ACT8712 Product Brief, 03-Feb-08 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 ACT8712 is a complete, cost effective, highly efficient ActivePMUTM power management solution that is ideal for a wide range of portable hand held equipment. This device integrates two PWM step-down DC/DC converters, one PWM step-up DC/DC converter with over-voltage protection (OVP) and a full-featured linear-mode Li+ battery charger into a single, thin, space-saving package. An I2C Serial Interface provides programmability for the DC/DC converters and battery charger. − ON/OFF Control and Status Indication • Three Integrated Regulators − 550mA Step-Down DC/DC − 750mA Step-Down DC/DC − Step-Up DC/DC with OVP for WLED Bias • I2CTM Compatible Serial Interface − Programmable Output Voltages − Configurable Operating Modes 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 PWM step-up 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. All DC/DC converters’ output voltage and charger current are programmable and controllable via the I2C interface. − Programmable Charger Current • Minimal External Components • 4x4mm, Thin-QFN (TQFN44-24) Package − Only 0.75mm Height − RoHS Compliant APPLICATIONS • Portable Devices and PDAs • UMPC The ACT8712 is available in a tiny 4mm x 4mm 24-pin Thin-QFN package that is just 0.75mm thin. • Battery Operated Devices • GPS Receivers, etc. SYSTEM BLOCK DIAGRAM VIN CHGLEV nSTAT Single Cell Li+ Battery Charger Battery Programmable Up to 1A REG1 Step-Down DC/DC nMSTR OUT1 1.1V to 4.4V Up to 550mA nIRQ nRSTO SCL SDA REG2 System Control Step-Down DC/DC OUT2 1.1V to 4.4V Up to 750mA ON1 ON2 REG3 Step-Up DC/DC ACT8712 ActivePMU Innovative Products. Active Solutions. OUT3 WLED Bias TM -1- www.active-semi.com TM ActivePMU is a trademark of Active-Semi. I2CTM is a trademark of Philips Electronics. Copyright © 2008 Active-Semi, Inc. ACT8712 Product Brief, 03-Feb-08 PRODUCT OPTIONS Block Function Output Voltage CHGR Battery Charger REG1 Step-Down DC/DC REG2 Step-Down DC/DC REG3 Step-up DC/DC Capability 4.20V (4.10V to 4.40V available) Programmable up to 1A 550mA Programmable 1.1V to 4.4V 750mA Programmable 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 ACT8712 VIN 4.3V to 6V BAT Li+ Battery + CURRENT SENSE VINUVLO nSTAT 4.0V VOLTAGE SENSE CHARGE STATUS VIN Charge Control CHGLEV FLOAT PRECONDITION 2.9V THERMAL REGULATION 110°C VP1 To Battery SCL Serial Interface SDA REG1 OUT2 nRSTO SW1 OUT1 OUT1 GP12 VP2 To Battery VSYS REG2 nMSTR PUSH BUTTON OUT2 SW2 OUT2 OUT2 GP12 nIRQ System Control SW3 ON1 OVP3 REG3 ON2 GA Innovative Products. Active Solutions. To Battery OUT3 -2- FB3 GP3 www.active-semi.com Copyright © 2008 Active-Semi, Inc.