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A double-stage start-up structure to limit the inrush current used in current mode charge pump

2016; IOP Publishing; Volume: 37; Issue: 6 Linguagem: Inglês

10.1088/1674-4926/37/6/065006

2058-6140

Cong Liu, Xinquan Lai, Hanxiao Du, Yuan Chi,

Innovative Energy Harvesting Technologies

A double-stage start-up structure to limit the inrush current used in current-mode charge pump with wide input range, fixed output and multimode operation is presented in this paper. As a widely utilized power source implement, a Li-battery is always used as the power supply for chips. Due to the internal resistance, a potential drop will be generated at the input terminal of the chip with an input current. A false shut down with a low supply voltage will happen if the input current is too large, leading to the degradation of the Li-battery's service life. To solve this problem, the inrush current is limited by introducing a new start-up state. All of the circuits have been implemented with the NUVOTON 0.6 μm CMOS process. The measurement results show that the inrush current can be limited below 1 A within all input supply ranges, and the power efficiency is higher than the conventional structure.