ACT3780

Active-Semi FEATURES Product Brief, 29-May-08 Advanced Information―All Information Subject to Change ACT3780 ActivePathTM Battery Charger GENERAL DESCRIPTION The ACT3780 is a complete battery charging and management solution for one cell Lithium-Ion or Lithium-Polymer battery. The ACT3780 incorporates the ActivePath architecture which automatically selects the best available input supply for the system. When an external power source such as an AC adapter or a USB port is connected in, the ACT3780 regulates the system voltage to 4.8V in addition to providing charging current to the battery. If the external input source is not present or the system load current is more than the input source can provide, the ActivePath supplies additional current from the battery to the system. The ACT3780 charger is a complete, thermally regulated, stand-alone single cell linear Li+ charger that integrates an internal power 12V MOSFET. The battery regulation voltage is ±0.5% accurate, and is factory programmed from 4.2V (other voltages available upon request). The ACT3780 is available in an thermally enhanced 4mm x 4mm Thin-QFN and 3.5mm × 4.5mm ThinDFN 20-pin packages. ActivePathTM System Power Selection of Best Available Input Supply 40mΩ Battery Switch for Highest Efficiency Dynamic Control of Charging Current Allowing System to Draw Maximum Load from AC/USB Input ±0.5% Battery Voltage Accuracy Up to 12V Input Thermal Regulation for Charge Control Charge Sta...