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In this study, the current sampling method and the highly integrated switch proposed are successfully integrated into a prototype single lithium battery management chip, which was designed by the authors and fabricated with 0.18 μm 5 V technology. Fig. 13 demonstrates the die microphotograph of the chip. The proposed switch occupies 0.2829 mm 2.
Based on the 0.18 μm 5 V process, the circuit and the switch have been integrated into a single lithium battery management chip. The measurements show that the chip can reliably protect the battery from overvoltage, under voltage and overcurrent with low power consumption.
The battery management chip consumes 0.838 μA of quiescent current, and its power down current is less than 10 nA. The two current detection circuits and bandgap circuits consume almost more than half of the power. This is the overhead of a single lithium battery management chip at a power supply of 3.6 V. Fig. 13. Chip microphotograph. Fig. 14.
The external charging and discharging switches are integrated into the chip. Proposing adaptive substrate selecting technology, the charging switch and discharging switch can be converted into a single switch. In this paper, a highly integrated one cell battery management chip is proposed.
A typical single lithium battery management system is mentioned in literature [ 11, 12 ], the shortcomings of those system are quite obvious. Firstly, those chips need to provide charging FET and discharging FET pins to control the corresponding switches outside the chip.
In summary, a new switch method for a one-cell lithium battery management chip was demonstrated in this study. To decrease the size caused by the traditional battery management system and minimize the cost effectively, a new switch and current detection circuits were designed and integrated into the lithium battery management chip.
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The battery management chip is designed to integrate the discrete charging and discharging MOSFETs into the chip, even removing current sense resistor significantly.
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