A small, low power boost regulator optimized for energy harvesting applications


A small, low power bootstrapped boost regulator is introduced that can start up with an input voltage of 240 mV and achieve a maximum efficiency of 97 %. The proposed circuit uses two separate control schemes for startup and steady-state operation. A fixed-frequency oscillator is used to initially start up the circuit and raise the output voltage. Once the output voltage has reached a level adequate to bias the internal circuitry, a constant-on-time style hysteretic control scheme is used, which helps increase system efficiency compared to using a conventional pulse-width-modulated control scheme. While maintaining a high efficiency, the proposed circuit only requires three external components: two capacitors (input and output) and an inductor. The effectiveness of this approach is shown through Spectre simulation results.

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Correspondence to Zachary Nosker.

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Nosker, Z., Kobori, Y., Kobayashi, H. et al. A small, low power boost regulator optimized for energy harvesting applications. Analog Integr Circ Sig Process 75, 207–216 (2013). https://doi.org/10.1007/s10470-012-0017-3

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  • Energy harvesting
  • Boost regulator
  • CMOS
  • Hysteretic control