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Texas Instruments BQ4050RSMR — Analog & Data Acquisition

BQ4050RSMR Multi-Function Li-Ion Battery Controller

MPNBQ4050RSMR
End of Life

Texas Instruments BQ4050RSMR multi-function Li-Ion battery controller, 1-4 cells, SMBus interface, 32-VFQFN exposed pad package, -40°C to 85°C.

$6.18Ref. price · indicative, final on quote
Texas Instruments BQ4050RSMR datasheet (PDF)
Packaging32-VFQFN Exposed Pad
RoHSROHS3 Compliant
Independent supplier — new & surplus stockAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

BQ4050RSMR specifications
ParameterValue
MountingSurface Mount
InterfaceSMBus
Operating temperature-40°C ~ 85°C (TA)
PackageTape & Reel (TR); Cut Tape (CT)
FunctionMulti-Function Controller
Case32-VFQFN Exposed Pad
Number of cells1 ~ 4
Fault protectionOver Current, Over Temperature, Over/Under Voltage, Short Circuit
Battery chemistryLithium Ion/Polymer

Product details

Battery pack gauge and protection in one IC

The BQ4050RSMR is a multi-function controller for 1-4 series Li-Ion or Li-Polymer battery packs, integrating fuel gauging, cell balancing, and protection into a single 32-VFQFN package. It communicates over SMBus, so the host system reads state-of-charge, voltage, and temperature data without additional analog front-end circuitry.

Protection coverage and temperature range

Fault protection includes overcurrent, overtemperature, over/under voltage, and short circuit — covering the main failure modes a multi-cell pack sees in charge/discharge cycles.

ROHS3 compliant, with no restricted substances above the threshold limits per EU directive 2015/863.

Frequently asked questions

What is BQ4050RSMR's listed function?

It is a multi-function controller for Li-Ion/Li-Polymer battery packs, handling fuel gauging, cell balancing, and fault protection in a single IC. It communicates over SMBus to the host system.

Will BQ4050RSMR drop into a board designed for BQ296217DSGT?

No — the BQ296217DSGT is a battery protection IC only (over-voltage protection for 2-4 cells), not a multi-function controller. The BQ4050RSMR adds fuel gauging and SMBus communication, so the board layout, firmware, and host interface differ. They are not pin-compatible replacements.