innovative power tm - 1 - www.active-semi.com copyright ? 2011 active-semi, inc. activepmu tm and activepath tm are trademarks of active-semi. i 2 c tm is a trademark of nxp. ACT8939 advanced pmu for freescale i.mx53 processor features ? 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 general description the ACT8939 is a complete, cost effective, highly- efficient activepmu tm power management solution, optimized for the unique power, voltage- sequencing, and control requirements of the freescale i.mx53 processor. it is ideal for a wide range of high performance portable handheld applications such as tablet or pad devices. this device integrates the activepath tm complete battery charging and management system with seven power supply channels. 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 regul ators that supply up to 320ma of output current. the ACT8939 is available in a compact, pb-free and rohs-compliant tqfn55-40 package. typical application diagram ? product brief, 05-dec-11
ACT8939 product brief, 05-dec-11 ? innovative power tm - 2 - www.active-semi.com copyright ? 2011 active-semi, inc. product options block function output voltage capability reg1 step-down dc/dc 0.6v to 3.9v 1150ma reg2 step-down dc/dc 1150ma reg3 step-down dc/dc 1300ma reg4 ldo 0.6v to 3.9v 320ma reg5 ldo 320ma reg6 ldo 320ma reg7 ldo 320ma 0.6v to 3.9v 0.6v to 3.9v 0.6v to 3.9v 0.6v to 3.9v 0.6v to 3.9v functional block diagram reg6 ldo reg7 ldo ACT8939 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 out7 out7 out7 npbin push button vsys
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