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Texas Instruments BQ294602DRVR
- Part No.:
- BQ294602DRVR
- Manufacturer:
- Texas Instruments
- Category:
- Battery Management
- Package:
- 6-WDFN Exposed Pad
- Datasheet:
-
BQ294602DRVR.pdf
- Description:
- IC BATT PROT LI-ION 1CELL 6WSON
- Quantity:
- Payment:
- Shipping:
Inventory:338
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Product details
Overview
BQ294602DRVR from Texas Instruments is a single-cell secondary overvoltage protector IC for Li-ion battery packs, featuring a factory-programmed 4.35 V ±10 mV OVP threshold, 4 s fixed delay timer, and high-accuracy monitoring with <100 nA input leakage. It drives an external N-channel FET to activate fuse-blowing during overvoltage events in portable tablets and slates.
For engineers reviewing the BQ294602DRVR datasheet, BQ294602DRVR pinout, BQ294602DRVR application, or BQ294602DRVR equivalent, key selection criteria include OVP accuracy (±10 mV), ultra-low ICC (~1 µA), dual VSS ground pins, thermal pad (PWRPAD) connection requirement, and WSON-6 package compatibility with space-constrained battery pack layouts.
Technical Context
The BQ294602DRVR implements a dedicated analog comparator architecture comparing V1 against a precision internal reference to detect overvoltage. Upon threshold breach, a fixed 4 s digital delay timer activates before asserting the open-drain OUT signal to drive an external NMOS gate.
It operates across –40°C to +110°C with supply voltage range 3–8 V on VDD, supports Customer Test Mode (CTM) via VDD–V1 ≥10 V for accelerated delay validation, and requires RC filtering on both V1 and VDD inputs per TI layout guidelines to ensure noise-immune cell voltage monitoring.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| OVP Threshold | 4.35 V ±10 mV at 25°C - sets precise overvoltage trip point for Li-ion cell safety cutoff |
| OVP Delay Time | 4 s (fixed) - provides controlled response window before fuse activation to avoid false triggers |
| Supply Current (ICC) | ~1 µA at VCELL < VPROTECT - enables multi-year battery shelf life without significant drain |
| Input Leakage (IIN) | <100 nA per V1 pin - preserves cell voltage integrity and avoids measurement error |
| Operating Temp Range | –40°C to +110°C - supports operation in thermally aggressive portable and industrial battery environments |
| Hysteresis (VHYS) | 300 mV typical - prevents oscillation near trip threshold by requiring ~4.05 V recovery before reset |
| Output Drive | Open-drain OUT capable of sinking ≥100 µA at ≤400 mV - directly interfaces with standard NMOS gate drivers |
Pinout & Package
Package: WSON-6 (DRV), 2.0 mm × 2.0 mm, 0.8 mm max height, exposed thermal pad (PWRPAD) electrically tied to VSS.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| OUT | Open-drain output | Drives gate of external N-channel FET; pulled high during OVP fault to initiate fuse blow |
| VDD | Unregulated power supply input | Accepts 3–8 V; requires series resistor + bypass capacitor for noise filtering and current limiting |
| NC | No-connect terminal | Pin 1 is unconnected internally; must remain floating or grounded per layout best practice |
| V1 | Positive cell voltage sense input | Monitors single Li-ion cell anode; requires RC filter (RIN/CIN) for EMI immunity and stable reading |
| VSS (Pin 3) | Ground reference | Primary IC ground; must be externally connected to battery pack's CELL– terminal |
| VSS (Pin 4) | Secondary ground reference | Dual VSS pins reduce ground impedance and improve noise rejection; both connect to CELL– |
Key Features
| Feature | Design Value |
|---|---|
| Factory-programmed OVP | 4.35 V threshold eliminates need for external resistor divider or calibration in production |
| Fixed 4 s delay timer | Guarantees consistent fault response timing without external timing components or firmware dependency |
| Thermal pad (PWRPAD) | Exposed bottom pad tied to VSS improves thermal dissipation and PCB grounding for reliable high-temp operation |
| Customer Test Mode (CTM) | Enables sub-20 ms delay verification during pack testing using only VDD–V1 voltage differential |
| Low-temperature drift | OVP threshold variation ≤ ±54 mV from –40°C to +110°C ensures robust protection across full operating range |
Applications
| Tablet Battery Protection | Slate Power Management |
|---|---|
Use Scenario: Secondary overvoltage safeguard in slim-profile tablet battery packs where primary protection may fail. IC Role / Device Role / Timing Role: Standalone hardware-based OVP monitor that asserts OUT after 4 s to trigger NMOS-driven fuse blow. Use Value: Prevents thermal runaway by enforcing strict 4.35 V cutoff with ±10 mV accuracy, independent of host system firmware. |
Use Scenario: Redundant cell voltage supervision in slate devices with tight PCB space and high ambient temperature exposure. IC Role / Device Role / Timing Role: Dual-VSS, thermally enhanced protector operating up to +110°C with minimal self-heating (<1 µA ICC). Use Value: Maintains reliable trip point stability across temperature (±54 mV drift) while enabling compact 2.0×2.0 mm layout footprint. |
| Portable Instrumentation | Medical Handheld Devices |
Use Scenario: Safety-critical overvoltage guard in battery-powered test equipment requiring long shelf life and field reliability. IC Role / Device Role / Timing Role: Ultra-low-leakage (≤100 nA) sensor interface that preserves cell voltage integrity during storage and standby. Use Value: Extends usable shelf life by minimizing parasitic drain, while hysteresis (300 mV) prevents nuisance tripping during transient load recovery. |
Use Scenario: Certified secondary protection layer in Class II medical handhelds where battery failure could impact patient safety. IC Role / Device Role / Timing Role: Hardware-enforced, non-software-dependent OVP stage compliant with IEC 62133 secondary protection requirements. Use Value: Delivers deterministic 4 s fault response with no firmware intervention-critical for regulatory auditability and functional safety justification. |
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 |
|---|---|---|---|
| BQ294604DRVR | Same 4.35 V OVP threshold but 6.5 s fixed delay instead of 4 s | Suitable for systems requiring longer fault confirmation window before fuse activation | Select when extended delay improves immunity to transient overvoltage spikes without compromising safety margin |
| BQ294624DRVR | 4.45 V OVP threshold (100 mV higher), 6.5 s delay, same package and pinout | Targets higher-voltage Li-ion chemistries or designs with tighter voltage headroom between charge termination and OVP | Choose only if system-level validation confirms safe operation at elevated trip point without violating cell specification limits |
Compared with BQ294602DRVR, BQ294604DRVR offers identical accuracy and package but extends delay for improved noise immunity, while BQ294624DRVR raises the trip threshold for higher-voltage cells-both require revalidation of fault timing and thermal behavior in the target pack.
