High-efficiency fast-transient-response V2-controlled boost converter with small ESR capacitor

A high-efficiency fast-transient-response V²-controlled boost converter with a small equivalent series resistance (ESR) capacitor is presented. The proposed boost converter can achieve a fast and stable load transient response without relying on the ESR of the output capacitor. The switching frequency of the proposed boost converter is 500 kHz for a nominal 2.5-4.2 V input and a 3.3-5 V output application. Experimental results show that the transient recovery time inheriting the advantage of V² control is shorter than 6.4 μs with the load step from 250 to 20 mA and the highest efficiency can be up to 95.4%. The proposed boost converter has been fabricated with a 0.35 μm 2P4M CMOS process, the total chip area is about 1.5 ?? 1.5 mm², including the PADs.