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Texas Instruments BQ296115DSGR
- Part No.:
- BQ296115DSGR
- Manufacturer:
- Texas Instruments
- Category:
- Battery Management
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
BQ296115DSGR.pdf
- Description:
- 2-4S OVERVOLTAGE PROTECTOR WITH
- Quantity:
- Payment:
- Shipping:
Inventory:5,975
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Product details
Overview
BQ296115DSGR from Texas Instruments is a high-accuracy, low-power overvoltage protection IC for 2–4-series Li-ion battery packs, featuring factory-programmed 4.25V OVP threshold, 6.5s fixed delay timer, ±10mV OVP accuracy, 2.5V regulated output (2mA max), and 8-pin WSON (2mm × 2mm) package. It monitors each cell independently and drives external FETs to blow fuses during overvoltage faults in notebook PC battery packs.
For engineers reviewing the BQ296115DSGR datasheet, BQ296115DSGR pinout, BQ296115DSGR application, or BQ296115DSGR equivalent, key selection criteria include OVP threshold tolerance, regulated output voltage and current capability, UV self-disable behavior (2.0V threshold), ultra-low quiescent current (1.2µA with REG off), and compatibility with 2-/3-/4-cell stack topologies requiring precise second-level protection.
Technical Context
The BQ296115DSGR implements independent per-cell voltage monitoring using precision analog comparators referenced to a factory-trimmed 4.25V OVP threshold with 300mV hysteresis. Upon detection of any cell exceeding VOV, a non-adjustable 6.5s internal timer initiates before asserting the active-high OUT signal to trigger external fuse-blowing circuitry.
Its integrated 2.5V regulated supply delivers up to 2mA to always-on loads (e.g., RTC), with self-disable activated when any cell falls below 2.0V (±50mV accuracy) for ≥6s. The device draws only 1.2µA when REG is disabled and maintains <100nA input leakage per sense pin.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| OVP Threshold | 4.25V ±10mV at 25°C - enables precise cell-level overvoltage cutoff without external calibration |
| OVP Delay Timer | 6.5s fixed - provides deterministic fault response time for fuse activation in battery pack safety circuits |
| Regulated Output | 2.5V ±2.5% at 0–2mA load - powers real-time clocks or low-power supervisors without external LDO |
| Supply Current (REG off) | 1.2µA max at –40°C to +110°C - minimizes standby drain on deeply discharged battery stacks |
| Input Leakage (per cell) | <100nA - preserves cell voltage balance and avoids measurement error in high-impedance sensing networks |
| UV Self-Disable Threshold | 2.0V ±50mV - prevents regulated output from discharging weak cells below safe operating voltage |
| Operating Temp Range | –40°C to +110°C - supports industrial and automotive battery pack environments |
Pinout & Package
Package: 8-pin WSON (2.00mm × 2.00mm), exposed thermal pad (PWPD) recommended to be connected to VSS.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| V1 | Sense input for lowest cell (V1–VSS) | Monitors bottom cell voltage; must be connected first during assembly to avoid REG damage |
| V2 | Sense input for second cell (V2–V1) | Enables differential monitoring of 2–4 cell stacks; unused pins shorted to adjacent lower pin |
| V3 | Sense input for third cell (V3–V2) | Supports 3-series configurations; tied to V2 if unused in 2-cell designs |
| V4 | Sense input for fourth cell (V4–V3) | Enables full 4-series support; tied to V3 if unused in 2-/3-cell packs |
| VDD | Unregulated power input (3–20V) | Accepts full stack voltage; requires RC filter for noise immunity in high-noise battery environments |
| VSS | Ground reference and cell stack negative terminal | Must be connected before other pins to prevent REG capacitor discharge damage |
| OUT | Active-high overvoltage fault signal | Drives NMOS gate to short fuse to ground; 4.5mA source capability ensures reliable FET turn-on |
| REG | 2.5V regulated output (0–2mA) | Powers RTC or supervisor ICs; includes short-circuit current limiting (4mA) and self-disable on UV |
Key Features
| Feature | Design Value |
|---|---|
| Per-cell OVP monitoring | Independent analog comparison of all 4 cell voltages against 4.25V threshold with 300mV hysteresis |
| Factory-programmed timing | Fixed 6.5s delay between OVP detection and OUT assertion - eliminates external timing components |
| Self-regulating supply | Integrated 2.5V LDO delivering 2mA with automatic disable when any cell drops below 2.0V |
| Ultra-low power operation | 1.2µA ICC with REG disabled - extends shelf life and reduces parasitic drain in storage mode |
| Robust pin protection | 2000V HBM ESD rating and absolute max ratings up to 30V on sense inputs - withstands assembly handling and field transients |
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 protector that triggers fuse blow via active-high OUT signal after 6.5s OVP delay, independent of host controller. Use Value: Prevents thermal runaway by enforcing strict 4.25V/cell limit with ±10mV accuracy, even if primary protection fails. |
Use Scenario: Enabling always-on RTC functionality while maintaining ultra-low standby current in thin-and-light platforms. IC Role / Device Role / Timing Role: Provides regulated 2.5V/2mA supply to RTC oscillator, automatically disabling when any cell falls below 2.0V. Use Value: Eliminates need for discrete LDO and UVLO circuit, reducing BOM count and PCB area in space-constrained ultrabooks. |
| Medical Portable Devices | UPS Battery Backup Systems |
Use Scenario: Safety-critical overvoltage cutoff in sealed Li-ion packs powering portable diagnostic equipment. IC Role / Device Role / Timing Role: Monitors each cell in 3-series configuration; asserts OUT to disconnect charging path upon sustained >4.25V condition. Use Value: Meets IEC 62133 requirements for redundant overvoltage protection with verified 6.5s fault response window. |
Use Scenario: Protecting lead-acid replacement Li-ion strings in line-interactive UPS units during AC overvoltage events. IC Role / Device Role / Timing Role: Detects individual cell overvoltage during fast charging; uses REG output to power backup supervisor ICs. Use Value: Ensures continuous UPS monitoring during grid anomalies by sustaining 2.5V supply even as main battery depletes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar overvoltage protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BQ296112DSGR | 4.50V OVP threshold, 3.0s delay timer, same 2.5V REG output | Better suited for fast-response systems requiring shorter fault clearance time | Select when tighter OVP margin (4.50V) and faster reaction (3s) outweigh need for extended delay headroom |
| BQ296114DSGR | 4.50V OVP threshold, 4.0s delay timer, same 2.5V REG output | Offers intermediate delay between BQ296112 and BQ296115 for balanced response/safety trade-off | Choose when 4s delay provides optimal compromise between nuisance trip avoidance and fault containment speed |
Compared with BQ296115DSGR, BQ296112DSGR enables faster fault clearing but reduces margin against transient overvoltage spikes, while BQ296114DSGR offers a middle-ground delay-both retain identical 2.5V REG output and UV self-disable behavior, ensuring drop-in compatibility in existing 2.5V-supplied designs.
