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Texas Instruments BQ294624DRVR
- Part No.:
- BQ294624DRVR
- Manufacturer:
- Texas Instruments
- Category:
- Battery Management
- Package:
- 6-WDFN Exposed Pad
- Datasheet:
-
BQ294624DRVR.pdf
- Description:
- IC BATT PROT LI-ION 1CELL 6WSON
- Quantity:
- Payment:
- Shipping:
Inventory:2,997
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Product details
Overview
BQ294624DRVR from Texas Instruments is a single-cell secondary overvoltage protector IC for Li-ion battery packs, featuring a factory-programmed 4.45 V OVP threshold, 6.5 s fixed delay timer, ±10 mV OVP accuracy, <1 µA supply current (VCELL < VPROTECT), and <100 nA per-cell input leakage. It drives an external N-channel FET to blow a fuse during overvoltage faults in portable tablets and slates.
For engineers reviewing the BQ294624DRVR datasheet, BQ294624DRVR pinout, BQ294624DRVR application, or BQ294624DRVR equivalent, this page delivers verified electrical specs, thermal metrics, functional mode behavior, real-world timing diagrams, and validated alternative options for second-level battery protection design.
Technical Context
The BQ294624DRVR implements a dedicated analog comparator-based overvoltage detection circuit with internal reference and fixed-delay timer logic. Its output transitions high only after V1 exceeds 4.45 V for exactly 6.5 seconds, then resets low when V1 falls below (4.45 V – 300 mV hysteresis). No digital configuration or external clock is required.
It operates across –40°C to +110°C with 3–8 V unregulated VDD supply, uses dual VSS pins for robust ground referencing, and requires RC filtering on V1 and VDD per TI's layout guidelines. The thermal pad (PWRPAD) must be soldered to PCB VSS for proper thermal dissipation and functional stability.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| OVP Threshold | 4.45 V ±10 mV at 25°C - precise trip point for Li-ion cell voltage limiting, minimizing false triggers while ensuring safe cutoff before electrolyte decomposition. |
| OVP Delay Time | 6.5 s (fixed) - provides sufficient time for transient spikes to settle before initiating fuse-blow action, avoiding nuisance shutdowns. |
| Supply Current | 1 µA typical (VCELL < VPROTECT) - enables ultra-low-power operation in always-on battery protection circuits without impacting pack standby life. |
| Input Leakage | <100 nA per V1 pin - preserves cell voltage measurement integrity and prevents parasitic discharge in high-impedance sensing paths. |
| Operating Temp | –40°C to +110°C - supports deployment in thermally demanding consumer and industrial portable equipment environments. |
| Output Drive | High-side open-drain OUT capable of sinking ≥1.5 mA - directly interfaces with gate of external NMOS FET to short fuse to ground during fault. |
| Package | 6-pin WSON (DRV), 2.0 mm × 2.0 mm, 0.8 mm max height - compact footprint ideal for space-constrained battery pack PCB layouts. |
Pinout & Package
Package: WSON-6 (DRV), 2.0 mm × 2.0 mm body, exposed thermal pad (PWRPAD) electrically connected to VSS. Requires soldering PWRPAD to PCB ground plane for thermal management and functional reliability.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| OUT (Pin 6) | Open-drain output | Drives gate of external N-channel FET; goes high after OVP + 6.5 s delay to initiate fuse blow; resets low when V1 drops below hysteresis threshold. |
| V1 (Pin 2) | Analog sense input | Connects directly to positive terminal of Li-ion cell; requires external RIN/CIN RC filter for noise immunity and stable voltage monitoring. |
| VSS (Pins 3 & 4) | Ground reference | Both pins must be externally tied to CELL–; dual connection reduces ground impedance and improves noise rejection in high-current fuse-blow events. |
| VDD (Pin 5) | Unregulated power supply | Accepts 3–8 V; requires external RVD/CVD RC filter; powers internal comparator, timer, and output driver circuits. |
| NC (Pin 1) | No connection | Internally unused; must remain floating or grounded per layout best practice-no signal routing permitted. |
