The Texas Instruments BQ294502DRVR is a secondary over-voltage protection IC designed for 2 to 3 series-connected lithium-ion battery packs. It monitors each cell voltage and triggers a fault output if any cell exceeds the over-voltage threshold, providing a hardware safety layer independent of the primary fuel gauge or charger.
Over-voltage protection — what it covers and what it doesn't
The BQ294502DRVR is a dedicated over-voltage protector, not a full-featured battery management IC. It does not include over-current, short-circuit, or under-voltage detection. For designs requiring comprehensive protection (e.g., over-current, temperature monitoring), a companion primary protector or fuel gauge is needed. The over-voltage threshold is factory-programmed; the part is not adjustable in-system, so verify the threshold version matches your cell chemistry (the BQ294502DRVR is one of several fixed-threshold variants in the family).
Package and thermal considerations for layout
It is ROHS3 compliant. There is no official pin-compatible second source from another manufacturer, but the TI BQ2945xx family shares the same footprint with different threshold options — verify the threshold code before substituting.