A High-Efficiency Fast-Transient-Response Buck Converter with Analog-Voltage-Dynamic-Estimation Techniques

A fast-transient-response buck converter utilizing analog-voltage-dynamic-estimation (AVDE) techniques is proposed in this paper. The responses of the proposed buck converter are very fast when load changes between heavy load and light load. The switching frequency of the proposed buck converter is 1 MHz for nominal 3.3 V input and 1.0-2.5 V output range application. Experimental results prove that the proposed scheme improves the transient response to within 2 μs and that its maximum power efficiency can be up to 95%. The maximum load current is 300 mA. The proposed AVDE buck converter has been fabricated with a commercial 0.35 μm CMOS 2P4M process, the total chip area is about 1.5 mm × 1.5 mm, including PADs.