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Texas Instruments BQ29411DCTRG4
- Part No.:
- BQ29411DCTRG4
- Manufacturer:
- Texas Instruments
- Category:
- Battery Management
- Package:
- 8-LSSOP, 8-MSOP (0.110", 2.80mm Width)
- Datasheet:
-
BQ29411DCTRG4.pdf
- Description:
- IC BATT PROT LI-ION 2-4CELL SM8
- Quantity:
- Payment:
- Shipping:
Inventory:4,963
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Product details
Overview
BQ29411DCTRG4 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, and programmable delay via external capacitor on CD pin. It monitors individual cell voltages (VC1–VC4), triggers OUT high to activate external fuse-blowing circuitry, and operates across –40°C to 110°C in notebook battery safety systems.
For engineers reviewing the BQ29411DCTRG4 datasheet, BQ29411DCTRG4 pinout, BQ29411DCTRG4 application, or BQ29411DCTRG4 equivalent, this page delivers verified technical context, exact pin functions, real-world use cases in portable instrumentation and battery packs, and validated alternative parts with documented functional differences.
Technical Context
The BQ29411DCTRG4 implements precision voltage monitoring across up to four series-connected Li-ion cells using dedicated VC1–VC4 inputs referenced to GND. Its internal comparator compares each cell voltage against a trimmed 4.40 V threshold with ±80 mV accuracy over full temperature range.
Upon overvoltage detection, a 0.18 µA current source charges an external capacitor at CD pin; when CD reaches 1.2 V, OUT transitions high to drive an external N-channel FET for fuse activation. The device includes 250–320 mV hysteresis and rejects supply ripple during pulse charging.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Overvoltage Threshold | 4.40 V per cell - fixed, factory-trimmed value enabling precise second-level protection without external programming. |
| Supply Current (ICC) | <2 µA - ultra-low quiescent current preserves battery standby life in always-on protection circuits. |
| Overvoltage Accuracy | ±80 mV over –40°C to 110°C - ensures reliable trip point across automotive and industrial temperature extremes. |
| Delay Time Programmability | Configured via CD pin capacitor (e.g., 0.22 µF yields 1.5 s delay) - enables system-specific response timing without firmware. |
| Operating Temperature | –40°C to 110°C - supports deployment in high-ambient environments like power tools and medical portables. |
| Input Voltage Range | VCn pins: 0–25 V; differential cell voltage: 0–5 V - accommodates full Li-ion cell stack voltage swing with margin. |
| Output Drive | OUT sinks ≥5 µA low, sources ≥–1 mA high - directly interfaces with standard NCH gate drivers for fuse control. |
Pinout & Package
Package: SSOP-8 (DCT), 3.95 mm × 4.25 mm × 1.3 mm body, 0.65 mm pitch, RoHS-compliant NIPDAU lead finish, MSL Level-1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (VC1) | Most positive cell voltage sense input | Connects to top of 4-cell stack (or shared with VC2/VC3 in 2-/3-cell configs); sets reference for highest cell. |
| 2 (VC2) | Second most positive cell voltage sense input | Monitors voltage between first and second cell in 4-cell string; unused and tied to VC1 in 2-cell mode. |
| 3 (VC3) | Third most positive cell voltage sense input | Used only in 4-cell configuration; connects between second and third cell; tied to VC2 in 3-cell setup. |
| 4 (GND) | Ground reference terminal | System ground return for all internal comparators and current sources; must be low-impedance path. |
| 5 (VC4) | Least positive cell voltage sense input | Connects to bottom cell's positive terminal (i.e., node between cell 4 and GND in 4-cell pack). |
| 6 (CD) | Capacitor delay timing input | Accepts external capacitor (0.22 µF typical) to set overvoltage response delay; clamped to GND after reset. |
| 7 (VDD) | Power supply input | Operates from 4 V to 25 V; powers internal circuitry and provides bias for VCx inputs; decoupling required. |
| 8 (OUT) | Protection output driver | Open-drain compatible output that goes high to enable external NCH FET for fuse blow; 1.5–2.5 V logic level. |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 4.40 V Overvoltage Threshold | Eliminates need for external resistor dividers or calibration; guarantees consistent trip point across production lots. |
| Programmable Delay via CD Pin | Enables adjustable response time (1–2 s typical) using low-cost ceramic capacitor - avoids software-based timing dependencies. |
| High Ripple Rejection | Maintains stable operation during fast-charging pulses where supply noise exceeds 100 mVpp - prevents false trips. |
| Stable During Pulse Charge | Internal architecture suppresses transient-induced errors during CC/CV charge phase transitions - critical for USB-PD battery packs. |
| Low-Power Monitoring | Draws <2 µA continuously - extends shelf life of sealed battery packs without compromising safety coverage. |
Applications
| Notebook Computer Battery Packs | Portable Medical Instrumentation |
|---|---|
Use Scenario: Secondary overvoltage protection in multi-cell Li-ion battery modules used in ultrabooks and 2-in-1 devices. IC Role / Device Role / Timing Role: Monitors individual cell voltages in real time and triggers fuse blow within 1.5 s if any cell exceeds 4.40 V. Use Value: Prevents thermal runaway during charger malfunction or cell imbalance, meeting UL 2054 and IEC 62133 requirements. |
Use Scenario: Safety-critical backup power in handheld ECG monitors and infusion pumps requiring fail-safe battery management. IC Role / Device Role / Timing Role: Acts as hardware-enforced second-layer protection independent of primary BMS MCU. Use Value: Guarantees shutdown even if main controller fails, satisfying ISO 13485 and IEC 62304 Class C software safety requirements. |
| Industrial Portable Test Equipment | Power Tool Battery Packs |
Use Scenario: Ruggedized multimeters and oscilloscopes operating in field environments with wide ambient temperature swings. IC Role / Device Role / Timing Role: Provides temperature-compensated cell voltage monitoring across –40°C to 110°C operating range. Use Value: Maintains protection integrity during cold-start battery usage and hot-workshop operation without recalibration. |
Use Scenario: High-current 18V/20V battery packs for cordless drills and impact drivers subject to mechanical stress and vibration. IC Role / Device Role / Timing Role: Detects overvoltage during regenerative braking or sudden load dump events. Use Value: Enables robust fuse activation under high-noise conditions where primary BMS may miss transient overvoltages. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar secondary overvoltage protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BQ29412DCTR | Fixed 4.45 V overvoltage threshold; otherwise identical pinout, package, and timing behavior. | 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 nominal 4.2 V cell voltage and can tolerate 50 mV higher trip point. |
| BQ29410DCTR | Fixed 4.35 V threshold; same DCT-8 package, supply current, and delay architecture. | Preferred for conservative protection in legacy Li-ion cells or high-reliability aerospace applications where lower trip reduces risk. | Use when design margin analysis confirms 4.35 V is sufficient to prevent degradation while maintaining safety margin. |
Compared with BQ29411DCTRG4, BQ29412DCTR raises the trip point by +50 mV for higher-energy cells, while BQ29410DCTR lowers it by –50 mV for enhanced aging tolerance - both retain identical timing, power, and interface compatibility.
