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ACT8828 Datasheet(PDF) 1 Page - Active-Semi, Inc |
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ACT8828 Datasheet(HTML) 1 Page - Active-Semi, Inc |
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1 / 49 page  Innovative Power TM - 1 - www.active-semi.com Copyright © 2009 Active-Semi, Inc. ActivePMU TM and ActivePathTM are trademarks of Active-Semi. I 2CTM is a trademark of Philips Electronics. Rev 3, 24-Sep-09 ACT8828 SYSTEM BLOCK DIAGRAM Active-Semi Six Channel ActivePath TM Power Management IC FEATURES • ActivePathTM Li+ Charger with System Power Selection • 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 GENERAL DESCRIPTION The patent-pending ACT8828 is a complete, cost effective, highly-efficient ActivePMU TM 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, thermally- regulated, 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 40- pin Thin-QFN package that is just 0.75mm thin. OUT3 Adjustable, or 0.8V to 4.4V Up to 0.55A OUT4 Up to 30V 7s x 3p WLEDs System Control nIRQ ON1 ON4 ON2 nPBIN ActivePath TM & Single-Cell Li+ Battery Charger Li+ Battery Programmable Up to 1A VSYS CHG_IN CHGLEV DCCC OUT2 Adjustable, or 0.8V to 4.4V Up to 1.0A nSTAT ACIN nRSTO SCL SDA VSEL ISET REG3 Step-Down DC/DC REG4 Step-Up DC/DC REG2 Step-Down DC/DC OUT1 Adjustable, or 0.8V to 4.4V Up to 1.3A REG1 Step-Down DC/DC ACT8828 TM PMU PMU Active ON3 |
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Similar Description - ACT8828 |
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