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Texas Instruments BQ296111DSGT
- Part No.:
- BQ296111DSGT
- Manufacturer:
- Texas Instruments
- Category:
- Battery Management
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
BQ296111DSGT.pdf
- Description:
- IC BATT PROT LI-ION 2-4CEL 8WSON
- Quantity:
- Payment:
- Shipping:
Inventory:956
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Product details
Overview
BQ296111DSGT from Texas Instruments is a high-accuracy, low-power overvoltage protector IC for 2- to 4-series Li-ion battery packs, featuring factory-programmed 4.45V OVP threshold, 4-second fixed delay timer, ±10mV OVP accuracy, 3.3V regulated output (2mA max), and 8-pin WSON (2mm × 2mm) package - used in notebook PC battery protection circuits to prevent cell overcharge and power RTCs during standby.
For engineers reviewing the BQ296111DSGT datasheet, BQ296111DSGT pinout, BQ296111DSGT application, or BQ296111DSGT equivalent, this page delivers verified technical context, real-world design meaning of key specs, validated pin functions, confirmed alternative options, and supply support details specific to BQ296111DSGT - not generic BQ296xxx family data.
Technical Context
The BQ296111DSGT independently monitors each cell voltage (V1–VSS, V2–V1, V3–V2, V4–V3) against a factory-set 4.45V overvoltage threshold with 300mV hysteresis and ±10mV accuracy at 25°C. Upon detection, it initiates a precise 4-second internal delay before asserting the active-high OUT signal to trigger external FETs for fuse blow.
Its integrated 3.3V regulated output delivers up to 2mA to always-on loads (e.g., RTC), self-disables when any cell drops below 2.5V (factory-configured UV threshold), and draws only 4µA quiescent current when enabled - enabling ultra-low-power battery pack monitoring across –40°C to +110°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| OVP Threshold | 4.45V ±10mV at 25°C - ensures precise cell overcharge cutoff without premature tripping in multi-cell stacks. |
| OVP Delay Timer | 4.0s ±0.8s - provides deterministic fault response window before FET activation, balancing safety and transient immunity. |
| Regulated Output | 3.3V ±30mV at 500µA load - powers RTC or supervisor ICs with stable voltage, eliminating need for external LDO. |
| Quiescent Current | 4µA (REG on), 1.2µA (REG off) - extends battery shelf life and reduces parasitic drain in storage mode. |
| Cell Input Leakage | <100nA per sense pin - minimizes measurement error and prevents cell imbalance in high-impedance monitoring networks. |
| Operating Temp | –40°C to +110°C - supports operation in thermally demanding laptop battery packs and medical backup systems. |
| Package | 8-pin WSON, 2.0mm × 2.0mm - enables compact placement on space-constrained battery management PCBs. |
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 |
|---|---|---|
| VDD | Power supply input | Unregulated input (3–20V); powers internal circuitry and REG output; requires RC filter for noise immunity. |
| VSS | Ground reference | IC ground and negative terminal of lowest cell; must be connected first during assembly to avoid REG damage. |
| V1 | Cell 1 sense input | Sense positive voltage of bottom cell (V1–VSS); requires 1kΩ/0.1µF RC filter for stable monitoring. |
| V2 | Cell 2 sense input | Sense positive voltage of second cell (V2–V1); identical filtering and layout requirements as V1. |
| V3 | Cell 3 sense input | Sense positive voltage of third cell (V3–V2); unused pins in 2- or 3-cell configs must be shorted to adjacent Vx. |
| V4 | Cell 4 sense input | Sense positive voltage of top cell (V4–V3); required only in 4-series configurations; same RC filter spec. |
| OUT | Overvoltage fault output | CMOS active-high signal (0V/7V swing); drives NMOS gate to short fuse to ground upon OVP detection. |
| REG | Regulated supply output | 3.3V output (0–2mA); requires 0.47µF ceramic cap to VSS near pin; self-disables if any cell <2.5V. |
Key Features
| Feature | Design Value |
|---|---|
| Factory-programmed OVP | 4.45V threshold with ±10mV accuracy at 25°C - eliminates external resistor programming and calibration effort. |
| Fixed 4s OVP delay | Deterministic 4.0s ±0.8s timing - avoids software-based delays and ensures consistent fuse-blow behavior across units. |
| Self-disabling REG output | Turns off automatically when any cell falls below 2.5V - prevents deep discharge and preserves battery health. |
| Ultra-low leakage inputs | <100nA per Vx pin - maintains cell voltage balance and avoids false OVP/UV triggers in high-Z sensing networks. |
| Integrated 3.3V regulator | 2mA output with ±30mV regulation - powers RTC or microcontroller reset circuitry without external regulators. |
Applications
| Notebook PC Battery Pack | Ultrabook Power Management |
|---|---|
Use Scenario: Monitors 3-series Li-ion cells during charging to prevent overvoltage-induced thermal runaway. IC Role / Device Role / Timing Role: Second-level hardware OVP protector; asserts active-high OUT after 4s delay to trigger fuse blow via external NMOS. Use Value: Enables compliance with UL 2054/IEC 62133 by providing deterministic, analog-based overvoltage cutoff independent of host MCU. |
Use Scenario: Powers real-time clock and system supervisor during sleep mode while monitoring cell voltages. IC Role / Device Role / Timing Role: Dual-function device: OVP monitor + 3.3V regulated supply source; REG self-disables if cell drops below 2.5V. Use Value: Reduces BOM count by integrating RTC power and protection in one 2mm × 2mm WSON package. |
| Medical Portable Device | UPS Battery Backup |
