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Texas Instruments BQ294502DRVR
- Part No.:
- BQ294502DRVR
- Manufacturer:
- Texas Instruments
- Category:
- Battery Management
- Package:
- 6-WDFN Exposed Pad
- Datasheet:
-
BQ294502DRVR.pdf
- Description:
- IC BATT PROT LI-ION 2-3CEL 6WSON
- Quantity:
- Payment:
- Shipping:
Inventory:1,815
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Product details
Overview
BQ294502DRVR from Texas Instruments is a secondary overvoltage protection IC for 2- or 3-series Li-ion battery packs, featuring fixed 4.35 V OVP threshold, ±10 mV accuracy, and 4 s fault detection delay. It independently monitors each cell voltage and drives an external N-channel FET to trigger fuse blow during overvoltage events in portable power tools and tablets.
For engineers reviewing the BQ294502DRVR datasheet, BQ294502DRVR pinout, BQ294502DRVR application, or BQ294502DRVR equivalent, key selection criteria include OVP threshold tolerance, low 1 µA quiescent current, 6-pin WSON package footprint, and compatibility with 2-/3-cell stack configurations requiring secondary-level safety redundancy.
Technical Context
The BQ294502DRVR implements independent analog sensing per cell (V1–VSS, V2–V1, V3–V2) using a multiplexer-based architecture with factory-programmed 4.35 V overvoltage threshold and fixed 4 s delay timer. Its output transitions high only after sustained overvoltage exceeds threshold for full delay duration.
It operates across –40°C to +110°C ambient, supports unregulated VDD input from 3 V to 25 V, and integrates thermal pad (PWRPAD) tied to VSS for thermal management. The device enters Customer Test Mode when VDD exceeds V3 by ≥10 V, reducing delay to >15 ms for production validation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| OVP Threshold | 4.35 V ±10 mV at 25°C - ensures precise secondary overvoltage cutoff before cell degradation begins. |
| Delay Time | 4 s (typical), 3.2–4.8 s over temperature - provides deterministic response window for fuse activation without nuisance tripping. |
| Supply Current | 1 µA (max) when all cells below VOV - enables multi-year operation on battery standby without significant drain. |
| Input Leakage | <100 nA per cell input - minimizes measurement error and preserves cell balancing integrity. |
| Operating Temp | –40°C to +110°C - supports use in power tools and industrial portable equipment with wide thermal excursions. |
| Output Drive | Drives NMOS gate with VOH ≥ VDD – 0.2 V, IOUT(short) = 4.5 mA - directly interfaces standard low-threshold N-channel FETs. |
| Hysteresis | 250–400 mV - prevents oscillation during recovery near threshold and ensures clean reset after overvoltage clears. |
Pinout & Package
Package: 6-pin WSON (DRV), 2.00 mm × 2.00 mm body size, exposed thermal pad (PWRPAD) electrically connected to VSS.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| V1 | Sense input for lowest cell (Cell 1) | Connects to positive terminal of bottom cell; requires RC filter for noise immunity and stable monitoring. |
| V2 | Sense input for middle cell (Cell 2) | Connects to positive terminal of second cell; differential voltage (V2–V1) monitored for overvoltage condition. |
| VSS | Ground reference and lowest cell negative | Common return for IC and battery stack negative; must be connected to PWRPAD on PCB for thermal and functional integrity. |
| V3 | Sense input for top cell (Cell 3) | Connects to positive terminal of top cell in 3-series config; in 2-series, shorted to V2 per datasheet guidance. |
| VDD | Unregulated power supply input | Accepts 3–25 V; requires series resistor and bypass capacitor to limit inrush and suppress supply noise. |
| OUT | Active-high output driver | Drives gate of external N-channel FET to short fuse to ground during overvoltage; resets low when all cells fall below (VOV – VHYS). |
Key Features
| Feature | Design Value |
|---|---|
| Factory-programmed OVP | Fixed 4.35 V threshold eliminates external resistor network and calibration overhead in production. |
| Independent cell monitoring | Three dedicated analog inputs (V1/V2/V3) enable true per-cell overvoltage detection in stacked configurations. |
| Low-power standby | 1 µA ICC enables integration into always-on battery protection circuits without compromising runtime. |
| Customer Test Mode (CTM) | Reduces OVP delay to >15 ms via VDD–V3 ≥10 V, accelerating functional test during pack assembly. |
| Thermal pad integration | PWRPAD tied to VSS improves thermal dissipation and ensures stable operation under continuous load conditions. |
Applications
| Power Tools | Tablets |
|---|---|
Use Scenario: Cordless drill battery packs subject to fast charging and high-current discharge cycles that risk individual cell overvoltage. IC Role / Device Role / Timing Role: Secondary overvoltage protector triggering fuse blow within 4 s of sustained >4.35 V on any cell. Use Value: Prevents thermal runaway by enforcing hard voltage cutoff before cell chemistry degrades, meeting UL 2054 and IEC 62133 requirements. |
Use Scenario: Slim-profile tablet batteries where space constraints limit protection circuit complexity and heat dissipation. IC Role / Device Role / Timing Role: Compact 2.0 mm × 2.0 mm WSON IC providing independent cell monitoring without external components. Use Value: Enables reliable secondary protection in ultra-thin designs while consuming only 1 µA in standby-extending shelf life and reducing self-discharge. |
| Notebook Computers | Portable Instrumentation |
Use Scenario: Multi-cell laptop battery modules operating across wide ambient temperatures (–20°C to +60°C) during travel and field use. IC Role / Device Role / Timing Role: Temperature-stable OVP monitor with ±10 mV accuracy and <400 mV hysteresis across –40°C to +110°C. Use Value: Maintains consistent trip point over temperature, eliminating false trips during cold starts or hot operation-critical for OEM warranty compliance. |
Use Scenario: Handheld test equipment requiring long-term storage and infrequent use with guaranteed cell safety during dormant periods. IC Role / Device Role / Timing Role: Ultra-low leakage (<100 nA/cell) sensor preserving cell balance and minimizing parasitic drain over months of storage. Use Value: Ensures battery remains within safe voltage window during extended shelf life, preventing irreversible capacity loss or swelling. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar overvoltage protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BQ294504DRVR | Same 4.35 V OVP threshold but 6.5 s delay (vs. 4 s) | Preferred where slower response reduces false trips in noisy environments or high-impedance cell sensing | Select when system design tolerates longer fault detection latency for improved noise immunity. |
| BQ294506DRVR | 4.38 V OVP threshold (30 mV higher), same 4 s delay | Used where tighter cell voltage margin is needed before secondary cutoff, e.g., high-voltage Li-ion chemistries | Choose when primary protection allows higher cell voltage ceiling and secondary threshold must align accordingly. |
Compared with BQ294502DRVR, BQ294504DRVR trades faster response for enhanced noise robustness, while BQ294506DRVR shifts the safety margin upward-both retain identical pinout, package, and interface behavior for drop-in layout reuse.
