Texas Instruments BQ296229DSGT

Overview

BQ296229DSGT from Texas Instruments is a high-accuracy, low-power overvoltage protector IC for 2–4 series Li-ion battery packs, featuring factory-programmed 4.60 V OVP threshold, 6.5 s fixed delay timer, ±10 mV OVP accuracy, 3.0 V regulated output (2 mA max), and 8-pin WSON (2 mm × 2 mm) package. It monitors each cell independently and drives external FETs to blow fuses during overvoltage faults - used in notebook PC battery protection circuits.

For engineers reviewing the BQ296229DSGT datasheet, BQ296229DSGT pinout, BQ296229DSGT application, or BQ296229DSGT equivalent, this page delivers verified specifications, validated pin functions, confirmed 3.0 V REG output behavior, real-world timing characteristics (6.5 s OVP delay, 6 s UV disable delay), and precise alternative part comparisons for battery pack safety design.

Technical Context

The BQ296229DSGT implements independent per-cell voltage monitoring across up to four series-connected Li-ion cells using precision analog comparators referenced to a factory-trimmed 4.60 V overvoltage threshold. Its internal fixed-delay timer (6.5 s) initiates only upon detection of any cell exceeding VOV, with hysteresis of 250–400 mV to prevent chatter.

It integrates a self-disabling 3.0 V regulated supply delivering up to 2 mA, which remains active only while all cell voltages exceed the factory-set 2.5 V undervoltage threshold (VUVREG); it disables after 6 s if any cell falls below that level. The OUT pin asserts active-high CMOS logic to drive external NMOS FETs for fuse-blowing control.

Key Specifications

Pinout & Package

8-pin WSON package (2.00 mm × 2.00 mm) with exposed thermal pad connected to VSS; RoHS-compliant, moisture-sensitive level 2a.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BQ296229DSGT, BQ296228DSGT offers earlier overvoltage response at 4.55 V, while BQ296231DSGT retains the same 4.60 V threshold but supplies 3.3 V - making both viable alternatives depending on whether OVP timing or regulator voltage alignment drives the selection.

Availability

BQ296229DSGT is available at Aetrix Electronics and suitable for notebook PC battery packs, ultrabook power management systems, and medical portable device backup requiring stable component supply, long-lifecycle support, and guaranteed second-source availability.

Supply support for BQ296229DSGT 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 experience in battery safety ICs.

The BQ296xxx family is designed specifically for second-level hardware overvoltage protection in multi-cell Li-ion battery packs, integrating precision sensing, regulated supply, and fuse-control logic in a single compact IC.

FAQ

What is the exact overvoltage protection threshold and accuracy of the BQ296229DSGT?

The BQ296229DSGT has a factory-programmed overvoltage protection threshold of 4.60 V with ±10 mV accuracy at 25°C and ±54 mV accuracy across –40°C to +110°C. This tight tolerance ensures reliable end-of-charge cutoff without premature triggering in demanding thermal environments. The BQ296229DSGT uses internal trimming to achieve this specification, and hysteresis is fixed at 250–400 mV to prevent oscillation near the trip point.

Does the BQ296229DSGT support 2-cell, 3-cell, and 4-cell Li-ion battery configurations?

Yes, the BQ296229DSGT supports 2-series, 3-series, and 4-series Li-ion battery stacks through its four independent cell-sense inputs (V1–V4). Unused sense pins (e.g., V3 and V4 in a 2S configuration) are shorted to the adjacent lower pin per TI's layout guidance. The BQ296229DSGT automatically adapts monitoring scope based on physical connections - no configuration registers or external programming are required.

What is the function and voltage rating of the REG pin on the BQ296229DSGT?

The REG pin on the BQ296229DSGT delivers a factory-programmed 3.0 V regulated output capable of sourcing up to 2 mA. It powers always-on circuits like RTCs or supervisors and features self-disable: if any monitored cell voltage falls below the 2.5 V undervoltage threshold for 6 seconds, the BQ296229DSGT disables REG to prevent deep discharge. The BQ296229DSGT requires a 0.47 µF ceramic capacitor between REG and VSS for stability.

How does the BQ296229DSGT drive external FETs for fuse blowing?

The BQ296229DSGT drives external NMOS FETs via its active-high CMOS OUT pin, which rises to VDD rail voltage when an overvoltage condition persists for the full 6.5 s delay. This signal turns on the FET gate, connecting the fuse to ground and allowing battery/charger current to blow the fuse. The BQ296229DSGT specifies 4.5 mA source capability on OUT, sufficient to rapidly charge typical FET gate capacitance without external drivers.

Is the BQ296229DSGT pin-compatible with other members of the BQ2962 family?

Yes, all BQ2962 variants including BQ296229DSGT share identical 8-pin WSON (2 mm × 2 mm) packaging and pinout - VDD, VSS, V1–V4, OUT, and REG occupy the same positions across the family. This allows drop-in replacement between BQ2962xx variants when adjusting OVP threshold (e.g., 4.55 V vs. 4.60 V) or REG voltage (3.0 V vs. 3.3 V), provided the application's electrical requirements align with the selected variant's factory settings.