A Wide Dynamic Range Buck Converter With Sub-nW Quiescent Power

A buck converter in 65-nm CMOS is optimized for a low quiescent power of 240 pW. It operates with input 1.2–3.3 V and regulates the output from 0.7–0.9 V. Control circuits are designed for low leakage and static current, and scale in power over a hertz to megahertz frequency range, resulting in a wide load current dynamic range of <inline-formula> <tex-math notation="LaTeX">$2\times 10^{6}$ </tex-math></inline-formula>. With a 2-V input, the converter has a peak efficiency of 89% and delivers load currents of 500 pA to 1 mA with efficiency better than 50%. The peak efficiency is 92% for a 1.2-V input.

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