The design of internal load independent compensation for current-mode DC-DC converters

A monolithic current-mode DC-DC buck converter with internal load independent compensation is presented in this paper. The proposed compact structure overcomes the drawback of traditional stability dependency on load resistance and the ceramic output capacitor´s ESR, which reduces the complexity of the design and saves the PCB space. The DC-DC converter has been fabricated with a standard 0.5 mum CMOS process. Internal compensation technique provides high loop stability, both load and line regulations are less than plusmn0.4%. And the output voltage can recover within 8 mus for 400 mA load step. High efficiency up to 96% is achieved through internal synchronous rectification.