A 300mA 14mV-ripple digitally controlled buck converter using frequency domain ΔΣ ADC and hybrid PWM generator

A 0.18 μm CMOS digitally controlled DC-DC buck converter is presented. An all-digital 8 b frequency-domain ΔΣ ADC is used for the feedback path, and a 9 b segmented digital PWM is used for power stage control. A regulated output voltage accuracy of 1% and maximum efficiency of 94% is achieved with less than 14 mVpp ripple and a settling time of 100 μs for a 300 mA load transient.