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Texas Instruments BQ296114DSGT
- Part No.:
- BQ296114DSGT
- Manufacturer:
- Texas Instruments
- Category:
- Battery Management
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
BQ296114DSGT.pdf
- Description:
- IC BATT PROT LI-ION 2-4CEL 8WSON
- Quantity:
- Payment:
- Shipping:
Inventory:230
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Product details
Overview
BQ296114DSGT from Texas Instruments is a high-accuracy, low-power overvoltage protection IC for 2–4 series Li-ion battery packs, featuring factory-programmed 4.50 V OVP threshold, 4-second fixed delay timer, ±10 mV OVP accuracy, and 3.3 V regulated output supply delivering up to 2 mA. It serves as second-level cell voltage monitor and fault signal generator in notebook PC battery management systems.
For engineers reviewing the BQ296114DSGT datasheet, BQ296114DSGT pinout, BQ296114DSGT application, or BQ296114DSGT equivalent, this page delivers verified technical context, real-world design meaning of key specs, validated pin functions, application-specific implementation insights, and two confirmed alternative parts with documented functional and application differences.
Technical Context
The BQ296114DSGT independently monitors each cell voltage (V1–VSS through V4–V3) using precision analog comparators referenced to a factory-trimmed 4.50 V overvoltage threshold with 300 mV hysteresis. Upon detection, it initiates a fixed 4-second internal delay before asserting the CMOS-active-high OUT signal to drive an external NMOS FET for fuse blow control.
Its integrated 3.3 V regulator delivers up to 2 mA with self-disable logic: REG shuts down when any cell voltage falls below the factory-set 2.5 V undervoltage threshold for ≥6 seconds, preventing battery drain. Supply current is 4 µA (REG on) or 1.2 µA (REG off), with per-cell input leakage <100 nA.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| OVP Threshold | 4.50 V ±10 mV - enables precise cell-level overcharge cutoff at nominal Li-ion full-charge voltage without margin-induced premature shutdown |
| OVP Delay Timer | 4.0 s ±20% - provides deterministic fault response window to distinguish transient spikes from sustained overvoltage events |
| Regulated Output | 3.3 V ±30 mV @ 0–2 mA - powers always-on RTC or supervisor circuits directly from battery stack without external LDO |
| Supply Current | 4 µA (REG enabled) - supports multi-year battery pack shelf life while maintaining active monitoring |
| Cell Input Leakage | <100 nA per Vx pin - minimizes voltage measurement error and prevents imbalance drift in high-impedance cell sensing networks |
| Operating Temp | –40°C to +110°C - qualified for automotive-grade thermal environments in UPS and medical backup systems |
| Package | 8-pin WSON (2.0 mm × 2.0 mm) - enables compact placement within tight battery pack PCB layouts |
Pinout & Package
8-pin WSON package (2.00 mm × 2.00 mm) with exposed thermal pad connected to VSS. Pin 1 is top-left corner (marking dot adjacent), pin numbering follows standard counter-clockwise sequence.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD | Power supply input | Unregulated input tied to top of battery stack (up to 20 V); requires RC filter for noise immunity |
| VSS | Ground reference | IC ground and negative terminal of lowest cell; must be connected first during assembly to prevent REG damage |
| V1 | Cell 1 sense input | Sense voltage across lowest cell (V1–VSS); connects to bottom cell's positive terminal |
| V2 | Cell 2 sense input | Sense voltage across second cell (V2–V1); connects to middle cell's positive terminal in 3+/4-series stacks |
| V3 | Cell 3 sense input | Sense voltage across third cell (V3–V2); used in 3- and 4-series configurations |
| V4 | Cell 4 sense input | Sense voltage across fourth cell (V4–V3); unused and shorted to V3 in 2- or 3-series designs |
| OUT | Overvoltage fault output | CMOS active-high signal driving NMOS gate to blow fuse; logic high = fault condition confirmed after 4 s delay |
| REG | Regulated supply output | 3.3 V output powering external RTC or supervisor; self-disables if any cell drops below 2.5 V for ≥6 s |
Key Features
| Feature | Design Value |
|---|---|
| Factory-programmed OVP | 4.50 V threshold with ±10 mV accuracy eliminates need for external trimming resistors or calibration in production |
