Design of Charging and Discharging Switch Structure for Rechargeable Battery Protection IC

2차 전지 보호회로를 위한 충.방전 스위치 구조의 설계

This paper suggests an improved switch architecture for the rechargeable battery protection IC. In the existing protection IC, charging and discharging switches composed of the CMOS transistor and the diode are external components. It is difficult to integrate the switches in a CMOS process due to the large chip-size overhead and inevitable parasitic effects. In this paper, we propose a new switch architecture of the MOSFET's 'diode connection' method. The performance and chip-size overhead are proved to be adequate for the fully integrated protection IC.