The HX6001 is a complete constant-current/constant voltage linear charger for single cell lithium-ion batteries. HX6001 ThinSOT package and low external component count make the HX6001 ideally suited for portable applications. Furthermore, the HX6001 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 HX6001 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 HX6001 automatically enters a low current state, dropping the battery drain current to less than 2 A. The HX6001 can be put into shutdown mode, reducing the supply current to 25 A. Other features include charge current monitor, undervoltage lockout, automatic recharge and a status pin to indicate charge termination and the presence of an input voltage.
The HX6001  converters  are  available  in the  industry  standard  SOT-23-5  power packages (or upon request).