ETA4084

ETA4084 is a fully integrated constant current (CC)/constant voltage (CV) charger for 2 cell Li-ion battery. Its compact package with minimum external components requirement makes the ETA4084 ideal for portable applications. No external sense resistor or blocking diode is necessary for the ETA4084. Build-in thermal feedback mechanism regulates the charge current to control the die temperature during high power operation or at elevated ambient temperature. The ETA4084 has a pre-charge function for trickle charging deeply discharged batteries. The fast charge current can be programmed by an external resistor. CV regulation mode is automatically enabled once the battery’s charging curve reaches the constant voltage portion. The output current then decays and is finally terminated once the charge current drops to 1/10th of the programmed value. The ETA4084 keeps monitoring the battery voltage and enables a new charge cycle once the voltage drops by 150mV below the CV value.