A 25-mV input boost converter with 91% MPPT efficiency for energy harvesting application

Abstract

In this letter, a low input boost converter with continuous conduction mode is presented for energy harvesting application. The maximum power point tracking (MPPT) efficiency at low input voltage is improved by using the proposed input-ripple control technique. Fabricated in a 0.35 µm CMOS process, the boost converter generates an output voltage of 3 V from the input voltage as low as 25 mV. The measurement results show that the boost converter achieves an MPPT efficiency of 91% at 25-mV input and a peak power conversion efficiency of 82.7% at 250-mV input.