An Automotive 12 V-to-1.2 V Integrated Switched-Capacitor DC–DC Converter for Improved Load Transient Response
- Authors
- Park, Inho; Kim, Hyunjin; Park, Taehyeong; Jeong, Junwon; Kim, Chulwoo
- Issue Date
- Oct-2023
- Publisher
- Institute of Electrical and Electronics Engineers Inc.
- Keywords
- Capacitors; charge pump; Charge pumps; Control systems; dc–dc converter; Feedback loop; load transient response; power management; Switched capacitor; Switches; Voltage control; Voltage-controlled oscillators
- Citation
- IEEE Transactions on Power Electronics, v.38, no.10, pp 12315 - 12319
- Pages
- 5
- Journal Title
- IEEE Transactions on Power Electronics
- Volume
- 38
- Number
- 10
- Start Page
- 12315
- End Page
- 12319
- URI
- https://scholarworks.sookmyung.ac.kr/handle/2020.sw.sookmyung/159477
- DOI
- 10.1109/TPEL.2023.3292276
- ISSN
- 0885-8993
1941-0107
- Abstract
- This letter presents a 12 V-to-1.2 V switched-capacitor dc–dc converter, which has a voltage conversion ratio of 1/10 with an input voltage of 12 V, for automotive applications. The power stage comprises an 8-phase ladder converter and a 16-phase 3-to-1 converter. All power switches are designed using 5-V isolated CMOS transistors. To improve the load transient response, the bias current for the charge pump of the 3-to-1 converter is adjusted via a dynamic amplifier. The charge pump for the ladder converter is assisted by the feedback loop of the 3-to-1 converter so that it responds fast to the light-to-heavy load transition. The proposed phase-shedding control reduces the overshoot when the load current increases. The proposed work is fabricated in a 180-nm BCD process. For a load step of 60 mA, the light-to-heavy and heavy-to-light responses are improved by 47.28% and 52.50%, respectively. The maximum end-to-end efficiency is measured as 57.80%. IEEE
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