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Texas Instruments BQ294532DRVT
- Part No.:
- BQ294532DRVT
- Manufacturer:
- Texas Instruments
- Category:
- Battery Management
- Package:
- 6-WDFN Exposed Pad
- Datasheet:
-
BQ294532DRVT.pdf
- Description:
- IC BATT PROT LI-ION 2-3CEL 6WSON
- Quantity:
- Payment:
- Shipping:
Inventory:1,150
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Product details
Overview
BQ294532DRVT from Texas Instruments is a secondary overvoltage protection IC for 2- or 3-series Li-ion battery packs, featuring a fixed 4.5 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 notebook computers.
For engineers reviewing the BQ294532DRVT datasheet, BQ294532DRVT pinout, BQ294532DRVT application, or BQ294532DRVT equivalent, this page delivers verified specifications, functional context, package layout, real-world use cases, and validated alternative options - all grounded in TI's production-grade documentation for BQ294532DRVT.
Technical Context
The BQ294532DRVT implements independent analog sensing of three cell voltages (V1–VSS, V2–V1, V3–V2) via internal multiplexer and comparator circuitry, with factory-programmed 4.5 V overvoltage threshold and fixed 4 s delay timer. Its output transitions high only after sustained overvoltage exceeds threshold for full delay duration, then resets low when all cells fall below (4.5 V – 300 mV hysteresis).
It operates across –40°C to +110°C ambient, draws ≈1 µA supply current under normal conditions, and supports both 2-cell (V3 shorted to V2) and 3-cell configurations. The PWRPAD thermal pad must be connected to VSS on PCB for stable operation and thermal performance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| OVP Threshold | 4.5 V ±10 mV - factory-trimmed precision threshold enabling reliable secondary overvoltage cutoff at nominal Li-ion full-charge voltage. |
| Delay Time | 4 s (typical), 3.2–4.8 s (min–max) - fixed internal timer preventing false triggers from transient spikes while ensuring timely protection response. |
| Supply Current | ≈1 µA at VDD < 15 V and all cells below OVP - ultra-low quiescent draw preserving battery standby life in always-connected packs. |
| Input Leakage | < 100 nA per cell input - minimizes measurement error and self-discharge impact on individual cell balancing. |
| Operating Temp | –40°C to +110°C - qualified for harsh environments including power tool battery packs and industrial portable equipment. |
| Hysteresis | 250–400 mV - prevents oscillation near trip point by requiring cell voltage to drop significantly below 4.5 V before reset. |
| Output Drive | High-level output ≥6 V at VDD = 7.2 V, IOH = 100 µA - sufficient gate drive to reliably turn on standard N-channel protection FETs. |
Pinout & Package
Package: 6-pin WSON (DRV), 2.00 mm × 2.00 mm body size, exposed thermal pad (PWRPAD) electrically tied to VSS.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| V1 | Sense input for lowest cell (Cell 1) | Analog input referenced to VSS; connects directly across Cell 1 terminals for independent voltage monitoring. |
| V2 | Sense input for middle cell (Cell 2) | Analog input referenced to V1; measures differential voltage between Cell 2 and Cell 1 in 3-cell stacks. |
| VSS | Ground reference and lowest cell negative | IC ground and physical connection point to battery pack negative terminal; must connect to PWRPAD on PCB. |
| V3 | Sense input for top cell (Cell 3) | Analog input referenced to V2; used only in 3-cell configuration; left floating or tied to V2 in 2-cell mode. |
| VDD | Unregulated power supply input | Accepts 3–25 V; powers internal circuitry; requires RC filter (RVD/CVD) for noise immunity and current limiting. |
| OUT | Active-high overvoltage output driver | Drives gate of external N-channel FET; pulls high to enable fuse-blow path when overvoltage condition persists for full delay. |
Key Features
| Feature | Design Value |
|---|---|
| Independent cell monitoring | Three dedicated 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 networks or trimming, reducing BOM count and calibration overhead. |
| Low-power protection state | 1 µA typical ICC ensures <1 µA parasitic drain on battery during long-term storage or standby. |
| Thermal pad integration | PWRPAD tied to VSS provides mechanical stability and enhanced thermal dissipation for continuous operation at 110°C ambient. |
| Customer Test Mode (CTM) | 15 ms test-mode delay enables rapid production validation of OVP timing without waiting 4 seconds per unit. |
Applications
| Power Tools | Notebook Computers |
|---|---|
Use Scenario: Cordless drill battery packs subject to fast-charging and high-current discharge cycles. IC Role / Device Role / Timing Role: Secondary overvoltage protector that triggers fuse blow if charger overvoltage or cell imbalance causes any cell to exceed 4.5 V for ≥4 s. Use Value: Prevents thermal runaway by cutting power before lithium plating initiates, meeting UL 2054 and IEC 62133 safety requirements. |
Use Scenario: Slim-profile laptop battery modules where space limits discrete protection components. IC Role / Device Role / Timing Role: Standalone OVP monitor placed between battery cells and protection MOSFET gate driver. Use Value: Enables compact 3S design with 2.0 mm × 2.0 mm footprint and no external timing components, reducing PCB area by >30% vs discrete solutions. |
| Tablets | Portable Medical Instruments |
