The LP4070E is a complete constant-current/constant-voltage linear charger for single cell lithium-ion batteries. Its TDFN-6 package and low external component count make the LP4070E ideally suited for portable applications. Furthermore, the device operates from either a USB port or AC adapter. Due to the internal MOSFET architecture,No external sense resistor is needed and no blocking diode is required.Thermal feedback prevents overheating by regulating the charge current to limit the die temperature during high power operation or high ambient temperature conditions.The charge voltage is preset at 4.2V/4.35V and the charge current can be programmed up to 300mA externally with a single resistor. The LP4070E automatically terminates the charge cycle when the charge current drops to 10% programmed value after the final float voltage is reached. When the input supply (wall adapter or USB supply) is removed, the LP4070E automatically enters a low current state, dropping the battery drain current to less than 1μA.
Other features include charge current monitor, automatic recharge and charge status indications.
