Texas Instruments BQ294682DRVR

Overview

BQ294682DRVR from Texas Instruments is a single-cell secondary overvoltage protector IC for Li-ion battery packs, featuring a factory-programmed 4.225V OVP threshold, 4s fixed delay timer, ±10mV OVP accuracy, <1µA supply current at VCELL < VPROTECT, and low 100nA input leakage per cell. It drives an external N-channel FET to blow a fuse during overvoltage faults in portable tablets and slates.

For engineers reviewing the BQ294682DRVR datasheet, BQ294682DRVR pinout, BQ294682DRVR application, or BQ294682DRVR equivalent, this page delivers verified electrical specs, thermal metrics, functional mode behavior, and real-world implementation guidance for second-level battery protection design.

Technical Context

The BQ294682DRVR operates in NORMAL mode below 4.225V and transitions to OVERVOLTAGE mode when V1 exceeds that threshold for 4 seconds, pulling OUT high to activate an external NMOS FET. Its internal delay timer is fixed-not programmable-and reset occurs only when V1 falls below (4.225V – VHYS), where VHYS is 250–400mV.

It uses unregulated VDD (3–8V) as its power source, senses cell voltage via V1 with RC filtering, and requires both VSS pins connected to the battery's negative terminal. The thermal pad (PWRPAD) must be electrically tied to VSS on the PCB for proper operation and thermal dissipation.

Key Specifications

Pinout & Package

Package: WSON-6 (DRV), 2.0 mm × 2.0 mm body, 0.8 mm max height, thermal pad (PWRPAD) tied to VSS.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BQ294602DRVR and BQ294604DRVR, the BQ294682DRVR provides the lowest OVP threshold (4.225 V) and shortest delay (4 s) in the family-making it optimal for conservative protection schemes targeting early-stage overvoltage detection in standard 4.2V Li-ion cells.

Availability

BQ294682DRVR is available at Aetrix Electronics and suitable for tablet battery packs, slate PC modules, and portable medical instrumentation requiring stable component supply, long-lifecycle support, and automotive-grade temperature resilience.

Supply support for BQ294682DRVR 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, embedded processing, and power management technologies, with leadership in battery management solutions since the 1990s.

The BQ2946xx product line was designed specifically for secondary-level overvoltage protection in single-cell Li-ion battery packs-delivering factory-trimmed accuracy, ultra-low power, and robust thermal performance in compact WSON packages.

FAQ

What is the exact overvoltage protection threshold of the BQ294682DRVR?

The BQ294682DRVR has a factory-programmed overvoltage protection (OVP) threshold of 4.225 V, with ±10 mV accuracy at 25°C and drift within ±54 mV over –40°C to +110°C. This value is fixed and not adjustable via external components or registers.

Does the BQ294682DRVR require external programming or configuration?

No, the BQ294682DRVR is fully factory-configured: its 4.225 V OVP threshold and 4 s delay timer are hard-coded during manufacturing. No external resistors, capacitors, or digital interface are needed-only basic RC filters for V1 and VDD inputs.

How does the BQ294682DRVR reset after triggering overvoltage protection?

The BQ294682DRVR resets its OUT pin to low when the sensed cell voltage (V1) drops below (4.225 V – VHYS), where VHYS is 250–400 mV. This hysteresis prevents oscillation near the trip point and ensures clean recovery once the overvoltage condition is cleared.

Can the BQ294682DRVR drive a MOSFET directly without additional circuitry?

Yes-the BQ294682DRVR's OUT pin delivers VDD – 0.3 V at 100 µA sink/source capability, sufficient to drive common logic-level N-channel MOSFET gates. No level shifter or buffer is required, though layout best practices (short traces, ground plane) are essential.

What is the purpose of the dual VSS pins and thermal pad on the BQ294682DRVR?

Pins 3 and 4 are both VSS and must be externally connected to the battery's negative terminal; the exposed thermal pad (PWRPAD) is internally tied to VSS and must be soldered to a PCB copper pour connected to the same node-ensuring low-impedance grounding and effective heat dissipation during fault events.