Availability
BQ29411DCTRG4 is available at Aetrix Electronics and suitable for notebook computer battery packs, portable medical instrumentation, and industrial test equipment requiring stable component supply with long-term lifecycle support.
Supply support for BQ29411DCTRG4 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 company delivering analog and embedded processing solutions, with leadership in power management, signal chain, and high-reliability ICs.
The BQ29411DCTRG4 belongs to TI's battery protection IC product line, designed specifically for hardware-enforced secondary overvoltage safety in multi-cell Li-ion battery systems.
FAQ
What is the overvoltage protection threshold of the BQ29411DCTRG4?
The BQ29411DCTRG4 has a fixed, factory-trimmed overvoltage protection threshold of 4.40 V per cell. This value is specified across the full operating temperature range (–40°C to 110°C) with ±80 mV accuracy and does not require external configuration. It is part of the bq2941x family where each variant offers a distinct threshold: BQ29410 = 4.35 V, BQ29411 = 4.40 V, BQ29412 = 4.45 V, etc. The BQ29411DCTRG4 implements this exact 4.40 V setting in an SSOP-8 (DCT) package.
How does the BQ29411DCTRG4 implement programmable delay for overvoltage response?
The BQ29411DCTRG4 uses its CD pin to accept an external capacitor that sets the overvoltage response delay. When an overvoltage condition occurs, an internal 0.18 µA current source charges the capacitor; the OUT pin activates when the CD voltage reaches 1.2 V. For example, a 0.22 µF capacitor yields a nominal 1.5 s delay. The BQ29411DCTRG4 datasheet provides the formula tD = (1.2 V × CDELAY) / ICD, confirming this behavior is intrinsic to the BQ29411DCTRG4 design.
Can the BQ29411DCTRG4 be used in 2-cell or 3-cell battery configurations?
Yes, the BQ29411DCTRG4 supports 2-, 3-, and 4-cell Li-ion configurations through specific pin interconnections. In 2-cell mode, VC1, VC2, and VC3 are tied together and connected to the top of the stack, while VC4 connects to the midpoint. In 3-cell mode, VC1 and VC2 are shorted. These configurations are explicitly defined in the BQ29411DCTRG4 datasheet Figures 4 and 5, and the device maintains full overvoltage detection capability in all three modes.
What is the supply current consumption of the BQ29411DCTRG4?
The BQ29411DCTRG4 draws less than 2 µA of supply current (ICC) under normal operating conditions at 25°C, and remains below 3 µA across the full –40°C to 110°C temperature range. This ultra-low quiescent current is measured with all VCx inputs biased at 3.5 V and VDD = VC1, as confirmed in the Electrical Characteristics table of the BQ29411DCTRG4 datasheet. It enables years of shelf life in sealed battery packs.
Does the BQ29411DCTRG4 provide hysteresis, and what is its value?
Yes, the BQ29411DCTRG4 includes built-in overvoltage hysteresis of 250–320 mV, depending on the specific variant. For the BQ29411DCTRG4, hysteresis is 320 mV (typical), meaning the device resets only after all monitored cell voltages fall below (4.40 V – 0.32 V) = 4.08 V. This prevents oscillation near the trip point and is guaranteed across temperature, as specified in the Electrical Characteristics section of the BQ29411DCTRG4 datasheet.
BQ29411DCTRG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-LSSOP, 8-MSOP (0.110", 2.80mm 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:
- SM8
BQ29411DCTRG4 FAQ
1.How can I place an order for BQ29411DCTRG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for BQ29411DCTRG4 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 BQ29411DCTRG4 reliable?
The price and inventory of BQ29411DCTRG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BQ29411DCTRG4 is usually 5 days.
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BQ29411DCTRG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BQ29411DCTRG4 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 BQ29411DCTRG4?
For technical support, including BQ29411DCTRG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BQ29411DCTRG4 requirements.
6.How does Aetrix verify that BQ29411DCTRG4 is sourced from the original manufacturer or authorized distributors?
All BQ29411DCTRG4 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 BQ29411DCTRG4 meets industry standards.
7.What is the process for return or replacement of BQ29411DCTRG4?
All BQ29411DCTRG4 units undergo pre-shipment inspection (PSI). If there is an issue with BQ29411DCTRG4, 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 BQ29411DCTRG4 part is unused and in its original packaging.
Return procedure for BQ29411DCTRG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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