A voltage-mode DC-DC buck converter with fast output voltage-tracking speed and wide output voltage range

A high switching frequency voltage-mode buck converter with fast voltage-tracking speed and wide output voltage range has been proposed. A novel error amplifier (EA) is presented to achieve a high DC gain and get high phase margin, including a resistor and capacitor net, a unit gain block and a high gain block. The investigated converter has been fabricated with GF 0.35 mu m CMOS process and can operate at 6 MHz with the output voltage range from 0.6 to 3.4 V. The experimental results show that the voltage-tracking speed can achieve 8.8 mu s/V for up-tracking and 6 mu s/V for down-tracking. Besides, the recovery time is less than 8 mu s while the load current suddenly changes 400 mA.