An integrated digital controller for DC-DC switching converter with dual-band switching

A 0.6 /spl mu/m CMOS integrated digital PID controller for a buck converter is presented. It consists of: (1) a VCO driving a counter to serve as an ADC; (2) a PID compensator that employs variable integration times for enhancing accuracy and stability, and (3) a dual-band switching PWM generator with a modified tapped delay line for better output resolution and area efficiency. The converter switches at 1 MHz, while the tracking time is 50 /spl mu/s for a step change of 1 V.