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Texas Instruments BQ27742YZFR-G1 — Power Management (PMIC / Gate Driver)

BQ27742YZFR-G1 Li-Ion Battery Fuel Gauge, 15-DSBGA

MPNBQ27742YZFR-G1
Active

Texas Instruments BQ27742YZFR-G1, Multi-Function Controller for single-cell Li-Ion battery fuel gauging, HDQ/I2C interface, 15-DSBGA package, -40°C to 85°C operating temperature, overcurrent/overvoltage/undervoltage/short-circuit fault protection.

$2.8400Ref. price · indicative, final on quote
Texas Instruments BQ27742YZFR-G1 datasheet (PDF)
Packaging15-UFBGA, DSBGA
RoHSROHS3 Compliant
Independent supplier — new & surplus stockAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

BQ27742YZFR-G1 specifications
ParameterValue
MountingSurface Mount
InterfaceHDQ, I2C
Operating temperature-40°C ~ 85°C (TA)
PackageTape & Reel (TR) Cut Tape (CT)
FunctionMulti-Function Controller
Case15-UFBGA, DSBGA
Number of cells1
Fault protectionOver Current, Over/Under Voltage, Short Circuit
Battery chemistryLithium Ion

Product details

Single-cell fuel gauge with integrated protection

The Texas Instruments BQ27742YZFR-G1 is a multi-function controller designed as a battery fuel gauge for single-cell Lithium Ion packs. It communicates over HDQ or I2C, and integrates overcurrent, over/under voltage, and short-circuit fault protection to reduce external component count.

Temperature range and application environment

The 15-DSBGA is a fine-pitch wafer-level package with no exposed thermal pad. Reflow profile follows standard BGA guidelines; X-ray inspection is recommended after assembly to confirm solder-joint integrity. The small footprint (approx 2.5 mm²) means decoupling caps sit tight — plan for 0402 or 0201 passives on the same side.

Frequently asked questions

Is BQ27742YZFR-G1 compatible with a 2-cell battery?

No. The BQ27742YZFR-G1 is specified for single-cell (1-series) Lithium Ion packs only. For 2- to 4-cell designs, consider the BQ2084DBT-V143, which supports multi-cell stacks.

What is the difference between BQ27742YZFR-G1 and BQ27741?

The BQ27741 is a close sibling sharing the same single-cell Li-Ion fuel gauge function and DSBGA package. The primary difference is firmware tuning and algorithm — the BQ27742 includes updated Impedance Track™ chemistry profiles. Both use HDQ/I2C and the same pinout, but the BQ27742 is the current active recommendation for new designs.

What battery chemistry does BQ27742YZFR-G1 support?

It is designed for Lithium Ion chemistry only. The fuel gauge algorithm is optimized for Li-Ion voltage and discharge curves.

What is the interface type for BQ27742YZFR-G1?

The BQ27742YZFR-G1 supports both HDQ (single-wire) and I2C (two-wire) host interfaces, selectable by configuration.