innovative power tm - 1 - www.active-semi.com copyright ? 2010 active-semi, inc. activepmu tm and activepath tm are trademarks of active-semi. i 2 c tm is a trademark of nxp. product brief, 09-nov-10 ACT8938 advanced pmu for marvell aspen features ? optimized for marvell aspen processors ? three step-down dc/dc converters ? four low-dropout linear regulators ? integrated activepath tm charger ? i 2 c tm serial interface ? advanced enable/disable sequencing controller ? minimal external components ? tiny 55mm tqfn55-40 package ? 0.75mm package height ? pb-free and rohs compliant applications ? personal navigation devices ? portable media players ? tablet devices ? smart phones ? mids general description the ACT8938 is a complete, cost effective, highly efficient activepmu tm power management solution, optimized for the unique power, voltage sequencing, and control requi rements 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 activepath tm 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 high- performance, 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 . typical application diagram ?
ACT8938 product brief, 09-nov-10 a ctive-semi innovative power tm - 2 - www.active-semi.com copyright ? 2010 active-semi, inc. product options block function output voltage capability activepath system power selection 4.6v up to 2a chgr battery charger 4.2v programmable up to 1a reg1 step-down dc/dc adjustable, or 0.6v to 3.9v 1150ma reg2 step-down dc/dc 1150ma reg3 step-down dc/dc 1300ma reg4 ldo 150ma reg5 ldo 150ma reg6 ldo 320ma reg7 ldo 320ma 0.6v to 3.9v functional block diagram reg6 ldo reg7 ldo ACT8938 charge control chgin bat current sense voltage sense 4.35v to 6v ac adaptor usb li + battery body switch sda activepath control system supply vsys body switch 2.85v pre- condition 110c thermal regulation vp2 gp12 sw2 out2 out2 vp1 gp12 sw1 out1 out1 to vsys (optional) th out7 out6 reg5 ldo out5 out7 out6 out5 system control nirq reg4 ldo out4 out4 inl refbp reference acin iset vp3 gp3 sw3 out3 out3 + chglev ga ep nstat charge status vsys to vsys to vsys to vsys npbstat pwrhld pwren scl nrsto vsel nlbo 1.2v - + lbi vsys bat 102a out2 out2 out2 npbin push button vsys
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