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Texas Instruments BQ296228DSGR
- Part No.:
- BQ296228DSGR
- Manufacturer:
- Texas Instruments
- Category:
- Battery Management
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
BQ296228DSGR.pdf
- Description:
- IC BATT PROT LI-ION 2-4CEL 8WSON
- Quantity:
- Payment:
- Shipping:
Inventory:3,000
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Product details
Overview
BQ296228DSGR 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, ±10mV OVP accuracy, 3.0V regulated output (2mA max), and <100nA per-cell input leakage. It serves as second-level protection in notebook PC battery management systems.
For engineers reviewing the BQ296228DSGR datasheet, BQ296228DSGR pinout, BQ296228DSGR application, or BQ296228DSGR equivalent, this page delivers verified technical context, real-world implementation constraints, validated alternative options, and supply-chain support details specific to the BQ296228DSGR variant.
Technical Context
The BQ296228DSGR independently monitors each cell voltage (V1–V4) against a factory-trimmed 4.55V overvoltage threshold with 300mV hysteresis and ±10mV accuracy at 25°C. Upon detection, it initiates a precise 6.5s internal delay before asserting the active-high OUT signal to trigger external FET-based fuse blow.
Its 3.0V regulated output (REG) delivers up to 2mA with self-disable logic: REG shuts down if any cell falls below the factory-set 2.5V undervoltage threshold for 6s, preventing battery drain. Supply current is 4µA (REG on) or 1.2µA (REG off) under normal operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| OVP Threshold | 4.55V ±10mV at 25°C - enables precise cell voltage clamping without external calibration |
| OVP Delay Timer | 6.5s fixed (±20%) - provides deterministic fault response time for fuse-blow coordination |
| Regulated Output | 3.0V ±30mV @ 0–2mA - powers RTC or always-on circuitry with stable low-noise supply |
| Supply Current | 4µA (REG enabled) / 1.2µA (REG disabled) - extends battery shelf life during storage |
| Cell Input Leakage | <100nA per Vx pin - minimizes imbalance drift in multi-cell stacks over time |
| Operating Temp | –40°C to +110°C - supports industrial and automotive battery pack environments |
| Package | 8-pin WSON (2mm × 2mm) - enables compact placement adjacent to 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 cell 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 bottommost cell (V1–VSS); requires 1kΩ/0.1µF RC filter |
| V2 | Cell 2 sense input | Sense positive terminal of second cell (V2–V1); same RC filter requirements as V1 |
| V3 | Cell 3 sense input | Sense positive terminal of third cell (V3–V2); used in 3- and 4-series configurations |
| V4 | Cell 4 sense input | Sense positive terminal of topmost cell (V4–V3); unused in 2- or 3-series designs |
| OUT | Overvoltage fault output | CMOS active-high signal; drives NMOS gate to short fuse to ground upon OVP event |
| REG | Regulated supply output | 3.0V output (2mA max); requires 0.47µF ceramic capacitor to VSS; self-disables below 2.5V cell voltage |
Key Features
| Feature | Design Value |
|---|---|
| Factory-programmed OVP | 4.55V threshold with ±10mV accuracy eliminates need for external resistor dividers or trimming |
| Fixed 6.5s OVP delay | Deterministic timing ensures consistent fuse-blow behavior across production units and temperature |
| Self-disabling 3.0V regulator | Automatically disables REG when any cell drops below 2.5V, preventing deep discharge damage |
| Ultra-low quiescent current | 1.2µA supply current with REG off enables >10-year shelf-life in battery backup applications |
| Per-cell leakage <100nA | Minimizes inter-cell voltage drift during long-term storage, preserving pack balance |
Applications
| Ultrabook Battery Protection | Notebook PC Secondary Protection |
|---|---|
Use Scenario: Secondary overvoltage safeguard in slim-profile ultrabook battery packs where primary protection resides in the fuel gauge IC. IC Role / Device Role / Timing Role: Second-level OVP monitor that triggers fuse blow only after sustained 4.55V cell voltage for 6.5s, avoiding false trips from transient spikes. Use Value: Prevents thermal runaway by ensuring fuse activation occurs only after confirmed overcharge condition, extending pack safety margin. |
Use Scenario: Standalone OVP supervisor in cost-optimized notebook battery modules lacking integrated protection. IC Role / Device Role / Timing Role: Primary overvoltage detector with active-high OUT driving external NMOS to short fuse; 3.0V REG powers embedded microcontroller. Use Value: Enables single-chip secondary protection with regulated supply-reducing BOM count vs. discrete regulator + comparator solutions. |
| Medical Portable Device Backup | UPS Battery Management |
Use Scenario: Safety-critical overvoltage guard in rechargeable medical instruments requiring IEC 62368-1 compliance. IC Role / Device Role / Timing Role: Independent hardware-level OVP checker operating outside main system MCU control path; 6.5s delay aligns with medical charge termination protocols. Use Value: Provides fail-safe, analog-based protection independent of firmware-meeting functional safety requirements for Class II devices. |
Use Scenario: Overvoltage supervision in line-interactive UPS battery strings where charger regulation may drift during grid anomalies. IC Role / Device Role / Timing Role: Monitors individual cell voltages in 4-series Li-ion string; REG powers UPS controller's RTC and non-volatile memory during brownout. Use Value: Maintains timekeeping and state retention during extended outages while guaranteeing cell-level OVP enforcement. |
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 4.55V OVP, 6.5s delay, but 3.3V REG output instead of 3.0V | Requires redesign of downstream 3.0V circuitry; suitable when higher REG voltage improves RTC stability | Select if system load tolerates 3.3V and benefits from tighter REG tolerance (±2% vs. ±3% at 2mA) |
| BQ296231DSGR | 4.60V OVP threshold (50mV higher), identical 6.5s delay and 3.0V REG | Allows higher charge termination voltage; increases risk of premature OVP trip in aging cells with voltage spread | Choose for newer, well-matched cell stacks where 4.60V reflects updated chemistry limits |
Compared with BQ296228DSGR, BQ296223DSGR shifts regulated output to 3.3V-requiring voltage translation for 3.0V loads-while BQ296231DSGR raises OVP to 4.60V, trading tighter cell utilization for reduced margin against overcharge-induced degradation.
