PST4069

The PST4069 is a complete constant-current/ constant voltage linear charger for single cell lithiumion battery. Its SOT23-6/TDFN-8 package and low external component count make the PST4069 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 4.2V, and the charge current can be ISET programmed externally with a single resistor.The PST4069 automatically terminates the charge cycle when the charge current drops to 1/10 setting current value after the final float voltage is reached.When the input supply is removed, the PST4069 automatically enters a low current state, dropping the battery drain current to less than 1µA.Other features include charge current monitor, undervoltage lockout, automatic recharge and a status pin.