Details

Autor(en) / Beteiligte

• Ko, Min-Woo
• Han, Hyunki
• Kim, Hyun-Sik

Titel

A Bipolar-Output Switched-Capacitor DC-DC Boost Converter With Residual-Energy-Recycling Regulation and Low Dropout Post-Filtering Techniques

Ist Teil von

• IEEE journal of solid-state circuits, 2023-05, Vol.58 (5), p.1-14

Ort / Verlag

New York: IEEE

Erscheinungsjahr

2023

Quelle

IEEE Electronic Library Online

Beschreibungen/Notizen

• This article presents an energy-efficient, low-noise, and bipolar-output step-up switched-capacitor converter (SCC) with ultralow dropout post-regulation, which aims to power a noise-sensitive thin-film transistor (TFT) circuitry in mobile applications. The residual-energy-recycled (RER) step-up SCC is proposed to realize fine-grained voltage conversion ratios (VCRs) without degrading the power efficiency. It also enables the current density to be highly relaxed, thereby integrating many capacitors of the SCC into the chip. To achieve high power-supply rejection (PSR) under an extremely low dropout voltage (<inline-formula> <tex-math notation="LaTeX">V_{\mathrm{DO}})</tex-math> </inline-formula> granularly regulated by the RER step-up SCC, a voltage/current-hybrid (VIH) post-regulator is also presented in this work. The proposed bipolar-output (<inline-formula> <tex-math notation="LaTeX">\pm</tex-math> </inline-formula>15 V) boost converter able to supply up to 600 mW is implemented in a 0.18-<inline-formula> <tex-math notation="LaTeX">\mu</tex-math> </inline-formula>m BCD process. The fabricated RER step-up SCC, capable of reconfiguring the VCR from 3<inline-formula> <tex-math notation="LaTeX">\times</tex-math> </inline-formula> to 5<inline-formula> <tex-math notation="LaTeX">\times</tex-math> </inline-formula> with a step size of <inline-formula> <tex-math notation="LaTeX">\times</tex-math> </inline-formula>1/32, achieves a peak efficiency of 91.7%. The VIH post-regulator shows a PSR of <inline-formula> <tex-math notation="LaTeX">-</tex-math> </inline-formula>75 dB at 30 kHz while consuming a very low <inline-formula> <tex-math notation="LaTeX">V_{\mathrm{DO}}</tex-math> </inline-formula> (1% of the final output). The total system efficiency is measured to be 90.5%, and the output noise integrated from 10 Hz to 0.5 MHz is 28.7 <inline-formula> <tex-math notation="LaTeX">\mu </tex-math> </inline-formula>V<inline-formula> <tex-math notation="LaTeX">_{\mathrm{RMS}}</tex-math> </inline-formula>, including the SCC ripple.