A 65nm CMOS Process Li-Ion Battery Charging Cascode SIDO Boost Converter with 89% Maximum Efficiency for RF Wireless Power Transfer Receiver

Yasuaki ISSHIKI; Dai SUZUKI; Ryo ISHIDA; Kousuke MIYAJI

doi:10.1587/transele.2019CTP0003

Special Section on Analog Circuits and Their Application Technologies

A 65nm CMOS Process Li-Ion Battery Charging Cascode SIDO Boost Converter with 89% Maximum Efficiency for RF Wireless Power Transfer Receiver

Yasuaki ISSHIKI, Dai SUZUKI, Ryo ISHIDA, Kousuke MIYAJI

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Keywords: RF wireless power transfer, SIDO boost converter, battery charger, low power

JOURNAL RESTRICTED ACCESS

2020 Volume E103.C Issue 10 Pages 472-479

DOI https://doi.org/10.1587/transele.2019CTP0003

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Abstract

This paper proposes and demonstrates a 65nm CMOS process cascode single-inductor-dual-output (SIDO) boost converter whose outputs are Li-ion battery and 1V low voltage supply for RF wireless power transfer (WPT) receiver. The 1V power supply is used for internal control circuits to reduce power consumption. In order to withstand 4.2V Li-ion battery output, cascode 2.5V I/O PFETs are used at the power stage. On the other hand, to generate 1V while maintaining 4.2V tolerance at 1V output, cascode 2.5V I/O NFETs output stage is proposed. Measurement results show conversion efficiency of 87% at P_IN=7mW, I_LOAD=1.6mA and V_BAT=4.0V, and 89% at P_IN=7.9mW, I_LOAD=2.1mA and V_BAT=3.4V.

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