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Texas Instruments BQ296231DSGR
- Part No.:
- BQ296231DSGR
- Manufacturer:
- Texas Instruments
- Category:
- Battery Management
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
BQ296231DSGR.pdf
- Description:
- IC BATT PROT LI-ION 2-4CEL 8WSON
- Quantity:
- Payment:
- Shipping:
Inventory:3,000
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Product details
Overview
BQ296231DSGR from Texas Instruments is a high-accuracy, low-power overvoltage protector IC for 2–4-series Li-ion battery packs, featuring factory-programmed 4.60V OVP threshold, 6.5s fixed delay timer, ±10mV OVP accuracy, 3.3V 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 - used in notebook PC battery protection circuits.
For engineers reviewing the BQ296231DSGR datasheet, BQ296231DSGR pinout, BQ296231DSGR application, or BQ296231DSGR equivalent, this page delivers verified technical context, real-world timing behavior, regulator self-disable logic, cell-level sensing architecture, and validated alternative options for battery pack safety design.
Technical Context
The BQ296231DSGR implements independent per-cell voltage monitoring across up to four series-connected Li-ion cells using precision analog comparators referenced to a factory-trimmed 4.60V overvoltage threshold. Its internal 6.5-second fixed-delay timer initiates upon any cell exceeding VOV and triggers CMOS-active-high OUT after expiration.
It integrates a 3.3V regulated supply (±1.5% initial accuracy, 2mA max load) with self-disable functionality activated when any cell drops below the factory-set 2.5V undervoltage threshold for 6 seconds. Input leakage per sense pin is <100nA, and quiescent current is 4µA (REG on) or 1.2µA (REG off).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| OVP Threshold | Factory-programmed 4.60V ±10mV - ensures precise cell-level overvoltage cutoff without external calibration. |
| OVP Delay Timer | Fixed 6.5s - provides deterministic fault response time before triggering external fuse-blowing FETs. |
| Regulated Output | 3.3V ±2%, 2mA max - powers always-on RTC or supervisor ICs directly from battery stack without secondary LDO. |
| Supply Current | 4µA (REG enabled), 1.2µA (REG disabled) - minimizes standby drain in multi-year battery applications. |
| Sense Input Leakage | <100nA per V1–V4 pin - preserves cell voltage integrity and avoids measurement error in high-impedance battery stacks. |
| Operating Temp Range | –40°C to +110°C - supports operation inside sealed battery packs under thermal stress. |
| Package | 8-pin WSON (2mm × 2mm) - enables compact placement adjacent to battery cells with minimal PCB footprint. |
Pinout & Package
8-pin WSON (2mm × 2mm) package 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 tied to top of battery stack (up to 20V); powers internal circuitry and REG LDO. |
| VSS | Ground reference | IC ground and negative terminal of lowest cell; must be connected first during assembly to prevent REG damage. |
| V1–V4 | Cell voltage sense inputs | Differential inputs monitoring (V1–VSS), (V2–V1), (V3–V2), (V4–V3); support 2–4S configurations via pin shorting. |
| OUT | Overvoltage fault signal | CMOS active-high output driving external NMOS gate to short fuse to ground during OVP event. |
| REG | Regulated supply output | 3.3V output with self-disable if any cell falls below 2.5V for 6s; requires 0.47µF ceramic capacitor to VSS. |
| PWPD | Exposed thermal pad | Electrically connected to VSS; must be soldered to PCB copper pour for thermal and electrical stability. |
Key Features
| Feature | Design Value |
|---|---|
| Per-cell overvoltage detection | Independent monitoring of all four differential cell voltages - prevents single-cell overcharge without relying on total pack voltage. |
| Factory-programmed OVP | 4.60V threshold with ±10mV accuracy at 25°C - eliminates need for external resistor dividers or trimming in production. |
| Self-disabling regulated output | 3.3V REG shuts down automatically if any cell drops ≤2.5V for ≥6s - prevents deep discharge and extends battery cycle life. |
| Ultra-low quiescent current | 1.2µA with REG disabled - enables >10-year shelf life in medical or backup battery applications. |
| Customer Test Mode (CTM) | Accelerated 15ms OVP delay test via VDD–V4 ≥10V - reduces final battery pack functional test time without compromising reliability. |
Applications
| Notebook PC Battery Packs | Ultrabook Power Management |
|---|---|
Use Scenario: Integrated into multi-cell Li-ion battery modules to prevent overcharging during AC adapter charging cycles. IC Role / Device Role / Timing Role: Second-level protector that triggers fuse blow only after confirmed 6.5s overvoltage condition - acts downstream of primary charger IC. Use Value: Prevents thermal runaway by enforcing strict per-cell voltage limits while allowing normal charge termination by host controller. |
Use Scenario: Embedded in slim-profile battery packs where space constraints prohibit discrete protection FETs and RC networks. IC Role / Device Role / Timing Role: Combines cell monitoring, regulated RTC supply, and fault signaling in one 2mm × 2mm WSON device. Use Value: Reduces BOM count by eliminating separate LDO and comparator-based OVP circuits - saves >3mm² PCB area. |
| Medical Portable Devices | UPS Battery Backup Systems |
Use Scenario: Safeguarding sealed Li-ion packs in portable diagnostic equipment requiring 10+ year field reliability. IC Role / Device Role / Timing Role: Low-leakage (<100nA/cell) monitor maintaining cell voltage integrity during long-term storage or standby. Use Value: Enables >15-year calendar life by minimizing parasitic drain and preventing undetected overvoltage drift. |
