BQ27750DRZR

BQ27750DRZR is TI’s battery fuel gauge IC for Li-ion/Li-poly packs, using Impedance Track to provide accurate SOC/SoH and remaining capacity for 1–4 cells. It is designed to sit in the pack and interface with a host MCU over I2C/SMBus.
Key points
- Reads cell voltage, current (via external sense resistor), temperature; estimates SOC, remaining capacity, runtime, and SOH.
- Uses coulomb counting plus impedance-tracking model to adapt to aging and temperature.
- Features include auto-calibration, fault detection, data logging, and register-level access for calibration and monitoring.
- Host interface: I2C/SMBus; suitable for BMS or pack-level protection systems.
- Package suffix DRZR denotes a specific TI package/variant; refer to the datasheet for exact pinout and temperature range.
Typical use
- In battery packs for appliances, tools, laptops, and portable devices requiring accurate fuel gauging and battery health monitoring.
Note: Always consult the TI datasheet for exact electrical specs, package details, and recommended circuit schematics.

Here are the key features of the BQ27750DRZR:
- Impedance Track-based gas gauge for accurate SOC and SoH estimates across aging and temperature
- Coulomb counting with automatic capacity (Qmax) learning and calibration
- Measures and reports voltage, current, temperature; includes dynamic impedance measurements
- SMBus/I2C digital interface to host MCU; programmable alerts/interrupt outputs
- On-chip nonvolatile memory for calibration data and an open-circuit voltage (OCV) model
- Suitable for Li-ion/Li-poly packs; supports multi-cell configurations configured by host
- Safety monitoring with fault reporting: over/under voltage, over-current/short-circuit, high temperature
- Low quiescent current and power-saving sleep modes; fast response to load changes
- 28-pin DRZR package (RoHS-compliant)

- Pin count: 16 pins (VQFN/SON package, DRZR variant).
- Function: TI bq27750 is a Li‑ion battery fuel gauge (Impedance Track) for single‑cell packs; provides coulomb counting, voltage, current, and temperature sensing, SOC estimation, and communicates via I2C/SMBus to the host.

- Manufacturer: Texas Instruments Incorporated (TI).
- What kind of company: An American multinational semiconductor company that designs, manufactures, and sells analog and embedded processing integrated circuits and related components.

BQ27750DRZR is a Li‑ion battery fuel gauge IC (Impedance Track) used inside smart battery packs. Typical application areas include:
- Portable consumer electronics (phones, tablets, cameras, wearables)
- Notebook and rugged handheld devices
- Cordless power tools and other industrial equipment
- Medical devices with removable Li‑ion packs
- IoT and wireless sensor nodes
- Energy storage/backup power systems using Li‑ion packs

8-pin WSON (3×3 mm) package, RoHS-compliant.