Abstract: A circuit for limiting an in-rush current for devices coupling to a capacitive load may include a port configured to receive a device and a first capacitor coupled to the port. Additionally, the circuit may include a first resistor coupled in series with the first capacitor and a switch coupled in parallel with the first resistor. The switch is configured to close after an in-rush current event has passed, thereby bypassing the first resistor from the circuit and enabling the first capacitor to effectively filter noise from the voltage output to the port.

Abstract: A charger circuit includes an interface connector that may be coupled to a power adapter that provides an input signal having an input voltage, and a buck-boost converter circuit that may be coupled to a battery having a charging voltage. At a given time, the buck-boost converter circuit operates in a mode in a group of modes based on a control signal, where the group of modes may include at least a buck mode and a boost mode. In particular, the charger circuit includes control logic that generates the control signal based on the charging voltage and a charging capability of the power adapter. Thus, if the charging voltage suitably exceeds the input voltage, the buck-boost converter circuit may operate in the boost mode. However, if the charging voltage is approximately less than or equal to the input voltage, the buck-boost converter circuit may operate in the buck mode.