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ACT8712 Dataheets PDF



Part Number ACT8712
Manufacturers Active-Semi
Logo Active-Semi
Description Four Channel Integrated Power Management IC
Datasheet ACT8712 DatasheetACT8712 Datasheet (PDF)

Rev0, 25-Feb-08 Advanced Product Information―All Information Subject to Change ACT8712 Four Channel Integrated Power Management IC for Handheld Portable Equipment FEATURES • Multiple Patents Pending • Li+ Battery Charger with Integrated MOSFET − Programmable Charge Current up to 1A − ON/OFF Control and Status Indication GENERAL DESCRIPTION The patent-pending ACT8712 is a complete, cost effective, highly efficient ActivePMUTM power management solution that is ideal for a wide range of portable.

  ACT8712   ACT8712


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Rev0, 25-Feb-08 Advanced Product Information―All Information Subject to Change ACT8712 Four Channel Integrated Power Management IC for Handheld Portable Equipment FEATURES • Multiple Patents Pending • Li+ Battery Charger with Integrated MOSFET − Programmable Charge Current up to 1A − ON/OFF Control and Status Indication GENERAL DESCRIPTION The patent-pending ACT8712 is a complete, cost effective, highly efficient ActivePMUTM power management solution that is ideal for a wide range of portable handheld 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. 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 are programmable and controllable 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. • 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. SYSTEM BLOCK DIAGRAM VIN CHGLEV nSTAT nMSTR nIRQ nRSTO SCL SDA ON1 ON2 Single-Cell Li+ Battery Charger Battery Programmable Up to 1A REG1 Step-Down DC/DC System Control OUT1 1.1V to 4.4V Up to 550mA OUT2 1.1V to 4.4V Up to 750mA REG2 Step-Down DC/DC Pb-free ACT8712 Active REG3 Step-Up DC/DC PMU TM OUT3 WLED Bias Innovative Products. Active Solutions. ActivePMUTM is a trademark of Active-Semi. I2CTM is a trademark of Philips Electronics. -1- www.active-semi.com Copyright © 2008 Active-Semi, Inc. Free Datasheet http://www.datasheet4u.com/ ACT8712 TABLE OF CONTENTS GENERAL INFORMATION ...................................................................................... P. 01 Functional Block Diagram .................................................................................................. p. 03 Ordering Information .......................................................................................................... p. 04 Pin Configuration ............................................................................................................... p. 04 Pin Descriptions ................................................................................................................. p. 05 Absolute Maximum Ratings ............................................................................................... p. 07 Rev0, 25-Feb-08 SYSTEM MANAGEMENT ....................................................................................... P. 08 Register Descriptions ......................................................................................................... p. 08 Electrical Characteristics .................................................................................................... p. 09 I2C Interface Electrical Characteristics ............................................................................... p. 10 Typical Performance Characteristics ................................................................................. p. 11 Functional Description ....................................................................................................... p. 12 STEP-DOWN DC/DC CONVERTERS ...................................................................... P. 14 Electrical Characteristics ................................................................................................... p. 14 Register Descriptions ......................................................................................................... p. 15 Typical Performance Characteristics ................................................................................. p. 20 Functional Description ....................................................................................................... p. 21 WLED BIAS DC/DC CONVERTER ......................................................................... P. 23 Electrical Characteristics .................................................................................................... p. 23 Register Descriptions .........................


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