Texas Instruments BQ296112DSGR

Overview

BQ296112DSGR 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, 3-second fixed delay timer, ±10 mV OVP accuracy, active-high fault output (OUT), and 3.3 V regulated supply (REG) delivering up to 2 mA. It serves as second-level protection in notebook PC battery management systems.

For engineers reviewing the BQ296112DSGR datasheet, BQ296112DSGR pinout, BQ296112DSGR application, or BQ296112DSGR equivalent, this page delivers verified technical context, real-world implementation constraints, confirmed pin functions, and validated alternative options for battery pack safety design.

Technical Context

The BQ296112DSGR independently monitors each cell voltage (V1–VSS through V4–V3) against a factory-trimmed 4.50 V overvoltage threshold with 300 mV hysteresis and ±10 mV accuracy at 25°C. Upon detection, it initiates a precise 3.0 s (±0.6 s) internal delay before asserting the CMOS-active-high OUT signal to trigger external FET-based fuse blow circuitry.

Its integrated 3.3 V REG output delivers up to 2 mA with ±30 mV load regulation (0–2 mA), self-disables when any cell falls below 2.5 V (VUVREG), and draws only 4 µA quiescent current with REG enabled or 1.2 µA with REG disabled - enabling always-on RTC support without excessive battery drain.

Key Specifications

Pinout & Package

8-pin WSON package (2.00 mm × 2.00 mm) with exposed thermal pad connected to VSS. Pin 1 is top-left corner (marking dot adjacent), pin numbering follows standard counter-clockwise sequence.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BQ296112DSGR, BQ296114DSGR extends fault confirmation time for improved noise immunity, while BQ296212DSGR improves REG output precision at the cost of slightly higher production test complexity - both retain identical pinout, package, and functional interface.

Availability

BQ296112DSGR is available at Aetrix Electronics and suitable for notebook PC battery packs, ultrabook protection modules, and medical portable device designs requiring stable component supply, long-lifecycle support, and guaranteed traceable sourcing.

Supply support for BQ296112DSGR 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 overvoltage protection and regulated auxiliary supply in multi-cell Li-ion battery packs - targeting high-reliability portable and industrial energy storage systems.

FAQ

What is the exact overvoltage threshold and delay time configured in BQ296112DSGR?

The BQ296112DSGR has a factory-programmed overvoltage threshold of 4.50 V with ±10 mV accuracy at 25°C and a fixed 3.0-second delay timer (±0.6 s) before the OUT pin asserts high. These values are laser-trimmed during manufacturing and cannot be modified in the field. The BQ296112DSGR datasheet specifies these parameters in Table 4-1 and Section 6.5.

Does BQ296112DSGR support 2-cell, 3-cell, and 4-cell battery configurations?

Yes, BQ296112DSGR supports 2-, 3-, and 4-series Li-ion configurations via its four independent cell sense inputs (V1–VSS, V2–V1, V3–V2, 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 OVP monitoring and 3.3 V REG functionality. This flexibility is documented in Section 7.4.1 and Figure 8-2.

How does the regulated output (REG) of BQ296112DSGR behave during battery discharge?

The BQ296112DSGR REG pin delivers 3.3 V (±30 mV) 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 2.55 V (2.5 V + 50 mV hysteresis). This prevents deep discharge and protects downstream RTC circuits - detailed in Section 7.3.3 and Figure 7-2.

What is the recommended layout practice for the VSS connection in BQ296112DSGR?

Texas Instruments mandates connecting VSS before any other pin during assembly or testing to prevent REG pin damage. If VSS cannot be connected first, a 5 Ω resistor must be placed in series with the REG capacitor (Figure 8-2) to limit inrush current. This requirement is explicitly stated in Section 8.2.2 and reinforced in the "CAUTION" box of Section 7.4.4.

Can BQ296112DSGR be used without external RC filters on the Vx pins?

No - external RC filters (1 kΩ + 0.1 µF per cell input) are mandatory for stable operation. The BQ296112DSGR's internal comparators rely on these filters to reject high-frequency noise and ensure accurate OVP detection. Deviating from the 1 kΩ value alters the effective OVP threshold and invalidates the ±10 mV accuracy specification, as noted in Table 8-1 and Section 8.2.1.