YB1880

YB1880 is a complete constant-current & constant voltage linear charger for single cell lithium-ion batteries. Its SOT-23 package and low external component count make YB1880 ideally suited for portable applications. Furthermore, the YB1880 is specifically designed to work within USB power specification. At the same time, YB1880 can also be used in the standalone lithium-ion battery charger.

No external sense resistor is needed, and no blocking diode is required due to the internal MOSFET architecture. Thermal feedback regulates the charger 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. The YB1880 automatically terminates the charge cycle when the charge current drops to 1/10th the programmed value after the final float voltage is reached.

When the input supply (wall adapter or USB supply) is removed, the YB1880 automatically enters a low current stage, dropping the battery drain current to less than 2A. The YB1880 can be put into shutdown mode, reducing the supply current to 20A.Other features include charge current monitor, under-voltage lockout, automatic recharge and a status pin to indicate charge termination and the presence of an input voltage.