AnalogicTech has introduced the AAT3672, a highly integrated, single-cell Lithium-ion/polymer battery charger and system management IC. Using an innovative three-switch architecture, the dual path device enables simultaneous battery charging and system load management. It automatically reroutes power from the battery to the system without interruption when load requirements exceed available current.
The AAT3672 is a single input dynamic battery charger and control IC, compatible with either an AC power adapter or a USB power source. The device regulates battery charge current and voltage for 4,2 V Li-on battery cells. Battery charge current can be programmed up to 1,6 A.
Three internal switches on the device provide dynamic power sourcing to the system load. If the system load exceeds the input current supply from the input source, the device supplies additional current from the battery cell. It automatically manages distribution of power between the source, the battery and the system simultaneously to support all power needs, charging the battery cell with the maximum amount of current possible.
To help minimise charge time and protect an input source from overload, the AAT3672 features an automatic battery charge current reduction loop that automatically compensates for voltage sags and throttles back the charge current when the input source cannot provide the required load current. This feature protects the charger, system and source supply if an adapter or power source cannot meet the programmed ADP charging mode current demand.
The AAT3672 also features an intelligent thermal loop control system that continuously measures internal circuit die temperature and automatically reduces fast charge current when the device exceeds a preset internal temperature threshold. This function helps optimise charging by maximising charge current under given temperature conditions.
The IC also offers a number of protection features including battery over-voltage, over-current and over-temperature protection circuits, as well as system load current limiting capability. Qualified across the -40°C to +85°C temperature range, the AAT3672 is available in a compact 14-pin, 3 x 3 mm TDFN package.
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