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Texas Instruments BQ294604DRVT
- Part No.:
- BQ294604DRVT
- Manufacturer:
- Texas Instruments
- Category:
- Battery Management
- Package:
- 6-WDFN Exposed Pad
- Datasheet:
-
BQ294604DRVT.pdf
- Description:
- IC BATT PROT LI-ION 1CELL 6WSON
- Quantity:
- Payment:
- Shipping:
Inventory:750
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Product details
Overview
BQ294604DRVT from Texas Instruments is a single-cell lithium-ion battery secondary overvoltage protector IC that monitors cell voltage, triggers a fixed 6.5-second delay upon exceeding 4.35 V, and drives an external N-channel FET to blow a fuse-used in tablet and portable instrumentation battery packs.
For engineers reviewing the BQ294604DRVT datasheet, BQ294604DRVT pinout, BQ294604DRVT application, or BQ294604DRVT equivalent, this page delivers verified electrical specs (±10 mV OVP accuracy, 1 µA supply current), package mapping (6-pin WSON-DRV, 2.0 mm × 2.0 mm), functional mode behavior (NORMAL/OVERVOLTAGE/CTM), and real-world implementation constraints including thermal pad grounding and dual-VSS layout requirements.
Technical Context
The BQ294604DRVT implements a dedicated analog overvoltage comparator with factory-trimmed 4.35 V threshold and ±10 mV accuracy at 25°C, coupled to a fixed 6.5 s delay timer. It operates across –40°C to +110°C with hysteresis of 250–400 mV to prevent chatter during recovery.
Its output stage delivers 3 V high-level drive (VDD – 0.3 V) into 100 µA load and sinks ≤400 mV at 100 µA, enabling direct gate control of low-threshold NMOS FETs. Input leakage at V1 is <100 nA, ensuring minimal impact on cell voltage measurement integrity.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| OVP Threshold | 4.35 V ±10 mV at 25°C - precise secondary protection aligned with Li-ion charge termination voltage. |
| OVP Delay Time | 6.5 s (fixed) - allows transient overvoltage events to settle before triggering fuse blow. |
| Supply Current | 1 µA typical (VCELL < VPROTECT) - enables ultra-low-power always-on monitoring in battery-backed systems. |
| V1 Input Leakage | <100 nA - prevents significant voltage drop across external RC filter, preserving measurement accuracy. |
| Operating Temp | –40°C to +110°C - supports industrial and portable equipment operating in extended thermal environments. |
| Output Drive | VOH ≥ VDD – 0.3 V, VOL ≤ 400 mV - ensures reliable NMOS gate turn-on and clean low-state reset. |
| Hysteresis | 250–400 mV - guarantees stable re-arm after overvoltage clears without oscillation near threshold. |
Pinout & Package
Package: 6-pin WSON (DRV), 2.00 mm × 2.00 mm body, 0.8 mm max height, thermal power pad (PWRPAD) connected to VSS.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 NC | No connection | Unused pin; must remain unconnected per datasheet to avoid parasitic coupling. |
| 2 V1 | Sense input | Positive terminal monitor for single Li-ion cell; requires external RIN/CIN RC filter for noise immunity. |
| 3 VSS | Ground reference | IC ground and battery negative return; both VSS pins (3 & 4) must connect externally to CELL–. |
| 4 VSS | Ground reference | Second ground path for low-impedance return; mandatory parallel connection to CELL– for stability. |
| 5 VDD | Power supply | Unregulated input (3–8 V); requires series resistor and bypass capacitor for ESD/noise suppression. |
| 6 OUT | Output driver | Open-drain compatible output driving external NMOS gate; transitions high after 6.5 s OVP fault. |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 4.35 V OVP threshold | Factory-trimmed precision eliminates external resistor network and calibration overhead. |
| 6.5 s fault delay | Prevents nuisance tripping from brief voltage spikes while ensuring timely response to sustained overcharge. |
| Thermal pad (PWRPAD) | Must be soldered to PCB VSS plane to maintain junction temperature within 110°C limit under continuous operation. |
| Customer Test Mode (CTM) | Enables 15 ms delay verification during production test by applying VDD ≥ V1 + 10 V-reduces test time vs full 6.5 s wait. |
| Dual VSS pins | Provides low-inductance ground return paths essential for accurate high-impedance voltage sensing and noise rejection. |
Applications
| Tablet Battery Protection | Portable Instrumentation Pack |
|---|---|
Use Scenario: Secondary overvoltage safeguard in multi-cell Li-ion packs where primary protection resides in fuel gauge or charger IC. IC Role / Device Role / Timing Role: Standalone OV monitor that activates only when primary system fails, enforcing hard cutoff via fuse blow after 6.5 s. Use Value: Prevents thermal runaway by guaranteeing cell voltage never exceeds 4.35 V for more than 6.5 seconds-even if host MCU freezes or firmware corrupts. |
Use Scenario: Safety-critical backup protection in handheld test meters and medical devices requiring IEC 62133 compliance. IC Role / Device Role / Timing Role: Independent hardware-based fail-safe that operates without software intervention or clock source dependency. Use Value: Delivers certified second-level protection with ±10 mV OVP accuracy and guaranteed 6.5 s delay-meeting UL/IEC redundancy mandates. |
| Slates with Fast Charging | Industrial Portable Equipment |
Use Scenario: Mitigating overvoltage risk during USB PD or proprietary fast-charge protocols where voltage regulation may overshoot. IC Role / Device Role / Timing Role: Voltage comparator with fixed delay acting as final analog guardrail before charging terminates. Use Value: Enables aggressive fast-charge algorithms while maintaining strict 4.35 V ceiling-no firmware update needed to adjust protection level. |
