WS4508S

WS4508S 1000mA, Single Li-ion Battery Charger WS4508S Http//:www.sh-willsemi.com Descriptions The WS4508S 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 4.2V, and the charge current can be programmed externally with a single resistor. SOP-8L-EP CE CHGb STDBYb BAT 87 65 The WS4508S 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 WS4508S automatically enters a low current state, dropping the battery drain current to less than 0.5uA. The WS4508S can be put into shutdown mode, reducing supply current...