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Texas Instruments BQ294682DRVT
- Part No.:
- BQ294682DRVT
- Manufacturer:
- Texas Instruments
- Category:
- Battery Management
- Package:
- 6-WDFN Exposed Pad
- Datasheet:
-
BQ294682DRVT.pdf
- Description:
- IC BATT PROT LI-ION 1CELL 6WSON
- Quantity:
- Payment:
- Shipping:
Inventory:2,674
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Product details
Overview
BQ294682DRVT from Texas Instruments is a single-cell lithium-ion battery secondary overvoltage protector IC with fixed 4.225 V OVP threshold, ±10 mV accuracy at 25°C, 4 s fault detection delay, and ultra-low 1 µA supply current (VCELL < VPROTECT). It drives an external N-channel FET to blow a fuse during overvoltage events in portable power systems.
For engineers reviewing the BQ294682DRVT datasheet, BQ294682DRVT pinout, BQ294682DRVT application, or BQ294682DRVT equivalent, this page delivers verified technical context, validated pin functions, confirmed operating conditions (–40°C to +110°C), and real-world implementation constraints for second-level battery protection design.
Technical Context
The BQ294682DRVT implements a fixed-threshold, fixed-delay overvoltage detection architecture: cell voltage (V1) is compared against factory-programmed 4.225 V; upon exceedance, a 4-second internal timer activates before asserting high on OUT. Hysteresis is fixed at 300 mV (typical), ensuring stable reset when V1 falls below 3.925 V.
It operates from 3 V to 8 V on VDD, supports dual VSS pins for low-impedance ground return, and requires external RC filtering on V1 and VDD per TI's layout guidelines. The thermal pad (PWRPAD) must be connected to VSS on PCB for proper thermal and electrical performance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| OVP Threshold | 4.225 V - Factory-programmed fixed trip point; triggers protection when cell voltage exceeds this value. |
| OVP Accuracy | ±10 mV at 25°C - Enables precise cell voltage monitoring without calibration overhead. |
| Delay Time | 4 s - Fixed internal timer duration between OVP detection and OUT assertion; prevents false trips from transient spikes. |
| Supply Current | 1 µA (typical) when VCELL < VPROTECT - Minimizes standby power drain in battery-powered systems. |
| Input Leakage | <100 nA per cell input - Preserves battery charge integrity during long-term storage or idle states. |
| Operating Temp | –40°C to +110°C - Validated for use in consumer tablets, slates, and industrial portable equipment environments. |
| Output Drive | High-side open-drain capable of sourcing ≥1.5 mA (short-circuit); designed to drive gate of external NMOS FET. |
Pinout & Package
Package: WSON-6 (DRV), 2.0 mm × 2.0 mm body, 0.8 mm max height, exposed thermal pad (PWRPAD) electrically tied to VSS.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| OUT (Pin 6) | Output driver | Open-drain output that goes high to activate external N-channel FET; resets low when V1 drops below (VOV – VHYS). |
| V1 (Pin 2) | Sense input | Positive terminal monitor for single Li-ion cell; requires external RIN/CIN filter for noise immunity. |
| VSS (Pins 3 & 4) | Ground reference | Dual ground pins-both must connect externally to CELL– terminal for accurate sensing and thermal path. |
| VDD (Pin 5) | Power supply | Unregulated input (3–8 V); requires external RVD/CVD filter; enables CTM mode when biased ≥10 V above V1. |
| NC (Pin 1) | No connection | Unused pin; no internal connection; must remain unconnected per datasheet. |
Key Features
| Feature | Design Value |
|---|---|
| Fixed OVP threshold | 4.225 V - Eliminates external resistor programming; ensures consistent trip point across production units. |
| Factory-trimmed accuracy | ±10 mV at 25°C - Reduces need for system-level calibration and improves safety margin control. |
| Low-quiescent current | 1 µA typical - Extends shelf life and runtime in always-on battery protection circuits. |
| Dual VSS pins | Provides dedicated ground paths for sense and power domains - lowers noise coupling and improves measurement stability. |
| Customer Test Mode (CTM) | 15 ms delay in test mode - Accelerates functional verification during pack manufacturing without full 4 s wait. |
Applications
| Tablet Battery Pack Protection | Portable Medical Instrumentation |
|---|---|
Use Scenario: Secondary overvoltage safeguard in multi-layer Li-ion battery packs used in Android/iOS tablets where primary protection resides in fuel gauge or charger IC. IC Role / Device Role / Timing Role: Standalone hardware-based OVP monitor that asserts OUT after fixed 4 s delay to trigger fuse-blowing FET independent of firmware or host controller. Use Value: Adds fail-safe redundancy against charger malfunction or software lockup, meeting IEC 62133 safety requirements for portable electronics. |
Use Scenario: Overvoltage cutoff in handheld diagnostic devices (e.g., ultrasound probes, glucose meters) requiring certified battery safety under UL 2054. IC Role / Device Role / Timing Role: Second-level protector interfacing directly with cell terminals; uses fixed 4.225 V threshold aligned with common Li-ion chemistry upper limits. Use Value: Ensures compliance with medical device safety standards by providing deterministic, temperature-stable trip behavior without microcontroller dependency. |
| Industrial Handheld Scanner | Wearable Health Monitor |
Use Scenario: Fuse-triggering OVP circuit in ruggedized barcode scanners operating across wide ambient temperatures (–20°C to +70°C). IC Role / Device Role / Timing Role: Voltage monitor with –40°C to +110°C operational range; dual VSS pins reduce ground bounce in noisy motor-driven environments. Use Value: Maintains reliable protection during cold-start or hot-operation scenarios where primary protection may drift or fail. |
