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Texas Instruments BQ294533DRVT
- Part No.:
- BQ294533DRVT
- Manufacturer:
- Texas Instruments
- Category:
- Battery Management
- Package:
- 6-WDFN Exposed Pad
- Datasheet:
-
BQ294533DRVT.pdf
- Description:
- IC BATT PROT LI-ION 2-3CEL 6WSON
- Quantity:
- Payment:
- Shipping:
Inventory:750
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Product details
Overview
BQ294533DRVT from Texas Instruments is a secondary overvoltage protection IC for 3-series Li-ion battery packs, featuring fixed 4.5 V OVP threshold, 6.5 s fault delay, ±10 mV detection accuracy, and 1 µA quiescent current. 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 notebook computers.
For engineers reviewing the BQ294533DRVT datasheet, BQ294533DRVT pinout, BQ294533DRVT application, or BQ294533DRVT equivalent, key selection criteria include OVP threshold tolerance, delay timer consistency across temperature, low leakage per cell input (<100 nA), thermal pad grounding requirement, and compatibility with 2- or 3-cell stack configurations.
Technical Context
The BQ294533DRVT implements independent analog voltage sensing on V1, V2, and V3 inputs using internal multiplexer-based comparison against a factory-programmed 4.5 V reference. Its fixed 6.5 s delay timer activates only when any cell exceeds VOV, with hysteresis of 250–400 mV preventing chatter during recovery.
Operation requires VSS connection to the lowest cell's negative terminal and PWRPAD soldered to PCB ground. The OUT pin delivers active-high drive capable of sourcing ≥4.5 mA at VDD – 0.2 V, enabling direct gate control of external NMOS fuses without level-shifting circuitry.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| OVP Threshold | 4.5 V ±10 mV at 25°C; ensures precise secondary cutoff before cell degradation or thermal runaway |
| Delay Time | 6.5 s (typical), 5.2–7.8 s over –40°C to +110°C; provides robust fault confirmation window before action |
| Supply Current | 1 µA (typical) when all cells < VPROTECT; enables multi-year battery pack shelf life |
| Input Leakage | <100 nA per cell input; minimizes self-discharge impact on cell balancing and SOC accuracy |
| Operating Temp | –40°C to +110°C ambient; supports operation in high-temp environments like power tool battery packs |
| Hysteresis | 250–400 mV; prevents oscillation during slow voltage decay after overvoltage event |
| Output Drive | Sources ≥4.5 mA at VDD – 0.2 V; directly interfaces with standard logic-level NMOS FET gates |
Pinout & Package
Package: 6-pin WSON (DRV), 2.00 mm × 2.00 mm body size, with exposed thermal pad (PWRPAD) requiring PCB ground connection for proper operation and thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| V3 | Cell 3 positive sense input | Monitors top cell voltage in 3-series stack; must be connected via RC filter for noise immunity |
| V2 | Cell 2 positive sense input | Monitors middle cell voltage; tied to V3 in 2-series configuration |
| VSS | Ground reference and cell stack return | Electrically connects to negative terminal of lowest cell; also ties to PWRPAD |
| V1 | Cell 1 positive sense input | Monitors bottom cell voltage; forms differential pair with VSS for first cell measurement |
| VDD | Unregulated power supply input | Accepts 3–25 V; requires series resistor and bypass capacitor for ESD and noise suppression |
| OUT | Active-high overvoltage output driver | Drives NMOS gate to short fuse to ground; resets low when all cells fall below (VOV – VHYS) |
Key Features
| Feature | Design Value |
|---|---|
| Independent cell monitoring | Three separate analog inputs (V1/V2/V3) enable true per-cell overvoltage detection without shared reference errors |
| Factory-programmed OVP | Fixed 4.5 V threshold eliminates external resistor network, reducing BOM count and layout sensitivity |
| Thermal pad integration | PWRPAD must be soldered to PCB ground plane to ensure stable operation and meet thermal resistance spec (RθJB = 110.7°C/W) |
| Customer Test Mode (CTM) | Enables 15 ms delay verification during production test by applying VDD > V3 + 10 V, reducing test time vs full 6.5 s timeout |
| High-accuracy hysteresis | 250–400 mV programmable hysteresis prevents false triggering during transient voltage dips near threshold |
Applications
| Power Tools | Notebook Computers |
|---|---|
Use Scenario: Cordless drill battery packs subject to rapid charge termination and high-current discharge causing localized cell overvoltage. IC Role / Device Role / Timing Role: Secondary protector that triggers fuse blow only after confirmed 6.5 s overvoltage on any cell, backing up primary charger IC protection. Use Value: Prevents catastrophic cell venting by enforcing strict 4.5 V ceiling with ±10 mV accuracy across operating temperature range. | Use Scenario: Slim-profile laptop battery modules where space constraints limit thermal margin and require ultra-low quiescent current. IC Role / Device Role / Timing Role: Standby-mode OVP monitor drawing only 1 µA while continuously validating all three cell voltages. Use Value: Extends shelf life and reduces self-discharge-induced imbalance without compromising response time or accuracy. |
| Tablets | Portable Medical Instruments |
Use Scenario: Consumer tablet batteries exposed to variable ambient temperatures and fast-charging protocols increasing overvoltage risk. IC Role / Device Role / Timing Role: Independent per-cell voltage supervisor with 250–400 mV hysteresis to avoid nuisance trips during thermal drift. Use Value: Maintains reliable protection across –40°C to +110°C with no calibration required, supporting global deployment. | Use Scenario: Battery-powered handheld diagnostic devices requiring certified safety margins and traceable fault response. IC Role / Device Role / Timing Role: Certified secondary protection element with fixed 6.5 s delay and documented ±10 mV accuracy for regulatory submissions. Use Value: Enables IEC 62133 compliance through deterministic timing and metrology-grade voltage threshold stability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar overvoltage protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BQ294532DRVT | Same 4.5 V OVP threshold but 4 s delay instead of 6.5 s | Better suited for systems requiring faster fault response, e.g., high-power drones with aggressive charge algorithms | Select BQ294532DRVT when shorter delay is acceptable and tighter timing control is prioritized over margin for transient spikes |
| BQ294524DRVT | 4.45 V OVP threshold, 6.5 s delay, same package and pinout | Targets chemistries with lower safe voltage ceilings, such as LFP-influenced hybrid cells or aged NMC packs | Choose BQ294524DRVT when system-level validation confirms 4.45 V provides optimal balance between protection and usable capacity |
Compared with BQ294533DRVT, BQ294532DRVT offers faster reaction but less margin against brief overvoltage transients, while BQ294524DRVT lowers the trip point to accommodate voltage-sensitive cells-neither is pin-compatible without layout revision due to differing OVP thresholds affecting system-level calibration.
