Monolithic PMIC Packs Reinforced Isolation

Allegro MicroSystems’ ACS71020 small form factor, power monitoring IC (PMIC) with reinforced voltage isolation adds line voltage sensing to voltage levels > 500 VRMS and a dedicated metrology engine that digitally calculates detected power levels. This enables the first PMIC that can be powered from the same voltage supply as the system microprocessor, without needing digital isolators or multiple power supplies.


The device offers digital computation of parameters including active, reactive, and apparent power. These power values can be read through I²C or SPI. The IC also includes dedicated pins for voltage zero crossing (suitable for light-dimming applications) and fast overcurrent fault detection (for sensing short-circuits). The ACS71020 eliminates the need for opto-couplers, dual output isolated power supplies and a current sense-resistor in single phase power monitoring applications.

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The ACS71020 is housed in a single SOIC-16 wide body package that provides a reinforced isolation rating up to 517 Vrms. It is programmed at the factory for accuracy measurement to either ±15A, ±30A, or ±90A, and is priced at $1.79 each/1,000. For more details, visit the ACS71020 product brief and download the ACS71020 datasheet.

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