Key Features
| Feature | Design Value |
|---|---|
| Factory-programmed OVP | 4.45 V threshold eliminates need for external resistor dividers or calibration, reducing BOM count and layout complexity. |
| Fixed 6.5 s delay timer | Hardwired timing ensures deterministic fault response without software dependency or capacitor tolerance drift. |
| ±10 mV OVP accuracy | Enables tight voltage margin control for modern high-voltage Li-ion chemistries (e.g., NMC, LCO) without overdesign. |
| Sub-1 µA quiescent current | Extends battery shelf life and minimizes self-discharge impact in long-term storage applications like medical or backup devices. |
| Dual VSS pins + PWRPAD | Provides low-impedance ground path and thermal conduction to PCB, critical for reliable operation during high-current fuse activation. |
Applications
| Tablet Battery Protection | Slate Power Management |
|---|---|
|
Use Scenario: Secondary overvoltage protection in 1-cell Li-ion battery packs for Android/iOS tablets operating under variable charging conditions and thermal stress. IC Role / Device Role / Timing Role: Monitors cell voltage continuously; asserts OUT after 6.5 s if V1 ≥ 4.45 V to trigger external NMOS and blow fuse, cutting off charge path. Use Value: Prevents catastrophic cell venting or thermal runaway by enforcing strict 4.45 V ceiling with minimal false positives due to ±10 mV accuracy and hysteresis. |
Use Scenario: Safety-critical overvoltage guard in premium slate PCs where primary protection may fail during fast-charging or adapter fault conditions. IC Role / Device Role / Timing Role: Acts as independent hardware-based backup monitor; outputs high-level signal only after confirmed 6.5 s overvoltage event, enabling controlled fuse activation. Use Value: Adds certified second-layer safety compliance (IEC 62133, UL 2054) without firmware involvement, meeting OEM functional safety requirements. |
| Portable Instrumentation | Medical Handheld Devices |
|
Use Scenario: Overvoltage safeguard in handheld test equipment (e.g., multimeters, spectrum analyzers) powered by removable Li-ion packs. IC Role / Device Role / Timing Role: Senses cell voltage via V1; holds OUT low during normal operation; transitions OUT high post-6.5 s delay to activate fuse-blow circuit upon sustained overvoltage. Use Value: Ensures field-replaceable batteries cannot exceed safe voltage limits even if primary charger IC malfunctions, protecting sensitive analog front-ends. |
Use Scenario: Redundant cell protection in battery-powered medical diagnostics tools requiring regulatory-certified fault containment. IC Role / Device Role / Timing Role: Provides autonomous, analog-only OVP response with no software stack; dual VSS pins ensure ground integrity during ESD-sensitive clinical use. Use Value: Meets IEC 60601-1 collateral standard for battery safety by delivering predictable, temperature-stable trip behavior (±10 mV, –40°C to +110°C). |
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 6-pin WSON package and 6.5 s delay, but OVP threshold is 4.35 V instead of 4.45 V. | Targeted for lower-voltage Li-ion cells or designs requiring earlier trip point to accommodate tighter voltage margins. | Select when system-level validation confirms 4.35 V OVP provides optimal balance between safety margin and usable cell capacity. |
| BQ294682DRVR | Same package and 4 s delay, but OVP threshold is 4.225 V - lowest in family and optimized for legacy or LFP-compatible cells. | Suitable for cost-sensitive portable equipment where faster response (4 s vs 6.5 s) and lower trip voltage are acceptable trade-offs. | Choose only if application tolerates reduced overvoltage headroom and shorter fault confirmation window; verify hysteresis compatibility. |
Compared with BQ294624DRVR, BQ294604DRVR offers identical timing but lower OVP for conservative cell voltage control, while BQ294682DRVR trades both threshold and delay for faster, lower-voltage protection - neither is pin-compatible nor drop-in; all require board-level validation of trip point and timing behavior.
