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Texas Instruments BQ294504DRVT
- Part No.:
- BQ294504DRVT
- Manufacturer:
- Texas Instruments
- Category:
- Battery Management
- Package:
- 6-WDFN Exposed Pad
- Datasheet:
-
BQ294504DRVT.pdf
- Description:
- IC BATT PROT LI-ION 2-3CEL 6WSON
- Quantity:
- Payment:
- Shipping:
Inventory:1,250
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Product details
Overview
BQ294504DRVT 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, 6.5 s fault detection delay, ±10 mV accuracy, 1 µA supply current (VCELL < VPROTECT), and 6-pin SON package. 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 BQ294504DRVT datasheet, BQ294504DRVT pinout, BQ294504DRVT application, or BQ294504DRVT equivalent, key selection criteria include confirmed OVP threshold tolerance, thermal pad grounding requirement, independent cell sensing architecture, and compatibility with 2-/3-cell stack topologies requiring secondary-level safety redundancy.
Technical Context
The BQ294504DRVT implements independent analog sensing per cell (V1–VSS, V2–V1, V3–V2) using internal multiplexer-based comparators referenced to a factory-programmed 4.35 V overvoltage threshold. Detection triggers a fixed 6.5 s delay timer before asserting high-level OUT signal.
Its functional mode transitions between NORMAL (all cells below 4.35 V), OVERVOLTAGE (any cell ≥4.35 V for ≥6.5 s), and Customer Test Mode (CTM, activated by VDD–V3 ≥10 V). The PWRPAD thermal pad must be electrically tied to VSS on PCB for stable operation and thermal performance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| OVP Threshold | Fixed 4.35 V ±10 mV at 25°C; ensures precise secondary cutoff before cell degradation or thermal runaway. |
| OVP Delay Time | Fixed 6.5 s (typical); provides time-limited response window to distinguish transient spikes from sustained overvoltage faults. |
| Supply Current | ≈1 µA when all cell voltages are below VPROTECT; enables ultra-low-power monitoring in always-on battery protection circuits. |
| Input Leakage | <100 nA per cell input (V1/V2/V3); minimizes measurement error and preserves cell balance in high-impedance sensing networks. |
| Operating Temp | –40°C to +110°C ambient; supports deployment in power tools and industrial portable equipment with wide thermal envelopes. |
| Output Drive | Active-high open-drain OUT capable of sourcing ≥4.5 mA short-circuit current; directly interfaces with gate of external NMOS fuse-control FET. |
| Hysteresis | 250–400 mV; prevents oscillation during recovery by requiring cell voltage to drop to ≤4.05 V before reset. |
Pinout & Package
Package: 6-pin WSON (SON-6), 2.00 mm × 2.00 mm body size, with exposed thermal pad (PWRPAD) that must be connected to VSS on PCB.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| V1 | Sense input for lowest cell (Cell 1) | Connects to positive terminal of bottom cell; requires RC filter (RIN/CIN) for noise immunity and stable DC sensing. |
| V2 | Sense input for middle cell (Cell 2) | Connects to positive terminal of second cell; differential voltage V2–V1 equals Cell 2 voltage; shares same RIN/CIN design rules as V1. |
| VSS | Ground reference and lowest cell negative | Electrically common node for IC ground and battery pack negative; must be routed to PWRPAD for thermal and electrical integrity. |
| V3 | Sense input for top cell (Cell 3) | Connects to positive terminal of top cell in 3-series stacks; for 2-series use, V3 is shorted to V2 per datasheet guidance. |
| VDD | Unregulated power supply input | Accepts 3–25 V; requires series resistor and bypass capacitor (RVD/CVD) for ESD and ripple suppression per layout guidelines. |
| OUT | Active-high output driver | Drives gate of external N-channel FET to short fuse to ground during OVP; sinks current when low, sources current when high. |
Key Features
| Feature | Design Value |
|---|---|
| Independent cell monitoring | Three dedicated analog inputs (V1/V2/V3) enable true per-cell voltage validation-critical for detecting single-cell overvoltage in stacked configurations. |
| Factory-trimmed OVP accuracy | ±10 mV tolerance at 25°C ensures reliable secondary protection without field calibration or trimming components. |
| Thermal pad integration | PWRPAD must be soldered to VSS plane; reduces junction-to-board thermal resistance to 110.7°C/W, supporting continuous operation at 110°C ambient. |
| Customer Test Mode (CTM) | Enables 15 ms delay verification during production test via VDD–V3 ≥10 V, reducing final-pack test time without compromising safety validation. |
| Low-leakage analog inputs | <100 nA leakage per sense pin preserves cell voltage integrity and avoids false OVP trips caused by parasitic current paths. |
Applications
| Power Tools | Notebook Computers |
|---|---|
Use Scenario: Cordless drill battery packs subject to regenerative braking and fast charging transients. IC Role / Device Role / Timing Role: Secondary overvoltage protector that asserts OUT after 6.5 s if any cell exceeds 4.35 V, triggering fuse blow via external NMOS. Use Value: Prevents lithium plating and thermal runaway during charger malfunction or abnormal load conditions where primary protection may fail. |
Use Scenario: Slim-profile notebook battery modules with tight thermal constraints and multi-cell balancing requirements. IC Role / Device Role / Timing Role: Independent cell monitor verifying each of three series cells stays within 4.35 V ±10 mV, with hysteresis preventing chatter near threshold. Use Value: Enables compact, high-reliability secondary protection without adding discrete comparators or microcontroller firmware overhead. |
| Tablets | Portable Medical Instruments |
Use Scenario: Consumer tablet batteries operating across –20°C to +60°C ambient with frequent partial-charge cycles. IC Role / Device Role / Timing Role: Low-power (1 µA) OVP supervisor maintaining vigilance during standby; OUT activates only after sustained 6.5 s overvoltage event. Use Value: Extends shelf life and cycle count by eliminating unnecessary fuse activation from brief voltage spikes during hot-plug events. |
