Texas Instruments BQ294701DSGR

Overview

BQ294701DSGR from Texas Instruments is a precision overvoltage protection IC for 2- to 4-series Li-ion battery packs, featuring factory-programmed 4.250 V OVP threshold, ±10 mV accuracy at 25°C, external capacitor-programmed delay timer (1–2 s with 0.1 µF), and CMOS active-high output drive. It operates across –40°C to +85°C and supports notebook and UPS battery backup systems.

For engineers reviewing the BQ294701DSGR datasheet, BQ294701DSGR pinout, BQ294701DSGR application, or BQ294701DSGR equivalent, key selection criteria include cell count support (2S–4S), OVP threshold tolerance (±10 mV), ultra-low quiescent current (≈1 µA), CD pin fault detection capability, and WSON-8 package compatibility with high-density PCB layouts.

Technical Context

The BQ294701DSGR implements independent per-cell voltage monitoring using analog sense inputs (V1–V4) referenced to VSS, with internal comparators comparing each differential cell voltage against its preprogrammed 4.250 V overvoltage threshold. Hysteresis is fixed at 300 mV to prevent chatter during recovery.

Upon detection of any cell exceeding 4.250 V, the device initiates an external RC-based delay timer via the CD pin; the OUT pin transitions high after the delay expires unless the CD capacitor is open or shorted - in which case fault detection triggers immediate activation. The IC draws only ≈1 µA supply current when all cells remain below threshold.

Key Specifications

Pinout & Package

Package: 8-pin WSON (DSG), 2.00 mm × 2.00 mm, exposed thermal pad (PowerPAD™) recommended to be connected to VSS on PCB.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BQ294700DSGR and BQ294702DSGR, the BQ294701DSGR offers the most widely adopted 4.250 V threshold for standard cobalt-based Li-ion cells, delivering optimal trade-off between energy density and long-term stability without altering delay timing or power consumption.

Availability

BQ294701DSGR is available at Aetrix Electronics and suitable for notebook battery packs, UPS backup systems, and medical portable equipment requiring stable component supply, long-lifecycle support, and guaranteed traceability.

Supply support for BQ294701DSGR 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 was designed specifically for second-level overvoltage protection in multi-cell Li-ion battery packs, targeting high-accuracy, low-power, and fail-safe fault response in consumer, industrial, and medical applications.

FAQ

What is the exact overvoltage protection threshold of the BQ294701DSGR?

The BQ294701DSGR has a factory-programmed overvoltage protection threshold of 4.250 V, with a tolerance of ±10 mV at 25°C and ±54 mV across the full –40°C to +110°C operating range. This value is laser-trimmed during manufacturing and cannot be adjusted externally. The BQ294701DSGR maintains this specification without requiring calibration or external components, ensuring consistent cell-level protection in multi-series Li-ion battery packs.

How does the BQ294701DSGR handle faulty external delay capacitors?

The BQ294701DSGR includes built-in CD pin timeout detection that actively monitors the external delay capacitor connected to the CD pin. If the capacitor is open-circuited or shorted to ground, the BQ294701DSGR triggers the OUT pin immediately - bypassing the normal 1–2 s delay - to ensure fail-safe overvoltage response. This feature is documented in Section 7.3.1.4 of the BQ294701DSGR datasheet and applies regardless of cell count configuration.

Can the BQ294701DSGR be used in 2-cell or 3-cell battery configurations?

Yes, the BQ294701DSGR supports 2-series (2S), 3-series (3S), and 4-series (4S) Li-ion battery configurations. For 2S use, V3 and V4 pins must be shorted to V2; for 3S use, V4 must be shorted to V3. All unused sense inputs retain full functionality and require the same RC filtering (1 kΩ/0.1 µF) as active inputs. The BQ294701DSGR's internal architecture automatically adapts to the number of connected cells without configuration changes.

What is the purpose of the Customer Test Mode in the BQ294701DSGR?

The Customer Test Mode in the BQ294701DSGR reduces the overvoltage delay time to ≤170 ms by grounding the CD pin, enabling rapid functional verification during production testing. This mode retains full overvoltage detection accuracy and fault response behavior while accelerating test throughput. The BQ294701DSGR enters this mode automatically when CD is pulled to VSS, and no additional control signals or firmware are required to activate it.

Does the BQ294701DSGR require external passive components for basic operation?

Yes, the BQ294701DSGR requires external RC filters on all Vx sense inputs (V1–V4) and VDD: 1 kΩ resistor and 0.1 µF capacitor per input, as specified in Table 8-1 of the datasheet. A 0.1 µF capacitor is also mandatory on the CD pin for delay timing. These components are essential for noise immunity, accurate voltage measurement, and proper timer function - omitting them compromises BQ294701DSGR performance and reliability.