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Texas Instruments BQ296112DSGT
- Part No.:
- BQ296112DSGT
- Manufacturer:
- Texas Instruments
- Category:
- Battery Management
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
BQ296112DSGT.pdf
- Description:
- IC BATT PROT LI-ION 2-4CEL 8WSON
- Quantity:
- Payment:
- Shipping:
Inventory:990
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Product details
Overview
BQ296112DSGT 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, 3-second fixed delay timer, ±10 mV OVP accuracy, and 3.3 V regulated output supply delivering up to 2 mA. It serves as second-level protection in notebook PC battery management systems.
For engineers reviewing the BQ296112DSGT datasheet, BQ296112DSGT pinout, BQ296112DSGT application, or BQ296112DSGT equivalent, this page delivers verified technical context, real-world design meaning of key specs, validated pin functions, confirmed alternative options, and supply support for industrial battery pack development.
Technical Context
The BQ296112DSGT independently monitors each cell voltage (V1–VSS through V4–V3) against a preprogrammed 4.50 V overvoltage threshold with 300 mV hysteresis and ±10 mV accuracy at 25°C. Upon detection, it triggers a fixed 3-second internal delay before asserting the CMOS-active-high OUT signal to drive an external NMOS FET for fuse blow control.
Its integrated 3.3 V regulated supply (REG) delivers up to 2 mA with self-disable logic: REG shuts down when any cell voltage falls below the factory-set 2.5 V undervoltage threshold for 6 seconds, preventing battery drain. Supply current is 4 µA (REG on) or 1.2 µA (REG off), with per-cell input leakage <100 nA.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| OVP Threshold | 4.50 V ±10 mV - precise, factory-trimmed trip point enabling reliable cell-level overvoltage cutoff without calibration. |
| OVP Delay Timer | 3.0 s (±20%) - fixed internal timing ensures consistent fault response window before OUT assertion. |
| Regulated Output | 3.3 V ±30 mV @ 0–2 mA - stable supply for RTC or always-on circuits; includes short-circuit current limiting (4 mA). |
| Supply Current | 4 µA (REG enabled) / 1.2 µA (REG disabled) - ultra-low quiescent power extends battery shelf life during storage. |
| Cell Input Leakage | <100 nA per Vx pin - minimizes parasitic discharge across sense resistors, preserving cell voltage accuracy. |
| Operating Temp | –40°C to +110°C - qualified for harsh environments including ultrabook battery packs and medical backup systems. |
| Package | 8-pin WSON (2.0 mm × 2.0 mm) - compact footprint compatible with space-constrained battery PCB layouts. |
Pinout & Package
8-pin WSON package (2.00 mm × 2.00 mm) with exposed thermal pad connected to VSS. Pin 1 is top-left corner (OUT), pin numbering follows standard counter-clockwise orientation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| OUT (Pin 8) | CMOS active-high fault output | Drives NMOS gate to short fuse to ground upon OVP; sinks ≥4.5 mA during fault, pulls to VDD when asserted. |
| VSS (Pin 6) | Ground reference & cell stack negative terminal | Common return for all analog inputs and REG output; must be connected first during assembly to prevent REG damage. |
| V1 (Pin 5) | Lowest cell positive sense input | Measures voltage across bottom cell (V1–VSS); requires RC filter (1 kΩ + 0.1 µF) for noise immunity. |
| V2 (Pin 4) | Second cell positive sense input | Measures voltage across middle cell (V2–V1); shares same RC filter spec as V1–V4 inputs. |
| V3 (Pin 3) | Third cell positive sense input | Measures voltage across third cell (V3–V2); unused pins (e.g., V4 in 2-series config) must be shorted to adjacent Vx. |
| V4 (Pin 2) | Top cell positive sense input | Measures voltage across highest cell (V4–V3); supports up to 4-series stacks; open or shorted if unused. |
| VDD (Pin 1) | Unregulated power input | Accepts 3–20 V; powers internal circuitry and REG LDO; requires RC filter (≤1 kΩ + 0.1 µF) for stability. |
| REG (Pin 7) | 3.3 V regulated output | Supplies up to 2 mA to external RTC; self-disables if any cell drops below 2.5 V for 6 s; requires 0.47 µF ceramic cap to VSS. |
Key Features
| Feature | Design Value |
|---|---|
| Factory-programmed OVP | 4.50 V threshold with ±10 mV accuracy enables drop-in replacement without system-level recalibration. |
| Fixed 3-s OVP delay | Eliminates need for external timing components and reduces BOM count in battery protection IC designs. |
| Self-disabling 3.3 V REG | Automatically disables regulated output when any cell falls below 2.5 V, preventing deep discharge and extending pack life. |
| Ultra-low leakage sensing | <100 nA per cell input preserves voltage integrity across high-value sense resistors in multi-cell monitoring networks. |
| Compact WSON package | 2 mm × 2 mm footprint allows integration into slim battery packs where board area is constrained by mechanical housing. |
Applications
| Notebook PC Battery Packs | Ultrabook Power Management |
|---|---|
|
Use Scenario: Monitors 3-series Li-ion cells in thin-profile laptop battery modules during charging and standby. IC Role / Device Role / Timing Role: Second-level overvoltage protector that asserts OUT after 3 s to trigger fuse blow if any cell exceeds 4.50 V. Use Value: Prevents thermal runaway by cutting power path before cell voltage reaches hazardous levels, meeting UL 2054 safety requirements. |
Use Scenario: Provides regulated 3.3 V supply to real-time clock and fuel gauge ICs while protecting 4-series battery stacks. IC Role / Device Role / Timing Role: Dual-function IC delivering precision OVP and always-on power; REG self-disables below 2.5 V to avoid brownout. Use Value: Enables zero-power RTC operation during storage while eliminating need for separate LDO, reducing component count by one. |
