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BQ25756: 充电电流及其反馈回路

Part Number: BQ25756

datasheet上说Ichg pin用来设定充电电流的参考值,充电电流指的是流入电池的电流么,此外,充电电流的反馈是从哪儿得到的?是通过RBAT_SNS得到的电流反馈到BQ芯片内部的?RBAT_SNS的阻值为啥要是5mΩ,要是有偏差对电流影响大不大?