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Texas Instruments BQ294502DRVT
- Part No.:
- BQ294502DRVT
- Manufacturer:
- Texas Instruments
- Category:
- Battery Management
- Package:
- 6-WDFN Exposed Pad
- Datasheet:
-
BQ294502DRVT.pdf
- Description:
- IC BATT PROT LI-ION 2-3CEL 6WSON
- Quantity:
- Payment:
- Shipping:
Inventory:750
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Product details
Overview
BQ294502DRVT 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, ±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 tablets.
For engineers reviewing the BQ294502DRVT datasheet, BQ294502DRVT pinout, BQ294502DRVT application, or BQ294502DRVT equivalent, key selection criteria include OVP accuracy (±10 mV), ultra-low quiescent current (1 µA), thermal pad grounding requirement, and compatibility with 2-/3-cell stack configurations requiring secondary-level safety redundancy.
Technical Context
The BQ294502DRVT implements independent analog sensing of V1–VSS, V2–V1, and V3–V2 differential voltages using an internal multiplexer, comparing each against a factory-programmed 4.35 V overvoltage threshold. Detection triggers a fixed 4 s delay timer before asserting the active-high OUT signal.
Its functional architecture includes integrated hysteresis (300 mV typ), low-leakage inputs (<100 nA per cell), and a dedicated PWRPAD thermal pad that must be electrically connected to VSS on PCB for stable operation. The device operates across –40°C to +110°C with supply voltage range 3 V to 25 V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| OVP Threshold | 4.35 V ±10 mV - precise, factory-trimmed trip point enabling reliable secondary protection without calibration. |
| OVP Delay Time | 4 s (fixed) - deterministic response window allowing time for system-level intervention before fuse activation. |
| Supply Current | ≈1 µA at VCELL < VPROTECT - enables multi-year battery pack shelf life without significant self-discharge impact. |
| Input Leakage | <100 nA per cell input - minimizes measurement error and avoids cell imbalance in high-impedance monitoring networks. |
| Operating Temp | –40°C to +110°C - supports industrial and power tool applications where ambient temperature extremes occur. |
| Output Drive | High-side open-drain capable of sourcing 4.5 mA - directly interfaces with gate of standard N-channel MOSFETs for fuse control. |
| Hysteresis | 300 mV typical - prevents output oscillation near threshold and ensures clean recovery after overvoltage clears. |
Pinout & Package
Package: WSON-6 (DRV), 2.00 mm × 2.00 mm body size with exposed thermal pad (PWRPAD) requiring connection to VSS on PCB.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| V1 | Sense input for lowest cell (Cell 1+) | Analog input referenced to VSS; requires RC filter for noise immunity in battery stack monitoring. |
| V2 | Sense input for middle cell (Cell 2+) | Analog input referenced to V1; used only in 3-cell configuration; shorted to V3 in 2-cell mode. |
| VSS | Ground reference and Cell 1– terminal | Power and signal ground; must be connected to PWRPAD for thermal and electrical stability. |
| V3 | Sense input for top cell (Cell 3+) | Analog input referenced to V2; unused in 2-cell stacks; tied to V2 per datasheet guidance. |
| VDD | Unregulated supply input | Accepts 3 V–25 V; requires series resistor and bypass capacitor for ESD and noise filtering. |
| OUT | Active-high output drive | Drives gate of external N-FET; pulls high during OVP after 4 s delay; resets low when all cells fall below (VOV – VHYS). |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 4.35 V OVP threshold | Eliminates external resistor programming, reducing BOM count and layout sensitivity in safety-critical battery packs. |
| 4 s fixed delay timer | Provides consistent fault response timing across temperature and voltage, simplifying system-level timing validation. |
| ±10 mV OVP accuracy | Ensures tight margin between primary and secondary protection thresholds, preventing premature or delayed shutdown. |
| 1 µA quiescent current | Extends battery pack shelf life and reduces standby power loss in always-connected portable equipment. |
| 6-pin WSON package | Enables compact placement adjacent to cell connections, minimizing trace inductance and improving noise immunity. |
Applications
| Power Tools | Notebook Computers |
|---|---|
Use Scenario: High-current discharge during motor startup causes transient cell voltage spikes exceeding safe limits. IC Role / Device Role / Timing Role: Secondary OVP monitor triggering fuse blow within 4 s if any cell exceeds 4.35 V, independent of primary protector. Use Value: Prevents thermal runaway by enforcing hard cutoff before lithium plating or electrolyte decomposition occurs. |
Use Scenario: Charger IC failure or firmware bug leads to overcharging of 3-cell Li-ion string beyond 12.9 V. IC Role / Device Role / Timing Role: Standalone hardware-based backup protection that asserts OUT after 4 s delay upon detecting ≥4.35 V on any cell. Use Value: Adds fail-safe layer compliant with IEC 62133 and UL 2054, eliminating reliance on software-only safeguards. |
| Tablets | Portable Medical Instruments |
Use Scenario: Rapid charging in compact enclosure causes localized heating and cell voltage drift during CC/CV transition. IC Role / Device Role / Timing Role: Independent per-cell voltage supervisor with 300 mV hysteresis ensuring stable re-enable after overvoltage clears. Use Value: Maintains protection integrity under thermal stress while avoiding nuisance trips during normal charge termination. |
Use Scenario: Battery pack used in life-critical handheld diagnostics must guarantee no unsafe overvoltage under single-point failure. IC Role / Device Role / Timing Role: Hardware-enforced secondary cutoff with guaranteed <10 ms test-mode verification for production line screening. Use Value: Enables ISO 13485-compliant manufacturing test without modifying functional circuitry or adding test pins. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar overvoltage protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BQ294504DRVT | Same 4.35 V OVP threshold but 6.5 s delay instead of 4 s | Better suited for systems requiring longer fault confirmation window before fuse activation | Select when slower response improves robustness against transient spikes without compromising safety margin |
| BQ294506DRVT | 4.38 V OVP threshold (30 mV higher), same 4 s delay | Allows tighter integration with primary charger ICs set to 4.35 V nominal termination | Choose when primary protection operates at 4.35 V and secondary must activate only on sustained overvoltage |
Compared with BQ294502DRVT, BQ294504DRVT extends fault confirmation time for improved noise immunity, while BQ294506DRVT raises the trip threshold to widen the guardband between primary and secondary protection layers-both retain identical pinout, package, and thermal design requirements.
