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Texas Instruments BQ296228DSGT
- Part No.:
- BQ296228DSGT
- Manufacturer:
- Texas Instruments
- Category:
- Battery Management
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
BQ296228DSGT.pdf
- Description:
- IC BATT PROT LI-ION 2-4CEL 8WSON
- Quantity:
- Payment:
- Shipping:
Inventory:250
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Product details
Overview
BQ296228DSGT from Texas Instruments is a high-accuracy, low-power overvoltage protector IC for 2–4 series Li-ion battery packs, featuring factory-programmed 4.55V OVP threshold, 6.5s fixed delay timer, ±10mV OVP accuracy, 3.0V regulated output (2mA max), and 8-pin WSON (2mm × 2mm) package. It monitors each cell independently and drives external FETs to blow fuses during overvoltage faults in notebook PC battery packs.
For engineers reviewing the BQ296228DSGT datasheet, BQ296228DSGT pinout, BQ296228DSGT application, or BQ296228DSGT equivalent, this page delivers verified technical context, real-world timing behavior, regulator self-disable logic, and precise parameter mapping - all confirmed against TI's SLUSBU5V production datasheet (Rev. SEPTEMBER 2025).
Technical Context
The BQ296228DSGT implements independent per-cell voltage monitoring using precision analog comparators referenced to a factory-trimmed 4.55V overvoltage threshold with 300mV hysteresis. Upon detection of any cell exceeding VOV, a fixed 6.5s internal timer initiates before asserting the active-high OUT signal to trigger external protection FETs.
Its integrated 3.0V regulated supply delivers up to 2mA with self-disable functionality: REG shuts down when any cell voltage drops below the factory-set 2.5V undervoltage threshold for ≥6s, preventing battery drain. The device draws only 4µA (REG on) or 1.2µA (REG off) under normal operation, with <100nA per-cell input leakage.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| OVP Threshold | 4.55V ±10mV at 25°C; ensures precise cell-level shutdown before thermal runaway risk in 4S Li-ion stacks |
| OVP Delay Timer | 6.5s fixed (±20%); provides deterministic fault response window for fuse-blowing circuitry |
| Regulated Output | 3.0V ±30mV @ 0–2mA; powers RTC or microcontroller sleep circuits without external LDO |
| Supply Current | 4µA (REG enabled), 1.2µA (REG disabled); enables multi-year battery pack shelf life |
| Cell Input Leakage | <100nA per Vx pin; minimizes parasitic discharge across stacked cells during storage |
| Operating Temp | –40°C to +110°C; supports automotive cabin and industrial UPS environments |
| Package | 8-pin WSON (2.0mm × 2.0mm, 0.5mm pitch); enables compact placement adjacent to battery cells |
Pinout & Package
8-pin WSON package (2.00mm × 2.00mm, 0.5mm pitch) with exposed thermal pad connected to VSS. Pin 1 marked by dot; top-view orientation matches Figure 5-2 in SLUSBU5V.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD | Power supply input | Unregulated input (3–20V); connects to top of battery stack; requires RC filter for noise immunity |
| VSS | Ground reference | IC ground and negative terminal of lowest cell; must be connected first during assembly to avoid REG damage |
| V1 | Cell 1 sense input | Sense positive terminal of bottom cell (V1–VSS); requires 1kΩ/0.1µF RC filter |
| V2 | Cell 2 sense input | Sense positive terminal of second cell (V2–V1); same filtering as V1 |
| V3 | Cell 3 sense input | Sense positive terminal of third cell (V3–V2); unused pins shorted to adjacent Vx |
| V4 | Cell 4 sense input | Sense positive terminal of top cell (V4–V3); supports 4S configuration |
| OUT | Overvoltage fault output | Active-high CMOS driver (7V capable); sinks ≥4.5mA to turn on NMOS fuse-control FET |
| REG | Regulated supply output | 3.0V output (2mA max); requires 0.47µF ceramic cap to VSS; self-disables if any cell <2.5V for 6s |
Key Features
| Feature | Design Value |
|---|---|
| Per-cell OVP monitoring | Independent sensing of V1–VSS, V2–V1, V3–V2, V4–V3 enables accurate fault isolation in stacked configurations |
| Factory-programmed OVP | 4.55V threshold with ±10mV accuracy eliminates external resistor networks and calibration effort |
| Self-disabling REG output | Automatically disables 3.0V supply when any cell falls below 2.5V for 6s, preventing deep discharge damage |
| Low-quiescent current | 1.2µA ICC with REG off extends battery shelf life beyond 10 years in storage applications |
| Customer Test Mode (CTM) | Enables fast 15ms OV delay verification during pack testing without full 6.5s wait time |
Applications
| Medical Portable Devices | Notebook PC Battery Packs |
|---|---|
Use Scenario: Power management in portable ultrasound or infusion pumps requiring long shelf life and fail-safe battery protection. IC Role / Device Role / Timing Role: Second-level OVP monitor that triggers fuse blow before cell voltage exceeds 4.55V, with 6.5s delay allowing system-level fault logging. Use Value: Prevents thermal runaway while powering RTC and memory retention via 3.0V REG output during standby. |
Use Scenario: Overvoltage protection in slim-profile laptop battery packs with 3S or 4S Li-ion configurations. IC Role / Device Role / Timing Role: Independent cell monitoring IC that asserts active-high OUT to gate NMOS fuse-control FET upon any cell overvoltage. Use Value: Enables compact layout with 2mm × 2mm WSON package and eliminates need for external voltage references or timers. |
| UPS Battery Backup Systems | Industrial Handheld Scanners |
Use Scenario: Secondary protection layer in enterprise-grade UPS modules where primary protection may fail. IC Role / Device Role / Timing Role: Standby-mode protector that remains active at 1.2µA, detecting overvoltage during charging cycles even when main controller is asleep. Use Value: Guarantees 4.55V ±10mV trip point across –40°C to +110°C, ensuring reliability in temperature-variable data centers. |
