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单输出双向电流感测
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Abstract： Battery operated devices often need to monitor both charge and discharge currents. A dual current-sense amplifier and differential amplifier are combined to produce a single output voltage that indicates magnitude and direction of battery current.
Systems such as laptop computers and other devices that have internal charge circuitry require a precise bi-directional current-sense amplifier to monitor accurately the battery‘s current regardless of polarity. The MAX4377 （a dual low-cost current-sense） can be used to produce a bi-directional current monitor.
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