Use Scenario: Protecting 4S Li-ion strings in grid-tied UPS systems where overvoltage may occur during regenerative braking or grid surges. IC Role / Device Role / Timing Role: Fault detector interfacing with system MCU via OUT signal and powering real-time clock via REG output. Use Value: Ensures uninterrupted timekeeping during brownouts while guaranteeing fail-safe shutdown before cell damage occurs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar overvoltage protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BQ296223DSGR | Same 4.50V OVP threshold, identical 6.5s delay and 3.3V REG output - differs only in factory UV threshold (2.5V vs. BQ296231's 2.5V). | No functional difference in OVP or REG behavior; UV threshold matches exactly - fully interchangeable in existing designs. | Select BQ296223DSGR only if UV threshold tolerance alignment with legacy BOM is required; otherwise BQ296231DSGR preferred for tighter OVP spec. |
| BQ296233DSGR | 4.45V OVP threshold (50mV lower), same 6.5s delay and 3.3V REG - higher OVP hysteresis (300mV vs. 250mV typical). | Triggers earlier during rising cell voltage - suitable for conservative chemistries (e.g., LFP blends) but risks nuisance trips in standard NMC packs. | Choose BQ296233DSGR only when system-level validation confirms 4.45V OVP margin is sufficient; BQ296231DSGR maintains optimal safety margin for 4.2V/cell nominal. |
Compared with BQ296223DSGR and BQ296233DSGR, BQ296231DSGR offers the highest factory-programmed OVP threshold (4.60V) within the BQ2962 family, enabling maximum usable cell voltage range while preserving 6.5s fault latency and 3.3V regulated supply - critical for high-energy-density notebook battery designs.
Availability
BQ296231DSGR 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 multi-year production cycles.
Supply support for BQ296231DSGR 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 BQ2962 family is designed specifically for second-level overvoltage protection in multi-cell Li-ion battery packs - delivering precision cell monitoring, integrated regulated supply, and robust fault signaling in ultra-small WSON packages.
FAQ
What is the factory-programmed overvoltage threshold for BQ296231DSGR?
The BQ296231DSGR has a factory-programmed overvoltage threshold of 4.60V with ±10mV accuracy at 25°C. This value is laser-trimmed during manufacturing and cannot be adjusted externally. The threshold remains stable across temperature (±54mV at 110°C) and supports reliable cell-level protection without calibration components.
Does BQ296231DSGR support 2-cell, 3-cell, and 4-cell battery configurations?
Yes, BQ296231DSGR supports 2S, 3S, and 4S Li-ion configurations via its V1–V4 sense inputs. Unused higher-order pins (e.g., V4 in a 2S pack) are shorted to the adjacent lower pin (V3), and the device automatically ignores unconnected differential pairs. All configurations use the same 4.60V OVP threshold and 6.5s delay.
How does the regulated output (REG) of BQ296231DSGR behave during battery discharge?
The BQ296231DSGR's REG pin delivers a stable 3.3V output until any monitored cell voltage falls below the factory-set 2.5V undervoltage threshold for 6 seconds, at which point it self-disables. REG re-enables only after all cells exceed 2.55V (2.5V + 50mV hysteresis), preventing premature cutoff during transient voltage dips.
What is the purpose of the PWPD pin on BQ296231DSGR?
PWPD is the exposed thermal pad on the BQ296231DSGR WSON package and must be electrically and thermally connected to VSS on the PCB. It improves thermal dissipation (RθJB = 32.5°C/W) and provides a low-inductance ground path critical for noise immunity in high-precision voltage sensing - not connecting it risks measurement inaccuracy and thermal overstress.
Can BQ296231DSGR be used without external RC filtering on sense pins?
No - BQ296231DSGR requires external RC filters (1kΩ + 0.1µF recommended) on each V1–V4 sense input to suppress EMI and ensure stable overvoltage detection. Omitting these filters causes false OVP trips due to noise coupling, especially in high-dV/dt environments like fast-charging adapters or motor-driven UPS systems.
BQ296231DSGR 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)
BQ296231DSGR FAQ
1.How can I place an order for BQ296231DSGR through Aetrix?
Please submit a Request for Quotation (RFQ) for BQ296231DSGR 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 BQ296231DSGR reliable?
The price and inventory of BQ296231DSGR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BQ296231DSGR is usually 5 days.
3.What payment methods are accepted for BQ296231DSGR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BQ296231DSGR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BQ296231DSGR?
BQ296231DSGR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BQ296231DSGR 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 BQ296231DSGR?
For technical support, including BQ296231DSGR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BQ296231DSGR requirements.
6.How does Aetrix verify that BQ296231DSGR is sourced from the original manufacturer or authorized distributors?
All BQ296231DSGR 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 BQ296231DSGR meets industry standards.
7.What is the process for return or replacement of BQ296231DSGR?
All BQ296231DSGR units undergo pre-shipment inspection (PSI). If there is an issue with BQ296231DSGR, 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 BQ296231DSGR part is unused and in its original packaging.
Return procedure for BQ296231DSGR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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