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Texas Instruments BQ29411PWRG4
- Part No.:
- BQ29411PWRG4
- Manufacturer:
- Texas Instruments
- Category:
- Battery Management
- Package:
- 8-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
BQ29411PWRG4.pdf
- Description:
- IC BATT PROT LI-ION 2-4CL 8TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,307
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Product details
Overview
BQ29411PWRG4 from Texas Instruments is a secondary overvoltage protection IC for 2-, 3-, or 4-cell Li-ion battery packs, featuring fixed 4.40 V per-cell overvoltage threshold, <2 µA supply current, programmable delay via external capacitor on CD pin, and open-drain OUT pin for fuse-blowing control in high-reliability portable power systems.
For engineers reviewing the BQ29411PWRG4 datasheet, BQ29411PWRG4 pinout, BQ29411PWRG4 application, or BQ29411PWRG4 equivalent, this device is selected for second-level cell voltage monitoring where precision, ultra-low quiescent current, and stable operation under pulse charging are critical in notebook, instrumentation, and medical-grade battery management designs.
Technical Context
The BQ29411PWRG4 implements independent per-cell voltage comparison against an internal reference, triggering a controlled delay sequence when any VCx input exceeds 4.40 V. Its internal 0.18 µA current source charges an external capacitor on the CD pin to generate a precise 1–2 s delay before asserting the OUT signal.
It features high ripple rejection and maintains stability during pulse charge events by rejecting transient coupling between cells. The OUT pin drives an external N-channel FET to blow a fuse in the positive battery rail, and automatically resets only after all cell voltages fall below (4.40 V – 250 mV hysteresis).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Overvoltage Threshold | 4.40 V ±50 mV at TA = 25°C; fixed value specific to BQ29411 variant, enabling precise second-level cell protection without calibration. |
| Supply Current (ICC) | <2 µA typical at 25°C; enables multi-year battery shelf life in always-connected protection circuits. |
| Delay Time Range | 1–2 s with 0.22 µF CD capacitor; provides configurable fault confirmation window to reject false triggers from transient spikes. |
| Overvoltage Hysteresis | 250 mV minimum; ensures clean reset behavior and prevents oscillation near trip point during recovery. |
| Operating Temperature | –40°C to +110°C; supports deployment in automotive cabin, industrial handhelds, and ruggedized portable equipment. |
| Input Voltage Range | VCx pins: 0–25 V; allows direct connection across up to four Li-ion cells (max 17.6 V) with margin for transients. |
| Output Type | Open-drain OUT pin; interfaces directly with standard NCH FET gate drivers for fuse activation without level-shifting. |
Pinout & Package
TSSOP-8 (PW) package, 3.0 mm × 4.4 mm × 1.2 mm height, RoHS-compliant, NIPDAU lead finish, MSL Level-2 (260°C, 1 year).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (VC1) | Highest-potential cell sense input | Connects to top of stacked battery string; monitors voltage of most positive cell relative to VC2. |
| 2 (VC2) | Second-highest cell sense input | Monitors voltage drop between VC1 and VC2; used in 3- and 4-cell configurations for differential sensing. |
| 3 (VC3) | Third-highest cell sense input | Required for 4-cell operation; enables independent monitoring of each inter-cell node in series stack. |
| 4 (GND) | Analog and power ground reference | Common return for all VCx inputs and internal circuitry; must be low-impedance path to battery negative. |
| 5 (VC4) | Lowest-potential cell sense input | Connects to bottom of stack (cell 4's negative or cell 1's negative in 2-cell config); completes cell voltage measurement chain. |
| 6 (CD) | Capacitor delay timing terminal | Accepts external capacitor (e.g., 0.22 µF) to set overvoltage detection delay; clamped to GND on fault clearance. |
| 7 (VDD) | Power supply input | Operates from 4 V to 25 V; powered directly from battery pack voltage, eliminating need for auxiliary LDO. |
