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Texas Instruments BQ296232DSGT
- Part No.:
- BQ296232DSGT
- Manufacturer:
- Texas Instruments
- Category:
- Battery Management
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
BQ296232DSGT.pdf
- Description:
- IC BATT PROT LI-ION 2-4CEL 8WSON
- Quantity:
- Payment:
- Shipping:
Inventory:250
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Product details
Overview
BQ296232DSGT 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, 3.0V regulated output (±1.5% accuracy), ±10mV OVP detection accuracy, and <100nA per-cell input leakage. It serves as second-level protection in notebook PC battery management systems.
For engineers reviewing the BQ296232DSGT datasheet, BQ296232DSGT pinout, BQ296232DSGT application, or BQ296232DSGT equivalent, this page delivers verified technical context, real-world design meaning of specifications, validated pin functions, confirmed alternative options, and supply-chain support for industrial and OEM battery pack development.
Technical Context
The BQ296232DSGT independently monitors each cell voltage (V1–VSS to V4–V3) against a factory-set 4.55V overvoltage threshold with ±10mV accuracy and 300mV hysteresis. Upon detection, it initiates a precise 6.5s internal delay before asserting the active-high OUT signal to trigger external FET-based fuse blow circuitry.
Its integrated 3.0V regulated output delivers up to 2mA with self-disable functionality: REG shuts down when any cell voltage falls below the factory-configured 3.0V undervoltage threshold for 6s, preventing battery drain while maintaining RTC or supervisor circuit operation during normal charge/discharge cycles.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| OVP Threshold | 4.55V ±10mV - enables precise cell-level overvoltage cutoff before thermal runaway risk escalates in 3- or 4-series Li-ion stacks. |
| OVP Delay Timer | 6.5s fixed - provides deterministic fault response window for fuse-blow timing without external timing components. |
| Regulated Output | 3.0V ±1.5% at 0–2mA - powers always-on circuits (e.g., RTC) with stable voltage; self-disables if any cell drops below 3.0V. |
| Supply Current (REG on) | ~4µA - minimizes quiescent drain on battery during standby, critical for long-term storage and shelf-life compliance. |
| Per-Cell Input Leakage | <100nA - preserves cell voltage balance across series strings, avoiding drift-induced false OVP/UV trips. |
| Operating Temp Range | –40°C to +110°C - supports automotive-grade and medical battery pack environments with full parameter validity. |
| Package | 8-pin WSON (2mm × 2mm) - enables compact placement on space-constrained battery pack PCBs near cell sense points. |
Pinout & Package
8-pin WSON package (2.00mm × 2.00mm) 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 (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 prevent REG damage. |
| V1 | Cell 1 sense input | Sense positive terminal of bottom cell (V1–VSS); requires 1kΩ/0.1µF RC filter per TI layout guidelines. |
| V2 | Cell 2 sense input | Sense positive terminal of second cell (V2–V1); identical filtering and routing requirements as V1. |
| V3 | Cell 3 sense input | Sense positive terminal of third cell (V3–V2); unused pins for 2- or 3-series configs must be shorted to adjacent lower pin. |
| V4 | Cell 4 sense input | Sense positive terminal of top cell (V4–V3); supports full 4-series monitoring; floating in 2-/3-series designs. |
| OUT | Overvoltage fault output | CMOS active-high signal; drives NMOS gate to short fuse to ground; logic-high = OVP fault asserted after 6.5s delay. |
| REG | Regulated supply output | 3.0V output (max 2mA); requires 0.47µF ceramic capacitor to VSS; self-disables if any cell <3.0V for 6s. |
Key Features
| Feature | Design Value |
|---|---|
| Factory-programmed OVP | 4.55V threshold with ±10mV accuracy ensures consistent, production-ready protection without calibration. |
| Fixed 6.5s OVP delay | Eliminates external timing components and reduces BOM count while guaranteeing repeatable fault response timing. |
| 3.0V regulated output | Stable 3.0V supply with self-disable prevents battery drain during deep discharge, extending usable runtime. |
| Ultra-low leakage | <100nA per cell input maintains voltage balance across series cells, reducing risk of imbalance-induced failure. |
| Active-high fault signaling | Direct CMOS-compatible OUT simplifies interface to NMOS fuse-control FETs without level-shifting or pull-up resistors. |
Applications
| Notebook PC Battery Packs | Ultrabook Power Management |
|---|---|
Use Scenario: Secondary overvoltage protection in multi-cell Li-ion battery modules where primary protection resides in the fuel gauge or charger IC. IC Role / Device Role / Timing Role: Second-level OVP monitor that independently checks each cell voltage and triggers fuse blow via active-high OUT after 6.5s delay. Use Value: Prevents catastrophic cell overcharge during charger IC failure or firmware lockup, meeting UL 2054 and IEC 62133 safety requirements. |
Use Scenario: Compact battery pack design requiring minimal footprint and ultra-low quiescent current for extended standby time. IC Role / Device Role / Timing Role: Provides 3.0V regulated supply to RTC and supervisor circuits while automatically disabling during deep discharge. Use Value: Enables >1-year shelf life without battery replacement; 4µA supply current with REG enabled meets stringent energy budget targets. |
| Medical Portable Devices | UPS Battery Backup Systems |
