Texas Instruments BQ294700DSGT

Overview

BQ294700DSGT from Texas Instruments is a dedicated 4-series Li-ion battery overvoltage protection IC with factory-programmed 4.350 V threshold, ±10 mV accuracy, and external capacitor–programmed delay timer (1–2 s with 0.1 µF). It monitors each cell independently, drives an active-high CMOS output, and operates across –40°C to +85°C in notebook and UPS battery backup systems.

For engineers reviewing the BQ294700DSGT datasheet, BQ294700DSGT pinout, BQ294700DSGT application, or BQ294700DSGT equivalent, this page delivers verified specifications, validated pin functions, confirmed 2S–4S cell support, real-world timing behavior of the CD delay circuit, and precise OVP hysteresis (300 mV) for reliable fault response in high-reliability battery packs.

Technical Context

The BQ294700DSGT implements independent per-cell voltage sensing using analog input terminals (V1–V4), compares each against a fixed 4.350 V OVP threshold with ±10 mV accuracy at 25°C and ±54 mV drift up to 110°C, and triggers a CMOS active-high output after a user-settable delay governed by external capacitor discharge on the CD pin.

Its functional architecture includes built-in timeout detection for CD pin open/short faults, customer test mode enabling sub-170 ms OV verification, and ultra-low quiescent current (1–2 µA) during normal operation with <100 nA per-cell input leakage - all within an 8-pin WSON (2.0 mm × 2.0 mm) package with exposed thermal pad tied to VSS.

Key Specifications

Pinout & Package

Package: 8-pin WSON (DSG), 2.00 mm × 2.00 mm, exposed thermal pad (PowerPAD™) requiring PCB connection to VSS.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BQ294700DSGT, BQ294701DSGT offers a 100 mV lower OVP threshold for enhanced longevity in sensitive chemistries, while BQ294704DSGT raises the threshold by 50 mV to maximize energy extraction from advanced cells - both retain identical timing, leakage, and thermal performance.

Availability

BQ294700DSGT is available at Aetrix Electronics and suitable for notebook battery packs, UPS backup systems, and medical portable devices requiring stable component supply with guaranteed long-term manufacturability and RoHS-compliant WSON packaging.

Supply support for BQ294700DSGT 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 decades of expertise in battery management and precision analog IC design.

The BQ2947 family was developed specifically for second-level hardware overvoltage protection in multi-cell Li-ion battery packs, targeting applications demanding autonomous, accurate, and fail-safe cell supervision independent of system firmware.

FAQ

What is the exact overvoltage protection threshold of the BQ294700DSGT?

The BQ294700DSGT has a factory-programmed overvoltage protection threshold of 4.350 V with ±10 mV accuracy at 25°C. This value is fixed and cannot be adjusted externally. The BQ294700DSGT datasheet specifies no tolerance range - it is trimmed to nominal 4.350 V during manufacturing, making it suitable for designs requiring strict adherence to this cutoff voltage in 4S Li-ion configurations.

Does the BQ294700DSGT support 2-cell or 3-cell battery configurations?

Yes, the BQ294700DSGT supports 2S and 3S Li-ion configurations. For 2S operation, V3 and V4 pins must be shorted to V2; for 3S, V4 is shorted to V3. The device monitors only the connected differential pairs (e.g., V1–VSS, V2–V1, etc.) and ignores unconnected upper sense inputs - all while retaining its 4.350 V OVP threshold and 300 mV hysteresis per monitored cell.

How does the CD pin function in the BQ294700DSGT, and what capacitor value is recommended?

The CD pin on the BQ294700DSGT connects to an external capacitor that sets the overvoltage delay timer. With a 0.1 µF capacitor, the delay is 1–2 seconds. The BQ294700DSGT includes fault detection: if the CD capacitor is open or shorted, the OUT pin activates immediately. TI recommends 0.1 µF ±10% X7R ceramic for optimal stability and timing predictability across temperature.

What is the output drive capability of the BQ294700DSGT's OUT pin?

The BQ294700DSGT's OUT pin is CMOS active-high with a minimum sink current of 4.5 mA when asserted, capable of directly driving the gate of a standard NMOS fuse-control FET. In inactive state, it pulls to ground (≤400 mV at 100 µA load). No external pull-up is required - unlike open-drain variants - simplifying layout and reducing component count in the BQ294700DSGT implementation.

Is the BQ294700DSGT compatible with high-temperature environments such as industrial UPS systems?

Yes, the BQ294700DSGT is rated for operation from –40°C to +85°C and features guaranteed performance across this range, including OVP accuracy drift of ±54 mV maximum at +110°C (derated condition). Its WSON package includes a thermal pad connected to VSS, enabling effective heat dissipation in enclosed UPS battery compartments where ambient temperatures may exceed 70°C during extended operation.