An Input-Independent Loop Type-III Buck Converter With PSRR Improvement and EMI Suppression for Enhancing the Security of Edge Devices
Chan-Ho Lee, Hyo-Jin Park, Joo-Mi Cho, Hyeon-Ji Choi, Su-Min Park, Esun Baik, Young-Ju Oh, Ho-Chan Ahn, Chan-Kyu Lee, Jeeyoung Shin, Se-Un Shin, Sung‐Wan Hong · IEEE Transactions on Power Electronics · 2022
This letter proposes an input-independent loop type-III buck converter (ILT3C) enhancing the security of edge devices. Compared to a conventional type-III buck converter, the ILT3C maximally improves power-supply rejection ratio as much as 34.1 dB to be robust against power injection attack. It also reduces the peak of electromagnetic interference as much as 35.8 dBμV to enhance the security from power side-channel attack. Furthermore, the external components such as an inductor and a capacitor of the converter should be integrated into a package to minimize its exposure to unknown hacking risks. Thus, the proposed converter operates with a high switching frequency (fsw) of 20 MHz and it can reduce the size of the external components enough to be placed in the package. The prototype converter was implemented in a 0.18-μm CMOS process. This ILT3C achieves the maximum efficiency of 90.7% and occupies an active area of 0.195 mm2.