| Medical Portable Devices | UPS Battery Backup Systems |
|
Use Scenario: Secures sealed Li-ion packs in portable diagnostic equipment requiring long shelf life and fail-safe shutdown. IC Role / Device Role / Timing Role: Low-leakage (100 nA/cell) monitor ensures minimal self-discharge during 2-year shelf storage; 4 µA ICC extends runtime. Use Value: Maintains accurate state-of-charge reporting over extended idle periods without compromising safety margins. |
Use Scenario: Protects 4-series backup batteries in enterprise UPS units subject to frequent charge/discharge cycles and temperature swings. IC Role / Device Role / Timing Role: High-temp rated (–40°C to +110°C) OVP detector with 300 mV hysteresis prevents nuisance trips during transient voltage spikes. Use Value: Ensures uninterrupted backup operation by rejecting false OVP events caused by load switching or grid transients. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar overvoltage protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BQ296113DSGT | 4.35 V OVP threshold, same 3-s delay and 3.3 V REG output | Suitable for lower-voltage Li-ion chemistries (e.g., LFP-tolerant designs) where 4.50 V is excessive | Select when tighter OVP margin is required to accommodate cell voltage variance or aging effects |
| BQ296212DSGT | Same 4.50 V OVP and 3-s delay, but BQ2962 family offers 3.15 V REG option instead of 3.3 V | Used where downstream RTC or MCU requires 3.15 V nominal supply (e.g., certain TI MSP430 variants) | Choose only if 3.15 V REG matches system voltage rail requirements; not pin-compatible due to different REG voltage option mapping |
Compared with BQ296112DSGT, BQ296113DSGT provides lower OVP sensitivity for conservative cell protection, while BQ296212DSGT shifts regulated output to 3.15 V-requiring schematic review for compatibility with existing 3.3 V loads.
Availability
BQ296112DSGT is available at Aetrix Electronics and suitable for notebook PC battery packs, ultrabook power management systems, and medical portable device designs requiring stable component supply with full lifecycle support.
Supply support for BQ296112DSGT 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 solutions.
The BQ296xxx family was designed specifically for second-level overvoltage protection in multi-cell Li-ion battery packs, integrating precision voltage monitoring, configurable delay timing, and regulated auxiliary power in a single compact IC.
FAQ
What is the factory-programmed overvoltage threshold for BQ296112DSGT?
The BQ296112DSGT has a factory-programmed overvoltage threshold of 4.50 V with ±10 mV accuracy at 25°C. This value is laser-trimmed during production and cannot be adjusted externally. The threshold remains stable across temperature (±54 mV at 110°C) and supports reliable second-level protection without system-level calibration.
How does the regulated output (REG) of BQ296112DSGT behave during battery discharge?
The BQ296112DSGT's REG pin delivers a stable 3.3 V output until any monitored cell voltage falls below the factory-set 2.5 V undervoltage threshold for 6 seconds, at which point REG self-disables to prevent further battery drain. REG re-enables only after all cell voltages exceed 2.5 V + 300 mV hysteresis, ensuring safe restart.
Is BQ296112DSGT pin-compatible with other BQ2961 variants like BQ296113DSGT?
Yes, BQ296112DSGT is pin-compatible with all BQ2961xx variants in the 8-pin WSON package, including BQ296113DSGT. The pinout, package dimensions, and electrical interface are identical; only factory-programmed parameters (OVP threshold, delay time, UV threshold, REG voltage) differ between part numbers.
What external components are required for stable operation of BQ296112DSGT?
BQ296112DSGT requires four 1 kΩ + 0.1 µF RC filters (one per Vx pin), a 0.47 µF ceramic capacitor on REG to VSS, and a 0.1 µF capacitor on VDD to VSS. A 100 Ω resistor is recommended between OUT and external NMOS gate. No external timing components are needed-the 3-second delay is fully internal.
Can BQ296112DSGT be used in 2-series battery configurations?
Yes, BQ296112DSGT supports 2-, 3-, and 4-series Li-ion configurations. For 2-series use, connect V1 to lowest cell positive, V2 to top cell positive, short V3 to V2, short V4 to V3, and leave no connections on unused sense pins. VSS must be connected first during assembly to prevent REG damage.
BQ296112DSGT 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)
BQ296112DSGT FAQ
1.How can I place an order for BQ296112DSGT through Aetrix?
Please submit a Request for Quotation (RFQ) for BQ296112DSGT 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 BQ296112DSGT reliable?
The price and inventory of BQ296112DSGT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BQ296112DSGT is usually 5 days.
3.What payment methods are accepted for BQ296112DSGT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BQ296112DSGT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BQ296112DSGT?
BQ296112DSGT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BQ296112DSGT 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 BQ296112DSGT?
For technical support, including BQ296112DSGT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BQ296112DSGT requirements.
6.How does Aetrix verify that BQ296112DSGT is sourced from the original manufacturer or authorized distributors?
All BQ296112DSGT 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 BQ296112DSGT meets industry standards.
7.What is the process for return or replacement of BQ296112DSGT?
All BQ296112DSGT units undergo pre-shipment inspection (PSI). If there is an issue with BQ296112DSGT, 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 BQ296112DSGT part is unused and in its original packaging.
Return procedure for BQ296112DSGT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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