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Texas Instruments BQ296221DSGT
- Part No.:
- BQ296221DSGT
- Manufacturer:
- Texas Instruments
- Category:
- Battery Management
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
BQ296221DSGT.pdf
- Description:
- IC BATT PROT LI-ION 2-4CEL 8WSON
- Quantity:
- Payment:
- Shipping:
Inventory:1,481
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Product details
Overview
BQ296221DSGT 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, 3.3V regulated output (2mA max), and 8-pin WSON (2mm × 2mm) package. It serves as second-level protection in notebook PC and medical battery packs.
For engineers reviewing the BQ296221DSGT datasheet, BQ296221DSGT pinout, BQ296221DSGT application, or BQ296221DSGT equivalent, this page delivers verified technical context, real-world design meaning of specifications, validated pin functions, confirmed application use cases, and two rigorously cross-checked alternative parts with documented functional differences.
Technical Context
The BQ296221DSGT independently monitors each cell voltage (V1–VSS to V4–V3) against a factory-trimmed 4.55V overvoltage threshold with ±10mV accuracy at 25°C and 300mV hysteresis. Upon detection, it initiates a fixed 6.5s internal delay before asserting active-high OUT to trigger external FET-based fuse blow.
Its integrated 3.3V regulated supply delivers up to 2mA to always-on circuits (e.g., RTC), self-disables when any cell falls below factory-configured 2.5V undervoltage threshold (with 6s delay and 300mV hysteresis), and draws only 4µA quiescent current during normal operation - dropping to 1.2µA when REG is disabled.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| OVP Threshold | 4.55V ±10mV at 25°C - enables precise cell voltage clamping without external calibration |
| OVP Delay Timer | 6.5s fixed (±20%) - provides deterministic fault response window for fuse activation timing |
| Regulated Output | 3.3V ±30mV @ 0–2mA load - powers RTC or supervisor ICs without external LDO |
| Supply Current (REG on) | 4µA typical (–40°C to +110°C) - extends battery shelf life in standby mode |
| Input Leakage per Cell | <100nA - minimizes parasitic discharge across cell sense inputs |
| Operating Temp Range | –40°C to +110°C - supports industrial and medical battery pack environments |
| Package | 8-pin WSON, 2.0mm × 2.0mm - enables compact placement in space-constrained battery modules |
Pinout & Package
8-pin WSON (2mm × 2mm) package with exposed thermal pad (PWPD) recommended to be connected to VSS for optimal thermal performance and ESD robustness.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD | Power supply input | Unregulated input (3–20V); powers internal circuitry and REG output stage |
| VSS | Ground reference | IC ground and negative terminal of lowest cell; must be connected first during assembly |
| V1 | Cell 1 sense input | Sense positive terminal of bottommost cell (V1–VSS); requires RC filter for noise immunity |
| V2 | Cell 2 sense input | Sense positive terminal of second cell (V2–V1); supports 2–4 series configurations |
| V3 | Cell 3 sense input | Sense positive terminal of third cell (V3–V2); unused pins shorted to adjacent Vx in lower-cell configs |
| V4 | Cell 4 sense input | Sense positive terminal of topmost cell (V4–V3); enables full 4-series monitoring |
| OUT | Overvoltage fault signal | CMOS active-high output; drives NMOS gate to short fuse to ground during OVP event |
| REG | Regulated supply output | 3.3V output (2mA max); self-disables if any cell drops below 2.5V; requires 0.47µF ceramic cap |
Key Features
| Feature | Design Value |
|---|---|
| Factory-programmed OVP | 4.55V threshold with ±10mV accuracy eliminates need for external resistor divider trimming |
| Fixed-delay OV response | 6.5s deterministic delay ensures reliable fuse blow timing without software or external timing components |
| Self-disabling REG output | Automatically disables 3.3V supply when any cell falls below 2.5V - prevents deep discharge damage |
| Ultra-low quiescent current | 4µA supply current (REG on) and 1.2µA (REG off) maximize battery shelf life in storage |
| Low-input leakage | <100nA per cell input minimizes measurement error and avoids cell imbalance drift |
Applications
| Medical Portable Monitor Battery Pack | Notebook PC Smart Battery Module |
|---|---|
Use Scenario: Long-term battery-powered operation with strict safety compliance requirements for patient-connected devices. IC Role / Device Role / Timing Role: Second-level overvoltage protector that triggers fuse blow within 6.5s of cell voltage exceeding 4.55V. Use Value: Prevents thermal runaway by enforcing precise 4.55V cell clamp with ±10mV accuracy - critical for IEC 62368-1 certification. |
Use Scenario: Multi-cell battery pack requiring always-on RTC power and fail-safe overvoltage cutoff. IC Role / Device Role / Timing Role: Provides 3.3V/2mA regulated supply to RTC while independently monitoring all cells for OVP. Use Value: Eliminates need for separate LDO and protection IC - reduces BOM count and PCB area in slim-profile designs. |
| UPS Backup Battery System | Industrial Handheld Scanner Power Management |
Use Scenario: Uninterruptible power supply with extended shelf life and high-reliability fault response. IC Role / Device Role / Timing Role: Monitors 4-series Li-ion stack and asserts active-high OUT to disable charging path upon OVP. Use Value: 6.5s fixed delay ensures sufficient time for system-level shutdown before hardware cutoff - avoids nuisance trips. |
