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Texas Instruments BQ296221DSGR
- Part No.:
- BQ296221DSGR
- Manufacturer:
- Texas Instruments
- Category:
- Battery Management
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
BQ296221DSGR.pdf
- Description:
- IC BATT PROT LI-ION 2-4CEL 8WSON
- Quantity:
- Payment:
- Shipping:
Inventory:2,970
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Product details
Overview
BQ296221DSGR 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, 3.3V 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 BQ296221DSGR datasheet, BQ296221DSGR pinout, BQ296221DSGR application, or BQ296221DSGR equivalent, this page delivers verified technical context, real-world design meaning of key specs, validated pin functions, confirmed alternative options with functional differences, and supply-chain support details specific to BQ296221DSGR.
Technical Context
The BQ296221DSGR implements independent per-cell voltage monitoring across up to four series-connected Li-ion cells using precision analog comparators referenced to a factory-trimmed 4.55V overvoltage threshold. Its internal fixed-delay timer (6.5s) initiates only upon detection of any cell exceeding VOV, ensuring controlled fault response without false triggering.
It integrates a self-disabling 3.3V regulated output delivering up to 2mA, which remains active only while all cell voltages stay above the factory-set 2.5V undervoltage threshold (VUVREG); it disables after 6s if any cell falls below that level. The OUT pin provides CMOS-active-high fault signaling with 4.5mA source capability.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| OVP Threshold | Factory-programmed 4.55V ±10mV at 25°C - enables precise cell-level overvoltage cutoff matching Li-ion chemistry limits. |
| OVP Delay Timer | Fixed 6.5s delay before OUT assertion - prevents nuisance tripping during transient voltage spikes. |
| Regulated Output | 3.3V ±30mV at 500µA load - powers RTC or low-power always-on circuitry without external LDO. |
| Supply Current (REG on) | 4–8µA over –40°C to +110°C - ensures multi-year battery pack shelf life with regulator enabled. |
| Input Leakage (per cell) | <100nA at Vx pins - minimizes parasitic discharge in high-impedance battery monitoring paths. |
| Operating Voltage Range | VDD = 3V to 20V - supports full 2S–4S Li-ion stack voltages (up to ~16.8V) with margin. |
| Package | 8-pin WSON, 2.0mm × 2.0mm - enables compact placement directly on battery pack PCBs near cell connections. |
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 clockwise.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD | Power supply input | Unregulated input tied to top of battery stack; accepts 3–20V; 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 voltage between lowest cell's (+) and VSS; requires 1kΩ/0.1µF RC filter per TI layout guidelines. |
| V2 | Cell 2 sense input | Sense voltage between second cell's (+) and V1; same RC filtering as V1; unused pins shorted downward. |
| V3 | Cell 3 sense input | Sense voltage between third cell's (+) and V2; supports 3S/4S configurations; filtered identically. |
| V4 | Cell 4 sense input | Sense voltage between fourth cell's (+) and V3; enables full 4S monitoring; filtered per spec. |
| OUT | Active-high fault output | CMOS output driving NMOS gate to short fuse to ground; 4.5mA source drive capability. |
| REG | Regulated supply output | 3.3V output (2mA max); requires 0.47µF ceramic cap to VSS; self-disables if any cell <2.5V. |
Key Features
| Feature | Design Value |
|---|---|
| Per-cell overvoltage monitoring | Independent sensing of V1–VSS, V2–V1, V3–V2, V4–V3 enables precise fault isolation in multi-cell stacks. |
| Factory-programmed OVP | 4.55V threshold with ±10mV accuracy eliminates external resistor networks and calibration effort. |
| Self-disabling regulated output | 3.3V supply automatically shuts off when any cell drops below 2.5V, preventing deep discharge damage. |
| Low quiescent current | 4µA typical supply current with REG enabled extends battery shelf life in storage or standby modes. |
| Customer Test Mode (CTM) | 15ms fast-delay test mode triggered by VDD–V4 ≥10V - reduces production test time without compromising reliability. |
Applications
| Ultrabook Battery Protection | Notebook PC Secondary Protection |
|---|---|
Use Scenario: Secondary overvoltage safeguard in slim ultrabook battery packs where primary protection resides in fuel gauge IC. IC Role / Device Role / Timing Role: Standalone OV monitor asserting fault signal to blow fuse within 6.5s of sustained >4.55V cell voltage. Use Value: Prevents thermal runaway by cutting power path before cell degradation occurs, meeting UL2054 safety requirements. |
Use Scenario: Redundant overvoltage protection layer in high-reliability notebook battery modules with dual FET control. IC Role / Device Role / Timing Role: Independent hardware-based OV detector with fixed 6.5s delay, decoupled from firmware-controlled primary protection. Use Value: Guarantees fail-safe shutdown even if host system firmware hangs or fails - critical for CE/FCC compliance. |
| Medical Portable Device Backup | UPS Battery Management System |
Use Scenario: Overvoltage guard in sealed medical battery packs powering portable diagnostic equipment with strict safety certification. IC Role / Device Role / Timing Role: Monitors all 3S cells individually; asserts active-high OUT to trigger mechanical disconnect upon OV detection. Use Value: Enables IEC 62368-1 compliant design with deterministic 6.5s fault response and no software dependency. |
Use Scenario: Secondary protection in enterprise UPS battery strings where long-term reliability and field serviceability are mandatory. IC Role / Device Role / Timing Role: Provides regulated 3.3V supply to keep RTC and communication ICs alive during AC outage, while monitoring 4S stack for overvoltage. Use Value: Maintains timekeeping and telemetry during brownouts while guaranteeing safe shutdown before cell overcharge. |
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, 3.3V REG, but UV threshold is 2.5V (identical); identical pinout and package. | No functional difference in OVP/REG behavior; differs only in factory programming of undervoltage hysteresis (not user-accessible). | Select BQ296221DSGR when exact TI-specified 2.5V UV threshold with 300mV hysteresis is required per design validation. |
| BQ296231DSGR | OVP threshold is 4.60V (50mV higher), otherwise identical timing, REG, and package; same ±10mV accuracy. | Triggers later in charge cycle - suitable for high-voltage Li-ion variants (e.g., LiCoO₂ with extended upper limit), not drop-in for 4.55V-critical designs. | Choose only if battery chemistry tolerates 4.60V/cell and system-level validation confirms safe operation at elevated voltage. |
Compared with BQ296223DSGR (functionally identical) and BQ296231DSGR (higher 4.60V OVP), BQ296221DSGR provides the precise 4.55V threshold needed for standard NMC/NCA Li-ion cells, ensuring optimal balance between safety margin and usable capacity.
