BATTERY POWER PATH MANAGEMENT APPARATUS AND METHODS

摘要

A control circuit of a battery power path management circuit (190) establishes a first power path between a battery input node (102') and an output node (104) when the input node voltage is larger than a charger input node voltage and a second power path between the charger input node (102) and the output node (104) when the voltage on the charger input node (102) is larger than the battery input node voltage (102'). It controls the second power path to provide power to the output node (104), 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.