AQ120

The AQ120 is a low cost linear battery charger controller with similar features to the industry standard "1734" style controller, but with the extra ability to charge multiple cell Lithium Ion batteries as well as NiCad types. In addition, the maximum Vin is 18 volts. The AQ120 flexibility allows the setting of the charge voltage and current with a minimum number of external components. The open collector output of AQ120 is capable of driving an external PNP transistor. A temperature stable bandgap reference (1.25 V) controls the maximum output voltage, while a current control circuit sets a constant charging current.