TY - GEN
T1 - A 97% high-efficiency 6μs fast-recovery-time buck-based step-up/down converter with embedded 1/2 and 3/2 charge-pumps for li-lon battery management
AU - Ko, Min Woo
AU - Kim, Ki Duk
AU - Woo, Young Jin
AU - Shin, Se Un
AU - Han, Hyun Ki
AU - Huh, Yeunhee
AU - Kang, Gyeong Gu
AU - Cho, Jeong Hyun
AU - Lim, Sang Jin
AU - Park, Se Hong
AU - Lee, Hyung Min
AU - Cho, Gyu Hyeong
PY - 2018/3/8
Y1 - 2018/3/8
N2 - Lithium-ion batteries are generally used in mobile devices, but the voltage range of the battery varies from 2.7 to 4.2V. To provide a mid-3V-range output from the battery, a converter capable of step-up/down-conversion is necessary. For this purpose, non-inverting buck-boost topologies with multimode control [1-3] have been widely used. However, they have limited efficiency slightly higher than 90%, which comes from the fact that a main current path always encompasses two switches. To increase the efficiency in the buck mode where the converter operates for most of the usage time, a flying capacitor buck-boost (FCBB) was proposed in [4]. Despite its high power efficiency, it requires large-size LDMOS to endure a large voltage range up to 8V at switching node, resulting in cost inefficiency. Since all these topologies have a common controller that covers both buck and boost modes of operation, compensator design is challenging. Moreover, a non-minimum-phase system of boost operation makes it hard to achieve a fast loop response. In this paper, we propose a step-up/down DC-DC converter based on buck operation only over the whole input voltage range, which greatly simplifies the controller design and consequently gives fast response. Furthermore, it achieves high efficiency because of the reduced effective resistance on the main current path.
AB - Lithium-ion batteries are generally used in mobile devices, but the voltage range of the battery varies from 2.7 to 4.2V. To provide a mid-3V-range output from the battery, a converter capable of step-up/down-conversion is necessary. For this purpose, non-inverting buck-boost topologies with multimode control [1-3] have been widely used. However, they have limited efficiency slightly higher than 90%, which comes from the fact that a main current path always encompasses two switches. To increase the efficiency in the buck mode where the converter operates for most of the usage time, a flying capacitor buck-boost (FCBB) was proposed in [4]. Despite its high power efficiency, it requires large-size LDMOS to endure a large voltage range up to 8V at switching node, resulting in cost inefficiency. Since all these topologies have a common controller that covers both buck and boost modes of operation, compensator design is challenging. Moreover, a non-minimum-phase system of boost operation makes it hard to achieve a fast loop response. In this paper, we propose a step-up/down DC-DC converter based on buck operation only over the whole input voltage range, which greatly simplifies the controller design and consequently gives fast response. Furthermore, it achieves high efficiency because of the reduced effective resistance on the main current path.
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U2 - 10.1109/ISSCC.2018.8310367
DO - 10.1109/ISSCC.2018.8310367
M3 - Conference contribution
AN - SCOPUS:85046408608
T3 - Digest of Technical Papers - IEEE International Solid-State Circuits Conference
SP - 428
EP - 430
BT - 2018 IEEE International Solid-State Circuits Conference, ISSCC 2018
PB - Institute of Electrical and Electronics Engineers Inc.
T2 - 65th IEEE International Solid-State Circuits Conference, ISSCC 2018
Y2 - 11 February 2018 through 15 February 2018
ER -
