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Texas Instruments BQ29414DCTRG4
- Part No.:
- BQ29414DCTRG4
- Manufacturer:
- Texas Instruments
- Category:
- Battery Management
- Package:
- 8-LSSOP, 8-MSOP (0.110", 2.80mm Width)
- Datasheet:
-
BQ29414DCTRG4.pdf
- Description:
- IC BATT PROT LI-ION 2-4CELL SM8
- Quantity:
- Payment:
- Shipping:
Inventory:2,611
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Product details
Overview
BQ29414DCTRG4 from Texas Instruments is a 4-cell secondary overvoltage protection IC for Li-ion battery packs, featuring fixed 4.55 V per-cell overvoltage threshold, programmable delay via external capacitor on CD pin, and ultra-low 2 µA supply current. It operates across –40°C to 110°C and drives an external N-channel FET to blow a fuse during overvoltage events in notebook battery packs.
For engineers reviewing the BQ29414DCTRG4 datasheet, BQ29414DCTRG4 pinout, BQ29414DCTRG4 application, or BQ29414DCTRG4 equivalent, this page delivers verified technical context, exact pin functions, real-world timing behavior, and validated alternative options for second-level battery safety design.
Technical Context
The BQ29414DCTRG4 implements independent voltage monitoring across four cell terminals (VC1–VC4) with high-accuracy ±25 mV overvoltage detection at 25°C and ±80 mV over full temperature range. Its internal current source (0.18 µA) charges an external capacitor on the CD pin to generate a precise delay before OUT activation.
Upon reaching 1.2 V at CD, the open-drain OUT pin transitions high to trigger external fuse-blowing circuitry; recovery occurs only after all cells fall below (VPROTECT – Vhys) = 4.55 V – 0.32 V. The device rejects supply ripple and remains stable during pulse charging.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VPROTECT | 4.55 V - Fixed, factory-trimmed overvoltage threshold per cell; enables precise second-level cutoff before cell damage. |
| ICC | < 2 µA - Ultra-low quiescent current extends battery shelf life and minimizes self-discharge impact in standby. |
| Delay Time | 1–2 s with 0.22 µF CD capacitor - Programmable response window prevents nuisance trips during transient spikes. |
| Vhys | 320 mV - Hysteresis ensures clean reset without oscillation after overvoltage clears. |
| Operating Temp | –40°C to 110°C - Supports industrial and automotive battery pack environments with full parameter validity. |
| Supply Range | 4 V to 25 V - Compatible with 2–4 series Li-ion stacks (8.4 V to 16.8 V nominal) plus margin for charging transients. |
Pinout & Package
Package: 8-pin MSOP (DCT), 3.0 mm × 3.0 mm × 1.0 mm body, RoHS-compliant, tape-and-reel (3000 pcs/reel).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VC1 | Most positive cell voltage sense | Connects to top of 4-cell stack; reference point for all differential measurements. |
| VC2 | Second most positive cell voltage sense | Measures voltage between cell 1 and cell 2; enables per-cell monitoring in series configuration. |
| VC3 | Third most positive cell voltage sense | Monitors cell 2–cell 3 junction; required for accurate 4-cell balancing-aware protection. |
| GND | Ground reference | System ground return; must be low-impedance path to avoid false triggering. |
| VC4 | Least positive cell voltage sense | Connects to bottom of stack (cell 4 anode); completes 4-cell differential sensing chain. |
| CD | Capacitor delay timer input | Charged by 0.18 µA internal current source; 1.2 V threshold sets delay time (tD = 1.2 V × CDELAY/0.18 µA). |
| VDD | Power supply input | Accepts 4–25 V; powers internal comparators and logic; decoupling capacitor required. |
| OUT | Open-drain output driver | Drives external N-FET gate; sinks ≤5 µA at 0.1 V, sources ≤1 mA at 3 V (VDD ≥ 4.3 V). |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 4.55 V overvoltage threshold | Eliminates external resistor network calibration; guarantees ±25 mV accuracy at 25°C for reliable cell-level cutoff. |
| Programmable delay via CD pin | Enables 1–2 s response window with 0.22 µF capacitor-rejects short-duration transients while ensuring fast fault response. |
| Ultra-low 2 µA supply current | Reduces parasitic drain on idle battery packs; supports >10-year shelf life in storage applications. |
| High ripple rejection | Maintains stable operation under 100 kHz switching noise from chargers or DC/DC converters without false triggers. |
| Stable during pulse charge | Immune to voltage overshoots during CC/CV charging phases; avoids premature shutdown during normal operation. |
Applications
| Smart Notebook Battery Packs | Medical Portable Infusion Pumps |
|---|---|
Use Scenario: 4-cell Li-ion battery pack in ultrabook requiring redundant overvoltage protection beyond primary BMS. IC Role / Device Role / Timing Role: Second-level hardware cutoff that activates only if primary controller fails or misreads cell voltage. Use Value: Prevents thermal runaway by blowing fuse within 2 seconds of sustained >4.55 V per cell-verified across –40°C to 110°C. |
Use Scenario: Sealed medical-grade battery module powering infusion pump with strict IEC 60601-1 safety requirements. IC Role / Device Role / Timing Role: Independent analog safety layer that operates without firmware or clock, meeting fail-safe design mandates. Use Value: Delivers deterministic 1.5 s delay (0.22 µF) and 320 mV hysteresis to prevent spurious shutdown during motor startup surges. |
| Industrial Handheld Scanners | Test & Measurement Portable Analyzers |
Use Scenario: Ruggedized barcode scanner using 3-series Li-ion cells subjected to repeated drop-induced voltage spikes. IC Role / Device Role / Timing Role: Voltage monitor on VC1–VC4 nodes with differential sensing to reject common-mode noise from mechanical shock. Use Value: Maintains <2 µA ICC during 72-hour standby; survives 1000+ charge cycles without calibration drift. |
Use Scenario: High-precision portable gas analyzer with 4-cell battery and embedded ADC requiring stable power rail. IC Role / Device Role / Timing Role: Hardware-enforced overvoltage guard that isolates battery from system upon fault-no software dependency. Use Value: Achieves ±80 mV VPROTECT accuracy over full –40°C to 110°C range, enabling field-deployable reliability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar secondary overvoltage protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BQ29413DCTR | 4.50 V overvoltage threshold; otherwise identical pinout, timing, and package. | Suitable for 4.2 V nominal cells with tighter margin; requires revalidation of delay timing due to 50 mV lower trip point. | Select when system tolerance allows 4.50 V cutoff and existing layout uses DCT package. |
| BQ29415DCTR | 4.60 V overvoltage threshold; same 2 µA ICC and CD-based delay architecture. | Used in high-voltage Li-ion variants (e.g., LiCoO2 with extended charge profiles); higher risk of cell degradation if misapplied. | Choose only for chemistries certified to 4.60 V per cell; verify thermal derating at 110°C ambient. |
Compared with BQ29414DCTRG4, BQ29413DCTR offers earlier intervention at 4.50 V for conservative designs, while BQ29415DCTR delays cutoff to 4.60 V for specialized high-capacity cells-both retain identical delay programming, low-power operation, and DCT footprint compatibility.
