HX4056

HX4056 1A Standalone Linear Li - lon Battery Charger General Description The HX4056 is a complete constant-current/constant- voltage linear charger for single cell lithium -ion batteries. Its ESOP8 package and low external component count make the HX4056 ideally suited for portable applications. Furthermore, the HX4056 is specifically designed to work within USB power specifications. 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. The HX4056 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 HX4056 automatically enters a ...