A CMOS monolithic 5-MHz, 5-V, 250-mA, 56% efficiency DC/DC switch-mode boost converter with dynamic PWM for embedded power management

Results of a 5 MHz, 5 V, 250 mA monolithic CMOS DC/DC boost converter are presented. It utilizes a dynamic PWM control of the duty cycle to respond to rapid load transients. The converter achieved a power conversion efficiency of 56% and an output ripple under 6% when supplying 100 mA DC load current. The Q of the monolithic inductor was under 1 at the 5 MHz switching rate, suggesting that much higher efficiencies will result from low-resistance magnetic components. The circuit was implemented in 0.5 /spl mu/m CMOS in a die area less than 1.5/spl times/1.5 mm/sup 2/.