The LP28009A device is a highly advanced linearcharger for dual-cell Li-Ion and Li-Polymer battery. The device is ideally suited for portable applications since the small ESOP-8 package and low number of external components required.
The device employs a full charge algorithm with trickle current/constant current/constant voltage mode. The device supports charge current up to 1A programmed by a current sense resistor. The device can withstand an input voltage up to 30V which can protect from the accidental insertion of high voltage. The device can withstand a BAT voltage up to 24V which is suited for power battery application. Without input supply, the battery leakage current is about 2µA (typical) with 8.4V battery voltage.
The device provides various safety features for battery charging, including input under voltage lockout, input over-voltage protection, battery temperature protection which is implemented by an internal constant current source and an external NTC thermistor, thermal regulation foldback protection which is implemented by reducing the charge current while the junction temperature attempts to rise up to 160℃.
The LP28009A is available in an ESOP-8 package.
