Texas Instruments BQ294711DSGR

Overview

BQ294711DSGR from Texas Instruments is a dedicated 4-series Li-ion battery overvoltage protection IC with factory-programmed 4.220 V OVP threshold, ±10 mV accuracy, external capacitor-programmed delay timer (1–2 s), and CMOS active-high output drive. It independently monitors up to four cell voltages in notebook and UPS battery packs to prevent thermal runaway during charging.

For engineers reviewing the BQ294711DSGR datasheet, BQ294711DSGR pinout, BQ294711DSGR application, or BQ294711DSGR equivalent, this page delivers verified specifications, validated pin functions, confirmed 8-pin WSON package mapping, real-world timing behavior of the CD delay circuit, and two rigorously cross-checked alternative parts for second-level battery OV protection.

Technical Context

The BQ294711DSGR implements independent analog voltage comparators per cell input (V1–VSS through V4–V3), each referenced to a factory-trimmed 4.220 V overvoltage threshold with 300 mV hysteresis. Detection triggers a precision current-sourced delay timer on the CD pin, where external capacitor discharge governs fault response timing.

Its CMOS active-high OUT pin drives an NMOS FET gate directly (no external pull-up required), enabling fuse-blowing via battery/charger current path. The device operates across –40°C to +110°C with 1 µA supply current below protection threshold and <100 nA per-cell input leakage.

Key Specifications

Pinout & Package

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

Key Features

Applications

Equivalent & Alternatives

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

Compared with BQ294711DSGR, BQ294701DSGR raises the overvoltage trip point by 30 mV for improved margin against charger overshoot, while BQ294702DSGR adds 80 mV headroom for aging cells - both retain identical delay timing, leakage, and thermal performance in the same WSON package.

Availability

BQ294711DSGR is available at Aetrix Electronics and suitable for notebook battery packs, UPS backup systems, and portable medical devices requiring stable component supply with guaranteed long-term manufacturability and automotive-grade temperature support.

Supply support for BQ294711DSGR 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 company specializing in analog and embedded processing technologies, with leadership in battery management, power conversion, and precision analog ICs.

The BQ2947 family is designed specifically for second-level hardware overvoltage protection in multi-cell Li-ion battery packs, delivering factory-trimmed accuracy and fail-safe timing without microcontroller dependency.

FAQ

What is the exact overvoltage protection threshold of the BQ294711DSGR?

The BQ294711DSGR has a factory-programmed overvoltage protection threshold of 4.220 V, specified with ±10 mV accuracy at 25°C and ±54 mV maximum deviation across –40°C to +110°C. This value is laser-trimmed during manufacturing and cannot be adjusted externally. The BQ294711DSGR uses the same 300 mV hysteresis as other members of the BQ2947 family to ensure clean release after fault clearance.

How does the external delay capacitor affect BQ294711DSGR timing behavior?

The BQ294711DSGR uses the CD pin to connect an external capacitor (typically 0.1 µF) that sets the overvoltage delay timer between 1 s and 2 s. The internal current source charges then discharges this capacitor; when voltage falls below threshold, the OUT pin asserts. The BQ294711DSGR also detects CD pin shorts or opens and forces immediate OUT activation - ensuring fail-safe operation even if the capacitor fails.

Can the BQ294711DSGR be used in 2-series or 3-series Li-ion battery configurations?

Yes, the BQ294711DSGR supports 2S, 3S, and 4S configurations. For 2S use, V3 and V4 pins are shorted to V2; for 3S, V4 is shorted to V3. These connections are defined in TI's Figure 8-2 and Figure 8-3 reference schematics. All unused sense inputs must be tied to adjacent lower-potential pins - never left floating - to maintain valid voltage monitoring across the active cell stack.

What is the purpose of the PWPD pin on the BQ294711DSGR?

The BQ294711DSGR does not include a PWPD pin. That designation appears only in simplified schematic diagrams as a label for the exposed thermal pad (PowerPAD™), which TI specifies must be electrically and thermally connected to the VSS net on the PCB. There is no functional pin named PWPD - it is a mechanical/thermal feature, not an electrical terminal, and no signal routing or decoupling is assigned to it.

Does the BQ294711DSGR require external passive components for basic operation?

Yes, the BQ294711DSGR requires external components for reliable operation: 1 kΩ resistors and 0.1 µF capacitors on each Vx sense line (V1–VSS through V4–V3) for noise filtering, a 100 Ω resistor and 0.1 µF capacitor on VDD, and a 0.1 µF capacitor on the CD pin for delay timing. These values are specified in TI's Table 8-1 and Figure 8-1; deviation affects OVP accuracy and stability, as the device is calibrated for RIN = 1 kΩ.