Invention Grant
US08541981B2 Low-voltage dual-power-path management architecture for rechargeable battery monitoring solutions 有权
低电压双电源路径管理架构,用于充电电池监控解决方案

Low-voltage dual-power-path management architecture for rechargeable battery monitoring solutions
Abstract:
A control circuit of a battery power-path management circuit establishes a first power path between a battery input node and an output node when the input node voltage is larger than a charger input node voltage and a second power path between the charger input node and the output node when the voltage on the charger input node is larger than the battery input node voltage. It controls the second power path to provide power to the output node, enabling battery charging and protection over a battery voltage range from about zero volts. It has low power consumption and can support wide-swing power supply voltage from as low as one volt to as high as maximum allowed Vds of drain-extended devices. It can use smaller device sizes because the PMOS switch gate voltage is 0V when the power supply is not too high.
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