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Texas Instruments BQ294602DRVT
- Part No.:
- BQ294602DRVT
- Manufacturer:
- Texas Instruments
- Category:
- Battery Management
- Package:
- 6-WDFN Exposed Pad
- Datasheet:
-
BQ294602DRVT.pdf
- Description:
- IC BATT PROT LI-ION 1CELL 6WSON
- Quantity:
- Payment:
- Shipping:
Inventory:2,975
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Product details
Overview
BQ294602DRVT from Texas Instruments is a single-cell secondary overvoltage protector IC for Li-ion battery packs, featuring a fixed 4.35 V overvoltage threshold, ±10 mV accuracy at 25°C, 4 s fault detection delay, 1 µA supply current (VCELL < VPROTECT), and 6-pin WSON package. It drives an external N-channel FET to enable fuse-blowing during overvoltage events in portable tablets and slates.
For engineers reviewing the BQ294602DRVT datasheet, BQ294602DRVT pinout, BQ294602DRVT application, or BQ294602DRVT equivalent, key selection criteria include OVP threshold tolerance, thermal stability across –40°C to +110°C, low leakage (<100 nA per cell input), output drive capability for NMOS gate control, and compatibility with compact PCB layouts requiring minimal RC filter components.
Technical Context
The BQ294602DRVT implements a dedicated analog comparator architecture that continuously monitors V1 against a factory-trimmed 4.35 V reference, triggering a fixed 4-second digital delay timer upon threshold exceedance. Its output transitions high only after delay expiration and resets low when V1 falls below (4.35 V – VHYS), where VHYS is 300 mV typical.
It operates from 3 V to 8 V on VDD, draws ≤2 µA over full temperature range, and features dual VSS pins for robust ground referencing. The internal power pad (PWRPAD) must be connected to PCB VSS for thermal and functional integrity, and no external programming interface is supported - all parameters are factory-configured.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| OVP Threshold | 4.35 V ±10 mV at 25°C; ensures precise secondary protection alignment with common Li-ion cell upper limits. |
| OVP Delay Time | 4 s fixed; provides deterministic response window before fuse activation, avoiding nuisance trips from transient spikes. |
| Supply Current | 1 µA typical (VCELL < VPROTECT); enables ultra-low quiescent power in always-on battery monitoring systems. |
| Input Leakage | <100 nA per cell input; minimizes self-discharge impact on protected battery during standby. |
| Operating Temp | –40°C to +110°C; supports operation in thermally demanding portable and industrial battery pack environments. |
| Hysteresis | 300 mV typical; prevents output oscillation near threshold by enforcing 4.05 V release point (4.35 V – 0.3 V). |
| Output Drive | VOUT = VDD – 0.3 V @ 100 µA sink; sufficient to fully enhance standard logic-level N-channel MOSFETs for fuse control. |
Pinout & Package
Package: 6-pin WSON (DRV), 2.0 mm × 2.0 mm body, 0.8 mm max height, exposed thermal pad (PWRPAD) electrically tied to VSS.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 NC | No connection | Unbonded pad; must remain floating - no PCB trace or copper pour allowed. |
| 2 V1 | Sense input | Positive terminal monitor for single Li-ion cell; requires RC filter (RIN/CIN) for noise immunity. |
| 3 VSS | Ground reference | Primary IC ground and battery negative return; connects to PWRPAD for thermal conduction. |
| 4 VSS | Ground reference | Secondary ground pin; must be externally shorted to Pin 3 and CELL– terminal on PCB. |
| 5 VDD | Power supply | Unregulated input (3–8 V); requires series resistor and bypass capacitor for ESD and ripple suppression. |
| 6 OUT | Output driver | Open-drain compatible output; sinks current to drive NMOS gate low or sources current to pull gate high via external pull-up. |
Key Features
| Feature | Design Value |
|---|---|
| Factory-programmed OVP | 4.35 V threshold with ±10 mV accuracy at 25°C and ±54 mV drift over –40°C to +110°C - eliminates external voltage reference or trimming. |
| Dual VSS pins | Provides low-impedance ground path and redundancy for reliable sensing and output switching in high-noise battery environments. |
| Thermal pad integration | PWRPAD ties directly to VSS and PCB ground plane, enabling 110.7°C/W junction-to-board thermal resistance for sustained operation at 110°C ambient. |
| Customer Test Mode (CTM) | Enables 15 ms delay verification during production test by applying VDD ≥ V1 + 10 V - reduces final-pack test time without compromising safety validation. |
| ESD robustness | ±2000 V HBM rating ensures survivability during board assembly and handling without additional protection circuitry. |
Applications
| Tablet Battery Pack Protection | Slate Power Management |
|---|---|
|
Use Scenario: Secondary overvoltage safeguard in slim-profile tablet battery packs where primary protection resides in the fuel gauge or charger IC. IC Role / Device Role / Timing Role: Standalone hardware-based OVP monitor that triggers fuse blow only after confirmed 4 s overvoltage condition, independent of system firmware. Use Value: Prevents thermal runaway during charger malfunction or cell imbalance by enforcing hard voltage cutoff with known timing margin. |
Use Scenario: Safety-critical backup protection in slate devices operating under variable ambient temperatures and high discharge rates. IC Role / Device Role / Timing Role: Voltage threshold detector with 300 mV hysteresis and –40°C to +110°C operational range, ensuring stable trip/release behavior across environmental extremes. Use Value: Maintains protection integrity without calibration drift, eliminating need for periodic recalibration or software intervention. |
| Portable Instrumentation Backup | Medical Handheld Device Safety |
|
Use Scenario: Redundant OVP layer in battery-powered portable test equipment requiring CE/IEC 62133 compliance. IC Role / Device Role / Timing Role: Hardware-enforced second-level protector that activates external NMOS switch to isolate cell from charging circuit upon overvoltage. Use Value: Delivers fail-safe behavior even if host MCU locks up or firmware fails - critical for certified portable instrumentation. |
