ACT8938

® ACT8938 Product Brief, 09-Nov-10 Advanced PMU for Marvell Aspen FEATURES • • • • • • • • Optimized for Marvell Aspen Processors Three Step-Down DC/DC Converters Four Low-Dropout Linear Regulators Integrated ActivePathTM Charger I2CTM Serial Interface Advanced Enable/Disable Sequencing Controller Minimal External Components Tiny 5×5mm TQFN55-40 Package − 0.75mm Package Height − Pb-Free and RoHS Compliant GENERAL DESCRIPTION The ACT8938 is a complete, cost effective, highly efficient ActivePMUTM power management solution, optimized for the unique power, voltage sequencing, and control requirements of the Marvell Aspen processor. This device features three step-down DC/DC converters and four low-noise, low-dropout linear regulators, along with a complete battery charging solution featuring the advanced ActivePathTM system-power selection function. The three DC/DC converters utilize a high efficiency, fixed-frequency (2MHz), current-mode PWM control architecture that requires a minimum number of external components. Two DC/DCs are capable of supplying up to 1150mA of output current, while the third supports up to 1300mA. All four low-dropout linear regulators are highperformance, low-noise, regulators that supply up to 150mA, 150mA, 320mA and 320mA respectively. The ACT8938 is available in a compact, Pb-Free and RoHS-compliant TQFN55-40 package . APPLICATIONS • • • • • Personal Navigation Devices Portable Media Players Tablet Devices Smart Phones MIDs TYPICAL APPLICATION DIAGRAM Innovative PowerTM ActivePMUTM and ActivePathTM are trademarks of Active-Semi. I2CTM is a trademark of NXP. -1- www.active-semi.com Copyright © 2010 Active-Semi, Inc. Active-Semi PRODUCT OPTIONS Block ActivePath CHGR REG1 REG2 REG3 REG4 REG5 REG6 REG7 Product Brief, 09-Nov-10 ACT8938 Up to 2A Function System Power Selection Battery Charger Step-Down DC/DC Step-Down DC/DC Step-Down DC/DC LDO LDO LDO LDO Output Voltage 4.6V 4.2V Capability Programmable up to 1A 1150mA Adjustable, or 0.6V to 3.9V 1150mA 1300mA 150mA 0.6V to 3.9V 150mA 320mA 320mA FUNCTIONAL BLOCK DIAGRAM (Optional) AC Adaptor USB ACIN BODY SWITCH BODY SWITCH 4.35V to 6V CHGIN ACT8938 VSYS System Supply VSYS ActivePath Control BAT Li+ Battery nSTAT CHARGE STATUS CURRENT SENSE 102µA + TH VOLTAGE SENSE CHGLEV Charge Control PRECONDITION 2.85V VP1 THERMAL REGULATION ISET OUT2 nRSTO To VSYS 110°C SW1 OUT1 OUT1 VSYS nPBIN PUSH BUTTON OUT2 nPBSTAT GP12 VP2 To VSYS SW2 OUT2 OUT2 OUT2 GP12 nIRQ VP3 To VSYS SW3 PWRHLD PWREN VSEL INL To VSYS SCL BAT SDA LBI VSYS nLBO 1.2V + REG6 LDO REG7 LDO REFBP Reference OUT3 System Control OUT3 GP3 REG4 LDO REG5 LDO OUT4 OUT4 OUT5 OUT5 OUT6 OUT6 OUT7 OUT7 GA EP Innovative PowerTM -2- www.active-semi.com Copyright © 2010 Active-Semi, Inc.