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Texas Instruments BQ296222DSGR
- Part No.:
- BQ296222DSGR
- Manufacturer:
- Texas Instruments
- Category:
- Battery Management
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
BQ296222DSGR.pdf
- Description:
- IC BATT PROT LI-ION 2-4CEL 8WSON
- Quantity:
- Payment:
- Shipping:
Inventory:2,668
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Product details
Overview
BQ296222DSGR from Texas Instruments is a high-accuracy, low-power overvoltage protector IC for 2–4 series Li-ion battery packs, featuring factory-programmed 4.50 V OVP threshold, 6.5 s fixed delay timer, 3.0 V regulated output (±1.5% accuracy), ±10 mV OVP detection accuracy, and <100 nA per-cell input leakage. It serves as second-level protection in notebook PC battery management systems.
For engineers reviewing the BQ296222DSGR datasheet, BQ296222DSGR pinout, BQ296222DSGR application, or BQ296222DSGR equivalent, this page delivers verified technical context, validated pin functions, confirmed operating conditions (–40°C to +110°C), real-world timing behavior (OV fault response with 6.5 s delay), and precise regulator performance (3.0 V @ 2 mA, self-disable at cell UV <3.0 V).
Technical Context
The BQ296222DSGR independently monitors each cell voltage (V1–VSS to V4–V3) against a factory-trimmed 4.50 V overvoltage threshold with ±10 mV accuracy and 300 mV hysteresis. Upon detection, it initiates a fixed 6.5 s internal delay before asserting the CMOS-active-high OUT signal to trigger external FET-based fuse blow circuitry.
Its integrated 3.0 V regulated supply delivers up to 2 mA with ±1.5% load regulation (0–2 mA), self-disables when any cell drops below 3.0 V (with 6 s UV delay and 300 mV hysteresis), and draws only 1.2 µA quiescent current when disabled - enabling always-on RTC support without battery drain.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| OVP Threshold | 4.50 V ±10 mV - factory-programmed precision reference for cell overvoltage detection |
| OVP Delay Timer | 6.5 s ±20% - fixed internal delay before OUT assertion prevents false trips during transient spikes |
| Regulated Output | 3.0 V ±1.5% @ 0–2 mA - powers RTC or low-power logic without external LDO |
| UV Self-Disable Threshold | 3.0 V ±50 mV - disables REG output when any cell falls below safe discharge level |
| Supply Current (REG on) | 4–8 µA - ultra-low ICC enables multi-year battery pack shelf life |
| Per-Cell Input Leakage | <100 nA - minimizes imbalance drift in stacked Li-ion configurations |
| Operating Temperature | –40°C to +110°C - supports industrial and medical battery pack environments |
Pinout & Package
Package: 8-pin WSON (2.00 mm × 2.00 mm), thermally enhanced with exposed pad connected to VSS.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD | Power supply input | Unregulated input (3–20 V); powers internal circuitry and REG LDO |
| VSS | Ground reference | IC ground and negative terminal of lowest cell; must be connected first during assembly |
| V1 | Cell voltage sense | Sense input for bottom cell (V1–VSS); requires RC filter for noise immunity |
| V2 | Cell voltage sense | Sense input for second cell (V2–V1); supports 2–4 series stack monitoring |
| V3 | Cell voltage sense | Sense input for third cell (V3–V2); unused pins shorted to adjacent Vx in lower-series configs |
| V4 | Cell voltage sense | Sense input for top cell (V4–V3); enables full 4-series protection coverage |
| OUT | Fault signal output | CMOS active-high output; drives NMOS gate to blow fuse during OVP event |
| REG | Regulated supply output | 3.0 V output (max 2 mA); self-disables if any cell <3.0 V; requires 0.47 µF ceramic cap |
Key Features
| Feature | Design Value |
|---|---|
| Factory-programmed OVP | 4.50 V threshold with ±10 mV accuracy eliminates external resistor trimming |
| Fixed-delay OV response | 6.5 s delay prevents nuisance tripping during charger voltage overshoot |
| Self-disabling 3.0 V regulator | Automatically shuts down when any cell falls below 3.0 V, preventing deep discharge |
| Ultra-low quiescent current | 1.2 µA with REG disabled extends battery shelf life beyond 10 years |
| Per-cell independent monitoring | Detects overvoltage on any single cell in 2–4 series stacks without shared reference errors |
Applications
| Notebook PC Battery Packs | Ultrabook Power Management |
|---|---|
Use Scenario: Integrated into multi-cell Li-ion battery packs to prevent overcharging during AC adapter operation or fast charging. IC Role / Device Role / Timing Role: Second-level OVP monitor that triggers fuse blow after 6.5 s delay upon detecting >4.50 V on any cell. Use Value: Prevents thermal runaway by enforcing strict cell voltage limits while allowing normal charge termination algorithms to operate first. |
Use Scenario: Powers real-time clock and fuel gauge microcontrollers during system sleep or hibernation modes. IC Role / Device Role / Timing Role: Provides stable 3.0 V regulated supply with automatic shutdown when pack voltage drops below 3.0 V/cell. Use Value: Eliminates need for separate RTC LDO, reduces BOM count, and avoids battery drain during long-term storage. |
| Medical Portable Devices | UPS Battery Backup Systems |
Use Scenario: Ensures compliance with IEC 62133 safety requirements for rechargeable Li-ion cells in handheld diagnostics equipment. IC Role / Device Role / Timing Role: Monitors individual cell voltages in 3-series medical battery modules and asserts fault signal to disable charging path. Use Value: Delivers ±10 mV OVP accuracy required for Class II medical device certification and traceable fault logging. |