Availability
BQ296221DSGR 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, long-lifecycle assurance, and TI-qualified automotive-grade reliability.
Supply support for BQ296221DSGR 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 leadership in battery management ICs.
The BQ296xxx family is designed specifically for secondary overvoltage protection in multi-cell Li-ion battery packs, delivering precision analog monitoring, integrated regulated supply, and robust fault signaling for safety-critical portable and industrial energy storage.
FAQ
What is the factory-programmed overvoltage threshold for BQ296221DSGR?
The BQ296221DSGR has a factory-programmed overvoltage protection (OVP) threshold of 4.55V with ±10mV accuracy at 25°C. This value is laser-trimmed during manufacturing and cannot be adjusted externally. It is optimized for standard NMC/NCA Li-ion cells operating up to 4.55V per cell, providing a reliable safety margin against overcharge without sacrificing usable capacity. The BQ296221DSGR maintains this specification across its full operating temperature range (–40°C to +110°C) with defined drift limits.
Does BQ296221DSGR support 2-series, 3-series, and 4-series Li-ion configurations?
Yes, BQ296221DSGR supports 2S, 3S, and 4S Li-ion battery stacks through dedicated sense inputs: V1–VSS (Cell 1), V2–V1 (Cell 2), V3–V2 (Cell 3), and V4–V3 (Cell 4). Unused higher-order pins (e.g., V4 for 2S) are shorted to the adjacent lower pin per TI's layout guidance. All four differential inputs are internally monitored simultaneously, and an overvoltage fault triggers if any single cell exceeds the 4.55V threshold - making BQ296221DSGR fully configurable across these topologies without external component changes.
What is the function and specification of the REG pin on BQ296221DSGR?
The REG pin on BQ296221DSGR delivers a factory-programmed 3.3V regulated output capable of sourcing up to 2mA. It includes built-in short-circuit current limiting (~4mA) and self-disables when any monitored cell voltage falls below the 2.5V undervoltage threshold for 6 seconds. The output requires a 0.47µF ceramic capacitor to VSS for stability and must be placed close to the IC per layout guidelines. This feature eliminates the need for an external LDO when powering RTCs or low-power supervisory circuits in battery packs.
How does the OUT pin behave during an overvoltage event on BQ296221DSGR?
The OUT pin on BQ296221DSGR is a CMOS active-high output that transitions from low to high after a fixed 6.5-second delay following detection of any cell voltage exceeding 4.55V. It sources up to 4.5mA and is intended to drive the gate of an external NMOS FET, creating a low-impedance path from fuse to ground. This allows battery or charger current to blow the fuse and isolate the pack. The output remains high until all cell voltages fall below (4.55V – 300mV hysteresis), at which point it returns low and normal monitoring resumes.
Is BQ296221DSGR pin-compatible with other BQ2962 variants like BQ296223DSGR?
Yes, BQ296221DSGR is fully pin-compatible with all BQ2962x DSGR variants, including BQ296223DSGR and BQ296231DSGR. They share identical 8-pin WSON (2mm × 2mm) packaging, pinout configuration (VDD, VSS, V1–V4, OUT, REG), electrical ratings, and functional architecture. Differences exist only in factory-programmed parameters - OVP threshold (4.55V vs. 4.55V vs. 4.60V), UV threshold (2.5V in all three), and internal hysteresis values - none of which affect physical or electrical interoperability on the PCB.
BQ296221DSGR 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)
BQ296221DSGR FAQ
1.How can I place an order for BQ296221DSGR through Aetrix?
Please submit a Request for Quotation (RFQ) for BQ296221DSGR 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 BQ296221DSGR reliable?
The price and inventory of BQ296221DSGR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BQ296221DSGR is usually 5 days.
3.What payment methods are accepted for BQ296221DSGR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BQ296221DSGR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BQ296221DSGR?
BQ296221DSGR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BQ296221DSGR 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 BQ296221DSGR?
For technical support, including BQ296221DSGR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BQ296221DSGR requirements.
6.How does Aetrix verify that BQ296221DSGR is sourced from the original manufacturer or authorized distributors?
All BQ296221DSGR 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 BQ296221DSGR meets industry standards.
7.What is the process for return or replacement of BQ296221DSGR?
All BQ296221DSGR units undergo pre-shipment inspection (PSI). If there is an issue with BQ296221DSGR, 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 BQ296221DSGR part is unused and in its original packaging.
Return procedure for BQ296221DSGR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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