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Texas Instruments BQ296234DSGR
- Part No.:
- BQ296234DSGR
- Manufacturer:
- Texas Instruments
- Category:
- Battery Management
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
BQ296234DSGR.pdf
- Description:
- OVERVOLTAGE PROTECTION FOR 2-SER
- Quantity:
- Payment:
- Shipping:
Inventory:3,000
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Product details
Overview
BQ296234DSGR from Texas Instruments is a high-accuracy, low-power overvoltage protector IC for 2–4 series Li-ion battery packs, featuring factory-programmed 4.60 V OVP threshold, 6.5 s fixed delay timer, active-high CMOS OUT signal, 3.0 V regulated supply output (±30 mV accuracy), and <100 nA per-cell input leakage. It safeguards notebook PC battery packs by triggering external FETs to blow fuses during overvoltage events.
For engineers reviewing the BQ296234DSGR datasheet, BQ296234DSGR pinout, BQ296234DSGR application, or BQ296234DSGR equivalent, this page delivers verified technical context, exact pin functions, real-world use cases in medical and UPS systems, and validated alternative options with documented functional differences.
Technical Context
The BQ296234DSGR independently monitors each cell voltage (V1–VSS to V4–V3) against a ±10 mV accurate, factory-set 4.60 V overvoltage threshold and initiates a precise 6.5 s internal delay before asserting its active-high OUT signal. Its regulated 3.0 V output delivers up to 2 mA while self-disabling when any cell falls below the factory-configured 3.0 V undervoltage threshold after a 6 s delay.
This device operates across –40°C to +110°C with 4 µA supply current (REG enabled) and 1.2 µA (REG disabled), uses an 8-pin WSON (2 mm × 2 mm) package, and integrates hysteresis (300 mV typical) and ESD protection (2 kV HBM) for robust battery pack integration.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| OVP Threshold | 4.60 V ±10 mV at 25°C - enables precise cell-level overvoltage cutoff without false triggers in multi-cell stacks. |
| OVP Delay Timer | 6.5 s fixed internal delay - provides deterministic fault response time for fuse-blowing circuitry. |
| Regulated Output | 3.0 V ±30 mV @ 0–2 mA - powers RTC or always-on logic without external LDO, with self-disable on cell undervoltage. |
| Supply Current | 4 µA (REG on), 1.2 µA (REG off) - minimizes standby drain on battery packs during storage or idle. |
| Input Leakage | <100 nA per cell input - preserves cell balance and avoids measurement error in high-impedance sensing networks. |
| Operating Temp | –40°C to +110°C - supports operation in demanding environments like medical devices and industrial UPS systems. |
| ESD Rating | 2000 V HBM - ensures reliability during PCB handling and battery pack assembly. |
Pinout & Package
Package: 8-pin WSON (2.00 mm × 2.00 mm), exposed thermal pad (PWPD) recommended to be connected to VSS.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD | Power supply input | Unregulated input (3–20 V); powers internal circuitry and supplies REG output stage. |
| 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 RC filter for noise immunity. |
| V2 | Cell 2 sense input | Sense positive terminal of second cell (V2–V1); unused pins shorted to adjacent lower pin in 2-/3-series configs. |
| V3 | Cell 3 sense input | Sense positive terminal of third cell (V3–V2); supports full 4-series monitoring when all Vx pins used. |
| V4 | Cell 4 sense input | Sense positive terminal of top cell (V4–V3); required only in 4-series configurations. |
| OUT | Overvoltage fault output | CMOS active-high signal; drives NMOS gate to short fuse to ground upon OVP detection after 6.5 s delay. |
| REG | Regulated supply output | 3.0 V output (max 2 mA); self-disables if any cell drops below 3.0 V for 6 s; requires 0.47 µF ceramic capacitor to VSS. |
Key Features
| Feature | Design Value |
|---|---|
| Factory-programmed OVP | 4.60 V threshold with ±10 mV accuracy at 25°C ensures consistent, production-ready overvoltage protection without calibration. |
| Fixed-delay OV response | 6.5 s deterministic delay allows system-level fault confirmation before irreversible fuse activation. |
| Self-disabling regulated output | 3.0 V REG output automatically shuts down when any cell falls below 3.0 V, preventing deep discharge and preserving battery health. |
| Ultra-low input leakage | <100 nA per cell input minimizes imbalance drift and extends pack runtime in long-term storage applications. |
| Small-footprint WSON package | 2 mm × 2 mm 8-pin WSON enables compact placement directly on battery module PCBs with minimal board area. |
Applications
| Notebook PC Battery Protection | Medical Portable Device Backup |
|---|---|
Use Scenario: Monitors 3-series Li-ion cells in ultrabook battery packs during charging cycles where charger IC may overshoot voltage limits. IC Role / Device Role / Timing Role: Second-level hardware OVP guard; asserts active-high OUT after 6.5 s to trigger fuse-blowing FET when any cell exceeds 4.60 V. Use Value: Prevents thermal runaway by enabling irreversible power cutoff independent of host MCU or charger firmware failures. |
Use Scenario: Powers real-time clock and low-power microcontroller in portable defibrillators during standby, using regulated 3.0 V output. IC Role / Device Role / Timing Role: Dual-function protector and supply source; maintains RTC operation while self-disabling REG if cell voltage drops below 3.0 V for 6 s. Use Value: Eliminates need for separate LDO and OVP IC, reducing BOM count and failure points in life-critical medical battery modules. |
| UPS Battery Backup System | Industrial Handheld Scanner Pack |
Use Scenario: Protects 4-series Li-ion backup batteries in telecom UPS units exposed to wide ambient temperature swings (–40°C to +110°C). IC Role / Device Role / Timing Role: High-accuracy cell monitor with ±10 mV OVP tolerance and 300 mV hysteresis; maintains stable REG output across full temp range. Use Value: Ensures reliable overvoltage cutoff and RTC power delivery even under extreme environmental stress, meeting UL/IEC safety requirements. |
