A Single-Inductor–Triple-Output Buck DC-DC Converter With Electromagnetic Gated Low Dropouts for Higher Resistance to Electromagnetic and Power Side-Channel Attacks With 3B Minimum Traces to Disclosure Improvement in Internet of Things Applications

The security protection of the Internet of Things urges the design of low electromagnetic interference (EMI) and small power signature in power chips. To achieve high security, small chip area, and high efficiency, this letter proposes a single-inductor–triple-output (SITO) buck dc–dc converter with electromagnetic (EM) gated low dropouts (LDOs) to reduce the EM-leaked signature. Experimental results show that the peak value of EMI noise can be reduced from 88.44 to 54.92 dB $\mu \text{V}$ , complying with EN 55032 Class B specifications. In addition, it can achieve 3 billion (B) minimum traces to disclosure (MTD) under power side-channel attack, which is at least three times improvement compared to prior-arts.