Texas Instruments BQ294592DRVR

Overview

BQ294592DRVR from Texas Instruments is a secondary overvoltage protection IC for 2- or 3-series Li-ion battery packs, featuring fixed 4.3 V OVP threshold, ±10 mV accuracy, and 4 s fault detection delay. It independently monitors each cell voltage and drives an external N-channel FET to trigger fuse blow during overvoltage events in portable power tools and notebook computers.

For engineers reviewing the BQ294592DRVR datasheet, BQ294592DRVR pinout, BQ294592DRVR application, or BQ294592DRVR equivalent, key selection criteria include OVP threshold tolerance, low ICC (≈1 µA), per-cell input leakage (<100 nA), thermal pad grounding requirement, and compatibility with 2-/3-cell stack configurations.

Technical Context

The BQ294592DRVR implements independent analog sensing of V1–VSS, V2–V1, and V3–V2 via internal multiplexer, comparing each differential voltage against its factory-programmed 4.3 V overvoltage threshold. Detection triggers a fixed 4 s delay timer before asserting high-level OUT signal.

Its functional architecture includes integrated oscillator for timing, hysteresis (250–400 mV) to prevent chatter, and output drive capable of sourcing ≥4.5 mA into shorted load while maintaining VOH ≥ VDD – 0.2 V across –40°C to +110°C ambient.

Key Specifications

Pinout & Package

Package: 6-pin WSON (DRV), 2.00 mm × 2.00 mm body size, with exposed thermal pad (PWRPAD) requiring connection to VSS on PCB for proper thermal and electrical performance.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar overvoltage protection applications.

Compared with BQ294592DRVR, BQ294502DRVR raises the OVP threshold by 50 mV for tighter control on mature Li-ion cells, while BQ294522DRVR increases it by 150 mV to accommodate higher-voltage chemistries - both retain identical timing, leakage, and package compatibility.

Availability

BQ294592DRVR is available at Aetrix Electronics and suitable for notebook computers, power tools, and portable medical instruments requiring stable component supply, long-term lifecycle support, and automotive-qualified reliability in battery management systems.

Supply support for BQ294592DRVR includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Texas Instruments is a global semiconductor company specializing in analog and embedded processing technologies, with leadership in battery management, power conversion, and precision analog ICs.

The BQ2945xy family was designed specifically for secondary overvoltage protection in multi-cell Li-ion battery packs, delivering factory-trimmed accuracy, ultra-low power, and robust fault response without external timing components.

FAQ

What is the exact overvoltage protection threshold of the BQ294592DRVR?

The BQ294592DRVR has a factory-programmed overvoltage protection threshold of 4.3 V with ±10 mV accuracy at 25°C. This value is fixed and not adjustable; it remains stable across temperature with drift bounded by ±54 mV from –40°C to +110°C as specified in the electrical characteristics table.

Does the BQ294592DRVR support both 2-cell and 3-cell Li-ion battery configurations?

Yes, the BQ294592DRVR supports both 2-series and 3-series Li-ion battery configurations. For 2-cell use, the V3 pin is shorted to V2; for 3-cell use, V1, V2, and V3 are connected to the respective cell positives. All configurations share the same 4.3 V OVP threshold and 4 s delay.

How does the BQ294592DRVR drive the external MOSFET during overvoltage events?

The BQ294592DRVR drives the gate of an external N-channel MOSFET via its open-drain–compatible OUT pin, which pulls high after detecting overvoltage for 4 s. The output sources ≥4.5 mA and maintains VOH ≥ VDD – 0.2 V, ensuring reliable FET turn-on to activate the fuse-blow path.

Is the thermal pad (PWRPAD) on the BQ294592DRVR required to be connected?

Yes, the PWRPAD on the BQ294592DRVR must be electrically and thermally connected to the VSS net on the PCB. TI specifies this as mandatory for correct operation - it serves as both a low-impedance ground return and thermal dissipation path, and omission causes functional instability or failure.

What is the supply current consumption of the BQ294592DRVR under normal operating conditions?

The BQ294592DRVR consumes approximately 1 µA of supply current (ICC) when all cell voltages remain below the 4.3 V OVP threshold. This ultra-low quiescent current is maintained across the full operating temperature range (–40°C to +110°C) and enables multi-year battery shelf life in always-connected protection circuits.