ACT8847

ACT8847 Product Brief, 05-Dec-12 Advanced PMU for Multi-core Application Processors FEATURES INTEGRATED POWER SUPPLIES GENERAL DESCRIPTION The ACT8847 is a complete, cost effective, and highly-efficient ActivePMUTM power management solution optimized for the power, voltage sequencing and control requirements of Samsung Exynos 4210 (S5PC210/S5PV310) and other application processors. (Please See Ordering Information Section and its Appendix.) The ACT8847 features four fixed-frequency, current-mode, synchronous PWM step-down converters that achieve peak efficiencies of up to 97%. These regulators operate with a fixed frequency of 2.25MHz, minimizing noise in sensitive applications and allowing the use of small external components. These buck regulators supply up to 2.8A of output current and can fully satisfy the power and control requirements of the multi-core application processor. Dynamic Voltage Scaling (DVS) is supported either by dedicated control pins, or through I2C interface to optimize the energy-pertask performance for the processor. This device also include eight low-noise LDOs (up to 350mA per LDO), one always-ON LDO and an integrated backup battery charger to provide a complete power system for the processor. The power sequence and reset controller provides power-on reset, SW-initiated reset, and power cycle reset for the processor. It also features the watchdog supervisory function. Multiple sleep modes with autonomous sleep and wake-up sequence control are supp...