Use Scenario: Ensures safe operation of sealed Li-ion packs in portable diagnostic equipment with long shelf life. IC Role / Device Role / Timing Role: Low-power protector (4µA ICC) with self-disable logic - maintains pack integrity during 5+ year storage. Use Value: Prevents irreversible capacity loss by cutting off loads before deep discharge, extending usable service life. |
Use Scenario: Protects 4-series backup batteries in telecom UPS systems where reliability and temperature range are critical. IC Role / Device Role / Timing Role: High-accuracy OVP (±10mV) with extended temp range (–40°C to +110°C) for harsh environments. Use Value: Guarantees fail-safe shutdown before cell venting, meeting IEC 62368-1 functional safety requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar overvoltage protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BQ296112DSGT | 4.50V OVP threshold, 3.0s delay - tighter OVP margin but faster response than BQ296111DSGT's 4.45V/4.0s. | Preferred in high-precision charging systems where 50mV lower OVP tolerance improves cell longevity. | Select BQ296112DSGT when faster fault response is prioritized over margin; verify FET drive timing compatibility. |
| BQ296114DSGT | 4.50V OVP threshold, 4.0s delay - matches BQ296111DSGT's timing but raises OVP threshold by 50mV. | Suitable for chemistries with higher nominal voltage or wider OCV spread (e.g., NMC with elevated end-of-charge). | Choose BQ296114DSGT for upgraded OVP margin without changing board layout or timing-critical firmware. |
Compared with BQ296111DSGT, BQ296112DSGT offers faster fault response at a slightly higher OVP setpoint, while BQ296114DSGT retains identical timing but increases OVP margin - both share the same 3.3V REG output, 8-pin WSON package, and UV threshold, enabling drop-in replacement in most designs.
Availability
BQ296111DSGT is available at Aetrix Electronics and suitable for notebook PC battery packs, ultrabook power management systems, and medical portable devices requiring stable component supply with guaranteed long-term lifecycle support.
Supply support for BQ296111DSGT 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 and embedded processing technologies, with decades of expertise in battery management ICs and precision analog design.
The BQ296xxx product line was designed specifically for second-level overvoltage protection in multi-cell Li-ion battery packs, integrating accurate voltage monitoring, programmable timing, and regulated auxiliary power in ultra-small packages.
FAQ
What is the factory-programmed overvoltage threshold for BQ296111DSGT?
The BQ296111DSGT has a factory-programmed overvoltage threshold of 4.45V with ±10mV accuracy at 25°C. This value is laser-trimmed during manufacturing and cannot be adjusted externally. It applies to all cell inputs (V1–VSS, V2–V1, V3–V2, V4–V3) and remains stable across –40°C to +110°C with specified drift limits.
How does the regulated output (REG) of BQ296111DSGT behave during battery discharge?
The BQ296111DSGT's REG pin delivers a stable 3.3V output up to 2mA, but self-disables when any monitored cell voltage falls below the factory-set 2.5V undervoltage threshold for 6 seconds. It re-enables only after all cells exceed 2.55V (2.5V + 50mV hysteresis), preventing deep discharge and preserving battery health.
What is the purpose of the PWPD pin on BQ296111DSGT?
The PWPD pin on BQ296111DSGT is the exposed thermal pad of the 8-pin WSON package. Texas Instruments recommends connecting it directly to the VSS net on the PCB to improve thermal dissipation and electrical stability. It is not a signal pin and must not be left floating or tied to other potentials.
Can BQ296111DSGT be used in a 2-cell battery configuration?
Yes, BQ296111DSGT supports 2-, 3-, and 4-series Li-ion configurations. In a 2-cell setup, connect V1 to the bottom cell's positive terminal, V2 to the top cell's positive terminal, and short V3 and V4 to V2. The device ignores unused sense inputs and continues full OVP monitoring on the active cells.
What external components are required for reliable operation of BQ296111DSGT?
BQ296111DSGT requires four 1kΩ/0.1µF RC filters (one per Vx pin), a 0.47µF ceramic capacitor on REG to VSS, a 0.1µF capacitor on VDD to VSS, and a 100Ω resistor between OUT and the gate of the external NMOS FET. These ensure noise immunity, regulator stability, and safe FET switching per TI's reference design.
BQ296111DSGT 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)
BQ296111DSGT FAQ
1.How can I place an order for BQ296111DSGT through Aetrix?
Please submit a Request for Quotation (RFQ) for BQ296111DSGT 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 BQ296111DSGT reliable?
The price and inventory of BQ296111DSGT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BQ296111DSGT is usually 5 days.
3.What payment methods are accepted for BQ296111DSGT?
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Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BQ296111DSGT?
BQ296111DSGT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BQ296111DSGT 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 BQ296111DSGT?
For technical support, including BQ296111DSGT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BQ296111DSGT requirements.
6.How does Aetrix verify that BQ296111DSGT is sourced from the original manufacturer or authorized distributors?
All BQ296111DSGT 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 BQ296111DSGT meets industry standards.
7.What is the process for return or replacement of BQ296111DSGT?
All BQ296111DSGT units undergo pre-shipment inspection (PSI). If there is an issue with BQ296111DSGT, 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 BQ296111DSGT part is unused and in its original packaging.
Return procedure for BQ296111DSGT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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