FEATURES
● ActivePathTM Li+ Charger with System Power Selection ACT8828 Rev 3, 24-Sep-09 Six Channel ActivePathTM Power Management IC GENERAL DESCRIPTION
The patent-pending 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 charger is a complete, thermallyregulated, stand-alone single-cell linear Li+ charger that incorporates an internal power MOSFET. REG1, REG2, and REG3 are three independent, fixed-frequency, current-mode step-down DC/DC converters that output 1.3A, 1.0A, and 0.55A, respectively. REG4 is a fixed-frequency, step-up DC/DC converter that safely and efficiently biases strings of up to 7 white-LEDs (up to a total of 21 LEDs) for display backlight applications. Finally, an I2C serial interface provides programmability for the DC/DC converters. The ACT8828 is available in a tiny 5mm × 5mm 40pin Thin-QFN package that is just 0.75mm thin.
Active-Semi