Use Scenario: Ruggedized barcode scanners used in warehouse logistics with frequent charge/discharge cycles. IC Role / Device Role / Timing Role: Cell-balancing-agnostic OVP supervisor that operates without communication bus, reducing BOM count. Use Value: Delivers 3.0V regulated power to MCU and display backlight during wake-up, eliminating separate LDO. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar overvoltage protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BQ296223DSGT | Same 4.55V OVP, 6.5s delay, but 3.3V REG output instead of 3.0V | Requires redesign of downstream 3.0V circuits; suitable when higher REG voltage improves RTC stability | Select if system load tolerates 3.3V and benefits from tighter 3.3V regulation (±33mV vs. ±30mV) |
| BQ296231DSGT | 4.60V OVP threshold (50mV higher), identical 6.5s delay and 3.0V REG | Allows higher charge termination voltage; increases risk of accelerated cell aging at 4.60V | Choose only if battery chemistry supports 4.60V/cell and application demands maximum energy density |
Compared with BQ296228DSGT, BQ296223DSGT shifts regulator voltage upward (3.3V) for improved noise margin in noisy environments, while BQ296231DSGT raises OVP to 4.60V - trading safety margin for capacity in chemistries validated for higher voltage.
Availability
BQ296228DSGT is available at Aetrix Electronics and suitable for notebook PC battery packs, medical portable devices, UPS battery backup systems, and industrial handheld scanners requiring stable component supply across extended product lifecycles.
Supply support for BQ296228DSGT 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 battery protection IP and AEC-Q200 qualified design heritage.
The BQ296xxx family was designed specifically for secondary overvoltage protection in multi-cell Li-ion battery packs, emphasizing ultra-low quiescent current, factory-trimmed precision, and integrated regulated supply to simplify pack-level safety architecture.
FAQ
What is the exact overvoltage threshold and accuracy of the BQ296228DSGT?
The BQ296228DSGT has a factory-programmed overvoltage protection threshold of 4.55V with ±10mV accuracy at 25°C and ±54mV accuracy across –40°C to +110°C. This value is laser-trimmed during manufacturing and cannot be adjusted externally. The BQ296228DSGT uses a precision bandgap reference and matched comparator architecture to maintain this specification without external components.
How does the regulated 3.0V output on the BQ296228DSGT behave during battery discharge?
The BQ296228DSGT's REG pin delivers a stable 3.0V output up to 2mA, but automatically disables when any monitored cell voltage falls below the factory-set 2.5V undervoltage threshold for ≥6 seconds. Once all cells rise above 2.5V + 300mV hysteresis, REG re-enables. This self-disable prevents excessive battery drain during deep discharge, extending pack service life.
What is the purpose of the fixed 6.5-second delay timer in the BQ296228DSGT?
The BQ296228DSGT's internal 6.5-second delay timer provides a deterministic response window after overvoltage detection, allowing time for system-level diagnostics or graceful shutdown before triggering the active-high OUT signal. This delay is factory-fixed and not user-configurable, ensuring consistent fuse-blow timing across production units and eliminating timing variability from external RC networks.
Can the BQ296228DSGT support 2-series, 3-series, and 4-series Li-ion configurations?
Yes, the BQ296228DSGT supports 2S, 3S, and 4S Li-ion battery stacks via its four independent cell sense inputs (V1–VSS, V2–V1, V3–V2, V4–V3). Unused sense pins (e.g., V4 in a 3S pack) are shorted to the adjacent lower pin. All configurations use the same 4.55V OVP threshold per cell and retain full 6.5s delay and 3.0V REG functionality.
What package type and thermal characteristics does the BQ296228DSGT use?
The BQ296228DSGT uses an 8-pin WSON package (2.0mm × 2.0mm, 0.5mm pitch) with exposed thermal pad connected to VSS. Its junction-to-board thermal resistance (RθJB) is 32.5°C/W, enabling reliable operation at 110°C ambient when mounted on standard 2-layer PCBs with adequate copper pour under the pad. No heatsink is required for typical battery pack power dissipation.
BQ296228DSGT 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)
BQ296228DSGT FAQ
1.How can I place an order for BQ296228DSGT through Aetrix?
Please submit a Request for Quotation (RFQ) for BQ296228DSGT 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 BQ296228DSGT reliable?
The price and inventory of BQ296228DSGT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BQ296228DSGT is usually 5 days.
3.What payment methods are accepted for BQ296228DSGT?
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Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BQ296228DSGT?
BQ296228DSGT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BQ296228DSGT 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 BQ296228DSGT?
For technical support, including BQ296228DSGT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BQ296228DSGT requirements.
6.How does Aetrix verify that BQ296228DSGT is sourced from the original manufacturer or authorized distributors?
All BQ296228DSGT 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 BQ296228DSGT meets industry standards.
7.What is the process for return or replacement of BQ296228DSGT?
All BQ296228DSGT units undergo pre-shipment inspection (PSI). If there is an issue with BQ296228DSGT, 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 BQ296228DSGT part is unused and in its original packaging.
Return procedure for BQ296228DSGT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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