An area- and power-efficient monolithic Buck converter with fast transient response

A voltage-mode Buck converter with a novel pseudo-type III compensation is presented. It maintains the fast load transient response, as confirmed by the measured loop gain, and 7 mus settling time for 500 mA load current step. It also transforms the type III compensator into a summation of an area- and power-efficient error amplifier plus a low-power band-pass filter. Consequently, the area and power consumption of proposed compensator is reduced by 80% and 85%.