Availability
BQ296115DSGR is available at Aetrix Electronics and suitable for notebook PC battery packs, ultrabook power management systems, and medical portable devices requiring stable component supply across long production lifecycles.
Supply support for BQ296115DSGR 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 company specializing in analog, embedded processing, and power management technologies, with leadership in battery management solutions.
The BQ296xxx family is designed specifically for second-level overvoltage protection in multi-cell Li-ion battery packs, integrating precision voltage monitoring, configurable delay timers, and regulated auxiliary supplies to simplify safety-critical pack design.
FAQ
What is the factory-programmed overvoltage threshold for BQ296115DSGR?
The BQ296115DSGR has a factory-programmed overvoltage threshold of 4.25V with ±10mV accuracy at 25°C and ±54mV accuracy across –40°C to +110°C. This value is laser-trimmed during manufacturing and cannot be adjusted externally. The threshold applies to each individual cell in 2-, 3-, or 4-series configurations, enabling precise per-cell protection without external resistor networks.
How does the regulated output (REG) of BQ296115DSGR behave during battery discharge?
The BQ296115DSGR's REG pin delivers a stable 2.5V output up to 2mA, but automatically disables when any monitored cell voltage falls below 2.0V for ≥6 seconds. Once disabled, REG remains off until all cells exceed 2.05V (2.0V + 50mV hysteresis). This self-disable function prevents deep discharge of weak cells and protects downstream RTC or supervisor circuits from undervoltage operation.
What is the purpose of the fixed 6.5-second delay timer in BQ296115DSGR?
The fixed 6.5-second delay timer in BQ296115DSGR provides deterministic fault response time between overvoltage detection and assertion of the active-high OUT signal. This delay allows transient voltage spikes to settle before triggering fuse-blowing circuitry, reducing false trips while ensuring rapid isolation during sustained overvoltage conditions. The timer is fully internal and requires no external components.
Can BQ296115DSGR be used in a 2-cell battery configuration?
Yes, BQ296115DSGR supports 2-, 3-, and 4-series Li-ion configurations. For 2-cell use, connect V1 to the bottom cell's positive terminal and V2 to the top cell's positive terminal; leave V3 and V4 unconnected or short V3 to V2 and V4 to V3. The device automatically ignores unused higher-voltage sense inputs and monitors only the connected cells for overvoltage and undervoltage conditions.
What are the absolute maximum ratings for the Vx sense pins on BQ296115DSGR?
The BQ296115DSGR Vx sense pins (V1–V4) have an absolute maximum rating of –0.3V to +30V differential voltage relative to the adjacent pin (e.g., V2–V1, V1–VSS). This wide range accommodates full-stack voltage transients and simplifies layout in high-voltage battery packs. Exceeding these limits may cause permanent damage, so RC filtering per TI's recommended 1kΩ/0.1µF network is required for robust operation.
BQ296115DSGR 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)
BQ296115DSGR FAQ
1.How can I place an order for BQ296115DSGR through Aetrix?
Please submit a Request for Quotation (RFQ) for BQ296115DSGR 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 BQ296115DSGR reliable?
The price and inventory of BQ296115DSGR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BQ296115DSGR is usually 5 days.
3.What payment methods are accepted for BQ296115DSGR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BQ296115DSGR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BQ296115DSGR?
BQ296115DSGR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BQ296115DSGR 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 BQ296115DSGR?
For technical support, including BQ296115DSGR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BQ296115DSGR requirements.
6.How does Aetrix verify that BQ296115DSGR is sourced from the original manufacturer or authorized distributors?
All BQ296115DSGR 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 BQ296115DSGR meets industry standards.
7.What is the process for return or replacement of BQ296115DSGR?
All BQ296115DSGR units undergo pre-shipment inspection (PSI). If there is an issue with BQ296115DSGR, 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 BQ296115DSGR part is unused and in its original packaging.
Return procedure for BQ296115DSGR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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