What the protection set covers
The fault detection block handles overcurrent during charge and discharge, overvoltage (over-charge), undervoltage (over-discharge), and short-circuit events. That covers the three standard failure modes a single-cell Li-Ion pack needs: cell over-charge, cell over-discharge, and load-side short. There is no integrated FET stage — this is a controller that drives external N-channel MOSFETs, so you size the pass elements for the continuous discharge current your application demands.
Temperature grade and operating range
Rated for -40°C to 85°C ambient, the BQ29729DSET covers the industrial temperature band. That puts it in scope for outdoor telecom battery packs, portable instrumentation, and consumer electronics that might see a hot car interior or cold storage. The 6-WSON package with 1.5 mm x 1.5 mm footprint keeps the BOM area small — useful when the protection circuit has to fit inside the battery housing alongside the cell tabs.
Lifecycle and compliance
The BQ29729DSET carries an Active product status and is ROHS3 compliant. The ROHS3 compliance covers the full substance restriction set, which simplifies export compliance for finished goods shipped into EU or California-regulated markets.
Sourcing posture
For a BOM line that needs a single-cell protector with no end-of-life risk, the BQ29729DSET is a straightforward call — no second-source gymnastics required when the TI catalog lists it as active.