage are proportional to the output voltage, the maximum value of the on-time sawtooth voltage is equal to the difference between the output voltage and an input voltage of the boost converter , and the maximum value of the off-time sawtooth voltage is equal to the input voltage, such that a combination of the off-time sawtooth voltage waveform and the on-time sawtooth voltage waveform provides a synthetic ripple voltage. a power stage circuit configured to generate an output voltage (V out ) in response to a trigger signal; a comparator circuit , including a first input port and a second input port, the comparator circuit configured to compare a voltage applied to the first input port and the voltage applied to the second input port to generate said trigger signal by an output port; a reference voltage source configured to provide a reference voltage (V ref ); a feedback circuit comprising a feedback divider configured to generate a feedback voltage signal (V FB ) proportional to said output voltage (V out ); an off-time timer configured to provide a voltage signal to form an off-time sawtooth voltage wave; an on-time timer configured to provide a voltage signal to form an on-time sawtooth voltage wave; a voltage loop circuit comprising said comparator circuit , the voltage loop circuit configured to couple the off-time sawtooth voltage and the reference voltage (V ref ) to the first input port of the comparator circuit , and to couple the feedback voltage (V FB ) and the on-time sawtooth voltage to the second input port of the comparator circuit ; wherein the on-time sawtooth voltage and the off-time sawtooth voltage are active alternately; and wherein the slopes of the off-time sawtooth voltage and the on-time sawtooth voltage are proportional to the output voltage, the maximum value of the on-time sawtooth voltage is equal to the difference between the output voltage and an input voltage of the boost converter , and the maximum value of the off-time sawtooth voltage is equal to the input voltage, such that a combination of the off-time sawtooth voltage waveform and the on-time sawtooth voltage waveform provides a synthetic ripple voltage. <EOS>