홈

Seung-Ju Lee (Graduate Student Member, IEEE) received the B.S. degree in display engineering from Dankook University, Cheonan, South Korea, in 2021, and the M.S. degrees with the department of electrical engineering, Ulsan National Institute of Science and Technology (UNIST), Ulsan, South Korea, in 2024. He is currently pursuing the Ph.D degrees with the graduate school of semiconductor technology, Pohang University of Science and Technology (POSTECH), Pohang, South Korea.

His research interests include analog-integrated circuit designs, such as power management IC, linear regulators, switched capacitor/inductive converters, and hybrid converter topology.

Education

Ph.D Student Researcher (Mar. 2024 - Present)

- Pohang University of Science and Technology (POSTECH) - Electrical Engineering - PICTUS LAB. (Advisor : Se-Un Shin)

M.S. Student Researcher (Mar. 2021 - Feb. 2024)

- Ulsan National Institute of Science and Technology (UNIST) - Electrical Engineering - PICTUS LAB. (Advisor : Se-Un Shin)

B.S. Student (Mar. 2015 - Feb. 2021)

- Dankook University - Display Engineering (Graduated Second-Class Honor)

Publications (International)

Conference

[7] Yeon-Woo Jeong, Seung-Ju Lee, Jong-Hun Kim, Mun-Jung Cho, Min-Sik Kim, Myeong-Ho Kim, Hyun-Sik Kim, and Se-Un Shin* "A Fast Start-Up Dual Energy Harvesting IC with Battery-Independent Synchronous Accumulated Electric Charge Extraction (SAECE) Achieving 660% FoMavg for Piezoelectric Energy Harvesting" IEEE Asian Solid-state Circuits Conference (A-SSCC), Nov. 2025.

[6] Mun-Jung Cho, Seung-Ju Lee, Yeon-Woo Jeong, Jong-Hun Kim, Min-Sik Kim, Myeong-Ho Kim, Geon Kim, Min-Gyu Jeong, Dong-Chan Lee, Se-Un Shin, "Dual-Output RF Energy Harvester with Adaptive Energy Buffering for Enhanced Power Availability Under Intermittent Input for PPG Sensors", 2025 International Symposium on Antennas and Propagation (ISAP), Oct. 2025.

[5] Mun-Jung Cho*, Changsik Shin*, Seung-Ju Lee, Jong-Hun Kim, Yeon-Woo Jeong, Min-Sik Kim, Myeong-Ho Kim, Hyuntak Jeon, Se-Un Shin, "A 90-260 VAC Isolated Offline Single-Stage Single-Transformer-Winding Multiple-Output (STWMO) RGBW LED Driver with <0.7% Current Variation and Dimmable Current-Regulated Error-Based Control", IEEE Symposium on VLSI Circuits (VLSIC), Jun. 2025.

[4] Seung-Ju Lee, Yeon-Woo Jeong, Jong-Hun Kim, Mun-Jung Cho, Min-Sik Kim, Myeong-Ho Kim, Se-Un Shin, "A 94.1%-Efficiency Flying-Capacitor-Shared 2-Inductor 3-Level Boost Converter with Simultaneous VCF and IL Balance Achieving <0.92%-VCF and <0.22%-IL Error", IEEE Symposium on VLSI Circuits (VLSIC), Jun. 2025.

[3] Jong-Hun Kim, Seung-Ju Lee, Yeon-Woo Jeong, Mun-Jung Cho, Min-Sik Kim, Myeong-Ho Kim, Se-Un Shin, ''Programming-Free Three-Dimensional Resonant Current-Mode Wireless Receiver with Real-Time Link-Adaptivity and a 0.904 cm3 Receiver Coil for Implantable Systems", IEEE International Solid-State Circuit Conference (ISSCC), Feb. 2025.

[2] Yeon-Woo Jeong, Seung-Ju Lee, Jong-Hun Kim, Mun-Jung Cho, Hwa-Soo Kim, Se-Un Shin, ''A Scalable N-Step Equal Split SSHI Piezoelectric Energy Harvesting Circuit Achieving 1170% Power Extraction Improvement and 22nA Quiescent Current with a 1μH-to-10μH Low Q Inductor", IEEE International Solid-State Circuits Conference (ISSCC), Feb. 2023.

[1] Seung-Ju Lee, Yeon-Woo Jeong, Mun-Jung Cho, Jong-Hun Kim, Hwa-Soo Kim, Jun-Suk Bang, Se-Un Shin, "A 95.3% 5V-to-32V Wide Range 3-Level Current Mode Boost Converter with Fully State-based Phase Selection Achieving Simultaneous High-Speed VCF Balancing and Smooth Transition", IEEE International Solid-State Circuits Conference (ISSCC), Feb. 2023.

Journal

[6] Jong-Hun Kim, Seung-Ju Lee, Seogyong Jeong, Yeon-Woo Jeong, Mun-Jung Cho, Hyuntak Jeon, Se-Un Shin, "A Real-Time Link-Adaptive Three-Dimensional Resonant Current-Mode Wireless Receiver with Self-Optimizing Control" IEEE Journal of Solid-State Circuits (JSSC). (Accepted)

[5] Min-Sik Kim, Jong-Hun Kim, Seogyong Jeong, Seung-Ju Lee, Hyuntak Jeon, Se-Un Shin, "A Wide Load Range Output Capacitor-Less LDO with Load Tracking Zero Compensation for IoT Applications" IEEE Transactions on Industrial Electronics (TIE).