Availability
BQ29414DCTRG4 is available at Aetrix Electronics and suitable for notebook computers, portable instrumentation, and portable medical equipment requiring stable component supply with long-term lifecycle support.
Supply support for BQ29414DCTRG4 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 over 50 years of innovation in precision analog ICs.
The bq2941x family was designed specifically for secondary overvoltage protection in multi-cell Li-ion battery packs, delivering factory-trimmed accuracy, ultra-low power, and robust noise immunity for safety-critical energy storage systems.
FAQ
What is the exact overvoltage protection threshold of the BQ29414DCTRG4?
The BQ29414DCTRG4 has a fixed, factory-trimmed overvoltage protection threshold of 4.55 V per cell, specified with ±25 mV accuracy at 25°C and ±80 mV over the full –40°C to 110°C operating range. This value is laser-trimmed during production and cannot be adjusted externally. The BQ29414DCTRG4 uses this precise threshold to initiate the CD pin delay sequence when any monitored cell exceeds 4.55 V.
How does the BQ29414DCTRG4 implement programmable delay, and what capacitor value achieves 1.5-second response?
The BQ29414DCTRG4 charges an external capacitor on the CD pin using a 0.18 µA internal current source; delay time is calculated as tD = (1.2 V × CDELAY) / 0.18 µA. For a 1.5-second delay, a 0.22 µF capacitor is required (1.2 V × 0.22 µF / 0.18 µA ≈ 1.47 s). The BQ29414DCTRG4 datasheet validates this timing across temperature and supply voltage variations.
Can the BQ29414DCTRG4 be used in a 3-cell Li-ion configuration, and how should pins be connected?
Yes, the BQ29414DCTRG4 supports 2-, 3-, or 4-cell configurations. For 3-cell use, connect VC1 and VC2 together to the top of the stack, VC3 to the middle node, VC4 to the bottom node, and GND to system ground. The BQ29414DCTRG4 automatically adapts its differential sensing-VC1–VC2, VC2–VC3, VC3–VC4-to monitor each cell voltage without external resistors.
What is the function of the OUT pin on the BQ29414DCTRG4, and what drive capability does it provide?
The OUT pin on the BQ29414DCTRG4 is an open-drain output that transitions high (to VDD level) when overvoltage is detected and the CD pin reaches 1.2 V. It drives the gate of an external N-channel FET to blow a fuse in the battery's positive rail. The BQ29414DCTRG4 specifies IOL ≤ 5 µA at 0.1 V and IOH ≥ –1 mA at 3 V (VDD ≥ 4.3 V), enabling direct interface with standard logic-level FETs.
Is the BQ29414DCTRG4 still recommended for new designs, and what is its lifecycle status?
No-the BQ29414DCTRG4 is marked "Not Recommended for New Designs" (NRND) per Texas Instruments' official packaging addendum. It remains in production to support existing customers but TI advises migration to newer alternatives for new projects. The BQ29414DCTRG4 retains full specification compliance and supply continuity through Aetrix Electronics' lifecycle management program.
BQ29414DCTRG4 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:
- Obsolete
- 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
BQ29414DCTRG4 FAQ
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Please submit a Request for Quotation (RFQ) for BQ29414DCTRG4 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 BQ29414DCTRG4 reliable?
The price and inventory of BQ29414DCTRG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BQ29414DCTRG4 is usually 5 days.
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Once your BQ29414DCTRG4 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 BQ29414DCTRG4?
For technical support, including BQ29414DCTRG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BQ29414DCTRG4 requirements.
6.How does Aetrix verify that BQ29414DCTRG4 is sourced from the original manufacturer or authorized distributors?
All BQ29414DCTRG4 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 BQ29414DCTRG4 meets industry standards.
7.What is the process for return or replacement of BQ29414DCTRG4?
All BQ29414DCTRG4 units undergo pre-shipment inspection (PSI). If there is an issue with BQ29414DCTRG4, 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 BQ29414DCTRG4 part is unused and in its original packaging.
Return procedure for BQ29414DCTRG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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