Use Scenario: Battery-powered handheld diagnostic devices requiring IEC 62368-1 compliance and redundant safety layers. IC Role / Device Role / Timing Role: Certified secondary protector validating cell voltage against 4.35 V threshold with documented ±10 mV accuracy and 250–400 mV hysteresis. Use Value: Meets functional safety requirements for medical battery systems by providing deterministic, hardware-based overvoltage response independent of host MCU. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar overvoltage protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BQ294502DRVT | Same 4.35 V OVP threshold but 4 s delay (vs. 6.5 s) | Better suited for applications requiring faster fault response, e.g., high-power drones with aggressive charge algorithms | Select BQ294502DRVT if system-level fault timing budget permits shorter delay; verify fuse blow energy matches reduced tDELAY. |
| BQ294506DRVT | Higher 4.38 V OVP threshold, same 4 s delay | Targeted at higher-voltage Li-ion chemistries (e.g., LiCoO₂ with extended upper voltage limit) | Choose BQ294506DRVT only if cell chemistry tolerates 4.38 V and design accepts tighter margin above standard 4.35 V spec. |
Compared with BQ294504DRVT, BQ294502DRVT offers faster response but less spike immunity, while BQ294506DRVT raises the protection ceiling-neither is pin-compatible drop-in replacements, and both require revalidation of fuse timing and cell voltage margins.
Availability
BQ294504DRVT is available at Aetrix Electronics and suitable for power tools, notebook computers, tablets, and portable medical instruments requiring stable component supply with guaranteed long-term manufacturability and automotive-grade temperature support.
Supply support for BQ294504DRVT 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 technologies, with leadership in battery management, power conversion, and precision analog ICs.
The BQ2945xx family is designed specifically for secondary overvoltage protection in multi-cell Li-ion battery packs, delivering factory-trimmed accuracy, ultra-low quiescent current, and robust thermal performance in space-constrained WSON packages.
FAQ
What is the exact overvoltage protection threshold and accuracy of the BQ294504DRVT?
The BQ294504DRVT has a factory-programmed overvoltage protection threshold of 4.35 V with ±10 mV accuracy at 25°C. This specification is guaranteed across temperature (–40°C to +110°C) with additional drift compensation up to ±54 mV at extremes, ensuring reliable secondary cutoff before cell damage occurs in the BQ294504DRVT-based protection circuit.
How does the BQ294504DRVT handle 2-cell versus 3-cell battery configurations?
The BQ294504DRVT supports both 2-series and 3-series Li-ion configurations. For 2-cell use, V3 is shorted to V2 per TI's application guidance; for 3-cell, V1, V2, and V3 connect to each cell's positive terminal. All configurations retain independent sensing, fixed 4.35 V threshold, and 6.5 s delay-no configuration pins or external programming are required for the BQ294504DRVT.
What is the role of the PWRPAD thermal pad on the BQ294504DRVT package?
The PWRPAD on the BQ294504DRVT must be electrically connected to the VSS net on the PCB. It serves dual functions: thermal dissipation (reducing θJB to 110.7°C/W) and electrical grounding for internal circuitry. Failure to connect PWRPAD to VSS violates the device's operational specification and may cause inaccurate voltage readings or functional failure in the BQ294504DRVT implementation.
Can the BQ294504DRVT be used without external RC filtering on its sense inputs?
No-the BQ294504DRVT requires external RC filters (RIN = 100–4700 Ω, CIN = 0.1–1 µF) on V1, V2, and V3 per Section 9.2.1. These components suppress high-frequency noise and prevent false OVP triggers. Omitting them compromises measurement stability and violates the validated design procedure defined for the BQ294504DRVT in TI's official documentation.
Does the BQ294504DRVT provide reverse polarity or overcurrent protection?
No-the BQ294504DRVT is exclusively an overvoltage monitor and protector. It does not detect reverse polarity, overcurrent, short circuit, or temperature faults. Those protections must be implemented separately using dedicated ICs or discrete solutions. The BQ294504DRVT's sole function is to assert OUT after 6.5 s when any sensed cell voltage reaches 4.35 V, making it a purpose-built secondary OVP device.
BQ294504DRVT 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)
BQ294504DRVT FAQ
1.How can I place an order for BQ294504DRVT through Aetrix?
Please submit a Request for Quotation (RFQ) for BQ294504DRVT 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 BQ294504DRVT reliable?
The price and inventory of BQ294504DRVT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BQ294504DRVT is usually 5 days.
3.What payment methods are accepted for BQ294504DRVT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BQ294504DRVT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BQ294504DRVT?
BQ294504DRVT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BQ294504DRVT 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 BQ294504DRVT?
For technical support, including BQ294504DRVT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BQ294504DRVT requirements.
6.How does Aetrix verify that BQ294504DRVT is sourced from the original manufacturer or authorized distributors?
All BQ294504DRVT 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 BQ294504DRVT meets industry standards.
7.What is the process for return or replacement of BQ294504DRVT?
All BQ294504DRVT units undergo pre-shipment inspection (PSI). If there is an issue with BQ294504DRVT, 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 BQ294504DRVT part is unused and in its original packaging.
Return procedure for BQ294504DRVT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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