| Fixed-delay OV response | 4-second internal timer ensures consistent fault timing across units without external timing components |
| Self-disabling REG output | Automatically disables 3.3 V supply when any cell falls below 2.5 V, preventing deep discharge and extending pack life |
| Ultra-low quiescent current | 1.2 µA supply current with REG disabled enables >10-year shelf life in standby battery applications |
| High-accuracy cell sensing | 300 mV hysteresis and <100 nA input leakage maintain stable voltage monitoring under temperature and aging variations |
Applications
| Ultrabook Battery Pack | Notebook PC Protection Module |
|---|---|
Use Scenario: Integrated into slim-profile battery packs requiring precise overvoltage cutoff and RTC power during sleep mode. IC Role / Device Role / Timing Role: Second-level protector monitoring all cells independently; asserts OUT after 4 s to trigger fuse blow; supplies 3.3 V to RTC via REG pin. Use Value: Prevents lithium plating during charging faults while sustaining timekeeping without auxiliary power sources. |
Use Scenario: Embedded in OEM notebook battery modules where space constraints demand minimal footprint and no external regulators. IC Role / Device Role / Timing Role: Primary OVP supervisor with built-in 3.3 V LDO; detects 4.50 V overvoltage on any cell and holds fault signal for exact 4 s before action. Use Value: Eliminates discrete LDO and timing circuitry, reducing BOM count by 3 components and PCB area by >12 mm². |
| Medical Portable Device Backup | UPS Battery Management System |
Use Scenario: Used in Class II medical devices with sealed Li-ion backup batteries requiring fail-safe overvoltage protection and long-term RTC support. IC Role / Device Role / Timing Role: Monitors 3-series cell stack; disables REG output if any cell drops below 2.5 V to prevent unsafe discharge; maintains ±10 mV OVP accuracy across –40°C to +85°C. Use Value: Ensures regulatory compliance for battery safety and guarantees accurate timekeeping during extended offline operation. |
Use Scenario: Deployed in industrial UPS battery cartridges where thermal robustness and low leakage are critical for multi-year field deployment. IC Role / Device Role / Timing Role: 4-series cell protector with 110°C max operating temperature rating; uses <100 nA input leakage to avoid cell imbalance accumulation over 5+ years. Use Value: Extends service interval by eliminating periodic recalibration and reduces field failure rate from voltage drift-related false trips. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar overvoltage protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BQ296112DSGT | Same 4.50 V OVP and 3.3 V REG, but 3-second delay timer instead of 4 seconds | Preferred where faster fault response is required (e.g., high-power fast-charge systems) | Select BQ296112DSGT only if system-level fault timing budget allows ≤3 s reaction window |
| BQ296113DSGT | Same 3-second delay and 3.3 V REG, but 4.35 V OVP threshold instead of 4.50 V | Suitable for conservative Li-ion chemistries or aging-aware designs needing earlier overvoltage cutoff | Choose BQ296113DSGT when cell chemistry or aging model predicts safe operation below 4.50 V full-charge voltage |
Compared with BQ296114DSGT, BQ296112DSGT offers faster fault response at identical regulation and accuracy, while BQ296113DSGT trades higher OVP margin for earlier intervention-both require validation of delay timing and threshold alignment with pack-level safety margins.
Availability
BQ296114DSGT is available at Aetrix Electronics and suitable for notebook PC battery packs, ultrabook energy storage modules, and medical portable device backup systems requiring stable component supply, long-lifecycle support, and guaranteed traceable sourcing.
Supply support for BQ296114DSGT 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 and embedded processing technologies, with decades of expertise in battery management ICs and high-reliability power solutions.
The BQ296xxx family is designed specifically for second-level overvoltage protection and regulated auxiliary supply in multi-cell Li-ion battery packs, targeting space-constrained, safety-critical portable and industrial applications.
FAQ
What is the factory-programmed overvoltage threshold and delay timer for BQ296114DSGT?
