innovative power tm - 1 - www.active-semi.com copyright ? 2011 active-semi, inc. activepmu tm is a trademark of active-semi. i 2 c tm is a trademark of nxp. ACT8891 advanced pmu for rockchip rk2918 processor features ? optimized for rockchip rk2918 processor ? three step-down dc/dc converters ? four low-dropout linear regulators ? i 2 c tm serial interface ? advanced enable/disable sequencing controller ? minimal external components ? tiny 44mm tqfn44-32 package ? 0.75mm package height ? pb-free and rohs compliant general description the ACT8891 is a complete, cost effective, highly- efficient activepmu tm power management solution, optimized for the unique power, voltage- sequencing, and control requirements of the rockchip rk2918 processor. this device features three step-down dc/dc converters and four low-noise, low-dropout linear regulators. 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 support up to 320ma. the ACT8891 is available in a compact, pb-free and rohs-compliant tqfn44-32 package. system blo ck diagram ? product brief, 05-dec-11
ACT8891 product brief, 05-dec-11 ? innovative power tm - 2 - www.active-semi.com copyright ? 2011 active-semi, inc. reg6 ldo reg7 ldo ACT8891 sda vp2 gp2 sw2 out2 out2 vp1 gp1 sw1 out1 out1 to battery out7 out6 reg5 ldo out5 out7 out6 out5 system control nirq reg4 ldo out4 out4 inl45 refbp reference vp3 gp3 sw3 out3 out3 ga ep to battery to battery to battery npbstat pwrhld scl vsel out1 out1 npbin push button vddref serial interface nrsto out1 inl67 to battery to battery vddref a ctive-semi 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
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