A Three-Fine-Level Buck–Boost Hybrid Converter Achieving Half- ${V}_{\mathrm{IN}}$ -Stress on All Switches and Fast Transient Response

Shuangxing Zhao1,2; Chenchang Zhan1; Zhaobo Zhang1,2; Xianglong Bai1,2; Chenyu Huang1,2; Yan Lu3,4

2024

10.1109/JSSC.2024.3453950

IEEE Journal of Solid-State Circuits   影响因子和分区

1558-173X

This article presents a non-inverting three-fine-level buck–boost (3FLBB) hybrid converter suitable for lithium-ion (Li-ion) batteries. With seven power switches and two flying capacitors, the proposed 3FLBB converter produces the voltage of switching node between $V_{\mathrm{IN}}$ /2, $V_{\mathrm{IN}}$ , and 3 $V_{\mathrm{IN}}$ /2, which supports buck, boost, and buck–boost modes, and with smooth mode changes. Here, one of the two flying capacitors is used to drive the inductor (L), while another one is used to ensure that $V_{\mathrm{DS}}$ of each power switch is within 1/2 $V_{\mathrm{IN}}$ in all phases. Hence, the voltage stress of all the power switches is reduced to half- $V_{\mathrm{IN}}$ , and the normalized equivalent resistance and switching losses are greatly reduced by using two 1.8-V switches instead of two 5-V switches. Since the three modes all have buck-like operation, the average inductor current is reduced to always equal to the output current. Meanwhile, they all have continuous output current, similar complex pole pairs, and no right half-plane (RHP) zero, which enables fast load transient response. This design is implemented by only 1.8-V devices of a standard 0.18- $\mu$ m CMOS process, covering an input voltage range from 2.8 to 4.2 V. A 98.2% peak efficiency is measured at 2-MHz switching frequency with 2.2- $\mu$ H L, two 10- $\mu$ F flying capacitors, and one 10- $\mu$ F output capacitor. It can deliver an output current of 50–1000 mA at a 3.3-V regulated output voltage. Moreover, the measured results show that this design achieves a significant improvement on undershoot and overshoot voltage than the previous works.

第一

1.School of Microelectronics, Southern University of Science and Technology, Shenzhen, China
2.Institute of Microelectronics, FST-DECE, State Key Laboratory of Analog Mixed-Signal VLSI, University of Macau, Macau, China
3.Institute of Microelectronics, FST-DECE, University of Macau, Macau, China
4.Department of Electronic Engineering, Tsinghua University, Beijing, China

Shuangxing Zhao,Chenchang Zhan,Zhaobo Zhang,等. A Three-Fine-Level Buck–Boost Hybrid Converter Achieving Half- ${V}_{\mathrm{IN}}$ -Stress on All Switches and Fast Transient Response[J]. IEEE Journal of Solid-State Circuits,2024,PP(99).

Shuangxing Zhao,Chenchang Zhan,Zhaobo Zhang,Xianglong Bai,Chenyu Huang,&Yan Lu.(2024).A Three-Fine-Level Buck–Boost Hybrid Converter Achieving Half- ${V}_{\mathrm{IN}}$ -Stress on All Switches and Fast Transient Response.IEEE Journal of Solid-State Circuits,PP(99).

Shuangxing Zhao,et al."A Three-Fine-Level Buck–Boost Hybrid Converter Achieving Half- ${V}_{\mathrm{IN}}$ -Stress on All Switches and Fast Transient Response".IEEE Journal of Solid-State Circuits PP.99(2024).