Programmable switching battery charger

A programmable switching battery charger (801) comprising a switching regulator (803) having at least one switching transistor (821), the switching transistor having first input (IN) and a first output (OUT), wherein the first input of the switching transistor is coupled to a USB power source (810); a filter (804) having a first input and a first output, wherein the first input of the filter is coupled to the first output of the switching transistor; a battery (850) coupled to the first output of the filter; at least one controller (823) coupled to at least one sensing input (824), to a programmable data storage element and to a control terminal of the switching transistor (821A), wherein the programmable data storage element is adapted to configure the controller to set a signal to the battery and a corresponding method for charging a battery.