2-cell Li-ion balancer with I²C and integrated fault protection
The BQ25887RGET is a Texas Instruments 2-cell lithium-ion battery balancer in a 24-VQFN (4x4 mm) package. It uses an I²C interface to set balancing thresholds and report fault conditions — overvoltage, overcurrent, and overtemperature are all handled on-chip.
The 2-cell limit is non-negotiable: this part balances exactly two series lithium-ion cells. For a single-cell pack you would need a different balancer or a monitor like the BQ79612PAPRQ1, which handles one cell but adds SPI/UART and AEC-Q100 qualification. For 3–4 cells the older BQ2084DBT-V143 uses SMBus and covers 2 to 4 cells, but its temperature range stops at 85°C and it comes in a tube package. The I²C interface lets a host microcontroller read fault status and adjust the balancing current or voltage thresholds on the fly — useful if the pack chemistry or aging profile changes over the product lifetime.
Active production — no lifecycle concern
For current BOMs, there is no pressure to last-time-buy or find a drop-in replacement. Confirm the 24-VQFN (4x4) footprint and the I²C bus voltage level before committing the layout.