Abstract: A single integrated circuit package for controlling the charging circuits of a battery charger. The single integrated circuit package comprises a microcontroller, switch mode power supply controller(s), analog to digital converter and analog input multiplexer which may be fabricated on a single integrated circuit die, or the microcontroller may be on one integrated circuit die, and the remaining aforementioned circuits may be on a second integrated circuit die. The switch mode power supply controller is adapted for connection to a power converter which is used to control the voltage and/or current to a battery being charged. The power converter may also be on the same integrated circuit die as the switch mode power supply controller, or may be on a separate semiconductor die but included in the single integrated circuit package. Single or multiple batteries may be charged using charging algorithms specifically tailored to each battery.