Use Scenario: Life-support adjacent handheld medical devices where battery fault containment must meet ISO 13485 and IEC 60601-1 requirements. IC Role / Device Role / Timing Role: Dedicated analog OVP monitor with fixed 4 s delay and 1 µA quiescent current, minimizing standby drain while guaranteeing response predictability. Use Value: Enables extended shelf life and long-term reliability without compromising safety-critical shutdown timing or accuracy. |
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 |
|---|---|---|---|
| BQ294604DRVT | Same 4.35 V OVP threshold but 6.5 s fixed delay instead of 4 s; otherwise identical electrical specs and pinout. | Preferred where longer fault confirmation window is required to avoid false trips from charger transients or measurement noise. | Select BQ294604DRVT only if system-level validation confirms 6.5 s delay improves robustness without compromising safety response time. |
| MP26123DJ-LF-Z | Integrated single-cell protector with adjustable OVP (4.0–4.5 V), programmable delay (1–10 s), and built-in charge/discharge FET drivers - not pin-compatible. | Used in designs needing programmability and higher integration, but requires PCB redesign and firmware configuration. | Choose MP26123DJ-LF-Z only when flexibility in threshold/delay tuning justifies layout change and added complexity. |
Compared with BQ294602DRVT, BQ294604DRVT offers identical protection accuracy and thermal performance but extends fault confirmation time, while MP26123DJ-LF-Z trades fixed simplicity for configurability at the cost of pin compatibility and increased design effort.
Availability
BQ294602DRVT is available at Aetrix Electronics and suitable for tablet battery packs, slate power management systems, and portable instrumentation requiring stable component supply with guaranteed long-term manufacturability and RoHS-compliant packaging.
Supply support for BQ294602DRVT 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, embedded processing, and power management technologies, with leadership in battery management ICs for consumer and industrial markets.
The BQ2946xx product line is designed specifically for secondary-level hardware-based overvoltage protection in single-cell Li-ion battery packs, prioritizing accuracy, low power, and robustness over programmability or integration.
FAQ
What is the overvoltage protection threshold and accuracy of the BQ294602DRVT?
The BQ294602DRVT 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), the total accuracy drift is ±54 mV, as specified in the Electrical Characteristics table. This precision enables reliable secondary protection without external calibration, and the BQ294602DRVT maintains this specification across its lifetime under recommended operating conditions.
How does the BQ294602DRVT handle overvoltage hysteresis and release?
The BQ294602DRVT uses a fixed 300 mV hysteresis (VHYS) to prevent output oscillation near the trip point. When the cell voltage exceeds 4.35 V, the device waits 4 seconds and then drives OUT high. It releases OUT low only when V1 drops below 4.05 V (4.35 V – 0.3 V). This behavior is confirmed in Figure 7-1 and Section 7.3.1 of the datasheet, and the BQ294602DRVT implements this hysteresis entirely internally with no external components required.
Can the BQ294602DRVT be used without external RC filtering components?
No - the BQ294602DRVT requires external RC filters on both V1 and VDD pins per Figure 8-1 and Table 8-1. A 1 kΩ resistor and 0.1 µF capacitor are recommended for VDD (RVD/CVD), and a 1 kΩ resistor with 0.1 µF capacitor for V1 (RIN/CIN). These filters suppress high-frequency noise that could cause false OVP triggering, and omitting them violates the validated design guidance for the BQ294602DRVT.
What is the function of the NC pin (Pin 1) on the BQ294602DRVT?
Pin 1 of the BQ294602DRVT is a no-connect (NC) terminal - it is an unbonded pad with no internal connection. The datasheet explicitly states it must remain floating, with no PCB trace, copper pour, or solder mask opening. Connecting or routing to Pin 1 may compromise thermal performance or introduce parasitic coupling, and the BQ294602DRVT's functionality assumes this pin is left unconnected per TI's layout guidelines.
Does the BQ294602DRVT support customer programmability or configuration?
No - the BQ294602DRVT is a factory-programmed, fixed-function device with no serial interface, register map, or user-adjustable parameters. Its 4.35 V OVP threshold, 4 s delay, and hysteresis are laser-trimmed during manufacturing and cannot be modified. All configuration is done at the part-number level (e.g., BQ294604DRVT for 6.5 s delay), and the BQ294602DRVT operates autonomously without firmware or external control signals.
BQ294602DRVT 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)
BQ294602DRVT FAQ
1.How can I place an order for BQ294602DRVT through Aetrix?
Please submit a Request for Quotation (RFQ) for BQ294602DRVT 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 BQ294602DRVT reliable?
The price and inventory of BQ294602DRVT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BQ294602DRVT is usually 5 days.
3.What payment methods are accepted for BQ294602DRVT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BQ294602DRVT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BQ294602DRVT?
BQ294602DRVT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BQ294602DRVT 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 BQ294602DRVT?
For technical support, including BQ294602DRVT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BQ294602DRVT requirements.
6.How does Aetrix verify that BQ294602DRVT is sourced from the original manufacturer or authorized distributors?
All BQ294602DRVT 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 BQ294602DRVT meets industry standards.
7.What is the process for return or replacement of BQ294602DRVT?
All BQ294602DRVT units undergo pre-shipment inspection (PSI). If there is an issue with BQ294602DRVT, 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 BQ294602DRVT part is unused and in its original packaging.
Return procedure for BQ294602DRVT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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