Use Scenario: Compact secondary protection in slim-profile wearable ECG/SpO₂ monitors where board space and leakage current are critical. IC Role / Device Role / Timing Role: Ultra-low-leakage (<100 nA) cell monitor enabling multi-month shelf life without significant self-discharge impact. Use Value: Preserves battery capacity during long-term storage while delivering precise 4.225 V trip point matching typical LiCoO₂ full-charge voltage. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar single-cell overvoltage protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BQ294602DRVT | OVP threshold = 4.35 V; same 4 s delay, package, and pinout. | Targeted for higher-voltage Li-ion chemistries (e.g., LiMn₂O₄) or designs requiring wider safety margin above nominal 4.2 V. | Select when system requires higher trip voltage without changing layout or firmware logic. |
| BQ294604DRVT | OVP threshold = 4.35 V; 6.5 s delay instead of 4 s; otherwise identical pinout and package. | Suitable for applications needing longer transient immunity (e.g., chargers with slow-rising voltage profiles). | Choose if extended delay is required to avoid nuisance trips during normal charging transitions. |
Compared with BQ294682DRVT, BQ294602DRVT raises OVP by 125 mV for tighter chemistry alignment, while BQ294604DRVT extends delay by 2.5 s for improved noise immunity-both retain identical footprint and interface compatibility.
Availability
BQ294682DRVT is available at Aetrix Electronics and suitable for tablet battery packs, portable medical instrumentation, industrial handheld scanners, and wearable health monitors requiring stable component supply with guaranteed long-term lifecycle support.
Supply support for BQ294682DRVT 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, embedded processing, and power management technologies, with over 90 years of innovation in industrial, automotive, and consumer electronics.
The BQ2946xx family is part of TI's battery management portfolio, designed specifically for hardware-based secondary overvoltage protection in single-cell Li-ion battery packs where reliability and independence from firmware are critical.
FAQ
What is the exact overvoltage protection threshold of the BQ294682DRVT?
The BQ294682DRVT has a factory-programmed fixed overvoltage protection (OVP) threshold of 4.225 V. This value is trimmed during production and specified with ±10 mV accuracy at 25°C. The threshold remains stable across temperature, with drift bounded by ±54 mV from –40°C to +110°C per datasheet Section 6.5.
Does the BQ294682DRVT require external components to operate?
Yes, the BQ294682DRVT requires external RC filters: a 1 kΩ resistor (RIN) and 0.1 µF capacitor (CIN) on the V1 sense input, and a 1 kΩ resistor (RVD) and 0.1 µF capacitor (CVD) on the VDD supply line. These components suppress noise and ensure stable operation per TI's recommended layout in Section 10.1.
How does the BQ294682DRVT reset after triggering overvoltage protection?
The BQ294682DRVT resets automatically when the sensed cell voltage (V1) drops below the OVP threshold minus hysteresis (4.225 V – 300 mV = 3.925 V). Upon crossing this lower threshold, the OUT pin transitions low within microseconds, releasing the external FET and halting fuse-blowing action.
Can the BQ294682DRVT be used in automotive applications?
The BQ294682DRVT is rated for –40°C to +110°C operating temperature and meets JEDEC JESD22-A114 HBM ±2000 V ESD rating, but it is not AEC-Q200 qualified. It is intended for industrial and consumer portable equipment-not automotive safety-critical systems-per TI's published device classification and qualification status.
What is the purpose of the NC pin on the BQ294682DRVT?
Pin 1 of the BQ294682DRVT is marked NC (No Connection) and has no internal connection. It must remain unconnected on the PCB per TI's datasheet Table 5-1. Routing or soldering to this pin may cause unintended electrical behavior or violate thermal pad grounding requirements.
BQ294682DRVT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 6-WDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Battery Protection
- Battery Chemistry:
- Lithium Ion
- Number of Cells:
- 1
- Fault Protection:
- Over Voltage
- Interface:
- -
- Operating Temperature:
- -40°C ~ 110°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 6-WSON (2x2)
BQ294682DRVT FAQ
1.How can I place an order for BQ294682DRVT through Aetrix?
Please submit a Request for Quotation (RFQ) for BQ294682DRVT on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for BQ294682DRVT reliable?
The price and inventory of BQ294682DRVT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BQ294682DRVT is usually 5 days.
3.What payment methods are accepted for BQ294682DRVT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BQ294682DRVT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BQ294682DRVT?
BQ294682DRVT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BQ294682DRVT order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for BQ294682DRVT?
For technical support, including BQ294682DRVT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BQ294682DRVT requirements.
6.How does Aetrix verify that BQ294682DRVT is sourced from the original manufacturer or authorized distributors?
All BQ294682DRVT products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that BQ294682DRVT meets industry standards.
7.What is the process for return or replacement of BQ294682DRVT?
All BQ294682DRVT units undergo pre-shipment inspection (PSI). If there is an issue with BQ294682DRVT, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The BQ294682DRVT part is unused and in its original packaging.
Return procedure for BQ294682DRVT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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