Switched capacitor DC-DC converter with switch conductance modulation and Pesudo-fixed frequency control

Dennis Øland Larsen, Martin Vinter, Ivan Harald Holger Jørgensen

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A switched capacitor dc-dc converter with frequency-planned control is presented. By splitting the output stage switches in eight segments the output voltage can be regulated with a combination of switching frequency and switch conductance. This allows for switching at predetermined frequencies, 31.25 kHz, 250 kHz, 500 kHz, and 1 MHz, while maintaining regulation of the output voltage. The controller is implemented in 180 CMOS with a 1/3 series-parallel output stage designed for 3.6–4.2 V input, 1.2 V output, and 1–40 mA load current. The proposed controller is compared with a co-integrated pulse skipping controller and yields a 84.8% reduction in worst-case low-load output ripple voltage and a 1.5% increase in peak efficiency reaching 92.5%, while also providing a predictable spectrum of the switching noise, reducing the risk of interfering with other sensitive circuits.
Original languageEnglish
Title of host publication43rd IEEE European Solid State Circuits Conference (ESSCIRC 2017)
Number of pages4
Publication date2017
ISBN (Electronic)978-1-5090-5025-3
Publication statusPublished - 2017
EventESSCIRC 43rd European Solid-State Circuits Conference - Leuven, Belgium
Duration: 11 Sep 201714 Sep 2017
Conference number: 43


ConferenceESSCIRC 43rd European Solid-State Circuits Conference
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