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ACT8712 Datasheet(PDF) 1 Page - Active-Semi, Inc |
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ACT8712 Datasheet(HTML) 1 Page - Active-Semi, Inc |
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1 / 36 page  Innovative Products. Active Solutions. - 1 - www.active-semi.com Copyright © 2008 Active-Semi, Inc. ActivePMU TM is a trademark of Active-Semi. I 2CTM is a trademark of Philips Electronics. ACT8712 Four Channel Integrated Power Management IC for Handheld Portable Equipment SYSTEM BLOCK DIAGRAM Pb-free FEATURES • Multiple Patents Pending • Li+ Battery Charger with Integrated MOSFET − Programmable Charge Current up to 1A − 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 • 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. GENERAL DESCRIPTION The patent-pending ACT8712 is a complete, cost effective, highly efficient ActivePMUTM power man- agement solution that is ideal for a wide range of portable handheld equipment. This device inte- grates 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 program- mability for the DC/DC converters and battery charger. REG1 and REG2 are fixed-frequency, current-mode PWM step-down DC/DC converters that are opti- mized for high efficiency and are capable of supply- ing 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 con- stant-current/constant-voltage, thermally regulated charging of a single-cell Li+ battery. All DC/DC con- verters’ output voltage are programmable and con- trollable via the I2C interface. The ACT8712 is available in a tiny 4mm x 4mm 24-pin Thin-QFN package that is just 0.75mm thin. Rev0, 25-Feb-08 Advanced Product Information―All Information Subject to Change ACT8712 ON1 ON2 OUT1 1.1V to 4.4V Up to 550mA nIRQ Single-Cell Li+ Battery Charger VIN System Control nMSTR nRSTO CHGLEV nSTAT Battery Programmable Up to 1A OUT2 1.1V to 4.4V Up to 750mA OUT3 WLED Bias REG1 Step-Down DC/DC REG3 Step-Up DC/DC REG2 Step-Down DC/DC SCL SDA TM PMU PMU Active |
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