Use Scenario: High-density tablet battery packs operating near thermal limits during video playback or charging. IC Role / Device Role / Timing Role: Independent cell voltage supervisor verifying safe charge termination before main BMS enters sleep mode. Use Value: ±10 mV OVP accuracy ensures consistent 4.5 V cutoff across temperature, eliminating premature shutdown or unsafe overcharge. |
Use Scenario: Battery-powered ECG or infusion pump devices requiring fail-safe shutdown under fault conditions. IC Role / Device Role / Timing Role: Hardwired secondary protection layer that remains active even if primary microcontroller fails or locks up. Use Value: Meets ISO 13485 and IEC 62304 Class C software safety requirements by providing hardware-enforced overvoltage cutoff independent of firmware. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar overvoltage protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BQ294522DRVT | 4.45 V OVP threshold, same 4 s delay, identical pinout and package | Used where tighter 4.45 V cutoff is required to accommodate aging cells or lower-voltage chemistry variants | Select when system requires earlier overvoltage intervention than 4.5 V allows, without changing layout or firmware. |
| BQ294533DRVT | Same 4.5 V OVP threshold but 6.5 s delay (vs 4 s), otherwise identical electrical and mechanical specs | Preferred in applications with known benign transients (e.g., load-dump events) where longer delay avoids nuisance trips | Choose when field data shows occasional <4 s overvoltage spikes that should not trigger protection; no PCB change needed. |
Compared with BQ294522DRVT and BQ294533DRVT, the BQ294532DRVT offers the highest OVP threshold (4.5 V) among 4 s-delay variants, making it optimal for new Li-ion designs targeting maximum energy density without compromising safety margin.
Availability
BQ294532DRVT is available at Aetrix Electronics and suitable for notebook computers, power tools, and portable medical instrumentation requiring stable component supply, long-lifecycle support, and guaranteed traceability for safety-critical battery systems.
Supply support for BQ294532DRVT 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.
The BQ2945xy family was designed specifically for secondary overvoltage protection in multi-cell Li-ion battery packs, delivering factory-trimmed accuracy, ultra-low power, and robust thermal performance in miniature WSON packages.
FAQ
What is the exact overvoltage protection threshold of the BQ294532DRVT?
The BQ294532DRVT has a factory-programmed overvoltage protection threshold of 4.5 V, with a tolerance of ±10 mV at 25°C. This value is fixed and non-adjustable, and its drift over temperature is bounded within ±54 mV across –40°C to +110°C, as specified in TI's SLUSAJ3K datasheet revision K.
Does the BQ294532DRVT support both 2-cell and 3-cell Li-ion battery configurations?
Yes, the BQ294532DRVT supports both configurations: for 2-cell stacks, V3 is shorted to V2; for 3-cell stacks, V1, V2, and V3 are connected across each cell's positive terminals with VSS at the stack's negative end. All configurations use the same BQ294532DRVT device without modification.
How does the BQ294532DRVT reset after triggering overvoltage protection?
The BQ294532DRVT resets its OUT pin to low when all monitored cell voltages fall below (4.5 V – hysteresis), where hysteresis is 250–400 mV. This ensures stable recovery without oscillation, and the device automatically returns to NORMAL mode without requiring power cycle or external signal.
What is the purpose of the PWRPAD on the BQ294532DRVT package?
The PWRPAD on the BQ294532DRVT is an exposed thermal pad that must be soldered to a VSS-connected copper area on the PCB. It serves dual roles: improving thermal dissipation (RθJB = 110.7°C/W) and providing mechanical stability - TI explicitly states operation is invalid if PWRPAD is not connected to VSS.
Can the BQ294532DRVT be used without external RC filtering components?
No - external RC filters are mandatory. Each Vx input requires series RIN (100–4700 Ω) and shunt CIN (0.1–1 µF); VDD requires RVD/CVD. These components suppress noise and ensure stable voltage monitoring; omitting them risks false triggering or missed faults, as confirmed in Section 9.2.1 of the BQ294532DRVT datasheet.
BQ294532DRVT 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)
BQ294532DRVT FAQ
1.How can I place an order for BQ294532DRVT through Aetrix?
Please submit a Request for Quotation (RFQ) for BQ294532DRVT 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 BQ294532DRVT reliable?
The price and inventory of BQ294532DRVT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BQ294532DRVT is usually 5 days.
3.What payment methods are accepted for BQ294532DRVT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BQ294532DRVT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BQ294532DRVT?
BQ294532DRVT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BQ294532DRVT 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 BQ294532DRVT?
For technical support, including BQ294532DRVT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BQ294532DRVT requirements.
6.How does Aetrix verify that BQ294532DRVT is sourced from the original manufacturer or authorized distributors?
All BQ294532DRVT 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 BQ294532DRVT meets industry standards.
7.What is the process for return or replacement of BQ294532DRVT?
All BQ294532DRVT units undergo pre-shipment inspection (PSI). If there is an issue with BQ294532DRVT, 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 BQ294532DRVT part is unused and in its original packaging.
Return procedure for BQ294532DRVT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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