Use Scenario: Protects lead-acid or Li-ion backup batteries in telecom or data center UPS units during grid instability or generator switchover. IC Role / Device Role / Timing Role: Detects overvoltage during regenerative braking or inverter feedback events and isolates battery via external FET control. Use Value: Enables reliable 4-series stack protection with <100 nA per-cell leakage to maintain state-of-charge accuracy over 5+ year service life. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar overvoltage protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BQ296221DSGR | Same 8-pin WSON package; identical 4.55 V OVP threshold and 6.5 s delay but 3.3 V REG output | Requires redesign of downstream 3.0 V logic to tolerate 3.3 V supply; no change to OVP timing or cell sensing | Select when existing RTC or supervisor IC requires 3.3 V bias instead of 3.0 V |
| BQ296230DSGR | Same package and 3.0 V REG; differs in OVP threshold (4.35 V) and UV threshold (3.0 V), same 6.5 s delay | Triggers earlier on cell overvoltage (4.35 V vs. 4.50 V), better suited for conservative chemistries like LFP or aged NMC | Select for battery packs using lower-voltage Li-ion variants or requiring tighter OVP margin |
Compared with BQ296222DSGR, BQ296221DSGR offers higher regulated output voltage (3.3 V) but identical timing and sensing architecture, while BQ296230DSGR lowers the OVP threshold to 4.35 V for enhanced safety margin - both retain the same 3.0 V UV self-disable and 8-pin WSON footprint.
Availability
BQ296222DSGR is available at Aetrix Electronics and suitable for notebook PC battery packs, ultrabook power management systems, and medical portable devices requiring stable component supply across extended production lifecycles.
Supply support for BQ296222DSGR 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 in multi-cell Li-ion battery packs, integrating precision voltage monitoring, programmable delay timers, and regulated auxiliary supplies to simplify safety-critical BMS architectures.
FAQ
What is the exact overvoltage protection threshold programmed into BQ296222DSGR?
The BQ296222DSGR has a factory-programmed overvoltage protection threshold of 4.50 V with ±10 mV accuracy at 25°C and ±54 mV accuracy across –40°C to +110°C. This value is laser-trimmed during manufacturing and cannot be adjusted externally - it directly determines the cell voltage at which the 6.5 s delay timer initiates.
How does the regulated 3.0 V output of BQ296222DSGR behave under load and fault conditions?
The BQ296222DSGR delivers 3.0 V ±1.5% from 0 to 2 mA load current, with short-circuit current limiting at 4 mA. It self-disables when any monitored cell voltage falls below 3.0 V (±50 mV), re-enabling only after all cells exceed 3.0 V + 300 mV hysteresis. The REG pin requires a 0.47 µF ceramic capacitor to VSS for stability.
Can BQ296222DSGR be used in a 2-cell battery configuration?
Yes - BQ296222DSGR supports 2-, 3-, and 4-series Li-ion stacks. For 2-cell use, connect V1 to bottom cell positive, V2 to top cell positive, VSS to bottom cell negative, and short V3 and V4 to V2. The device automatically ignores unconnected sense inputs above the active stack height and maintains full ±10 mV OVP accuracy on monitored cells.
What is the purpose of the PWPD pin on BQ296222DSGR, and how should it be handled?
The PWPD pin on BQ296222DSGR is the exposed thermal pad, designated as Pin 9 in functional descriptions. TI specifies it must be electrically connected to VSS on the PCB for thermal dissipation and ESD robustness. No external circuitry or voltage is applied to PWPD - it is not an active signal pin but a mechanical/thermal interface critical for reliability and 110°C operation.
Does BQ296222DSGR provide undervoltage protection for the entire battery pack?
No - BQ296222DSGR implements per-cell undervoltage detection solely to control its own 3.0 V REG output. It disables REG when any single cell drops below 3.0 V (with 6 s delay and 300 mV hysteresis) to prevent deep discharge, but it does not assert the OUT pin or trigger fuse blow for undervoltage events. Primary pack-level UV protection must be implemented separately in the BMS.
BQ296222DSGR 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)
BQ296222DSGR FAQ
1.How can I place an order for BQ296222DSGR through Aetrix?
Please submit a Request for Quotation (RFQ) for BQ296222DSGR 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 BQ296222DSGR reliable?
The price and inventory of BQ296222DSGR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BQ296222DSGR is usually 5 days.
3.What payment methods are accepted for BQ296222DSGR?
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Note: Certain payment methods may incur a processing fee.
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BQ296222DSGR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BQ296222DSGR 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 BQ296222DSGR?
For technical support, including BQ296222DSGR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BQ296222DSGR requirements.
6.How does Aetrix verify that BQ296222DSGR is sourced from the original manufacturer or authorized distributors?
All BQ296222DSGR 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 BQ296222DSGR meets industry standards.
7.What is the process for return or replacement of BQ296222DSGR?
All BQ296222DSGR units undergo pre-shipment inspection (PSI). If there is an issue with BQ296222DSGR, 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 BQ296222DSGR part is unused and in its original packaging.
Return procedure for BQ296222DSGR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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