资 源 简 介
High Input Voltage ChargerThe ISL9222 is a cost-effecTIve, fully integrated high inputvoltage single-cell Li-ion battery charger. The charger uses aCC/CV charge profile required by Li-ion batteries. Thecharger accepts an input voltage up to 28V but is disabledwhen the input voltage exceeds the OVP threshold, typically6.8V, to prevent excessive power dissipaTIon. The 28V raTIngeliminates the overvoltage protecTIon circuit required in a lowinput voltage charger.The charge current is user programmable with an externalresistor. When the battery voltage is lower than typically2.55V, the charger preconditions the battery with typically20% of the programmed charge current. An internal thermalfoldback function protects the charger from any thermalfailure.AN indication pin PPR allows simple interface to amicroprocessor or LED. When no adapter is attached orwhen disabled, the charger draws less than 1μA leakagecurrent from the battery.
