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Texas Instruments BQ29209DRBR — Discrete Semiconductors
Texas Instruments

BQ29209DRBR Battery Protection IC, 2-Cell Li-Ion, 8-SON

MPNBQ29209DRBR
End of Life

Texas Instruments BQ29209DRBR, Battery Protection IC, 2-Cell Lithium Ion, Over Voltage Fault Protection, Surface Mount 8-VDFN Exposed Pad / 8-SON (3x3), -40°C to 110°C, Tape & Reel.

$0.97Ref. price · indicative, final on quote
BQ29209DRBR datasheet
Packaging8-VDFN Exposed Pad
StockContact for availability
MOQ1 pcs
  • 100% new & originalTraceable channels only — no refurbs, no pulls, no remarked parts.
  • Date & lot codes on quoteStated per line before you commit; label photos on request.
  • MSL-compliant ESD packingMoisture-sealed bags with indicator cards; reels photo-verified.
  • PayPal buyer protectionPay by T/T, PayPal or Payoneer — card payments covered end to end.

Specifications

BQ29209DRBR Technical Specifications
ParameterValue
Mounting typeSurface Mount
Operating temperature-40°C ~ 110°C (TA)
PackageTape & Reel (TR); Cut Tape (CT)
FunctionBattery Protection
Case8-VDFN Exposed Pad
Number of cells2
Fault protectionOver Voltage
Battery chemistryLithium Ion

Product details

2S Li-Ion overvoltage guard in a 3x3 SON

The Texas Instruments BQ29209DRBR is a dedicated battery protection IC for two-series (2S) lithium-ion packs. Its primary job is to monitor each cell for overvoltage conditions and disconnect the pack from charge or discharge when a threshold is exceeded. This is a protection-only part — no fuel-gauging, no SMBus communication, no cell balancing. It sits on the cell-stack PCB, wired directly to the pack terminals, and its output drives the charge/discharge FETs. The operating temperature range of -40°C to 110°C (TA) covers industrial and outdoor enclosures, including engine-bay-adjacent equipment and solar-storage cabinets. The 8-SON (3x3) package keeps the footprint small — useful when the protection PCB shares space with the cell interconnect board.

Overvoltage protection — what it means for the BOM

If the BOM calls for a 2S Li-Ion protection IC, this is the correct device class.

Lifecycle and sourcing

ROHS3 compliant.

Frequently asked questions

Can the BQ29209DRBR be used for a 2S LiPo pack?

Yes, the BQ29209DRBR is designed for 2-series (2S) lithium-ion packs. LiPo is a form-factor variant of Li-Ion chemistry, so the protection thresholds are compatible. Verify the overvoltage threshold against your specific cell specification before committing the BOM.