Overview: 120mA Standalone Linear Li-Ion Battery Charger CE3102X Series INTRODUCTION:
The CE3102X is a plete, constant-current/ constant-voltage linear charger for single cell lithium-ion batteries. Its small size and ability to regulate low charge currents make the CE3102X especially well-suited for portable applications using low capacity rechargeable lithium-ion coin cells. Furthermore, the CE3102X is specifically designed to work within USB Power specifications. No external sense resistor is needed, and no blocking diode is required due to internal MOSFET architecture. The charge voltage is fixed at 4.2V and the charge current can be programmed externally with a single resistor. The CE3102X automatically terminates the charge cycle when the charge current drops to 2/10th the programmed value after the final float voltage is reached. When the input supply (wall adapter or USB supply) is removed, the CE3102X automatically enters a low current state, dropping the battery drain current to less than 2μA. The CE3102X can be put into shutdown mode, reducing the supply current to 25μA.
