BQ34Z100PW

The bq34Z100PW is TI’s impedance‑track gas gauge IC for Li‑ion/Li‑polymer packs (typically 1–4 series cells). It combines a coulomb counter with the Impedance Track algorithm to deliver accurate state of charge (SoC), state of health (SoH), remaining capacity, and predicted run time, while compensating for aging, temperature, and chemistry variations.
Key points:
- Interfaces: I2C with a host microcontroller; uses external current/voltage/temperature sensing and an external sense resistor.
- Features: SoC, SoH, FCC/RemCap estimates; impedance-based aging compensation; calibration/learning cycles; battery health monitoring.
- Protection: configurable safety monitoring (over/under voltage, overcurrent/short-circuit) per pack design.
- Data: non-volatile calibration/chemistry data stored in device memory; supports development with TI tools (e.g., bqStudio).
- Packaging: PW suffix designates the specific package/variant of the device.
Use cases: consumer devices and battery packs requiring accurate gauging and health diagnostics.

Bq34Z100PW uses a 16‑pin VSSOP package (VSSOP-16).

- Pin count: 28 pins (PW package)
- Function: TI bq34Z100PW is a Li‑ion/Li‑polymer battery fuel gauge IC. It monitors pack voltage, current, and temperature, performs Coulomb counting and SOC estimation (ModelGauge), and communicates with a host via SMBus/I2C to provide gauge data and status/alerts for pack management.

- Manufacturer: Texas Instruments (TI).
- What kind of company: TI is an American multinational semiconductor company that designs and manufactures analog, mixed-signal, and embedded processing ICs, sensors, and power-management devices; headquartered in Dallas, Texas.

BQ34Z100PW is a Li‑ion fuel gauge IC used inside battery packs. Typical applications:
- Battery packs for consumer electronics (phones, tablets, cameras)
- Cordless tools and portable appliances
- Medical devices with rechargeable packs
- Wearables and handheld instruments
- Small energy storage/backup packs
It provides SOC/SOH estimation, coulomb counting, voltage/temperature monitoring, and status signaling.

Direct equivalents in TI’s lineup:
- BQ34Z100-R1
- BQ34Z100-G1
These are the same BQ34Z100 gas gauge family (pin-compatible variations). There isn’t a single exact non‑TI cross for drop-in replacement. For similar functionality from other vendors, consider Maxim MAX17043/MAX17044 or TI’s other gauges (e.g., BQ40Z50) depending on pack configuration and interface needs.