AAT3672IWO-4.2-1-T1

Dynamic Battery Charger and Power Manager 4V to 6.5V 14Pin TDFN EP T/R

The AAT3672 BatteryManager is a highly integrated single-cell 4.2V lithium-ion/polymer battery charger and system power management IC that enables simultaneous battery charging and system load management. The AAT3672 provides charging current and system power management from a single input that may be supplied by an AC adapter or USB port power source. This device allows the user to program the battery charge current up to 1.6A depending on the current shared with the system output. A battery charge timeout timer is provided for charging safety and the charge termination current is also user-programmable. The AAT3672 employs a battery charge current reduction function that enables continued system operation in the event the input source can not supply the required load current. When operated under excessive thermal conditions, the AAT3672 has a digitally controlled thermal loop which allows the maximum possible charging current for any given ambient temperature condition. Battery temperature, voltage and charge state are monitored for fault conditions. The AAT3672-1/-2 has two status monitor output pins STAT1 and STAT2 , and the AAT3672-3 has only one status monitor output STAT1 provided to indicate battery charge status by directly driving external LEDs. The AAT3672 is available in a Pb-free, thermally enhanced, space-saving 14-pin 3x3mm TDFN package.