The LP28021D is a complete constant-current/ constant voltage linear charger for single cell lithium-ion battery. 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 by ISET pin with a single resistor.
The LP28021D automatically terminates the charge cycle when the charge current drops to 1/10 setting current value after the final float voltage is reached. Other features include charge current monitor, under voltage lockout, automatic recharge and charge status pins.
