Texas Instruments BQ294592DRVT

Overview

BQ294592DRVT 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, 4 s fault detection delay, 1 µA quiescent current, and 6-pin SON package. 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 BQ294592DRVT datasheet, BQ294592DRVT pinout, BQ294592DRVT application, or BQ294592DRVT equivalent, key selection criteria include OVP threshold tolerance, delay timer stability across –40°C to +110°C, leakage current per cell input (<100 nA), thermal pad (PWRPAD) connection requirement, and compatibility with 2-/3-cell stack configurations using discrete RC filtering on V1/V2/V3 inputs.

Technical Context

The BQ294592DRVT implements independent analog voltage sensing per cell via a multiplexer network, comparing each differential cell voltage (V1–VSS, V2–V1, V3–V2) against a factory-programmed 4.3 V overvoltage threshold. Detection triggers a fixed 4 s delay timer before asserting the open-drain OUT pin high to drive an external NMOS gate.

It operates from 3 V to 25 V supply (VDD), supports –40°C to +110°C ambient, and requires PCB-level connection of the thermal pad (PWRPAD) to VSS for functional reliability. The device enters Customer Test Mode (CTM) when VDD exceeds V3 by ≥10 V, reducing delay to >15 ms for production test acceleration.

Key Specifications

Pinout & Package

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

Key Features

Applications

Equivalent & Alternatives

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

Compared with BQ294592DRVT, BQ294502DRVT raises the OVP threshold by 50 mV for higher-voltage cells, while BQ294522DRVT increases it by 150 mV-both retain identical timing, leakage, and thermal behavior, enabling direct substitution when threshold adjustment is the sole requirement.

Availability

BQ294592DRVT is available at Aetrix Electronics and suitable for battery management systems in power tools, notebook computers, tablets, and portable medical instruments requiring stable component supply, long-term lifecycle support, and guaranteed traceability.

Supply support for BQ294592DRVT 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 ICs and industrial-grade signal chain solutions.

The BQ2945xy family was designed specifically for secondary overvoltage protection in multi-cell Li-ion battery packs, delivering factory-trimmed precision, ultra-low power consumption, and robust operation across extended temperature ranges.

FAQ

What is the exact overvoltage protection threshold and accuracy of the BQ294592DRVT?

The BQ294592DRVT has a factory-programmed overvoltage protection threshold of 4.3 V with ±10 mV accuracy at 25°C. Over the full operating temperature range (–40°C to +110°C), the threshold drift remains within ±54 mV, ensuring reliable secondary protection across environmental extremes. This specification is confirmed in the Electrical Characteristics table of the official TI datasheet SLUSAJ3K.

How does the BQ294592DRVT interface with the battery cell stack and external FET?

The BQ294592DRVT connects directly to the positive terminals of up to three series-connected Li-ion cells via V1, V2, and V3 pins, with VSS tied to the stack's negative terminal. Its OUT pin drives the gate of an external N-channel MOSFET, pulling high after a 4 s delay when any cell exceeds 4.3 V-enabling the FET to short the fuse to Pack– and blow it using battery or charger current.

Is the thermal pad (PWRPAD) on the BQ294592DRVT optional or mandatory for operation?

The PWRPAD on the BQ294592DRVT is mandatory for proper operation-not optional. It must be electrically and thermally connected to the VSS net on the PCB, as specified in Section 6 and Figure 6-1 of the datasheet. Failure to connect PWRPAD to VSS risks functional failure, thermal instability, and non-compliance with recommended operating conditions.

What are the recommended external components for the BQ294592DRVT's voltage sense inputs?

Texas Instruments specifies RIN = 100–4700 Ω and CIN = 0.1–1 µF per sense input (V1/V2/V3) for noise filtering and stable monitoring. Typical values used in reference designs are 1 kΩ and 0.1 µF. These RC networks must be placed as close as possible to the respective pins to minimize trace loop area and avoid coupling-induced false trips.

Does the BQ294592DRVT support both 2-cell and 3-cell Li-ion configurations?

Yes, the BQ294592DRVT supports both 2-series and 3-series Li-ion battery configurations. In a 2-cell setup, V3 is shorted to V2; in a 3-cell setup, V1, V2, and V3 are each connected to the respective cell positives. The device monitors (V1–VSS), (V2–V1), and (V3–V2) differentially and triggers protection if any differential exceeds 4.3 V.