ACE4054

  www.DataSheet4U.com                                                                                        ACE4054                                               Technology Description Fully integrated constant current/constant voltage Li-ion battery charger The ACE4054 is a single cell, fully integrated constant current (CC) / constant voltage (CV) Li-ion battery charger. Its compact package with minimum external components requirement makes the ACE4054 ideal for portable applications. No external sense resistor or blocking diode is necessary for the ACE4054. Build-in thermal feedback mechanism regulates the charge current to control the die temperature during high power operation or at elevated ambient temperature. The ACE4054 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 ACE4054 keeps monitoring the battery voltage and enables a new charge cycle once the voltage drops by 150mV below the CV value. Power supply state is constantly monitored and the battery drain current is reduced to minimum value automatically when the ACE4054 sensed a lack of input power. In its shutdown mode, the ACE4054 can reduce the supply current to less than 25...