Availability
BQ294502DRVT is available at Aetrix Electronics and suitable for power tools, notebook computers, tablets, and portable medical instruments requiring stable component supply with full lifecycle support and traceable sourcing.
Supply support for BQ294502DRVT 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 and power solutions.
The BQ2945 family is designed specifically for secondary overvoltage protection in multi-cell Li-ion battery packs, targeting applications where hardware-enforced redundancy is mandated by safety standards.
FAQ
What is the overvoltage protection threshold of the BQ294502DRVT?
The BQ294502DRVT has a factory-programmed overvoltage protection threshold of 4.35 V with ±10 mV accuracy across temperature. This fixed value eliminates external component dependencies and ensures consistent secondary protection behavior in 2- or 3-series Li-ion battery packs. The BQ294502DRVT does not support user adjustment of this threshold.
How does the BQ294502DRVT interface with the external MOSFET?
The BQ294502DRVT drives the gate of an external N-channel MOSFET via its active-high OUT pin. When an overvoltage condition persists for the full 4 s delay, OUT transitions high to turn on the FET, creating a path to ground for the fuse. The BQ294502DRVT output can source up to 4.5 mA and requires no external pull-up resistor due to its push-pull structure.
Is the thermal pad (PWRPAD) on the BQ294502DRVT required to be connected?
Yes, the PWRPAD on the BQ294502DRVT must be electrically connected to the VSS net on the PCB. This connection is mandatory for both thermal dissipation and proper internal biasing. Failure to connect PWRPAD may result in erratic OVP behavior, increased junction temperature, or functional failure-per TI's layout guidelines in the BQ294502DRVT datasheet.
Can the BQ294502DRVT be used in a 2-cell battery configuration?
Yes, the BQ294502DRVT supports both 2-series and 3-series Li-ion configurations. In 2-cell mode, the V3 pin is shorted to V2 per the datasheet. All protection logic remains fully functional, monitoring V1–VSS and V2–V1 differentials independently. The BQ294502DRVT requires no configuration change or external components to switch between 2- and 3-cell use.
What is the maximum operating temperature range for the BQ294502DRVT?
The BQ294502DRVT is specified to operate from –40°C to +110°C ambient temperature. This extended range supports demanding applications such as power tools and industrial portable equipment. Electrical characteristics-including OVP accuracy and delay timing-are guaranteed across this full range, with datasheet tables explicitly listing min/max values at –40°C and +110°C.
BQ294502DRVT 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)
BQ294502DRVT FAQ
1.How can I place an order for BQ294502DRVT through Aetrix?
Please submit a Request for Quotation (RFQ) for BQ294502DRVT 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 BQ294502DRVT reliable?
The price and inventory of BQ294502DRVT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BQ294502DRVT is usually 5 days.
3.What payment methods are accepted for BQ294502DRVT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BQ294502DRVT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BQ294502DRVT?
BQ294502DRVT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BQ294502DRVT 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 BQ294502DRVT?
For technical support, including BQ294502DRVT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BQ294502DRVT requirements.
6.How does Aetrix verify that BQ294502DRVT is sourced from the original manufacturer or authorized distributors?
All BQ294502DRVT 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 BQ294502DRVT meets industry standards.
7.What is the process for return or replacement of BQ294502DRVT?
All BQ294502DRVT units undergo pre-shipment inspection (PSI). If there is an issue with BQ294502DRVT, 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 BQ294502DRVT part is unused and in its original packaging.
Return procedure for BQ294502DRVT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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