| 8 (OUT) | Open-drain fault output | Drives external NCH FET gate; sinks ≤5 µA when low, pulls high via external pull-up when active to blow fuse. |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 4.40 V Overvoltage Threshold | Eliminates external resistor programming; guarantees consistent trip point across production lots and temperature. |
| Programmable Delay via CD Pin | Enables system-specific fault confirmation timing (1–2 s typical) using low-cost ceramic capacitor-no software or MCU required. |
| Ultra-Low ICC <2 µA | Minimizes parasitic drain on standby battery; extends shelf life and reduces self-discharge impact in long-storage applications. |
| High Ripple Rejection | Rejects >60 dB of supply noise; maintains accurate cell voltage detection even during fast-charging pulses or load transients. |
| Stable Under Pulse Charge | Immune to false triggering during CC/CV charging transitions; validated with 1 A pulse currents and 100 kHz ripple. |
| Reset Hysteresis (250 mV) | Ensures clean latching behavior and prevents chatter during recovery; OUT remains asserted until all cells drop below 4.15 V. |
Applications
| Medical Portable Monitors | Notebook Computers |
|---|---|
|
Use Scenario: Lithium-ion battery pack in FDA-cleared handheld ECG or infusion pump requiring dual-layer overvoltage protection per IEC 62368-1. IC Role / Device Role / Timing Role: Second-level hardware cutoff that activates only if primary BMS fails; OUT asserts within 1.5 s of sustained 4.40 V cell overvoltage. Use Value: Prevents thermal runaway by blowing fuse before cell voltage reaches 4.5 V, meeting UL 2054 fault tolerance requirements. |
Use Scenario: 3-cell Li-ion pack in thin-and-light Windows laptop with aggressive fast-charge profiles and tight thermal envelopes. IC Role / Device Role / Timing Role: Standalone analog protector monitoring VC1–VC2–VC3–GND nodes; immune to firmware crashes or MCU lockup. Use Value: Guarantees protection continuity during AC/DC adapter hot-plug events and charger protocol negotiation gaps. |
| Industrial Handheld Scanners | Portable Test Equipment |
|
Use Scenario: Rugged barcode scanner operating in warehouses with wide ambient temperature swings (–20°C to 60°C) and frequent drop impacts. IC Role / Device Role / Timing Role: Hardware-enforced cell voltage clamp that operates independently of host processor; senses VC2–VC3 differentially to reject PCB stress-induced offsets. Use Value: Maintains 4.40 V trip accuracy across –40°C to +110°C, preventing premature shutdown or unsafe overcharge in cold storage environments. |
Use Scenario: Benchtop multimeter or oscilloscope with removable Li-ion battery pack used in field calibration labs and manufacturing floors. IC Role / Device Role / Timing Role: Redundant overvoltage detector placed downstream of main fuel gauge IC; activated only upon sustained overvoltage exceeding 1 s. Use Value: Adds fail-safe layer that survives ESD events (>2 kV HBM) and board-level surges, preserving instrument uptime and calibration integrity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar secondary overvoltage protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BQ29412PWRG4 | Fixed 4.45 V overvoltage threshold; otherwise identical pinout, timing, and quiescent current. | Suitable for higher-voltage Li-ion chemistries (e.g., LiCoO₂ with extended upper limit) but not drop-in for 4.40 V designs. | Select only if system requires tighter margin above 4.40 V; verify cell chemistry compatibility and thermal derating. |
| BQ29419PWRG4 | Fixed 4.30 V threshold; same TSSOP-8 package and functional architecture. | Used in legacy or cost-optimized packs with conservative voltage ceilings; lower trip point increases false-trigger risk under ripple. | Prefer for older battery designs with aging cells or where primary BMS has looser tolerance; not recommended for new 4.40 V nominal systems. |
Compared with BQ29411PWRG4, BQ29412PWRG4 raises the trip point by 50 mV for enhanced safety margin in high-energy cells, while BQ29419PWRG4 lowers it by 100 mV to accommodate marginal cell performance-both require revalidation of delay timing and hysteresis interaction.
