描述 Description

The LX2207 can use a wall adapter or USB power source to charge a single cell Lithium Ion or Lithium Polymer battery. There are three logic selectable and programmable charge current levels: the high charge programming level is typically set for charging from the adapter, the low level charge programming level is typically set to 500mA for USB full USB charging and 100mA (20%) for reduced level USB charging. In addition to setting the high-level charge current, the HCP programming resistor also sets the termination current at 10% of the constant current level and the conditioning current at 5% of the constant current level. Power status indicators (STAT and DCOK) can be configured to show charge in progress, battery fully charged and external power on. The STAT pin is capable of sourcing or sinking 10mA. The DCOK output is an open drain output and can sink 20mA. The LX2207 enters a low quiescent current sleep mode when power is removed or when it is logically shutdown to minimize battery drain. There are several protection features which include: under voltage lock out, reverse current blocking on the IN pin, a thermal loop to reduce charge current to maintain a low die temperature, an unsafe battery temperature charge inhibitor, and conditioning mode is provided for deeply discharged batteries.