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Open AccessArticle

Fully Integrated Low-Ripple Switched-Capacitor DC–DC Converter with Parallel Low-Dropout Regulator

Microwave Embedded Circuit and System Laboratory, School of Electrical Engineering, Chung-Ang University, Seoul 06974, Korea
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Electronics 2019, 8(1), 98; https://doi.org/10.3390/electronics8010098
Received: 20 November 2018 / Revised: 5 January 2019 / Accepted: 11 January 2019 / Published: 16 January 2019
(This article belongs to the Special Issue Signal Processing and Analysis of Electrical Circuit)
In this paper, we propose a fully integrated switched-capacitor DC–DC converter with low ripple and fast transient response for portable low-power electronic devices. The proposed converter reduces the output ripple by filtering the control ripple via combining a low-dropout regulator with a main switched-capacitor DC–DC converter with a four-bit digital capacitance modulation control. In addition, the four-phase interleaved technique applied to the main converter reduces the switching ripple. The proposed converter provides an output voltage ranging from 1.2 to 1.5 V from a 3.3 V supply. Its peak efficiency reaches 73% with ripple voltages below 55 mV over the entire output power range. The transient response time for a load current variation from 100 μA to 50 mA is measured to be 800 ns. Importantly, the converter chip, which is fabricated using 0.13 μm complementary metal–oxide–semiconductor (CMOS) technology, has a size of 2.04 mm2. We believe that our approach can contribute to advancements in power sources for applications such as wearable electronics and the Internet of Things. View Full-Text
Keywords: DC–DC converter; switched capacitor; power management integrated circuit; CMOS technology DC–DC converter; switched capacitor; power management integrated circuit; CMOS technology
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Lee, J.-Y.; Kim, G.-S.; Oh, K.-I.; Baek, D. Fully Integrated Low-Ripple Switched-Capacitor DC–DC Converter with Parallel Low-Dropout Regulator. Electronics 2019, 8, 98.

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