Texas Instruments BQ294706DSGR

Overview

BQ294706DSGR from Texas Instruments is a dedicated 4-series Li-ion battery overvoltage protection IC with factory-programmed 4.55 V OVP threshold, ±10 mV accuracy, external capacitor-programmed delay timer (1–2 s), and CMOS active-high output drive. It monitors each cell independently and triggers fault response upon any cell exceeding threshold-used in notebook battery packs and UPS backup systems.

For engineers reviewing the BQ294706DSGR datasheet, BQ294706DSGR pinout, BQ294706DSGR application, or BQ294706DSGR equivalent, this page delivers verified technical context, real-world timing behavior, validated package mapping, confirmed leakage and supply current specs, and two rigorously cross-checked alternative parts for second-level battery pack protection design.

Technical Context

The BQ294706DSGR implements independent per-cell voltage sensing across four series-connected Li-ion cells using analog input terminals (V1–V4, VSS), comparing each against a fixed 4.55 V factory-trimmed overvoltage threshold with 300 mV hysteresis. Its delay timer is fully external-controlled by capacitor value on CD pin-and includes open/short fault detection for that capacitor.

In overvoltage mode, the device drives OUT high after the programmed delay; in normal operation, OUT remains low with <1 µA supply current and <100 nA per-cell input leakage. It operates from 3 V to 20 V supply and supports –40°C to +110°C ambient, with thermal resistance RθJA = 62°C/W in its WSON-8 package.

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 BQ294706DSGR, BQ294708DSGR offers a slightly lower OVP threshold for tighter voltage control, while BQ294704DSGR provides a more conservative 4.40 V setting-both retain identical delay behavior, package, and interface, enabling direct substitution only when threshold alignment is verified per cell chemistry and system safety analysis.

Availability

BQ294706DSGR is available at Aetrix Electronics and suitable for notebook battery packs, UPS backup systems, and industrial portable test equipment requiring stable component supply, long-lifecycle support, and guaranteed RoHS-compliant sourcing.

Supply support for BQ294706DSGR 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 delivering analog, embedded processing, and power management solutions with deep expertise in battery safety ICs and precision analog design.

The BQ2947 family is part of TI's battery monitor and protector portfolio, engineered specifically for second-level hardware-based overvoltage protection in multi-cell Li-ion packs-prioritizing accuracy, fault resilience, and minimal quiescent power.

FAQ

What is the exact overvoltage protection threshold of the BQ294706DSGR?

The BQ294706DSGR has a factory-programmed overvoltage protection threshold of 4.55 V, with ±10 mV accuracy at 25°C and drift up to ±54 mV across –40°C to +110°C. This value is laser-trimmed during manufacturing and cannot be adjusted externally-ensuring consistent performance without calibration overhead in BQ294706DSGR-based designs.

How does the external delay capacitor affect BQ294706DSGR timing behavior?

The BQ294706DSGR uses an external capacitor on the CD pin to set overvoltage delay: t_CD = K × C_CD, where K ranges from 10 to 20. With a typical 0.1 µF capacitor, delay is 1–2 seconds. The BQ294706DSGR also detects CD pin faults-if the capacitor is open or shorted, it triggers OUT immediately, ensuring fail-safe response regardless of external component integrity.

Can BQ294706DSGR be used in 2-series or 3-series Li-ion configurations?

Yes, the BQ294706DSGR supports 2S and 3S configurations. For 2S, pins V3 and V4 must be shorted to V2; for 3S, V4 is shorted to V3. The device automatically adapts sensing-only V1–VSS, V2–V1, and V3–V2 (or V2–V1 for 2S) are evaluated. All electrical specs-including 4.55 V threshold and 1 µA supply current-remain valid in these reduced-cell modes.

What is the purpose of the Customer Test Mode in BQ294706DSGR?

The Customer Test Mode in BQ294706DSGR reduces overvoltage verification time to ≤170 ms by grounding the CD pin, bypassing the full 1–2 s delay. This enables rapid functional testing during PCB assembly without modifying firmware or waiting for extended timeouts-while preserving full production-mode timing behavior when CD is connected to the timing capacitor.

Does BQ294706DSGR require external components for basic operation?

Yes, BQ294706DSGR requires external components: a 0.1 µF capacitor on CD for delay timing, 1 kΩ resistors and 0.1 µF capacitors on each Vx pin for noise filtering, and a 100 Ω resistor plus 0.1 µF capacitor on VDD. These are mandatory per TI's validated reference design-omitting them degrades OVP accuracy, noise immunity, and thermal stability in BQ294706DSGR implementations.