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| Product Brief, 09-Nov-07 Advanced Information - All Information Subject to Change ACT8704 Four Channel Integrated Power Management IC for Handheld Portable Equipment FEATURES * Multiple Patents Pending * Li+ Battery Charger with Integrated MOSFET - ON/OFF Control and Status Indication GENERAL DESCRIPTION The patent-pending ACT8704 is a complete, costeffective, highly-efficient ActivePMUTM power management solution that is ideal for a wide range of portable handheld equipment. This device integrates two step-down DC/DC converters for processor core and I/O power, one step-up DC/DC converter with over-voltage protection (OVP) and a fullfeatured, linear-mode Li+ battery charger into a single, thin, space-saving package. REG1 and REG2 are fixed-frequency, current-mode PWM step-down DC/DC converters that are optimized for high efficiency and are capable of supplying up to 550mA and 750mA, respectively. REG3 is a fixed-frequency, step-up DC/DC converter that safely and efficiently biases a string of up to seven white-LEDs for backlighting. The battery charger incorporates an internal power MOSFET for constant-current/constant-voltage, thermally regulated charging of a single-cell Li+ battery. The ACT8704 is available in a tiny 4mm x 4mm 24pin Thin-QFN package that is just 0.75mm thin. * Three Integrated Regulators - 550mA PWM Step-Down DC/DC - 750mA PWM Step-Down DC/DC - Step-Up DC/DC with OVP for WLED Bias * Minimal External Components * 4x4mm, Thin-QFN (TQFN44-24) Package - Only 0.75mm Height - RoHS Compliant APPLICATIONS * Portable Devices and PDAs * Digital Media Players * Battery Operated Devices * GPS Receivers, etc. SYSTEM BLOCK DIAGRAM VIN CHGLEV nSTAT Single Cell Li+ Battery Charger Battery 100mA/500mA REG1 Step-Down DC/DC nMSTR nIRQ nRSTO ON1 ON2 System Control OUT1 1.2V to 3.3V Up to 550mA OUT2 1.2V to 3.3V Up to 750mA REG2 Step-Down DC/DC REG3 ACT8704 Step-Up DC/DC OUT3 WLED Bias Innovative Products. Active Solutions. ActivePMUTM is a trademark of Active-Semi. -1- www.active-semi.com Copyright (c) 2007 Active-Semi, Inc. ACT8704 Product Brief, 09-Nov-07 PRODUCT OPTIONS Block CHGR REG1 REG2 REG3 Function Battery Charger Step-Down DC/DC Output Voltage 4.20V (4.10V to 4.30V available) 1.2V, 1.5V, 1.8V, 2.5V, 3.0V, or 3.3V Capability 100mA/500mA 550mA 750mA Step-Down DC/DC Step-Up DC/DC Up to 27.5V Up to 7 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 VSYS BODY AND VSYS CONTROL ACT8704 BAT Li+ Battery + AC Adaptor or USB 4.3V to 6V VIN VINUVLO CURRENT SENSE VOLTAGE SENSE PRECONDITION nSTAT 4.0V CHARGE STATUS Charge Control 2.9V THERMAL REGULATION OUT2 CHGLEV FLOAT 110C VP1 To Battery OUT2 nRSTO REG1 SW1 OUT1 OUT1 GP12 VSYS nMSTR VP2 To Battery REG2 PUSH BUTTON OUT2 nIRQ SW2 OUT2 OUT2 GP12 System Control SW3 ON1 REG3 ON2 GA OVP3 FB3 GP3 To Battery OUT3 Innovative Products. Active Solutions. -2- www.active-semi.com Copyright (c) 2007 Active-Semi, Inc. |
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