Availability
BQ296228DSGR is available at Aetrix Electronics and suitable for notebook PC battery protection, ultrabook secondary safety systems, and medical portable device backup requiring stable component supply with guaranteed long-term lifecycle support.
Supply support for BQ296228DSGR 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 50 years of innovation in battery management solutions.
The BQ296xxx family was designed specifically for high-accuracy, ultra-low-power secondary overvoltage protection in multi-cell Li-ion battery packs-targeting applications where reliability, longevity, and minimal standby current are critical.
FAQ
What is the exact overvoltage protection threshold and accuracy of the BQ296228DSGR?
The BQ296228DSGR 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 precision eliminates need for external calibration and ensures consistent cell voltage clamping in demanding thermal environments.
How does the BQ296228DSGR regulate its 3.0V output and what is its maximum load capability?
The BQ296228DSGR delivers a regulated 3.0V output (±30mV at 2mA) capable of sourcing up to 2mA continuously. It incorporates short-circuit current limiting (4mA typical) and automatically disables the REG output if any monitored cell voltage falls below 2.5V for 6 seconds-preventing battery drain during deep discharge.
What is the function of the OUT pin on the BQ296228DSGR and how is it driven?
The OUT pin on the BQ296228DSGR is a CMOS active-high output that transitions to logic high after a precise 6.5s delay upon detection of any cell exceeding 4.55V. It directly drives the gate of an external NMOS FET to short the fuse to ground, enabling battery or charger current to blow the fuse and interrupt the power path.
Does the BQ296228DSGR support 2-cell, 3-cell, and 4-cell battery configurations-and how are unused pins handled?
Yes, the BQ296228DSGR supports 2-, 3-, and 4-series Li-ion configurations. Unused Vx pins (e.g., V4 in a 2-cell pack) must be shorted to the adjacent lower pin (V3 → V2 → V1 → VSS) to maintain proper biasing and avoid floating inputs that could cause erroneous OVP detection or increased leakage.
What are the absolute maximum ratings and recommended operating conditions for the BQ296228DSGR?
The BQ296228DSGR has absolute maximum ratings of –0.3V to 30V on VDD–VSS and –0.3V to 3.6V on REG–VSS. Recommended operating conditions specify VDD = 3–20V, cell differential voltage = 0–5V, and ambient temperature = –40°C to +110°C-enabling robust deployment in industrial and automotive battery systems.
BQ296228DSGR 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)
BQ296228DSGR FAQ
1.How can I place an order for BQ296228DSGR through Aetrix?
Please submit a Request for Quotation (RFQ) for BQ296228DSGR 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 BQ296228DSGR reliable?
The price and inventory of BQ296228DSGR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BQ296228DSGR is usually 5 days.
3.What payment methods are accepted for BQ296228DSGR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BQ296228DSGR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BQ296228DSGR?
BQ296228DSGR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BQ296228DSGR 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 BQ296228DSGR?
For technical support, including BQ296228DSGR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BQ296228DSGR requirements.
6.How does Aetrix verify that BQ296228DSGR is sourced from the original manufacturer or authorized distributors?
All BQ296228DSGR 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 BQ296228DSGR meets industry standards.
7.What is the process for return or replacement of BQ296228DSGR?
All BQ296228DSGR units undergo pre-shipment inspection (PSI). If there is an issue with BQ296228DSGR, 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 BQ296228DSGR part is unused and in its original packaging.
Return procedure for BQ296228DSGR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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