Texas Instruments BQ296103DSGR

Overview

BQ296103DSGR 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 - used in notebook PC battery protection circuits to trigger fuse-blowing FETs upon cell overvoltage.

For engineers reviewing the BQ296103DSGR datasheet, BQ296103DSGR pinout, BQ296103DSGR application, or BQ296103DSGR equivalent, this page delivers verified technical context, exact pin functions, real-world use cases in medical and UPS backup systems, and validated alternative options with documented functional differences.

Technical Context

The BQ296103DSGR independently monitors each cell voltage (V1–VSS through V4–V3) using precision analog comparators referenced to a factory-trimmed 4.50 V overvoltage threshold. Upon detection of any cell exceeding this level, it initiates a fixed 6.5 s internal delay before asserting the CMOS-active-high OUT signal to drive an external NMOS FET.

Its integrated 3.3 V regulated output (REG) supplies up to 2 mA for always-on circuitry such as RTCs, with self-disable triggered when any cell voltage falls below the factory-set 2.5 V undervoltage threshold after a 6 s delay - ensuring zero parasitic drain during deep discharge.

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 BQ296100DSGR and BQ296107DSGR, the BQ296103DSGR offers the highest OVP threshold (4.50 V) within the BQ2961 family while retaining identical timing, regulation, and package - making it optimal for high-capacity NMC cells operating near upper voltage limits.

Availability

BQ296103DSGR is available at Aetrix Electronics and suitable for notebook PC battery packs, medical portable devices, and UPS battery backup systems requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.

Supply support for BQ296103DSGR 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 and embedded processing technologies, with over 50 years of power management innovation.

The BQ296xxx family was designed specifically for secondary-level overvoltage protection in multi-cell Li-ion battery packs - delivering precision monitoring, regulated auxiliary supply, and robust fault signaling in ultra-small WSON packages.

FAQ

What is the factory-programmed overvoltage threshold for BQ296103DSGR?

The BQ296103DSGR has a factory-programmed overvoltage protection (OVP) threshold of exactly 4.50 V with ±10 mV accuracy at 25°C. This value is laser-trimmed during production and cannot be adjusted externally. The BQ296103DSGR uses this fixed threshold to detect overvoltage conditions on any individual cell in 2–4 series Li-ion battery stacks, initiating a 6.5 s delay before asserting the active-high OUT signal.

Does BQ296103DSGR support 2-cell, 3-cell, and 4-cell battery configurations?

Yes, the BQ296103DSGR supports 2-series, 3-series, and 4-series Li-ion battery configurations via its four independent cell sense inputs (V1–VSS, V2–V1, V3–V2, V4–V3). Unused higher-order sense pins (e.g., V4 in a 2-cell stack) are shorted to the adjacent lower pin per TI's layout guidance. All configurations share the same 4.50 V OVP threshold, 6.5 s delay, and 3.3 V REG output.

What is the function of the REG pin on BQ296103DSGR?

The REG pin on BQ296103DSGR delivers a factory-programmed 3.3 V regulated output capable of supplying up to 2 mA to external circuitry such as real-time clocks or supervisor ICs. It features self-disable functionality: if any monitored cell voltage falls below the factory-set 2.5 V undervoltage threshold for 6 seconds, the REG output shuts off to prevent battery drain. The BQ296103DSGR requires a 0.47 µF ceramic capacitor between REG and VSS for stability.

How does the OUT pin behave during an overvoltage event on BQ296103DSGR?

During an overvoltage event, the BQ296103DSGR asserts its OUT pin as a CMOS active-high signal after a fixed 6.5 s internal delay. The output drives high (up to VDD – 0.3 V at 100 µA sink) to turn on an external NMOS FET, creating a path to ground for the fuse - enabling battery or charger current to blow the fuse and disconnect the pack. The BQ296103DSGR holds OUT high until all cell voltages fall below (4.50 V – 300 mV hysteresis).

What package type and dimensions does BQ296103DSGR use?

The BQ296103DSGR uses an 8-pin WSON package measuring 2.00 mm × 2.00 mm with an exposed thermal pad. This RoHS-compliant, moisture-sensitive level 2a package is optimized for space-constrained battery pack PCBs. Pin 1 is marked by a dot; the exposed pad must be soldered to a VSS copper pour for thermal and electrical performance. The BQ296103DSGR shares this footprint with all BQ2961/BQ2962 variants.