WS4508E Datasheet | WillSEMI

600m A, Single Li-ion Battery Charger Http//:.sh-willsemi. Descriptions The WS4508E is a plete 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 4.2V, and the charge current can be programmed externally with a single resistor. SOT-23-5L CHGb 1 5 PROG The WS4508E 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 WS4508E automatically enters a low current state, dropping the battery drain current to less than 0.5u A. The WS4508E can be put into shutdown mode, reducing supply current to...