Texas Instruments BQ296224DSGT

Overview

BQ296224DSGT from Texas Instruments is a high-accuracy, low-power overvoltage protector IC for 2–4 series Li-ion battery packs, featuring factory-programmed 4.50 V OVP threshold, 6.5 s fixed delay timer, active-high OUT signal, ±10 mV OVP accuracy, and 3.0 V regulated output supply delivering up to 2 mA. It is used in notebook PC battery protection circuits to trigger fuse-blowing FETs upon cell overvoltage.

For engineers reviewing the BQ296224DSGT datasheet, BQ296224DSGT pinout, BQ296224DSGT application, or BQ296224DSGT equivalent, this page delivers verified technical context, real-world timing behavior, regulator self-disable logic, leakage current specs (<100 nA/cell), and precise package mapping for WSON-8 (2 mm × 2 mm) - all critical for battery pack safety design and BOM validation.

Technical Context

The BQ296224DSGT independently monitors each cell voltage (V1–VSS through V4–V3) against its factory-set 4.50 V overvoltage threshold with ±10 mV accuracy at 25°C and 300–400 mV hysteresis. Upon detection, it initiates a fixed 6.5 s internal delay before asserting the CMOS active-high OUT signal to drive an external NMOS FET for fuse activation.

Its 3.0 V regulated output (REG) delivers up to 2 mA and self-disables when any cell voltage falls below the factory-configured 2.5 V undervoltage threshold for ≥6 s; re-enables only after all cells exceed 2.5 V + 300 mV hysteresis. Supply current is 4 µA (REG on) or 1.2 µA (REG off) under normal operation.

Key Specifications

Pinout & Package

Package: 8-pin WSON (2.00 mm × 2.00 mm), exposed thermal pad (PWPD) recommended to be connected to VSS.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BQ296224DSGT, BQ296223DSGT offers identical timing and accuracy but supplies 3.3 V instead of 3.0 V - requiring voltage rail compatibility checks - while BQ296231DSGT raises the OVP threshold to 4.60 V, trading tighter cell safety margin for extended charging headroom in specific chemistries.

Availability

BQ296224DSGT is available at Aetrix Electronics and suitable for notebook PC battery packs, ultrabook power management, and medical portable devices requiring stable component supply, long-lifecycle support, and TI-qualified automotive-grade reliability.

Supply support for BQ296224DSGT 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 leader specializing in analog, embedded processing, and power management technologies, with decades of expertise in battery safety ICs and high-reliability industrial components.

The BQ296xxx product line is designed specifically for second-level overvoltage protection in multi-cell Li-ion battery packs, integrating precision voltage monitoring, programmable delay timers, and regulated auxiliary supplies to replace discrete protection schemes.

FAQ

What is the exact overvoltage protection threshold and accuracy of the BQ296224DSGT?

The BQ296224DSGT has a factory-programmed overvoltage protection threshold of 4.50 V with ±10 mV accuracy at 25°C, and ±54 mV accuracy across the full –40°C to +110°C operating range. This specification is measured under defined test conditions (VDD = 3–15 V, TA = –40°C to +110°C) and ensures tight per-cell voltage control in 2–4 series Li-ion battery packs. The BQ296224DSGT's accuracy eliminates need for external calibration.

How does the regulated output (REG) of the BQ296224DSGT behave during battery discharge?

The BQ296224DSGT's REG pin delivers a stable 3.0 V output up to 2 mA, but self-disables when any monitored cell voltage falls below the factory-set 2.5 V undervoltage threshold for ≥6 seconds. It re-enables only after all cells exceed 2.5 V + 300 mV hysteresis. This behavior prevents excessive discharge and protects downstream circuits like RTCs from brownout - a core safety feature of the BQ296224DSGT.

What is the purpose and timing of the 6.5-second delay in the BQ296224DSGT?

The 6.5-second delay in the BQ296224DSGT is a fixed, factory-programmed timer that begins counting only after an overvoltage condition (≥4.50 V) is detected on any cell. It prevents false triggering from transient spikes and ensures the fault is sustained before asserting the active-high OUT signal. This deterministic delay allows coordinated fuse blowing using external NMOS FETs - a key timing behavior of the BQ296224DSGT in safety-critical battery systems.

Can the BQ296224DSGT be used in 2-series and 3-series battery configurations?

Yes, the BQ296224DSGT supports 2-, 3-, and 4-series Li-ion configurations. For 2-series use, V3 and V4 pins are shorted to V2; for 3-series, V4 is shorted to V3. All unused Vx pins must be tied to the adjacent lower-sense node - not left floating - to maintain accurate differential measurement and avoid false undervoltage detection. This flexibility is built into the BQ296224DSGT's pin architecture.

What package type and thermal characteristics does the BQ296224DSGT have?

The BQ296224DSGT uses an 8-pin WSON package (2.00 mm × 2.00 mm) with an exposed thermal pad (PWPD) that TI recommends connecting to VSS for optimal thermal performance. Its junction-to-board thermal resistance (RθJB) is 32.5°C/W, and maximum operating ambient temperature is +110°C - enabling reliable operation in compact, high-density battery PCB layouts where the BQ296224DSGT is often placed near cell terminals.