Compensator-Free Mixed-Ripple Adaptive On-Time Controlled Boost Converter

A mixed-ripple adaptive on-time controlled boost converter is proposed. With the proposed control method, the compensator network is no longer required. Hence, the chip area and cost can be reduced, and a satisfied load regulation still can be achieved. Besides, a novel on-time generator is proposed to fix the switching frequency in continuous conduction mode (CCM). Moreover, a differential difference comparator is proposed to simplify the circuits and further reduce chip area. Furthermore, with the proposed control, the converter is capable of smoothly switching between discontinuous conduction mode and CCM, depending on the loading condition. The proposed boost converter was implemented by using a 0.18-μm 1P6M mixed-signal process, and the chip area is 0.88 mm2. The input voltage may range from 0.8 to 1.4 V, the output voltage is set to 1.8 V, and the measured peak efficiency is 92.4%.