ACT8704 Product Brief, 09-Nov-07 Advanced Information - All Information Subject to Change Four Channel Integrated Power Management IC for Handheld Portable Equipment FEATURES GENERAL DESCRIPTION • Multiple Patents Pending • Li+ Battery Charger with Integrated MOSFET 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. − ON/OFF Control and Status Indication • 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 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. • 4x4mm, Thin-QFN (TQFN44-24) Package − Only 0.75mm Height − RoHS Compliant APPLICATIONS • Portable Devices and PDAs • Digital Media Players • Battery Operated Devices The ACT8704 is available in a tiny 4mm x 4mm 24pin Thin-QFN package that is just 0.75mm thin. • GPS Receivers, etc. SYSTEM BLOCK DIAGRAM VIN CHGLEV Single Cell Li+ Battery Charger nSTAT Battery 100mA/500mA REG1 Step-Down DC/DC OUT1 1.2V to 3.3V Up to 550mA nMSTR nIRQ REG2 System Control nRSTO Step-Down DC/DC ON1 OUT2 1.2V to 3.3V Up to 750mA ON2 REG3 ACT8704 Innovative Products. Active Solutions. ActivePMUTM is a trademark of Active-Semi. Step-Up DC/DC -1- OUT3 WLED Bias www.active-semi.com Copyright © 2007 Active-Semi, Inc. ACT8704 Product Brief, 09-Nov-07 PRODUCT OPTIONS Block Function CHGR Battery Charger REG1 Step-Down DC/DC Output Voltage Capability 4.20V (4.10V to 4.30V available) 100mA/500mA 550mA 1.2V, 1.5V, 1.8V, 2.5V, 3.0V, or 3.3V REG2 Step-Down DC/DC REG3 Step-Up DC/DC 750mA 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 AC Adaptor or USB ACT8704 VIN 4.3V to 6V BAT Li+ Battery + CURRENT SENSE VINUVLO nSTAT 4.0V VOLTAGE SENSE CHARGE STATUS Charge Control OUT2 PRECONDITION 2.9V THERMAL REGULATION 110°C CHGLEV FLOAT VP1 To Battery OUT2 REG1 nRSTO SW1 OUT1 OUT1 GP12 VSYS VP2 To Battery nMSTR REG2 PUSH BUTTON OUT2 SW2 OUT2 OUT2 nIRQ GP12 System Control SW3 ON1 OVP3 REG3 ON2 GA Innovative Products. Active Solutions. To Battery OUT3 -2- FB3 GP3 www.active-semi.com Copyright © 2007 Active-Semi, Inc.