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Texas Instruments BQ296226DSGR
- Part No.:
- BQ296226DSGR
- Manufacturer:
- Texas Instruments
- Category:
- Battery Management
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
BQ296226DSGR.pdf
- Description:
- IC BATT PROT LI-ION 2-4CEL 8WSON
- Quantity:
- Payment:
- Shipping:
Inventory:2,419
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Product details
Overview
BQ296226DSGR from Texas Instruments is a high-accuracy, low-power overvoltage protector IC for 2–4 series Li-ion battery packs, featuring factory-programmed 4.50V OVP threshold, 6.5s fixed delay timer, ±10mV OVP accuracy, 3.3V regulated output (2mA max), and 2.8V undervoltage self-disable threshold - used to safeguard notebook PC battery packs against cell overvoltage while powering RTC circuits.
For engineers reviewing the BQ296226DSGR datasheet, BQ296226DSGR pinout, BQ296226DSGR application, or BQ296226DSGR equivalent, this page delivers verified technical context, exact pin functions, real-world implementation constraints, and validated alternative options for battery protection system design.
Technical Context
The BQ296226DSGR independently monitors each cell voltage (V1–VSS to V4–V3) using precision analog comparators referenced to a factory-trimmed 4.50V overvoltage threshold with 300mV hysteresis. Upon detection, it initiates a non-adjustable 6.5s internal delay before asserting the active-high OUT signal to trigger external FET-based fuse blow circuitry.
Its integrated 3.3V regulated supply delivers up to 2mA with ±30mV load regulation (0–2mA), self-disables when any cell drops below 2.8V for 6s, and draws only 1.2µA quiescent current when disabled - enabling always-on RTC support without compromising pack longevity.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| OVP Threshold | Factory-programmed 4.50V ±10mV at 25°C - ensures precise cell-level overvoltage cutoff within Li-ion safe operating limits. |
| OVP Delay Timer | Fixed 6.5s delay (5.2–7.8s over –40°C to +110°C) - provides controlled fault response window before fuse activation. |
| Regulated Output | 3.3V ±30mV at 0–2mA load - powers RTC or low-power logic without external LDO, eliminating board space and BOM cost. |
| Quiescent Current | 4µA with REG enabled, 1.2µA with REG disabled - extends shelf life and minimizes standby drain in battery-backed systems. |
| Input Leakage | <100nA per cell sense input - prevents measurement error and avoids parasitic discharge across high-impedance cell stacks. |
| Operating Temp | –40°C to +110°C ambient - supports operation in demanding environments including ultrabook thermal zones and medical battery enclosures. |
| UV Self-Disable | Triggers at 2.8V ±50mV with 6s delay - automatically shuts off regulated output to prevent deep discharge damage during pack idle states. |
Pinout & Package
Package: 8-pin WSON (2mm × 2mm), thermally enhanced with exposed pad connected to VSS.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD | Power supply input | Unregulated input (3–20V); must be connected first during assembly to avoid REG pin stress. |
| VSS | Ground reference | IC ground and negative terminal of lowest cell; exposed pad must be soldered to PCB ground plane. |
| V1–V4 | Cell voltage sense inputs | Differential inputs monitoring (V1–VSS), (V2–V1), (V3–V2), (V4–V3); unused pins shorted to adjacent lower pin in 2-/3-series configs. |
| OUT | Overvoltage fault output | CMOS active-high signal (0.4V low / VDD–0.3V high); drives NMOS gate to short fuse to ground during OVP event. |
| REG | Regulated supply output | 3.3V output (0–2mA); requires 0.47µF ceramic capacitor to VSS placed <2mm from pin; self-disables if any cell <2.8V. |
Key Features
| Feature | Design Value |
|---|---|
| Factory-programmed OVP | 4.50V threshold with ±10mV accuracy at 25°C - eliminates external resistor network and calibration effort. |
| Fixed-delay OV response | 6.5s internal timer (5.2–7.8s over full temp range) - ensures consistent fuse-blow timing without software or external RC timing components. |
| Self-disabling 3.3V regulator | Turns off automatically when any cell falls below 2.8V for 6s - prevents battery depletion during storage or low-power sleep modes. |
| Ultra-low leakage sensing | <100nA per Vx input - maintains cell voltage integrity in high-impedance 4-series stacks and avoids false UV/OV trips. |
| Thermally optimized package | 2mm × 2mm WSON with RθJB = 32.5°C/W - enables compact placement near battery cells while sustaining 110°C junction temperature. |
Applications
| Notebook PC Battery Protection | Ultrabook Power Management |
|---|---|
Use Scenario: Monitors 3-series Li-ion pack in thin-profile notebook; triggers fuse blow on single-cell overvoltage during fast charging. IC Role / Device Role / Timing Role: Second-level hardware OVP supervisor with 6.5s delay and 3.3V RTC supply - operates independently of host MCU. Use Value: Prevents thermal runaway by cutting power before cell voltage exceeds 4.50V, while maintaining RTC timekeeping during charge/discharge cycles. |
Use Scenario: Integrated into slim ultrabook battery pack with tight thermal constraints and requirement for zero-power RTC retention. IC Role / Device Role / Timing Role: Standalone overvoltage guard with self-disabling 3.3V regulator - activates only when all cells remain above 2.8V. Use Value: Eliminates need for discrete LDO and voltage monitor ICs, reducing component count and PCB area in space-constrained designs. |
| Medical Portable Device Backup | UPS Battery Monitoring |
Use Scenario: Secures Li-ion backup battery in portable ECG monitor; must operate reliably across –20°C to +60°C clinical environments. IC Role / Device Role / Timing Role: Precision OVP detector with ±10mV threshold accuracy and 110°C max operating temperature - immune to ambient drift. Use Value: Guarantees compliance with IEC 62133 safety requirements by enforcing strict 4.50V cell voltage ceiling under all conditions. |
Use Scenario: Protects 4-series UPS battery bank during grid-charging; detects overvoltage on any cell before charger IC responds. IC Role / Device Role / Timing Role: Hardware-fail-safe OVP layer with independent 6.5s timer - acts as final barrier even if primary charger controller fails. Use Value: Adds deterministic, non-software-dependent protection that prevents catastrophic cell venting during AC charger malfunction. |
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, 6.5s delay, 3.3V REG, but 2.5V UV self-disable threshold instead of 2.8V | Enables earlier regulator shutdown in low-voltage recovery scenarios; less margin before deep discharge | Select when tighter UV cutoff is required for high-impedance loads or extended storage. |
| BQ296231DSGR | Same 4.50V OVP and 6.5s delay, but 4.60V OVP option - not applicable; actual variant has 4.60V OVP, 6.5s delay, 3.3V REG, 2.5V UV | Higher OVP threshold allows greater charge termination voltage tolerance; reduces false trips during transient spikes | Choose for applications where charger voltage ripple exceeds ±10mV and 4.50V is marginal. |
Compared with BQ296226DSGR, BQ296223DSGR offers earlier regulated output disable (2.5V vs. 2.8V), while BQ296231DSGR trades higher OVP tolerance (4.60V) for identical UV behavior - both require layout verification due to identical WSON-8 footprint but distinct factory programming.
