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Texas Instruments BQ296226DSGT
- Part No.:
- BQ296226DSGT
- Manufacturer:
- Texas Instruments
- Category:
- Battery Management
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
BQ296226DSGT.pdf
- Description:
- IC BATT PROT LI-ION 2-4CEL 8WSON
- Quantity:
- Payment:
- Shipping:
Inventory:250
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Product details
Overview
BQ296226DSGT from Texas Instruments is a high-accuracy, low-power overvoltage protector IC for 2–4 series Li-ion battery packs, featuring factory-programmed 4.50V OVP threshold, 6.5s fixed delay timer, ±10mV OVP accuracy, 3.3V regulated output (2mA max), and 2.8V undervoltage self-disable threshold - used to safeguard notebook PC and medical battery packs against cell overvoltage.
For engineers reviewing the BQ296226DSGT datasheet, BQ296226DSGT pinout, BQ296226DSGT application, or BQ296226DSGT 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 and application differences.
Technical Context
The BQ296226DSGT independently monitors each cell voltage in 2–4 series stacks using precision analog comparators referenced to a factory-trimmed 4.50V overvoltage threshold (±10mV at 25°C, ±54mV over –40°C to +110°C) and initiates a fixed 6.5s internal delay before asserting the active-high OUT signal. Its regulated 3.3V supply delivers up to 2mA while self-disabling when any cell drops below 2.8V, preventing battery drain during deep discharge.
It operates across –40°C to +110°C ambient temperature with supply current as low as 1.2µA when REG is disabled and 4µA when enabled, and supports Customer Test Mode (CTM) for accelerated OV delay verification via VDD–V4 ≥10V differential - all implemented in an 8-pin WSON (2mm × 2mm) package with integrated thermal management (RθJA = 62°C/W).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| OVP Threshold | 4.50V ±10mV at 25°C - ensures precise cell-level overvoltage cutoff without premature tripping in high-accuracy battery protection systems. |
| OVP Delay Timer | 6.5s fixed (min 5.2s, max 7.8s) - provides reliable fault confirmation window before triggering FET drive, reducing false positives from transient spikes. |
| Regulated Output | 3.3V ±30mV at 2mA load - powers always-on RTC or monitoring circuits directly from battery stack without external LDO. |
| Supply Current | 4µA (REG on), 1.2µA (REG off) - enables multi-year operation in backup power applications with minimal quiescent drain. |
| Cell Input Leakage | <100nA per Vx pin - preserves cell balance and extends pack runtime by minimizing parasitic discharge paths. |
| Operating Temp | –40°C to +110°C - supports deployment in demanding environments including medical devices and industrial UPS systems. |
| UV Self-Disable | 2.8V ±50mV with 6s delay - automatically shuts down REG output during deep discharge to prevent irreversible cell damage. |
Pinout & Package
Package: 8-pin WSON (2.00mm × 2.00mm), thermally enhanced with exposed pad connected to VSS.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD | Power supply input | Unregulated input tied to top of battery stack (max 30V); requires RC filter for noise immunity and ESD protection. |
| VSS | Ground reference | IC ground and negative terminal of lowest cell; must be connected first during assembly to avoid REG pin damage. |
| V1–V4 | Cell voltage sense inputs | Differential inputs monitoring (V1–VSS), (V2–V1), (V3–V2), (V4–V3); each requires 1kΩ/0.1µF RC filter for stable measurement. |
| OUT | Active-high fault signal | CMOS output driving NMOS FET gate to short fuse to ground upon OVP detection after 6.5s delay. |
| REG | Regulated supply output | 3.3V output (2mA max) for RTC or monitoring ICs; requires 0.47µF ceramic capacitor near pin for stability and ESD robustness. |
Key Features
| Feature | Design Value |
|---|---|
| Factory-programmed OVP | 4.50V threshold with ±10mV accuracy at 25°C enables drop-in replacement in existing 4.5V-critical battery designs without recalibration. |
| Fixed 6.5s OVP delay | Guaranteed 5.2–7.8s window eliminates need for external timing components and ensures consistent fault response across temperature. |
| Self-disabling 3.3V REG | Automatically disables when any cell falls below 2.8V, preventing battery over-discharge and extending cycle life in medical and UPS applications. |
| Ultra-low ICC | 1.2µA quiescent current with REG off allows >10-year shelf life in backup systems where standby power budget is sub-2µA. |
| Customer Test Mode (CTM) | Enables <15ms OVP delay verification during production test using VDD–V4 ≥10V, cutting test time vs. full 6.5s timeout validation. |
Applications
| Notebook PC Battery Packs | Medical Portable Devices |
|---|---|
Use Scenario: Protecting 3-series Li-ion packs in ultrabooks during fast charging cycles where cell imbalance may cause individual overvoltage. IC Role / Device Role / Timing Role: Second-level OVP monitor that triggers fuse blow only after confirmed 6.5s overvoltage condition, avoiding nuisance trips from charger transients. Use Value: Prevents thermal runaway by ensuring no single cell exceeds 4.50V for more than 6.5s, meeting UL 2054 and IEC 62133 safety requirements. |
Use Scenario: Safeguarding sealed 4-series Li-ion packs in portable defibrillators and infusion pumps requiring guaranteed runtime and fail-safe shutdown. IC Role / Device Role / Timing Role: Dual-function protector providing both overvoltage cutoff and regulated 3.3V supply for real-time clock and memory retention during standby. Use Value: Enables 10+ year shelf life via 1.2µA REG-off current and prevents catastrophic failure via ±10mV OVP accuracy under wide temperature range (–40°C to +110°C). |
| UPS Battery Backup Systems | Industrial Handheld Scanners |
