Texas Instruments BQ294706DSGT

Overview

BQ294706DSGT from Texas Instruments is a factory-programmed, 4-series Li-ion battery overvoltage protection IC with ±10 mV accuracy, 4.55 V OVP threshold, and external capacitor-programmed delay timer. It monitors each cell independently, delivers active-high CMOS output, and operates across –40°C to +85°C for notebook and UPS battery pack safety systems.

For engineers reviewing the BQ294706DSGT datasheet, BQ294706DSGT pinout, BQ294706DSGT application, or BQ294706DSGT equivalent, key selection factors include its 4.55 V fixed overvoltage threshold, 1 µA quiescent current, 8-pin WSON (2 mm × 2 mm) package, CD pin-based fault delay timing, and independent per-cell voltage sensing architecture.

Technical Context

The BQ294706DSGT implements second-level overvoltage protection by continuously comparing each cell's differential voltage (V1–VSS, V2–V1, V3–V2, V4–V3) against its factory-trimmed 4.55 V threshold. Upon detection, it initiates a CD pin-based RC delay timer with 1–2 s nominal range using a 0.1 µF capacitor.

It features built-in timeout detection on the CD pin to force OUT activation if the capacitor is open or shorted, and supports customer test mode with ≤170 ms reduced delay when CD is grounded. The device draws only 1 µA in normal operation and maintains <100 nA per-cell input leakage.

Key Specifications

Pinout & Package

8-pin WSON (DSG) package with exposed thermal pad (PowerPAD™), dimensions 2.00 mm × 2.00 mm, recommended PCB connection of thermal pad to VSS.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BQ294706DSGT, BQ294708DSGT offers a slightly lower trip point for enhanced margin against voltage overshoot, while BQ294704DSGT provides earlier intervention for aging cells - both retain identical timing, leakage, and layout compatibility, enabling drop-in replacement with only threshold validation required.

Availability

BQ294706DSGT is available at Aetrix Electronics and suitable for notebook battery management, UPS backup systems, and industrial portable equipment requiring stable component supply and guaranteed long-term manufacturability.

Supply support for BQ294706DSGT 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 BQ2947 family was designed specifically for second-level hardware overvoltage protection in multi-cell Li-ion battery packs, emphasizing precision, fault tolerance, and minimal power overhead in safety-critical applications.

FAQ

What is the exact overvoltage protection threshold of the BQ294706DSGT?

The BQ294706DSGT has a factory-programmed overvoltage protection threshold of 4.55 V with ±10 mV accuracy at 25°C. This value is trimmed during manufacturing and remains stable across temperature, with drift bounded to ±54 mV at 110°C. The BQ294706DSGT does not support user adjustment - its fixed threshold ensures consistent, repeatable protection behavior in 4S Li-ion applications.

Does the BQ294706DSGT support 2-cell or 3-cell battery configurations?

Yes, the BQ294706DSGT supports 2S and 3S configurations. For 2S use, V3 and V4 pins are shorted to V2; for 3S, V4 is shorted to V3. The device monitors only the connected differential pairs (e.g., V1–VSS, V2–V1, V3–V2), ignoring unused upper sense inputs. All electrical specifications - including leakage, current, and timing - remain valid in these reduced configurations.

How does the CD pin fault detection work on the BQ294706DSGT?

The BQ294706DSGT continuously monitors the CD pin for proper capacitor charging/discharging behavior. If the external capacitor is open-circuited (no voltage rise) or shorted to VSS (no discharge phase), the internal timeout circuit detects the anomaly and forces the OUT pin active within milliseconds - ensuring fail-safe response even when the timing component fails. This behavior is documented in Section 7.3.1.4 of the BQ294706DSGT datasheet.

What is the maximum recommended supply voltage for the BQ294706DSGT?

The BQ294706DSGT supports a VDD supply range of 3 V to 20 V, with absolute maximum rating of 30 V. For reliable operation in Li-ion battery packs, VDD is typically derived from the full-stack voltage (e.g., ~16.8 V for 4S), and must be filtered with a 100 Ω resistor and 0.1 µF capacitor as specified in the BQ294706DSGT reference design. Exceeding 20 V risks exceeding recommended operating conditions.

Can the BQ294706DSGT be used with an open-drain output configuration?

No - the BQ294706DSGT is exclusively configured for CMOS active-high output. Open-drain active-low variants exist in the BQ2947 family (e.g., BQ294707), but the "06" suffix denotes the 4.55 V / active-high version. Attempting to use external pull-down or reconfigure OUT as open-drain violates the BQ294706DSGT's specified drive capability and may cause unreliable fault signaling.