Active-Semi Product Brief, 12-Mar-09 Advanced Information―All Information Subject to Change Six Channel ActivePathTM Power Management IC FEATURES GENERAL DESCRIPTION Six Functions Integrated Into One Package: 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. ActivePath Li+ Charger and System Power Selection 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 TM 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. I2CTM Serial Interface Minimal External Components Compatible with USB or AC-Adapter Charging 55mm, Thin-QFN (TQFN55-40) Package Only 0.75mm Height RoHS Compliant 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. APPLICATIONS Personal Navigation Devices Portable Media Players Smart Phones Tiny 5mm × 5mm 40-pin Thin-QFN package that is just 0.75mm thin. SYSTEM BLOCK DIAGRAM CHG_IN CHGLEV DCCC ISET ACIN nSTAT Li+ Battery Programmable Up to 1A VSYS TM ActivePath & Single-Cell Li+ Battery Charger REG1 Step-Down DC/DC REG2 Step-Down DC/DC nPBIN nIRQ nRSTO REG3 Step-Down DC/DC SCL SDA ON1 System Control REG4 Step-Up DC/DC ON2 ON3 ON4 ACT8828 PMU VSEL Innovative PowerTM ActivePMUTM and ActivePathTM are trademarks of Active-Semi. I2CTM is a trademark of Philips Electronics. Active -1- OUT1 Adjustable, or 0.8V to 4.4V Up to 1.3A OUT2 Adjustable, or 0.8V to 4.4V Up to 1.0A OUT3 Adjustable, or 0.8V to 4.4V Up to 0.55A OUT4 Up to 30V 7s x 3p WLEDs TM www.active-semi.com Copyright © 2009 Active-Semi, Inc. ACT8828 Active-Semi Product Brief, 12-Mar-09 PRODUCT OPTIONS Block Function Output Voltage Capability ActivePath System Power Selection 4.6V Up to 2.4A CHGR Battery Charger 4.20V (4.10V to 4.30V available) Programmable up to 1A REG1 Step-Down DC/DC REG2 Step-Down DC/DC REG3 Step-Down DC/DC REG4 Step-Up DC/DC 1.3A Adjustable, or 0.8V to 4.4V 1.0A 0.55A Up to 30V Up to 7s × 3p WLEDs : Output voltage options detailed in this table represent standard voltage options, and are available for samples or production orders. Contact Active-Semi for more information regarding semi-custom output voltage combinations. : Contact factory for additional available products or custom requirements. FUNCTIONAL BLOCK DIAGRAM BODY SWITCH (Optional) CHG_IN Up to 12V AC Adaptor USB ACT8828 VSYS System Supply BODY SWITCH ACIN BAT Li+ Battery DCCC ActivePath Control VSYS + TH CURRENT SENSE nSTAT VOLTAGE SENSE PRECONDITION CHARGE STATUS 2.9V Charge Control ISET THERMAL REGULATION BTR 110°C VSYS CHGLEV OUT1 VP1 To VSYS nRSTO REG1 SW1 VSYS nPBIN OUT1 OUT1 GP1 PUSH BUTTON OUT1 VP2 nIRQ To VSYS REG2 SW2 OUT2 OUT2 GP2 SCL VP3 SDA To VSYS System Control SW3 REG3 ON1 ON2 OUT3 OUT3 ON3 GP3 ON4 SW4 OVP4 REG4 VSEL REFBP Reference FB4 To VSYS OUT4 7s × 3p WLEDs GP4 GA EP Innovative PowerTM -2- www.active-semi.com Copyright © 2009 Active-Semi, Inc.