High efficiency DC-DC converter with fast clock operation and load change response

摘要

The DC-DC converter includes a reference voltage generating circuit that generates a reference voltage. The DC-DC converter includes a modulation clock signal generating circuit that generates a modulation clock signal. The DC-DC converter includes a modulator that performs modulation of the reference voltage in synchronization with the modulation clock signal and outputs a resulting reference signal. The DC-DC converter includes a first comparator that compares the reference signal and a first feedback signal, which is based on the output voltage, and outputs a signal based on a result of the comparison. The DC-DC converter includes a driver that shapes a waveform of a PWM signal, which is based on the signal output from the first comparator, and outputs the PWM signal with the shaped waveform to the control node.

主权项

1. A DC-DC converter comprising:
an output voltage terminal at which an output voltage is output, the output voltage terminal being connected to an external load, and the external load being connected between the output voltage terminal and a fixed potential; a capacitor connected between the output voltage terminal and the fixed potential; an inductor connected to the output voltage terminal at a first end thereof and to a control node at a second end thereof; a reference voltage generating circuit that generates a reference voltage; a modulation clock signal generating circuit that generates a modulation clock signal; a modulator that performs modulation of the reference voltage in synchronization with the modulation clock signal and outputs a resulting reference signal; a first comparator that compares the resulting reference signal and a first feedback signal, which is based on the output voltage, and outputs a signal based on a result of the comparison; and a driver that shapes a waveform of a PWM signal, which is based on the signal output from the first comparator, and outputs the PWM signal with a shaped waveform to the control node.