Use Scenario: Monitoring 2-series Li-ion backup batteries in telecom UPS units operating continuously at elevated ambient temperatures. IC Role / Device Role / Timing Role: High-temperature-stable OVP detector with ±54mV accuracy at 110°C and self-disable at 2.8V to preserve capacity during infrequent discharge events. Use Value: Maintains protection integrity over full lifetime without drift-related false trips, reducing field returns in mission-critical infrastructure. |
Use Scenario: Enabling compact 3-series battery packs in ruggedized barcode scanners subject to mechanical shock and wide operating temperature swings. IC Role / Device Role / Timing Role: Space-constrained protector in 2mm × 2mm WSON package delivering accurate OVP and clean 3.3V rail for microcontroller and sensor subsystems. Use Value: Eliminates need for discrete LDO and external timing circuitry, reducing BOM count by 3 components and PCB area by >15mm². |
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 4.50V OVP, 6.5s delay, 3.3V REG, but 2.5V UV self-disable threshold instead of 2.8V. | Suitable for packs where deeper discharge is acceptable before REG disable; less aggressive low-voltage protection. | Select when battery chemistry tolerates lower minimum cell voltage before regulator shutdown. |
| BQ296231DSGT | 4.60V OVP threshold (vs. 4.50V), same 6.5s delay and 3.3V REG, 2.5V UV threshold. | Used in higher-voltage Li-ion variants (e.g., LiCoO₂ with 4.6V max); not suitable for 4.5V-limited chemistries. | Choose only if system requires tighter margin above standard 4.5V charge termination voltage. |
Compared with BQ296226DSGT, BQ296223DSGT offers earlier REG disable (at 2.5V), while BQ296231DSGT raises OVP to 4.60V - making BQ296226DSGT the optimal choice for balanced 4.50V/2.8V protection in mainstream notebook and medical applications.
Availability
BQ296226DSGT is available at Aetrix Electronics and suitable for notebook PC battery management, medical portable device power systems, and UPS backup modules requiring stable component supply, long-term lifecycle support, and guaranteed factory-programmed parameters.
Supply support for BQ296226DSGT 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 safety ICs.
The BQ296xxx family is designed specifically for second-level overvoltage protection in multi-cell Li-ion battery packs, integrating precision voltage monitoring, regulated supply generation, and robust fault signaling in ultra-small packages.
FAQ
What is the exact overvoltage protection threshold and accuracy of BQ296226DSGT?
The BQ296226DSGT has a factory-programmed overvoltage protection threshold of 4.50V with ±10mV accuracy at 25°C, and ±54mV accuracy across the full operating temperature range of –40°C to +110°C. This tight tolerance ensures reliable cell-level protection without false triggering during normal charge termination or transient events, and is verified per TI's SLUSBU5V datasheet Section 6.5.
Does BQ296226DSGT support 2-cell, 3-cell, and 4-cell Li-ion configurations?
Yes, BQ296226DSGT supports 2-series, 3-series, and 4-series Li-ion battery stacks via its four independent cell sense inputs (V1–V4). Unused inputs are shorted to adjacent pins (e.g., V4 to V3 for 3-cell), and the device automatically ignores voltages below 0.5V during undervoltage detection - enabling flexible deployment across multiple pack architectures without hardware changes.
What is the function and specification of the REG pin on BQ296226DSGT?
The REG pin on BQ296226DSGT delivers a factory-programmed 3.3V regulated output capable of sourcing up to 2mA, with ±30mV regulation over load (0–2mA) and temperature. It features self-disable when any cell voltage falls below 2.8V and requires a 0.47µF ceramic capacitor to VSS for stability - powering RTCs or low-power microcontrollers directly from the battery stack.
How does the 6.5-second overvoltage delay timer work in BQ296226DSGT?
The BQ296226DSGT uses an internal fixed-delay timer that starts upon detection of any cell exceeding 4.50V and expires after 6.5 seconds (5.2–7.8s min/max), after which the active-high OUT pin drives high to trigger an external NMOS FET. This delay is factory-trimmed and does not require external components, ensuring consistent fault confirmation across temperature and process variation.
What package type and thermal characteristics does BQ296226DSGT use?
BQ296226DSGT uses an 8-pin WSON package measuring 2.00mm × 2.00mm with an exposed thermal pad. Its thermal resistance is RθJA = 62°C/W, RθJB = 32.5°C/W, and RθJC(bot) = 10°C/W - enabling reliable operation up to +110°C ambient in space-constrained battery pack designs when mounted on standard 2-layer PCBs with adequate copper pour.
BQ296226DSGT 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)
BQ296226DSGT FAQ
1.How can I place an order for BQ296226DSGT through Aetrix?
Please submit a Request for Quotation (RFQ) for BQ296226DSGT 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 BQ296226DSGT reliable?
The price and inventory of BQ296226DSGT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BQ296226DSGT is usually 5 days.
3.What payment methods are accepted for BQ296226DSGT?
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Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BQ296226DSGT?
BQ296226DSGT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BQ296226DSGT 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 BQ296226DSGT?
For technical support, including BQ296226DSGT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BQ296226DSGT requirements.
6.How does Aetrix verify that BQ296226DSGT is sourced from the original manufacturer or authorized distributors?
All BQ296226DSGT 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 BQ296226DSGT meets industry standards.
7.What is the process for return or replacement of BQ296226DSGT?
All BQ296226DSGT units undergo pre-shipment inspection (PSI). If there is an issue with BQ296226DSGT, 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 BQ296226DSGT part is unused and in its original packaging.
Return procedure for BQ296226DSGT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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