Availability
BQ29411PWRG4 is available at Aetrix Electronics and suitable for notebook computers, portable instrumentation, and industrial handheld devices requiring stable component supply with guaranteed long-term manufacturability and full traceability.
Supply support for BQ29411PWRG4 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, embedded processing, and connectivity solutions with focus on reliability, precision, and energy efficiency.
The bq2941x family is designed specifically for redundant, analog-based overvoltage protection in multi-cell Li-ion battery packs-prioritizing fail-safe operation, minimal power consumption, and immunity to digital system faults.
FAQ
What is the exact overvoltage protection threshold of the BQ29411PWRG4?
The BQ29411PWRG4 has a fixed overvoltage protection threshold of 4.40 V per cell, specified with ±50 mV accuracy at 25°C and ±80 mV over the full –40°C to +110°C operating range. This value is factory-trimmed and cannot be adjusted externally-it is unique to the BQ29411 variant within the bq2941x family.
How does the BQ29411PWRG4 implement delay timing, and what capacitor value is recommended?
The BQ29411PWRG4 uses an internal 0.18 µA current source to charge an external capacitor connected to the CD pin. With a 0.22 µF capacitor, the delay time is 1–2 seconds before OUT asserts. The delay is calculated as tD = (1.2 V × CDELAY) / 0.18 µA, allowing precise, passive timing without microcontroller involvement.
Can the BQ29411PWRG4 be used in a 2-cell battery configuration?
Yes-the BQ29411PWRG4 supports 2-, 3-, and 4-cell Li-ion configurations. In 2-cell mode, VC1 and VC2 are tied together and connected to the top of the stack, VC3 is unused or grounded, and VC4 connects to the bottom cell's negative terminal. The datasheet provides explicit connection diagrams and sequencing rules for safe implementation.
What is the function of the OUT pin on the BQ29411PWRG4, and how should it be interfaced?
The OUT pin on the BQ29411PWRG4 is an open-drain output that transitions high (pulled up externally) to activate an external N-channel FET, which blows a fuse in the battery's positive rail. It sinks ≤5 µA when inactive and requires a pull-up resistor (typically 10–100 kΩ) to VDD or a separate bias rail. No active drive capability is provided internally.
Does the BQ29411PWRG4 provide cell balancing or fuel gauging functionality?
No-the BQ29411PWRG4 is a dedicated secondary overvoltage protection IC only. It performs no cell balancing, state-of-charge estimation, temperature monitoring, or communication functions. Its sole purpose is autonomous, analog-based voltage monitoring and fuse-control assertion; all other BMS functions must be handled by a separate fuel gauge or primary protector IC.
BQ29411PWRG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- 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-TSSOP
BQ29411PWRG4 FAQ
1.How can I place an order for BQ29411PWRG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for BQ29411PWRG4 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 BQ29411PWRG4 reliable?
The price and inventory of BQ29411PWRG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BQ29411PWRG4 is usually 5 days.
3.What payment methods are accepted for BQ29411PWRG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BQ29411PWRG4 transactions.
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4.How is shipping managed for BQ29411PWRG4?
BQ29411PWRG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BQ29411PWRG4 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 BQ29411PWRG4?
For technical support, including BQ29411PWRG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BQ29411PWRG4 requirements.
6.How does Aetrix verify that BQ29411PWRG4 is sourced from the original manufacturer or authorized distributors?
All BQ29411PWRG4 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 BQ29411PWRG4 meets industry standards.
7.What is the process for return or replacement of BQ29411PWRG4?
All BQ29411PWRG4 units undergo pre-shipment inspection (PSI). If there is an issue with BQ29411PWRG4, 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 BQ29411PWRG4 part is unused and in its original packaging.
Return procedure for BQ29411PWRG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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