[4] Yeon-Woo Jeong, Seung-Ju Lee, Se-Un Shin " A Scalable N-Step Equally Split SSHI Rectifier for Piezoelectric Energy Harvesting with Low-Q Inductor" IEEE Journal of Solid-State Circuits (JSSC), vol. 58, no. 12, pp. 3519-3529, Dec. 2023, invited paper from ISSCC.

[3] Seung-Ju Lee, Yeon-Woo Jeong, Se-Un Shin " A Three-Level Boost Converter with Fully State-Based Phase Selection Technique for High-Speed VCF Calibration and Smooth Mode Transition" IEEE Journal of Solid-State Circuits (JSSC), vol. 58, no. 12, pp. 3544-3554, Dec. 2023, invited paper from ISSCC.

[2] Hyun-Su Lee, Jisan Ahn, Kyeongho Eom, Woojoong Jung, Seung-Ju Lee, Yeon-Woo Jeong, Se-Un Shin, and Hyung-Min Lee, "A Power-Efficient Resonant Current Mode Receiver with Wide Input Range over Breakdown Voltages Using Automated Maximum Efficiency Control", IEEE Transactions on Power Electronics (TPE), vol. 37, no. 7, pp. 8738-8750, Jul. 2022.

[1] Jong-Hun Kim, Najam ul Hassan, Seung-Ju Lee, Yeon-Woo Jung, Se-Un Shin, "A Resonant Current-Mode Wireless Power Transfer for Implantable Medical Devices – An Overview", Biomedical Engineering Letters (BMEL), May 2022.

Domestic Journal & Conference

[7] Mun-Jung Cho, Seung-Ju Lee, Jong-Hun Kim, Se-Un Shin "A High-Efficiency Dual Path Buck-Boost Converter with Wide Input Range" The 30th Korean Conference on semiconductors (KCS) (한국반도체학술대회), Feb. 2023.

[6] Seung-Ju Lee, Se-Un Shin "USB PD 용 Bidirectional Power Conversion을 위한 Wide Conversion Ratio Symmetric Three-Level Buck-Boost Converter", 제6회 반도체공학회 종합학술대회, Dec. 2023.

[5] Seung-Ju Lee, Se-Un Shin "Three-Level Boost Converter의 고속 VCF Calibration과 Smooth Mode Transition을 위한 완전 상태 기반 컨트롤", 제6회 반도체공학회 종합학술대회, Dec. 2023.

[4] Seung-Ju Lee, Se-Un Shin "고주파 대역 전력 증폭기의 서플라이 모듈레이터를 위한 2-x 스위치드 커패시터 기반 하이브리드 부스트 컨버터", 한국전자파학회 하계종합학술대회, Aug. 2023.

[3] Seung-Ju Lee, Se-Un Shin "Solid-State Drives 용 1:2 Switched-Capacitor 기반 DC-DC Boost Converter", 제5회 반도체공학회 종합학술대회, Dec. 2022.

[2] Seung-Ju Lee, Se-Un Shin "A Voltage Mode PWM DC-DC Boost Converter with Adaptive Dead-time Generator for Solid-State Drives" Journal of Integrated Circuits and Systems (JICAS), VOL 8, No.3, July 2022.

[1] Seung-Ju Lee, Se-Un Shin "A Switched Capacitor Based DC-DC Boost Converter with Adaptive Dead-time Generator for Solid-State Drives" IDEC Congress Chip Design Contest (CDC), July 2022.

Patents

[2] 이승주, 신세운, "다중 인덕터 다중 레벨 DC-DC 컨버터의 전류/전압 불균형 통합 보정 방법 및 장치 ",

- 출원번호 10-2025-0126632, 출원일 2025.09.05.

[1] 이승주, 신세운, "3-레벨 부스트 컨버터용 제어 회로",

- 출원번호 10-2023-0020666, 출원일 2023.02.16.

- 특허번호 제 10-2826182 호, 등록일 2025.06.24.

Awards

[4] 산업통상자원부 주최, POSTECH 반도체대학원 주관 산학프로젝트 챌린지 2위, 2025.09.29.

[3] 2025 한국이공학진흥원 차세대 공학연구자상, 최우수상, 2025.10.24.

[2] 29th Samsung Humantech Paper Award, Participation Prized, 2023.02.20.

[1] Academic Excellence Award, Dankook University, 2021.02.18.

Honors

[3] 제2기 한국이공학진흥원 (IPESK) 차세대 공학연구자 선정, Aug. 2025

[2] Doctoral Research Fellowship in Science and Engineering, National Research Foundation of Korea, Sep. 2024 - Present

[1] Academic Excellence Scholarship at Dankook University, 2015 - 2020

- 2015 (Spring)

- 2018 (Spring & Fall)

- 2019 (Spring & Fall)

- 2020 (Spring & Fall)

Tools

Cadence Virtuoso (Spectre, Calibre, EMX, Finesim)

Powersim (PSIM)

SIMetrix/SIMPLIS

Ansys HFSS

OrCAD (PSpice, PCB Design)

KiCAD (PCB Design)

LTspice

Others

Military duty - Republic of Korea Air Force Sergeant, Honorable Discharge, 2015.12.14. - 2017.12.13.

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