Press Release Summary:
Tailored for single-cell Li-ion batteries, Model AQ9102 can be powered from ac voltage source adapter or USB port, and will automatically select correct source. During charging, unit will actively adapt to system load changes and re-allocate available current to either system or battery. Model AQ9102 requires no external blocking diodes or current sense resistors. It includes battery temperature monitoring, voltage and current monitoring, and charging timers.
Original Press Release:
Adaptor/USB Input Li-Ion Charger with Adaptable Current for Fast, Complete Charging
The AQ9102 is an integrated charger with a charging profile tailored for single-cell Li-ion batteries. This linear charger can be powered from either an AC voltage-source adapter or a USB port, and it will automatically select the correct source. During charging, the charger will actively adapt to the system load changes and re-allocate available current to either the system or the battery, assuring fast charging and a proper charge profile while still permitting full system operation. It provides adjustable system and charging current up to 2.0A.
The AQ9102 requires no external blocking diodes or current sense resistors reducing board space and costs. It requires only 2 external resistors to program the adapter over-current limit and maximum charging current. The AQ9102 provides input adapter over-voltage protection using an external power MOSFET. When the adapter is not present, the AQ9102 draws less than 1 uA of drain current from the battery.
The charger features the three modes required for a safe and reliable Li-ion charging profile; Precharge, Fast-charge, and Termination charge. Extensive safety features include battery temperature monitoring, voltage and current monitoring and charging timers. Thermal-foldback reduces the charge rate if the die temperature becomes excessive. An adjustable timeout for Precharge and Termination periods will shut down the charger in the case of a defective battery. A host system can monitor the actual charge current at the ISET2 pin. Two charging status indicators provide charge state information.
The AQ9102 is packaged in a small MLP-16, with optional Green (halogen-free, Pb-free) packaging.