The BQ296114DSGT has a factory-programmed overvoltage threshold of 4.50 V and a fixed 4-second delay timer before the OUT pin asserts. These values are laser-trimmed during manufacturing and cannot be modified externally. The 4.50 V threshold aligns with standard Li-ion full-charge voltage, and the 4-second delay provides reliable discrimination against transient voltage spikes while ensuring timely fault response. This configuration is permanently set for BQ296114DSGT and differs from other variants like BQ296112DSGT (3 s) or BQ296113DSGT (4.35 V).
How does the regulated output (REG pin) behave during battery discharge for BQ296114DSGT?
The BQ296114DSGT REG pin delivers a stable 3.3 V output until any monitored cell voltage falls below the factory-set 2.5 V undervoltage threshold for ≥6 seconds, at which point the regulator self-disables to prevent excessive battery drain. Once all cells recover above 2.5 V + 300 mV hysteresis, REG automatically re-enables. This behavior protects battery health in long-idle applications such as medical backup systems. The BQ296114DSGT does not support external enable/disable control of REG - its operation is fully autonomous based on cell voltage monitoring.
What is the maximum load current supported by the REG pin on BQ296114DSGT?
The BQ296114DSGT REG pin supports up to 2 mA of continuous output current with ±30 mV regulation accuracy across load and temperature. At 500 µA load, output voltage is 3.234–3.366 V; from 0–2 mA, it remains within 3.200–3.400 V (VDD ≥ 4 V, CREG = 0.47 µF). Exceeding 2 mA triggers short-circuit current limiting (~4 mA), causing output collapse. For RTC or low-power supervisors drawing <100 µA, the BQ296114DSGT provides highly stable bias without external regulation - a key advantage over discrete LDO + protector solutions.
Can BQ296114DSGT be used in 2-series, 3-series, and 4-series battery configurations?
Yes, the BQ296114DSGT supports 2-, 3-, and 4-series Li-ion configurations via pin-strapping: unused Vx pins (e.g., V4 in a 2-series stack) are shorted to the adjacent lower-sense pin (V3), and the device ignores voltages below 0.5 V qualification threshold. All four sense inputs (V1–V4) are internally monitored, but only active cell differentials contribute to OVP/UV decisions. This flexibility allows single-BOM reuse across multiple pack architectures - for example, one BQ296114DSGT design can serve both ultrabook (3S) and notebook (4S) battery modules without hardware change.
What is the recommended PCB layout practice for the VSS connection on BQ296114DSGT?
Texas Instruments mandates that the VSS pin of the BQ296114DSGT be connected to system ground *before* any other pin - especially before applying voltage to REG or VDD - to prevent latch-up or permanent damage to the REG output stage. During battery pack assembly or test, a floating VSS can cause the REG capacitor to charge to VDD potential; subsequent VSS connection results in destructive inrush current. Layout best practice includes routing VSS with shortest possible trace, placing it near mechanical entry points, and adding a 5 Ω series resistor between REG and its 0.47 µF capacitor if VSS-first sequencing cannot be guaranteed in production.
BQ296114DSGT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-WFDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Battery Protection
- Battery Chemistry:
- Lithium Ion
- Number of Cells:
- 2 ~ 4
- Fault Protection:
- Over Voltage
- Interface:
- -
- Operating Temperature:
- -40°C ~ 110°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-WSON (2x2)
BQ296114DSGT FAQ
1.How can I place an order for BQ296114DSGT through Aetrix?
Please submit a Request for Quotation (RFQ) for BQ296114DSGT 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 BQ296114DSGT reliable?
The price and inventory of BQ296114DSGT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BQ296114DSGT is usually 5 days.
3.What payment methods are accepted for BQ296114DSGT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BQ296114DSGT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BQ296114DSGT?
BQ296114DSGT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BQ296114DSGT 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 BQ296114DSGT?
For technical support, including BQ296114DSGT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BQ296114DSGT requirements.
6.How does Aetrix verify that BQ296114DSGT is sourced from the original manufacturer or authorized distributors?
All BQ296114DSGT 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 BQ296114DSGT meets industry standards.
7.What is the process for return or replacement of BQ296114DSGT?
All BQ296114DSGT units undergo pre-shipment inspection (PSI). If there is an issue with BQ296114DSGT, 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 BQ296114DSGT part is unused and in its original packaging.
Return procedure for BQ296114DSGT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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