Texas Instruments BQ294532DRVR

Overview

BQ294532DRVR from Texas Instruments is a secondary overvoltage protection IC for 2- or 3-series Li-ion battery packs, featuring fixed 4.5 V OVP threshold, 4 s fault detection delay, ±10 mV accuracy, 1 µA supply current (VCELL < VPROTECT), and 6-pin SON package. It drives an external N-channel FET to blow a fuse during overvoltage events in portable power tools and tablets.

For engineers reviewing the BQ294532DRVR datasheet, BQ294532DRVR pinout, BQ294532DRVR application, or BQ294532DRVR 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 connection requirement, and compatibility with 2-/3-cell stack topologies.

Technical Context

The BQ294532DRVR implements independent analog voltage monitoring of three cell inputs (V1, V2, V3) using a multiplexer-based sensing architecture. Overvoltage detection compares each differential cell voltage (V1–VSS, V2–V1, V3–V2) against a factory-programmed 4.5 V threshold with 300 mV typical hysteresis.

Upon detection, a fixed 4 s delay timer activates before asserting the open-drain OUT pin high to drive an external NMOS gate. The device operates from 3 V to 25 V supply (VDD), supports customer test mode (CTM) for accelerated delay verification, and requires PWRPAD soldered to VSS on PCB for thermal and functional integrity.

Key Specifications

Pinout & Package

Package: 6-pin WSON (DRV), 2.00 mm × 2.00 mm body size, 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 BQ294532DRVR, BQ294533DRVR offers longer fault confirmation time at identical voltage threshold, while BQ294522DRVR provides lower 4.45 V trip point for enhanced cell longevity-both share pinout and thermal design, enabling layout reuse with only parameter revalidation.

Availability

BQ294532DRVR is available at Aetrix Electronics and suitable for power tools, tablets, and notebook computers requiring stable component supply, long-lifecycle support, and automotive-grade temperature resilience.

Supply support for BQ294532DRVR 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 and precision analog ICs.

The BQ2945xy product line delivers secondary overvoltage protection for multi-cell Li-ion battery packs, designed specifically for safety-critical portable and power-tool applications where reliability and parametric consistency are mandatory.

FAQ

What is the exact overvoltage protection threshold and accuracy of the BQ294532DRVR?

The BQ294532DRVR has a factory-programmed overvoltage protection threshold of 4.5 V with ±10 mV accuracy at 25°C. Over the full operating temperature range (–40°C to +110°C), the threshold drift is bounded at ±54 mV, and hysteresis is specified between 250 mV and 400 mV. These values are measured under standard test conditions per the official TI datasheet SLUSAJ3K.

Does the BQ294532DRVR support both 2-cell and 3-cell Li-ion battery configurations?

Yes, the BQ294532DRVR supports both 2-series and 3-series Li-ion battery configurations. In a 2-cell setup, the V3 pin is shorted to V2; in a 3-cell configuration, V1, V2, and V3 independently monitor each cell's voltage relative to its adjacent node. All configurations use the same BQ294532DRVR device without modification.

What is the role of the PWRPAD thermal pad on the BQ294532DRVR package?

On the BQ294532DRVR, the PWRPAD thermal pad must be electrically and thermally connected to the VSS net on the PCB. This connection is mandatory for proper internal biasing, thermal dissipation, and functional reliability. Failure to solder PWRPAD to VSS may result in incorrect OVP detection or device malfunction.

How does the BQ294532DRVR handle overvoltage events and reset conditions?

The BQ294532DRVR asserts its OUT pin high after detecting any cell voltage exceeding 4.5 V for a continuous 4 s period. The output resets low only when all monitored cell voltages fall below (4.5 V – VHYS), where VHYS is 250–400 mV. This hysteresis prevents oscillation during marginal recovery and ensures clean latch-and-release behavior.

Can the BQ294532DRVR be used without external RC filtering components?

No, the BQ294532DRVR requires external RC filters on each cell input (V1, V2, V3) and on VDD. Recommended RIN is 100–4700 Ω and CIN is 0.1–1 µF per input. Omitting these filters compromises noise immunity and may cause false triggering or measurement inaccuracy, as explicitly stated in Section 9.2.1 of the datasheet.