BQ34Z100PW

The BQ34Z100PW is Texas Instruments’ gas gauge (fuel gauge) IC for Li‑ion/Li‑polymer battery packs. It estimates State of Charge (SOC), remaining capacity, and State of Health (SOH), and it provides protection features (e.g., overcurrent).
Key features:
- Coulomb counting with programmable current sense plus voltage and temperature sensing
- Impedance-tracking auto-learning to adapt the gauge to the cell’s characteristics for improved SOC accuracy
- On‑chip nonvolatile memory for gauge firmware/calibration data
- SMBus/I2C communication to a host microcontroller
- Pack-level sensing with required external components (sense resistor, thermistor, etc.)
Package/variants:
- PW suffix denotes a specific TI packaging option suitable for integration in battery packs or capacitor boards.
Typical use:
- In single- or multi-cell Li‑ion/Li‑polymer packs, providing SOC/SOH data to the host and enabling battery protection, with appropriate gauge firmware and development tools from TI.

There isn’t an exact drop-in cross reference for BQ34Z100PW. Closest equivalent fuel gauges by function are:
- TI: BQ27441-G1 (and related 274xx family)
- Maxim: MAX17043, MAX17044
- STMicroelectronics: STC3100
- Renesas: ISL94202 (and related)
Note: equivalents depend on pack chemistry (1S–4S), interface (I2C/SMBus), coulomb counting, and required features. Contact TI for recommended replacements based on your design.

- Pin count: 24 pins (Pkg: 24‑pin device)
- Function: Battery fuel gauge (gas gauge) IC for Li‑ion/Li‑poly packs. Provides coulomb counting, voltage/current/temperature sensing, state-of-charge/state-of-health estimation, and SMBus/I2C communication with the host or system, plus onboard battery profiling data.

Manufacturer: Texas Instruments Incorporated (TI).
What kind of company: TI is an American multinational semiconductor company that designs and manufactures a wide range of integrated circuits and electronics components, with a focus on analog, power management, embedded processing, and battery-management ICs (such as the bq34z100 family).

BQ34Z100PW is TI’s impedance-track gas gauge for Li-Ion/Li-Polymer packs. Typical applications:
- Portable consumer electronics (smartphones, tablets, cameras, wearables)
- Cordless tools and hobby devices
- Portable medical devices and health-monitoring gear
- IoT/wireless sensors and other battery-powered equipment
- Power banks and backup batteries
- Industrial battery packs and field equipment
It provides accurate state-of-charge, capacity, and health data for safer, longer-lasting packs.

The bq34Z100PW uses a PW package, which is a 20-pin TI Thin Shrink Small-Outline Package (TSSOP).