Availability
BQ294502DRVR is available at Aetrix Electronics and suitable for power tools, tablets, and notebook computers requiring stable component supply with full lifecycle support and traceable sourcing.
Supply support for BQ294502DRVR 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 solutions, with leadership in battery management and precision analog ICs.
The BQ2945xy family was designed specifically for secondary overvoltage protection in multi-cell Li-ion battery packs, targeting high-reliability portable and industrial applications demanding factory-trimmed accuracy and minimal external components.
FAQ
What is the overvoltage protection threshold and accuracy of the BQ294502DRVR?
The BQ294502DRVR has a factory-programmed overvoltage protection threshold of 4.35 V with ±10 mV accuracy at 25°C. This tight tolerance ensures reliable secondary cutoff before cell damage occurs, and its drift remains bounded across –40°C to +110°C per datasheet specifications. The BQ294502DRVR maintains this accuracy without external calibration components.
How does the BQ294502DRVR interface with the external MOSFET in a battery pack?
The BQ294502DRVR drives the gate of an external N-channel MOSFET via its open-drain–compatible OUT pin, which pulls high (to VDD – 0.2 V) during overvoltage to activate the FET and short the fuse to ground. The BQ294502DRVR delivers up to 4.5 mA short-circuit current and supports direct connection to standard logic-level NMOS devices without level-shifting circuitry.
Can the BQ294502DRVR be used in both 2-cell and 3-cell Li-ion battery configurations?
Yes, the BQ294502DRVR supports both 2-series and 3-series Li-ion configurations. In 2-cell setups, V3 is shorted to V2 per TI's application guidance. All three sense inputs (V1, V2, V3) remain functional, and the internal multiplexer automatically adapts monitoring to the active cell count-no configuration pins or firmware required for the BQ294502DRVR.
What is the purpose of the PWRPAD on the BQ294502DRVR package?
The PWRPAD on the BQ294502DRVR is an exposed thermal pad that must be electrically connected to the VSS net on the PCB. This connection provides critical thermal conduction path to the board, lowers junction-to-board resistance (RθJB = 110.7°C/W), and ensures stable operation under continuous monitoring duty cycles. Leaving PWRPAD unconnected compromises thermal performance and may affect long-term reliability of the BQ294502DRVR.
Does the BQ294502DRVR include any built-in test features for production validation?
Yes, the BQ294502DRVR supports Customer Test Mode (CTM), activated by applying VDD ≥10 V above V3. In CTM, the overvoltage delay reduces from 4 s to >15 ms-enabling rapid functional verification of the protection path during battery pack manufacturing. The BQ294502DRVR exits CTM automatically when the VDD–V3 differential drops below threshold, simplifying test automation without additional control signals.
BQ294502DRVR 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:
- 2 ~ 3
- Fault Protection:
- Over Voltage
- Interface:
- -
- Operating Temperature:
- -40°C ~ 110°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 6-WSON (2x2)
BQ294502DRVR FAQ
1.How can I place an order for BQ294502DRVR through Aetrix?
Please submit a Request for Quotation (RFQ) for BQ294502DRVR 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 BQ294502DRVR reliable?
The price and inventory of BQ294502DRVR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BQ294502DRVR is usually 5 days.
3.What payment methods are accepted for BQ294502DRVR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BQ294502DRVR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BQ294502DRVR?
BQ294502DRVR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BQ294502DRVR 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 BQ294502DRVR?
For technical support, including BQ294502DRVR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BQ294502DRVR requirements.
6.How does Aetrix verify that BQ294502DRVR is sourced from the original manufacturer or authorized distributors?
All BQ294502DRVR 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 BQ294502DRVR meets industry standards.
7.What is the process for return or replacement of BQ294502DRVR?
All BQ294502DRVR units undergo pre-shipment inspection (PSI). If there is an issue with BQ294502DRVR, 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 BQ294502DRVR part is unused and in its original packaging.
Return procedure for BQ294502DRVR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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