Use Scenario: Ruggedized battery packs used in warehouse scanners, field data loggers, and outdoor sensors exposed to wide ambient temperatures. IC Role / Device Role / Timing Role: High-accuracy OV detector operating reliably from –40°C to +110°C with minimal drift (±54 mV over full range). Use Value: Ensures consistent protection performance across extreme environments where silicon-based thresholds would otherwise degrade. |
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 |
|---|---|---|---|
| BQ294602DRVT | Same 4.35 V OVP threshold but 4 s delay instead of 6.5 s; identical pinout, package, and leakage specs. | Suitable where faster fault response is required and transient tolerance is lower. | Select BQ294602DRVT only if system design validates 4 s delay suffices for safe fuse activation under worst-case current conditions. |
| BQ294624DRVT | Higher 4.45 V OVP threshold, same 6.5 s delay; all other electrical and mechanical specs match BQ294604DRVT. | Used when battery chemistry or charging profile permits higher cutoff voltage without compromising safety margin. | Choose BQ294624DRVT only if cell voltage excursion analysis confirms 4.45 V remains within safe operational window for the specific Li-ion variant. |
Compared with BQ294604DRVT, BQ294602DRVT offers faster response but reduced transient immunity, while BQ294624DRVT raises the protection ceiling-neither is pin-compatible replacement without verifying delay timing or OVP alignment with pack-level safety architecture.
Availability
BQ294604DRVT is available at Aetrix Electronics and suitable for tablet battery management, portable instrumentation power systems, and industrial handheld equipment requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for BQ294604DRVT 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, with leadership in power management, signal chain, and battery management ICs.
The BQ2946xx family was designed specifically for secondary-level overvoltage protection in single-cell Li-ion battery packs-providing autonomous, low-power, high-accuracy hardware safeguards independent of host system firmware.
FAQ
What is the exact overvoltage protection threshold and accuracy of the BQ294604DRVT?
The BQ294604DRVT has a factory-programmed overvoltage protection threshold of 4.35 V with ±10 mV accuracy at 25°C. Over the full operating temperature range (–40°C to +110°C), total accuracy drift is bounded at ±54 mV, ensuring robust protection across environmental extremes without calibration.
How does the BQ294604DRVT interact with the external MOSFET and fuse in a battery pack?
The BQ294604DRVT drives its OUT pin high after detecting overvoltage for 6.5 s, turning on an external N-channel MOSFET that shorts the fuse to ground. This creates a low-impedance path allowing battery or charger current to blow the fuse-physically disconnecting the cell from the circuit as a permanent safety measure.
Why does the BQ294604DRVT have two VSS pins and what is the correct PCB layout practice?
The BQ294604DRVT uses two VSS pins (pins 3 and 4) to provide separate low-inductance ground returns for analog sensing (V1) and power (VDD/OUT). Both must be connected externally to the CELL– terminal using short, wide traces-and the thermal pad (PWRPAD) must also be soldered to the same VSS plane for thermal and electrical stability.
Can the BQ294604DRVT be used without external RC filtering on V1 and VDD?
No. The BQ294604DRVT requires external RC filters: RIN = 1 kΩ ±10% and CIN = 0.1 µF on V1, plus RVD = 1 kΩ and CVD = 0.1 µF on VDD. These components suppress noise and transients that could cause false OVP triggering or damage-omitting them violates the validated design per TI's application schematic and reliability testing.
What is Customer Test Mode (CTM) and how is it activated on the BQ294604DRVT?
Customer Test Mode (CTM) reduces production test time by shortening the OVP delay to >10 ms. It is activated by applying VDD ≥ V1 + 10 V-verified in-system without modifying hardware. CTM exits automatically when the differential drops below 10 V, and absolute maximum ratings must never be exceeded during activation.
BQ294604DRVT 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)
BQ294604DRVT FAQ
1.How can I place an order for BQ294604DRVT through Aetrix?
Please submit a Request for Quotation (RFQ) for BQ294604DRVT 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 BQ294604DRVT reliable?
The price and inventory of BQ294604DRVT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BQ294604DRVT is usually 5 days.
3.What payment methods are accepted for BQ294604DRVT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BQ294604DRVT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BQ294604DRVT?
BQ294604DRVT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BQ294604DRVT 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 BQ294604DRVT?
For technical support, including BQ294604DRVT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BQ294604DRVT requirements.
6.How does Aetrix verify that BQ294604DRVT is sourced from the original manufacturer or authorized distributors?
All BQ294604DRVT 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 BQ294604DRVT meets industry standards.
7.What is the process for return or replacement of BQ294604DRVT?
All BQ294604DRVT units undergo pre-shipment inspection (PSI). If there is an issue with BQ294604DRVT, 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 BQ294604DRVT part is unused and in its original packaging.
Return procedure for BQ294604DRVT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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