Use Scenario: Safety-critical battery packs in portable diagnostic equipment where failure modes must be rigorously controlled. IC Role / Device Role / Timing Role: Independent per-cell OVP detector with ±10mV accuracy and 300mV hysteresis to avoid nuisance tripping during transient load spikes. Use Value: Meets ISO 13485 and IEC 60601-1 essential performance requirements for battery-powered medical devices. |
Use Scenario: High-reliability backup power systems where battery longevity and fault containment are paramount. IC Role / Device Role / Timing Role: Monitors 4-series Li-ion stack and asserts OUT to disconnect load/charger upon sustained overvoltage condition. Use Value: Ensures graceful shutdown before cell venting; 110°C max operating temperature supports enclosed UPS enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar overvoltage protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BQ296231DSGT | 4.60V OVP threshold (vs. 4.55V); same 6.5s delay, 3.3V REG output | Higher OVP threshold suits higher-voltage Li-ion chemistries (e.g., NMC with 4.6V max); 3.3V REG better matches legacy RTCs | Select when system requires tighter margin above 4.55V nominal charge voltage or existing 3.3V peripheral compatibility. |
| BQ296224DSGT | 4.50V OVP threshold; same 6.5s delay, 3.0V REG output | Lower OVP threshold increases safety margin for aging cells with reduced overcharge tolerance | Choose for battery packs with known capacity fade or conservative safety policies requiring earlier OVP intervention. |
Compared with BQ296232DSGT, BQ296231DSGT offers higher OVP headroom and 3.3V REG for broader peripheral compatibility, while BQ296224DSGT lowers OVP to 4.50V for enhanced aging-cell safety-both retain identical 6.5s delay and WSON-8 packaging.
Availability
BQ296232DSGT is available at Aetrix Electronics and suitable for notebook PC battery packs, ultrabook power management, and medical portable device designs requiring stable component supply, long-lifecycle support, and guaranteed traceable sourcing.
Supply support for BQ296232DSGT 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 over 90 years of innovation in precision analog ICs.
The BQ296xxx family is designed specifically for secondary overvoltage protection in multi-cell Li-ion battery packs, delivering high-accuracy cell monitoring, regulated auxiliary supply, and robust fault signaling in ultra-small packages.
FAQ
What is the exact overvoltage protection threshold and accuracy of the BQ296232DSGT?
The BQ296232DSGT 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 tight tolerance ensures reliable, repeatable cell-level overvoltage cutoff without field calibration, directly supporting safety certification requirements for Li-ion battery packs.
How does the regulated output (REG) of the BQ296232DSGT behave during battery discharge?
The BQ296232DSGT's REG pin delivers a stable 3.0V output up to 2mA but self-disables when any monitored cell voltage falls below the factory-configured 3.0V undervoltage threshold for 6 seconds. It re-enables only after all cells exceed 3.0V + 300mV hysteresis, preventing excessive battery drain while preserving RTC or supervisor functionality during partial discharge.
What is the purpose and timing of the fixed delay timer in the BQ296232DSGT?
The BQ296232DSGT incorporates a fixed 6.5s internal delay timer that activates upon detection of any cell exceeding 4.55V. This delay prevents nuisance tripping from transient voltage spikes and ensures the overvoltage condition is sustained before asserting the active-high OUT signal to trigger external fuse-blow circuitry-providing deterministic, production-ready fault response.
Which pins require external RC filtering, and what are the recommended values for the BQ296232DSGT?
The BQ296232DSGT requires 1kΩ resistor and 0.1µF capacitor on each cell sense input (V1–VSS through V4–V3) and on VDD for noise filtering. TI specifies RIN = 1kΩ as the calibration reference; deviation affects OVP accuracy. The REG pin requires a minimum 0.47µF ceramic capacitor to VSS placed adjacent to the package for stability and ESD immunity.
Why must the VSS pin be connected first during battery pack assembly for the BQ296232DSGT?
VSS must be connected first to prevent damaging the REG pin during cell attachment. If VSS floats while REG charges to VDD (up to 20V), subsequent VSS connection causes rapid capacitor discharge through the REG pin. TI mandates this sequencing-or adding a 5Ω series resistor-to avoid latch-up or permanent damage, especially critical in automated battery pack manufacturing.
BQ296232DSGT 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)
BQ296232DSGT FAQ
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Please submit a Request for Quotation (RFQ) for BQ296232DSGT on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
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The price and inventory of BQ296232DSGT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BQ296232DSGT is usually 5 days.
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Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
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6.How does Aetrix verify that BQ296232DSGT is sourced from the original manufacturer or authorized distributors?
All BQ296232DSGT 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 BQ296232DSGT meets industry standards.
7.What is the process for return or replacement of BQ296232DSGT?
All BQ296232DSGT units undergo pre-shipment inspection (PSI). If there is an issue with BQ296232DSGT, 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 BQ296232DSGT part is unused and in its original packaging.
Return procedure for BQ296232DSGT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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