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

Abstract

Summary 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‐μm Complementary Metal‐Oxide‐Semiconductor (CMOS) 1P6M technology, and the chip area is only 1.148 × 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 μs, 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%.