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| Active-Semi FEATURES Six Functions Integrated Into One Package: Product Brief, 12-Mar-09 Advanced InformationAll Information Subject to Change 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. Tiny 5mm x 5mm 40-pin Thin-QFN package that is just 0.75mm thin. 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 x 3p WLEDs TM 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 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 ON3 ON4 VSEL System Control Li+ Battery Programmable Up to 1A VSYS REG1 Step-Down DC/DC REG2 Step-Down DC/DC REG3 Step-Down DC/DC REG4 Step-Up DC/DC 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 ActivePath & Single-Cell Li+ Battery Charger TM ACT8828 Active PMU TM Innovative PowerTM ActivePMUTM and ActivePathTM are trademarks of Active-Semi. I2CTM is a trademark of Philips Electronics. -1- www.active-semi.com Copyright (c) 2009 Active-Semi, Inc. Active-Semi PRODUCT OPTIONS Block ActivePath CHGR REG1 REG2 REG3 REG4 Product Brief, 12-Mar-09 ACT8828 Function System Power Selection Battery Charger Step-Down DC/DC Step-Down DC/DC Step-Down DC/DC Step-Up DC/DC Output Voltage 4.6V 4.20V (4.10V to 4.30V available) Adjustable, or 0.8V to 4.4V Capability Up to 2.4A Programmable up to 1A 1.3A 1.0A 0.55A Up to 30V Up to 7s x 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 (Optional) AC Adaptor USB BODY SWITCH CHG_IN Up to 12V BODY SWITCH ACT8828 VSYS System Supply ACIN BAT DCCC VSYS ActivePath Control CURRENT SENSE Li+ Battery + TH nSTAT CHARGE STATUS VOLTAGE SENSE PRECONDITION 2.9V ISET VSYS CHGLEV OUT1 nRSTO SW1 REG1 OUT1 OUT1 GP1 VP2 nIRQ SW2 REG2 OUT2 OUT2 GP2 VP3 VSYS nPBIN PUSH BUTTON OUT1 To VSYS VP1 To VSYS Charge Control THERMAL REGULATION BTR 110C SCL SDA ON1 ON2 ON3 ON4 System Control REG3 To VSYS SW3 OUT3 OUT3 GP3 SW4 OVP4 REG4 FB4 GP4 To VSYS OUT4 7s x 3p WLEDs VSEL REFBP Reference GA EP Innovative PowerTM -2- www.active-semi.com Copyright (c) 2009 Active-Semi, Inc. |
Price & Availability of ACT8828
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