SE9016 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 SE9016 ideally suited for portable applications. Furthermore, the SE9016 is specifically designed to work within USB power specification. At the same time, SE9016 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 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 SE9016 automatically terminates the charge cycle when the charge current drops to 1/10th the programmed value after the final float voltage is reached.