Availability
BQ294602DRVR is available at Aetrix Electronics and suitable for tablet battery protection, slate power management, and portable instrumentation requiring stable component supply with guaranteed long-term manufacturability and RoHS-compliant WSON packaging.
Supply support for BQ294602DRVR 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 connectivity solutions with emphasis on reliability, precision, and power efficiency.
The BQ2946xx family is designed specifically for secondary-level hardware-based overvoltage protection in single-cell Li-ion battery packs, prioritizing accuracy, low power, and robustness in consumer and industrial portable applications.
FAQ
What is the exact overvoltage protection threshold and accuracy of the BQ294602DRVR?
The BQ294602DRVR has a factory-programmed overvoltage protection (OVP) threshold of 4.35 V with ±10 mV accuracy at 25°C. Over temperature (–40°C to +110°C), total drift remains within ±54 mV, ensuring consistent trip behavior across operating conditions. This value is laser-trimmed during manufacturing and does not require external calibration. The BQ294602DRVR datasheet specifies these parameters in Section 6.5, Table 1.1.
How does the BQ294602DRVR interface with the external MOSFET and fuse circuit?
The BQ294602DRVR drives the gate of an external N-channel MOSFET via its open-drain OUT pin. When overvoltage is detected and the 4 s delay expires, OUT pulls high (to VDD level), turning on the FET to short the fuse to ground. This allows battery or charger current to blow the fuse and disconnect the cell. The BQ294602DRVR itself does not integrate the FET or fuse-it provides only the control signal and timing logic.
Does the BQ294602DRVR require external passive components, and if so, which ones?
Yes-the BQ294602DRVR requires two 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 prevent false triggering. Both VSS pins must also be externally connected to the battery's CELL– terminal, and the PWRPAD thermal pad must be soldered to a VSS copper pour on the PCB.
What is the purpose of the NC pin (Pin 1) on the BQ294602DRVR?
Pin 1 of the BQ294602DRVR is a no-connect (NC) terminal with no internal connection. It must remain unconnected-neither tied to ground nor left floating in a way that risks solder bridging. TI's layout guidelines recommend keeping this pin isolated and avoiding routing traces beneath it. Its presence accommodates package standardization across the BQ2946xx family but serves no electrical function in the BQ294602DRVR.
Can the BQ294602DRVR be used in automotive applications?
No-the BQ294602DRVR is specified for –40°C to +110°C ambient operation and is not qualified to AEC-Q200 or ISO/TS 16949 automotive standards. While its temperature range overlaps with some under-hood environments, TI positions the BQ2946xx family exclusively for consumer and industrial portable equipment (e.g., tablets, slates, instrumentation). For automotive-grade battery protection, TI recommends the BQ77PL900 or BQ769x2 families instead of the BQ294602DRVR.
BQ294602DRVR 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)
BQ294602DRVR FAQ
1.How can I place an order for BQ294602DRVR through Aetrix?
Please submit a Request for Quotation (RFQ) for BQ294602DRVR 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 BQ294602DRVR reliable?
The price and inventory of BQ294602DRVR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BQ294602DRVR is usually 5 days.
3.What payment methods are accepted for BQ294602DRVR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BQ294602DRVR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BQ294602DRVR?
BQ294602DRVR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BQ294602DRVR 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 BQ294602DRVR?
For technical support, including BQ294602DRVR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BQ294602DRVR requirements.
6.How does Aetrix verify that BQ294602DRVR is sourced from the original manufacturer or authorized distributors?
All BQ294602DRVR 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 BQ294602DRVR meets industry standards.
7.What is the process for return or replacement of BQ294602DRVR?
All BQ294602DRVR units undergo pre-shipment inspection (PSI). If there is an issue with BQ294602DRVR, 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 BQ294602DRVR part is unused and in its original packaging.
Return procedure for BQ294602DRVR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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