Availability
BQ294533DRVT is available at Aetrix Electronics and suitable for notebook computers, power tools, tablets, and portable medical instruments requiring stable component supply with guaranteed long-term availability and full traceability.
Supply support for BQ294533DRVT 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 delivering analog and embedded processing solutions for industrial, automotive, and personal electronics markets.
The BQ2945xy family is designed specifically for secondary overvoltage protection in multi-cell Li-ion battery packs, emphasizing accuracy, ultra-low power, and robustness in harsh thermal environments.
FAQ
What is the overvoltage protection threshold and accuracy of the BQ294533DRVT?
The BQ294533DRVT has a factory-programmed overvoltage protection threshold of 4.5 V with ±10 mV accuracy at 25°C. Over the full operating temperature range of –40°C to +110°C, the total error-including drift-is bounded by ±54 mV. This specification is verified per TI's production test flow and applies directly to the BQ294533DRVT without external calibration.
How does the BQ294533DRVT handle 2-cell versus 3-cell battery configurations?
The BQ294533DRVT supports both 2-series and 3-series Li-ion configurations. For 3-cell use, V1, V2, and V3 connect to each cell's positive terminal, with VSS at the stack's negative end. For 2-cell operation, V3 is shorted to V2 on the PCB, effectively disabling the third cell monitor while preserving full functionality for the remaining two cells-no firmware or configuration change is needed in the BQ294533DRVT itself.
What is the purpose and activation method of Customer Test Mode (CTM) in the BQ294533DRVT?
Customer Test Mode (CTM) in the BQ294533DRVT reduces production test time by shortening the overvoltage delay from 6.5 s to 15 ms. CTM activates when VDD exceeds V3 by at least 10 V-this differential is monitored internally and triggers the accelerated timer. The mode exits automatically when the differential falls below threshold. CTM is intended solely for factory testing and must not be used in end-equipment operation.
Does the BQ294533DRVT require external passive components, and if so, what are their critical values?
Yes, the BQ294533DRVT requires external RC filters: RIN (100–4700 Ω) and CIN (0.1–1 µF) on each Vx input for noise rejection, plus RVD (100–1 kΩ) and CVD (≥0.1 µF) on VDD. Deviation outside these ranges degrades measurement accuracy and may cause false trips. TI specifies these values in Section 9.2.1 of the BQ294533DRVT datasheet based on validated board-level performance.
What thermal considerations apply to the PWRPAD on the BQ294533DRVT package?
The PWRPAD on the BQ294533DRVT must be soldered to a PCB copper pour connected to VSS for both electrical and thermal integrity. TI specifies RθJB = 110.7°C/W when properly implemented; omitting this connection raises junction temperature significantly and risks exceeding absolute maximum ratings. Layout guidelines in Section 11.1 mandate minimum 2 mm² exposed pad area with ≥4 thermal vias to inner ground planes.
BQ294533DRVT 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)
BQ294533DRVT FAQ
1.How can I place an order for BQ294533DRVT through Aetrix?
Please submit a Request for Quotation (RFQ) for BQ294533DRVT 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 BQ294533DRVT reliable?
The price and inventory of BQ294533DRVT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BQ294533DRVT is usually 5 days.
3.What payment methods are accepted for BQ294533DRVT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BQ294533DRVT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BQ294533DRVT?
BQ294533DRVT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BQ294533DRVT 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 BQ294533DRVT?
For technical support, including BQ294533DRVT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BQ294533DRVT requirements.
6.How does Aetrix verify that BQ294533DRVT is sourced from the original manufacturer or authorized distributors?
All BQ294533DRVT 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 BQ294533DRVT meets industry standards.
7.What is the process for return or replacement of BQ294533DRVT?
All BQ294533DRVT units undergo pre-shipment inspection (PSI). If there is an issue with BQ294533DRVT, 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 BQ294533DRVT part is unused and in its original packaging.
Return procedure for BQ294533DRVT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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