Texas Instruments BQ296103DSGT

Overview

BQ296103DSGT 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, ±10 mV OVP accuracy, active-high OUT signal, and 3.3 V regulated output supply delivering up to 2 mA. It monitors each cell independently and drives external FETs to blow fuses during overvoltage faults in notebook PC battery protection circuits.

For engineers reviewing the BQ296103DSGT datasheet, BQ296103DSGT pinout, BQ296103DSGT application, or BQ296103DSGT equivalent, this page delivers verified technical context, real-world design meaning of key specs, validated pin functions, confirmed alternative options, and supply support details specific to BQ296103DSGT - not generic BQ296xxx family behavior.

Technical Context

The BQ296103DSGT implements independent per-cell voltage monitoring across up to four series-connected Li-ion cells using precision analog comparators referenced to a factory-trimmed 4.50 V OVP threshold with ±10 mV accuracy at 25°C and ≤54 mV drift over –40°C to +110°C. An internal fixed 6.5 s delay timer initiates upon any cell exceeding VOV and triggers the CMOS-active-high OUT pin to drive an external NMOS fuse-control FET.

It integrates a self-disabling 3.3 V regulated output (REG) capable of sourcing 2 mA, which remains enabled unless any monitored cell voltage falls below the factory-set 2.5 V undervoltage threshold for ≥6 s. Input leakage per sense pin is <100 nA, and quiescent current is 4 µA (REG on) or 1.2 µA (REG off), enabling long-term battery pack standby operation.

Key Specifications

Pinout & Package

8-pin WSON package (2.00 mm × 2.00 mm) with exposed thermal pad connected to VSS; optimized for space-constrained battery pack PCB layouts and thermal dissipation into the ground plane.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BQ296103DSGT, BQ296100DSGT offers earlier overvoltage cutoff for safer margin with sensitive cathodes, while BQ296107DSGT raises the undervoltage disable threshold to retain usable capacity longer in aging packs - both share identical pinout, package, and 3.3 V/6.5 s core functionality.

Availability

BQ296103DSGT is available at Aetrix Electronics and suitable for notebook PC battery packs, ultrabook power management systems, and medical portable device battery protection requiring stable component supply, long-term lifecycle assurance, and TI-qualified automotive-grade reliability.

Supply support for BQ296103DSGT 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 ICs, with decades of experience in battery safety and protection solutions.

The BQ296xxx product line is designed specifically for second-level hardware overvoltage protection in multi-cell Li-ion battery packs, integrating precision sensing, regulated auxiliary supply, and fuse-control logic in ultra-small packages.

FAQ

What is the exact overvoltage protection threshold programmed into BQ296103DSGT?

The BQ296103DSGT has a factory-programmed overvoltage protection (OVP) threshold of 4.50 V, with guaranteed accuracy of ±10 mV at 25°C and ≤54 mV total drift across –40°C to +110°C. This value is laser-trimmed during manufacturing and cannot be adjusted externally. The BQ296103DSGT does not support user configuration of the OVP level - it is fixed at 4.50 V, distinguishing it from other variants like BQ296100DSGT (4.35 V) or BQ296106DSGT (4.45 V).

Does BQ296103DSGT support 2-cell, 3-cell, and 4-cell battery configurations?

Yes, BQ296103DSGT supports 2-series, 3-series, and 4-series Li-ion battery configurations. It monitors up to four differential cell voltages via V1–V4 pins: (V1–VSS), (V2–V1), (V3–V2), and (V4–V3). For 2-cell use, V3 and V4 are shorted to V2; for 3-cell, V4 is shorted to V3. All configurations retain full 4.50 V OVP accuracy and 6.5 s delay functionality. The BQ296103DSGT datasheet confirms compatibility across all three topologies without derating.

What is the function and voltage rating of the REG pin on BQ296103DSGT?

The REG pin on BQ296103DSGT delivers a factory-programmed 3.3 V regulated output capable of sourcing up to 2 mA. It powers external always-on circuitry such as RTCs or supervisor ICs. Output accuracy is ±30 mV at 500 µA load and ±100 mV from 0–2 mA. The BQ296103DSGT automatically disables REG if any monitored cell voltage falls below 2.5 V for ≥6 s, preventing deep discharge. External 0.47 µF ceramic capacitor to VSS is mandatory for stability.

How does the OUT pin behave during an overvoltage event on BQ296103DSGT?

During an overvoltage event, the OUT pin on BQ296103DSGT transitions from low to CMOS active-high after a fixed 6.5 s delay. It sources up to 4.5 mA (typical) to drive the gate of an external NMOS FET, creating a low-impedance path from fuse to ground. This allows battery or charger current to blow the fuse and disconnect the pack. The BQ296103DSGT holds OUT high until all cell voltages fall below (4.50 V – 300 mV hysteresis), then returns to low-impedance inactive state.

Is BQ296103DSGT pin-compatible with other BQ2961xx variants?

Yes, all BQ2961xx variants including BQ296103DSGT use identical 8-pin WSON (2 mm × 2 mm) packaging and fully compatible pinout: VDD, VSS, V1–V4, OUT, and REG occupy the same physical locations. No PCB layout changes are required when substituting between BQ296100DSGT, BQ296103DSGT, BQ296106DSGT, or BQ296107DSGT - only the factory-programmed OVP and UV thresholds differ. This enables single-design flexibility across multiple protection profiles.