Six Channel ActivePath Power Management IC
Description
Active-Semi
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 ACT8828 is a complete, cost effective, highly-efficient ActivePMUTM power management solution that is ideal for a wide range of high performance portable handheld applications such as personal navigation devices (PNDs).
This device integrates the ActivePath complete battery charging and management system with four power supply channels.
The ActivePath architecture automatically selects the best available input supply for the system.
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.
• Four Integrated Regulators:
− 1.
3A High Efficiency Step-Down DC/DC − 1.
0A High Efficiency Step-Down DC/DC − 0.
55A High Efficiency Step-Down DC/DC − 30V Step-Up DC/DC for up to 7s × 3p WLEDs
• • • •
I2CTM Serial Interface Minimal External Components Compatible with USB or AC-Adapter Charging 5×5mm, Thin-QFN (TQFN55-40) Package − Only 0.
75mm Height − RoHS Compliant
APPLICATIONS
• Personal Navigation Devices • Portable Media Players • Smart Phones
SYSTEM BLOCK DIAGRAM
CHG_IN CHGLEV DCCC ISET ACIN nSTAT nPBIN nIRQ nRSTO SCL SDA ON1 ON2 O...
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