A high-efficient fast-transient boost converter with adaptive on-time controlled and zero-current-detection techniques

摘要

A high-efficient fast-transient boost converter with adaptive on-time controlled and zero-current-detection techniques is presented in this paper. The adaptive on-time controlled technique can rapidly reach desired output voltage in two to three switching cycles. The proposed boost converter uses a zero-current-detector to detect and prevent the negative inductor current issue that can decrease the light-load power consumption and increase the light-load efficiency. Therefore, this new configuration accelerates transient response and improves light-load efficiency of the boost converter. The proposed boost converter has been fabricated with Taiwan Semiconductor Manufacturing Company (TSMC) 0.18-mu m Complementary Metal-Oxide-Semiconductor (CMOS) 1P6M technology, and the chip area is only 1.148 x 1.187 mm (including personal assistant devices [PADs]). The input voltage range is from 0.5 to 1 V, and the output voltage is 1.8 V. The measured transient response time is about 2 and 3 mu s, when the load current is changed from 5 to 300 mA and from 300 to 5 mA, respectively. The converter's operating frequency is 1 MHz, the maximum output current is 300 mA, and the peak power efficiency is 91.6% under 200-mA load current. The experimental results confirm that the light-load efficiency of the converter can be increased 11%.