The bq77PL157 is a stackable overvoltage protection device for 3, 4, 5 or 6 series cell Li-Ion battery packs. This device incorporates a precise and accurate overvoltage detection circuit with preconfigured threshold limits. Additional features include the ability to stack multiple parts to monitor up to 18 series cells. Preconfigured options include latched (permanent) or recoverable fault output, as well as specific voltage threshold limits selectable in 25 mV steps.