基于A(yíng)CT8937設計的高效7路DC電源技術(shù)

The ACT8937 is a complete, cost effective, highlyefficient ActivePMUTM power management solution, optimized for the unique power, voltagesequencing, and control requirements of the Samsung S5PC100, S5PC110 and S5PV210 processors.

The ACT8937 is available in a compact, Pb-Free and RoHS-compliant TQFN55-40 package.

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 highefficiency, 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 900mA of output current, while the third supports up to 700mA. All four lowdropout linear regulators are high-performance, low-noise, regulators that supply up to 150mA, 150mA, 250mA, and 250mA, respectively.

ACT8937主要特性：

? Optimized for Samsung S5PC100, S5PC110 and S5PV210 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

圖1。ACT8937功能方框圖

圖2。ACT8937典型應用框圖