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The DIO5519B is a complete constant-current/ constant voltage linear charger for single cell Lithium-Ion batteries. No external sense resistor is needed, and no blocking diode is required due to the internal MOSFET architecture. Thermal feedback regulates the charge current to limit the die temperature during high power operation or high ambient temperature. The charge voltage is fixed at 4.35V for DIO5519B, and the charge current can be programmed externally with a single resistor. The DIO5519B automatically terminates the charge cycle when the charge current drops to 1/10 the programmed value after the final float voltage is reached. When the input supply (wall adapter or USB supply) is removed, the DIO5519B automatically enters a low current state, dropping the battery drain current to less than 0.5µA. The DIO5519B can be put into shutdown mode, reducing supply current to 40µA (Typ.). The DIO5519B is available in a small package with DFN1.2*1.2-6. Standard product is Pb-Free.