Use Scenario: Integrated into ruggedized handheld barcode scanners requiring long shelf life and resistance to mechanical shock-induced voltage transients. IC Role / Device Role / Timing Role: Low-leakage (100 nA/cell) protector that minimizes self-discharge during 2-year storage; supports fast-fuse response via 6.5 s delay. Use Value: Extends shelf-life and guarantees fail-safe shutdown during accidental overcharge, critical for field-deployed industrial tools. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar overvoltage protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BQ296233DSGR | 4.45 V OVP threshold (vs. 4.60 V), same 6.5 s delay and 3.3 V REG output | Suitable for chemistries with lower max cell voltage (e.g., LiFePO₄); not interchangeable without revalidation of OVP margin. | Select when tighter OVP margin is needed for specific cell chemistry or aging compensation. |
| BQ296221DSGR | 4.55 V OVP threshold, same 6.5 s delay and 3.3 V REG output | Offers intermediate OVP setting between BQ296233 and BQ296234; shares identical pinout and timing behavior. | Choose for balanced OVP headroom in NMC cells operating near upper voltage limit with margin for temperature drift. |
Compared with BQ296234DSGR, BQ296233DSGR lowers OVP by 150 mV for conservative protection, while BQ296221DSGR provides a 50 mV reduction-both retain identical timing, REG functionality, and WSON-8 packaging, enabling drop-in replacement only after verifying OVP threshold alignment with cell voltage profile.
Availability
BQ296234DSGR is available at Aetrix Electronics and suitable for notebook PC battery management, medical portable device backup, and UPS battery backup systems requiring stable component supply, long-lifecycle support, and guaranteed traceable sourcing.
Supply support for BQ296234DSGR 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 precision analog design.
The BQ296xxx family is designed specifically for second-level overvoltage protection in multi-cell Li-ion battery packs, integrating accurate voltage monitoring, programmable delay timing, and regulated auxiliary supply in ultra-small WSON packages.
FAQ
What is the factory-programmed overvoltage threshold for BQ296234DSGR?
The BQ296234DSGR has a factory-programmed overvoltage threshold of 4.60 V with ±10 mV accuracy at 25°C. This value is laser-trimmed during manufacturing and cannot be adjusted externally. The threshold remains stable across temperature (±54 mV at 110°C) and supports reliable second-level protection in 2–4 series Li-ion battery configurations.
Does BQ296234DSGR support 2-cell, 3-cell, and 4-cell battery configurations?
Yes, BQ296234DSGR supports 2-, 3-, and 4-series Li-ion battery stacks. It monitors differential voltages across V1–VSS, V2–V1, V3–V2, and V4–V3. Unused Vx pins (e.g., V3 and V4 in a 2-cell pack) must be shorted to the adjacent lower pin (V2 and V1 respectively) as specified in the datasheet to ensure proper operation and avoid floating inputs.
What is the function of the REG pin on BQ296234DSGR?
The REG pin on BQ296234DSGR delivers a factory-programmed 3.0 V regulated output capable of sourcing up to 2 mA. It powers external circuits such as RTCs or low-power MCUs and self-disables when any monitored cell voltage falls below 3.0 V for 6 seconds. A 0.47 µF ceramic capacitor to VSS is mandatory for stability and noise immunity.
How does the OUT pin behave during an overvoltage event on BQ296234DSGR?
During an overvoltage event, the OUT pin on BQ296234DSGR transitions from low to active-high after a fixed 6.5 s internal delay. It drives CMOS high (VDD – 0.3 V min) with 4.5 mA source capability, intended to control an external NMOS FET that shorts the fuse to ground-enabling battery or charger current to blow the fuse and disconnect the pack.
What package type and thermal characteristics does BQ296234DSGR use?
BQ296234DSGR uses an 8-pin WSON package (2.00 mm × 2.00 mm) with exposed thermal pad (PWPD). Its junction-to-ambient thermal resistance (RθJA) is 62°C/W, and junction-to-board (RθJB) is 32.5°C/W. The exposed pad must be soldered to a VSS copper plane for optimal thermal performance and reliability in high-temperature battery environments.
BQ296234DSGR 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)
BQ296234DSGR FAQ
1.How can I place an order for BQ296234DSGR through Aetrix?
Please submit a Request for Quotation (RFQ) for BQ296234DSGR 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 BQ296234DSGR reliable?
The price and inventory of BQ296234DSGR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BQ296234DSGR is usually 5 days.
3.What payment methods are accepted for BQ296234DSGR?
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Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BQ296234DSGR?
BQ296234DSGR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BQ296234DSGR 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 BQ296234DSGR?
For technical support, including BQ296234DSGR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BQ296234DSGR requirements.
6.How does Aetrix verify that BQ296234DSGR is sourced from the original manufacturer or authorized distributors?
All BQ296234DSGR 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 BQ296234DSGR meets industry standards.
7.What is the process for return or replacement of BQ296234DSGR?
All BQ296234DSGR units undergo pre-shipment inspection (PSI). If there is an issue with BQ296234DSGR, 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 BQ296234DSGR part is unused and in its original packaging.
Return procedure for BQ296234DSGR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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