Availability
BQ296226DSGR is available at Aetrix Electronics and suitable for notebook PC battery protection, ultrabook power management, and medical portable device backup requiring stable component supply across extended production lifecycles.
Supply support for BQ296226DSGR 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 delivering analog and embedded processing solutions, with over 50 years of innovation in power management and battery protection ICs.
The BQ296xxx family is designed specifically for second-level hardware overvoltage protection in multi-cell Li-ion battery packs, integrating precision sensing, regulated supply, and fail-safe fault signaling in ultra-small WSON packages.
FAQ
What is the factory-programmed overvoltage threshold for BQ296226DSGR?
The BQ296226DSGR has a factory-programmed overvoltage threshold of exactly 4.50V with ±10mV accuracy at 25°C, confirmed in TI's official device comparison table and electrical characteristics section. This value is laser-trimmed during manufacturing and cannot be adjusted externally. The BQ296226DSGR maintains this specification across its full operating temperature range of –40°C to +110°C, with worst-case drift of ±54mV at 110°C.
Does BQ296226DSGR support 2-series, 3-series, and 4-series Li-ion configurations?
Yes, BQ296226DSGR supports 2-, 3-, and 4-series Li-ion battery stacks via dedicated V1–V4 sense inputs. Unused inputs (e.g., V4 in a 2-series pack) must be shorted to the adjacent lower pin (V3), as specified in Section 8.2.2 of the datasheet. The device monitors differential voltages (V1–VSS), (V2–V1), (V3–V2), and (V4–V3) independently and triggers OVP if any exceeds 4.50V.
What is the regulated output voltage and maximum load capability of BQ296226DSGR?
The BQ296226DSGR provides a factory-programmed 3.3V regulated output (VREG) with ±30mV regulation over 0–2mA load and ±3.3mV line regulation. It delivers up to 2mA continuously, includes short-circuit current limiting (4mA typical), and self-disables when any cell voltage falls below 2.8V for 6 seconds - ensuring safe RTC or low-power logic operation without external regulators.
How does the overvoltage fault response timing work on BQ296226DSGR?
BQ296226DSGR uses a fixed internal delay timer of 6.5 seconds (5.2–7.8s over –40°C to +110°C) after detecting any cell voltage exceeding 4.50V. During this period, the OUT pin remains low; upon timer expiration, OUT asserts high (VDD–0.3V) to drive an external NMOS FET and initiate fuse blow. The device returns to normal operation only after all cell voltages fall below 4.20V (4.50V – 300mV hysteresis).
What package type and thermal characteristics does BQ296226DSGR use?
BQ296226DSGR uses an 8-pin WSON package (2.00mm × 2.00mm) with exposed thermal pad. Its thermal resistance is RθJB = 32.5°C/W (junction-to-board), enabling reliable operation at 110°C ambient. The datasheet mandates soldering the exposed pad to the PCB ground plane for thermal and electrical performance - failure to do so degrades thermal dissipation and may cause premature device failure.
BQ296226DSGR 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)
BQ296226DSGR FAQ
1.How can I place an order for BQ296226DSGR through Aetrix?
Please submit a Request for Quotation (RFQ) for BQ296226DSGR 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 BQ296226DSGR reliable?
The price and inventory of BQ296226DSGR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BQ296226DSGR is usually 5 days.
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Once your BQ296226DSGR 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 BQ296226DSGR?
For technical support, including BQ296226DSGR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BQ296226DSGR requirements.
6.How does Aetrix verify that BQ296226DSGR is sourced from the original manufacturer or authorized distributors?
All BQ296226DSGR 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 BQ296226DSGR meets industry standards.
7.What is the process for return or replacement of BQ296226DSGR?
All BQ296226DSGR units undergo pre-shipment inspection (PSI). If there is an issue with BQ296226DSGR, 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 BQ296226DSGR part is unused and in its original packaging.
Return procedure for BQ296226DSGR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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