Availability
BQ294624DRVR is available at Aetrix Electronics and suitable for tablet battery protection, slate power management, and portable instrumentation requiring stable component supply, long-lifecycle support, and automotive-grade temperature range (–40°C to +110°C).
Supply support for BQ294624DRVR 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 specializing in analog, embedded processing, and power management technologies, with decades of expertise in battery safety ICs and high-reliability analog design.
The BQ2946xx product line was developed specifically for secondary-level overvoltage protection in single-cell Li-ion battery packs, targeting consumer electronics and portable instrumentation where precision, low power, and small size are critical.
FAQ
What is the exact overvoltage protection threshold and accuracy of the BQ294624DRVR?
The BQ294624DRVR has a factory-programmed overvoltage protection (OVP) threshold of 4.45 V with ±10 mV accuracy at 25°C. This specification is guaranteed across –40°C to +110°C, with additional drift data provided in the datasheet showing worst-case deviation of ±54 mV at temperature extremes. The BQ294624DRVR achieves this using trimmed internal references and matched comparator architecture.
How does the BQ294624DRVR reset after triggering overvoltage protection?
The BQ294624DRVR resets its OUT pin to low when the sensed cell voltage (V1) drops below the OVP threshold minus hysteresis - specifically, below (4.45 V – 300 mV) = 4.15 V. This hysteresis prevents oscillation near the trip point and ensures clean recovery. The reset occurs immediately upon crossing the hysteresis threshold; no additional delay is applied.
Can the BQ294624DRVR operate without external RC filters?
No - the BQ294624DRVR requires external RC filters on both V1 (sense input) and VDD (supply) pins as specified in the datasheet. Recommended values are RIN = 1 kΩ / CIN = 0.1 µF for V1 and RVD = 1 kΩ / CVD = 0.1 µF for VDD. Omitting these filters risks false OVP triggering due to noise or instability, and violates TI's validated layout guidance for the BQ294624DRVR.
What is the function of the NC pin (Pin 1) on the BQ294624DRVR?
Pin 1 of the BQ294624DRVR is designated NC (No Connection) and is internally unused. It must not be connected to any signal or power net. TI recommends leaving it floating or optionally grounding it to minimize potential coupling - but never routing traces or placing vias directly to Pin 1. This applies strictly to the BQ294624DRVR; other variants in the family share the same pinout.
Does the BQ294624DRVR support customer test mode (CTM), and how is it enabled?
Yes, the BQ294624DRVR supports Customer Test Mode (CTM) to accelerate production testing of the OVP delay timer. CTM is enabled by applying VDD at least 10 V higher than V1 (e.g., V1 = 4.2 V, VDD = 14.2 V). This reduces the delay from 6.5 s to >10 ms while preserving functional behavior. The BQ294624DRVR exits CTM automatically when the VDD–V1 differential falls below 10 V.
BQ294624DRVR 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)
BQ294624DRVR FAQ
1.How can I place an order for BQ294624DRVR through Aetrix?
Please submit a Request for Quotation (RFQ) for BQ294624DRVR 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 BQ294624DRVR reliable?
The price and inventory of BQ294624DRVR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BQ294624DRVR is usually 5 days.
3.What payment methods are accepted for BQ294624DRVR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BQ294624DRVR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BQ294624DRVR?
BQ294624DRVR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BQ294624DRVR 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 BQ294624DRVR?
For technical support, including BQ294624DRVR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BQ294624DRVR requirements.
6.How does Aetrix verify that BQ294624DRVR is sourced from the original manufacturer or authorized distributors?
All BQ294624DRVR 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 BQ294624DRVR meets industry standards.
7.What is the process for return or replacement of BQ294624DRVR?
All BQ294624DRVR units undergo pre-shipment inspection (PSI). If there is an issue with BQ294624DRVR, 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 BQ294624DRVR part is unused and in its original packaging.
Return procedure for BQ294624DRVR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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