LY4080B is a 5V input supporting boost charge management application for two lithium batteries connected in series. Adopting switching voltage structure, S0P8 package with heat sink and low number of external components make LY4080B an ideal choice for portable applications. The input voltage of LY4080B is 5V, and the built-in adaptive loop intelligently adjusts the charging current to prevent the charger output from being lowered. Can work with USB power and adapter.
Thermal feedback can automatically adjust the load current to limit the chip temperature during high-power operation or high ambient temperature conditions. The charging voltage is fixed at 8.4 V, while the charging current can be adjusted externally via a resistor. When the charging current drops to 1/10 of the set value after reaching thefinal floating voltage, the LY4080B automatically ends the charge cycle.
When the input voltage (AC adapter or USB power supply) is removed, the LY4080B automatically enters a low current state, reducing the battery leakage current to less than luA. Other features of the LY4080B include undervoltage lockout, auto-recharge, and a charging indicator status pin.