Use Scenario: Ruggedized handheld device operating in variable temperature environments (-40°C to +110°C). IC Role / Device Role / Timing Role: Delivers stable 3.3V supply to microcontroller and sensors while protecting against cell overvoltage during fast charging. Use Value: ±10mV OVP accuracy maintained across full temperature range ensures consistent protection behavior in field conditions. |
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, 3.3V REG; identical pinout and electrical specs | No functional difference - alternate ordering option within same BQ2962 family | Select BQ296223DSGT only for dual-sourcing or inventory flexibility; no design change required |
| BQ296213DSGT | 4.35V OVP threshold (vs. 4.55V), same 3.3V REG and 6.5s delay | Lower OVP point suits conservative chemistries (e.g., LiFePO₄ blends) or tighter safety margins | Choose BQ296213DSGT only if system requires earlier overvoltage intervention - not drop-in compatible due to threshold shift |
Compared with BQ296221DSGT, BQ296223DSGT offers identical functionality for supply chain redundancy, while BQ296213DSGT provides a 200mV lower OVP threshold for applications demanding earlier fault response - both require validation of protection timing and system-level fuse behavior.
Availability
BQ296221DSGT is available at Aetrix Electronics and suitable for notebook PC battery packs, medical portable monitors, and UPS backup systems requiring stable component supply, long-lifecycle support, and guaranteed traceable sourcing.
Supply support for BQ296221DSGT 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 expertise in battery management solutions.
The BQ296xxx product line is designed specifically for second-level overvoltage protection in multi-cell Li-ion battery packs, integrating precision voltage monitoring, regulated supply generation, and fault signaling in ultra-low-power WSON packages.
FAQ
What is the exact overvoltage protection threshold and accuracy of the BQ296221DSGT?
The BQ296221DSGT 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 does not require external calibration - ensuring repeatable, high-precision cell voltage clamping in the BQ296221DSGT.
Does the BQ296221DSGT support 2-cell, 3-cell, and 4-cell battery configurations?
Yes, the BQ296221DSGT supports 2-series, 3-series, and 4-series Li-ion battery stacks via its dedicated V1–V4 sense inputs. Unused higher-order sense pins (e.g., V4 in a 2-cell design) are shorted to the adjacent lower pin (V3), and the device automatically ignores unconnected inputs - enabling flexible configuration without redesign in the BQ296221DSGT.
What is the function and voltage rating of the REG pin on the BQ296221DSGT?
The REG pin on the BQ296221DSGT delivers a factory-configured 3.3V regulated output capable of sourcing up to 2mA to external circuits such as RTCs or supervisors. It features self-disable logic that turns off the output when any monitored cell voltage falls below 2.5V, preventing battery drain - a core safety feature of the BQ296221DSGT.
How does the BQ296221DSGT assert its overvoltage fault signal?
The BQ296221DSGT asserts overvoltage fault via its active-high CMOS OUT pin, which transitions from low to high after a fixed 6.5s internal delay upon detecting any cell voltage exceeding 4.55V. This signal directly drives the gate of an external NMOS FET to short the fuse to ground - enabling battery pack disconnection using charger or pack current in the BQ296221DSGT.
What package type and thermal considerations apply to the BQ296221DSGT?
The BQ296221DSGT uses an 8-pin WSON package (2.0mm × 2.0mm) with an exposed thermal pad (PWPD). Texas Instruments recommends connecting PWPD to VSS on the PCB to achieve optimal thermal resistance (RθJB = 32.5°C/W) and ESD robustness - a critical layout requirement for reliable operation of the BQ296221DSGT.
BQ296221DSGT 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)
BQ296221DSGT FAQ
1.How can I place an order for BQ296221DSGT through Aetrix?
Please submit a Request for Quotation (RFQ) for BQ296221DSGT 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 BQ296221DSGT reliable?
The price and inventory of BQ296221DSGT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BQ296221DSGT is usually 5 days.
3.What payment methods are accepted for BQ296221DSGT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BQ296221DSGT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BQ296221DSGT?
BQ296221DSGT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BQ296221DSGT 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 BQ296221DSGT?
For technical support, including BQ296221DSGT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BQ296221DSGT requirements.
6.How does Aetrix verify that BQ296221DSGT is sourced from the original manufacturer or authorized distributors?
All BQ296221DSGT 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 BQ296221DSGT meets industry standards.
7.What is the process for return or replacement of BQ296221DSGT?
All BQ296221DSGT units undergo pre-shipment inspection (PSI). If there is an issue with BQ296221DSGT, 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 BQ296221DSGT part is unused and in its original packaging.
Return procedure for BQ296221DSGT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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