LX2201CLQ

USB锂离子电池充电器 USB Li-Ion Battery Charger

Description: The LX2201 Linear Battery Charger is a 2-stage multi-state L-ion battery charger Constant current/Constant voltage that can supply up to 2A of charging current into a single cell Lithium-Ion battery. While the LX2201 is a general-purpose charger, it features several built in programming states specifically for compliance with USB bus specifications. Monitoring the input current supplied by the system and then dynamically allocating any unused power to the charging circuitry maintains USB compliance with respect to peripheral current limitations. This feature insures that the battery will be charged as soon as possible without sacrificing system performance or features. The LX2201 is a highly integrated charger that requires just three external programming resistors; one for setting the constant charge current level, one for setting the termination charge current, and one for setting the Vin maximum current. It also has an internal thermostat that will throttle back the charge current to keep the die temperature from exceeding 150C; this feature insures the LX2201 delivers the maximum charge rate for a given thermal environment. A logic input is provided to select either 4.1V or 4.2V battery chemistries. A high accuracy current sensing circuit is implemented allowing batteries to be filled to the fullest capacity before terminating the charge cycle. Since the battery terminal voltage is separated from the system load when charging from an adapter, trickle charging, which can prematurely age the Li-ion battery, is avoided. The LX2201 provides a charging status indicator. The integrated PMOS pass element features low drop out voltage while providing an inherent load disconnect with virtually no drain on the battery when disabled or when the input power is removed. Additionally a battery load disconnect switch has been integrated providing seamless power switching when transitioning between charge and discharge. The LX2201 features a pre-charge conditioning mode for batteries that have been deeply discharged and also has a top off charge mode for batteries that are left on the charger for extended periods. The LX2201 is packaged in a high power 20-pin MLP 4x4 mm miniature surface mount package.