XT2056

Single Nickel-Zinc Batteries Charger With Thermal Regulation XT2056 ■ General Description The XT2056 is a complete constant-current /constant -voltage linear charger for single cell nickel-zinc batteries. Its ThinSOT package and low external component count make the XT2056 ideally suited for portable applications. 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 1.895V, and the charge current can be programmed externally with a single resistor. The XT2056 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 is removed, the XT2056 automatically enters a low current state, dropping the battery drain current to less than 2µA. Other features include ...