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Texas Instruments BQ29410DCTTG4
- Part No.:
- BQ29410DCTTG4
- Manufacturer:
- Texas Instruments
- Category:
- Battery Management
- Package:
- 8-LSSOP, 8-MSOP (0.110", 2.80mm Width)
- Datasheet:
-
BQ29410DCTTG4.pdf
- Description:
- IC BATT PROT LI-ION 2-4CELL SM8
- Quantity:
- Payment:
- Shipping:
Inventory:2,108
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Product details
Overview
BQ29410DCTTG4 from Texas Instruments is a secondary overvoltage protection IC for 2-, 3-, or 4-cell Li-ion battery packs, featuring fixed 4.35 V overvoltage threshold, <2 µA supply current, programmable delay via external capacitor on CD pin, and OUT pin drive capable of activating external N-channel FETs for fuse blowing in notebook battery management systems.
For engineers reviewing the BQ29410DCTTG4 datasheet, BQ29410DCTTG4 pinout, BQ29410DCTTG4 application, or BQ29410DCTTG4 equivalent, key selection considerations include cell-count flexibility (2–4 series), precision voltage threshold tolerance (±25 mV at 25°C), low-power operation across –40°C to 110°C, and compatibility with standard SSOP-8 PCB layouts.
Technical Context
The BQ29410DCTTG4 implements independent per-cell voltage monitoring using four dedicated sense inputs (VC1–VC4) referenced to GND, comparing each against an internal precision bandgap reference. Overvoltage detection triggers a controlled delay circuit that charges an external capacitor via the CD pin at 0.18 µA until 1.2 V is reached.
Upon CD pin reaching 1.2 V, the open-drain OUT pin transitions high (pull-up required externally), enabling external FET control for permanent fuse blow in second-level protection schemes. The device maintains stable operation during pulse charging and rejects supply ripple up to 28 V on VDD and sense pins.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Overvoltage Threshold | 4.35 V ±25 mV (25°C); enables precise secondary cutoff before cell damage in Li-ion stacks |
| Supply Current (ICC) | <2 µA typical; supports ultra-low-quiescent battery pack monitoring without significant self-discharge |
| Delay Time Programmability | Configured via CD pin capacitor (e.g., 0.22 µF → 1.5 s typical); allows tuning of fault response window |
| Operating Temperature | –40°C to 110°C; validated for automotive cabin and industrial portable equipment environments |
| Input Voltage Range | VC1–VC4: 0–25 V; supports full Li-ion stack voltage range including transient overshoots |
| OUT Pin Drive | Open-drain, 1.5–2.5 V high-level output at 40 µA load; interfaces directly with gate of NCH FETs |
| Hysteresis | 320 mV; prevents oscillation during recovery by requiring cell voltage to drop to 4.03 V before reset |
Pinout & Package
Package: SSOP-8 (DCT), 3.95 mm × 4.25 mm × 1.3 mm body, 0.65 mm pitch, RoHS-compliant, moisture sensitivity 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 node in 2-/3-cell configurations |
| 2 (VC2) | Second most positive cell voltage sense input | Required for 3- or 4-cell monitoring; tied to VC1 in 2-cell mode |
| 3 (VC3) | Third most positive cell voltage sense input | Used only in 4-cell configuration; tied to VC2 in 3-cell mode |
| 4 (GND) | Ground reference | System ground return for all internal comparators and bias circuits |
| 5 (VC4) | Least positive (bottom) cell voltage sense input | Connects to cathode of lowest cell; defines reference for differential sensing |
| 6 (CD) | Capacitor delay timing input | Charged at 0.18 µA; 1.2 V threshold sets overvoltage response time |
| 7 (VDD) | Power supply input | Accepts 4–25 V; powers internal circuitry and provides bias for OUT pull-up |
| 8 (OUT) | Open-drain protection output | Drives external NCH FET gate; requires external pull-up resistor to VDD or battery rail |
Key Features
| Feature | Design Value |
|---|---|
| Fixed high-accuracy overvoltage threshold | 4.35 V with ±25 mV max error at 25°C ensures reliable secondary cutoff before 4.4 V cell stress |
| Programmable overvoltage detection delay | External capacitor on CD pin sets delay from ~1 s to >10 s, enabling system-specific fault hold-off |
| Low power consumption | <2 µA ICC allows continuous monitoring in always-on battery packs without measurable drain |
| High supply ripple rejection | Stable operation under 28 V transients on VDD and sense inputs prevents false triggering during charging |
| Stable during pulse charge operation | No false trips observed during high-dV/dt charging pulses, critical for fast-charge battery systems |
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 and triggers permanent fuse blow if any cell exceeds 4.35 V. Use Value: Prevents thermal runaway by enforcing strict voltage ceiling independent of primary protection IC decisions. |
Use Scenario: Safety-critical backup power for handheld diagnostic tools requiring certified fail-safe behavior. IC Role / Device Role / Timing Role: Acts as hardware-enforced last-resort cutoff, activated only when primary BMS fails. Use Value: Meets IEC 62368-1 and UL 2054 requirements for redundant overvoltage protection in Class II medical devices. |
| Industrial Handheld Scanners | Professional Power Tools |
Use Scenario: Ruggedized barcode scanners operating in warehouses with wide ambient temperature swings. IC Role / Device Role / Timing Role: Provides robust cell-level monitoring across –40°C to 110°C without calibration drift. Use Value: Eliminates need for microcontroller-based voltage sampling, reducing firmware complexity and BOM cost. |
Use Scenario: High-current cordless drill battery packs subject to rapid voltage transients during motor commutation. IC Role / Device Role / Timing Role: Detects overvoltage events during regenerative braking or sudden load release. Use Value: Maintains protection integrity despite 100+ V/µs dV/dt on sense lines due to integrated filtering design. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar secondary overvoltage protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BQ29411PW | 4.40 V overvoltage threshold; TSSOP-8 package; same electrical specs except V(PROTECT) | Suitable where higher cell voltage tolerance is needed (e.g., high-voltage Li-ion chemistries) | Select when system requires 4.40 V trip point and TSSOP-8 footprint is preferred |
| MP2672GQ-Z | Integrated MOSFET driver + 4.35 V threshold; 3.3–28 V supply; different pinout and no CD-programmable delay | Replaces discrete FET + protection IC combo; lacks adjustable delay but offers faster response | Choose when board space is constrained and fixed 100 ms response suffices instead of capacitor-tuned delay |
Compared with BQ29410DCTTG4, BQ29411PW offers identical functionality with a 50 mV higher threshold for wider chemistry margin, while MP2672GQ-Z integrates power switching but removes delay configurability-making BQ29410DCTTG4 optimal for designs requiring precise, user-adjustable fault hold-off timing.
Availability
BQ29410DCTTG4 is available at Aetrix Electronics and suitable for notebook computers, portable instrumentation, and industrial handheld equipment requiring stable component supply with long-term lifecycle support.
Supply support for BQ29410DCTTG4 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 specializing in analog and embedded processing technologies, with leadership in battery management, power conversion, and signal chain solutions.
The BQ29410DCTTG4 belongs to TI's bq2941x secondary protection IC family, designed specifically for redundant overvoltage safety in multi-cell Li-ion battery packs used in consumer and industrial portable electronics.
FAQ
What is the exact overvoltage protection threshold of the BQ29410DCTTG4?
The BQ29410DCTTG4 has a fixed overvoltage protection threshold of 4.35 V with a maximum accuracy tolerance of ±25 mV at 25°C and ±80 mV across the full –40°C to 110°C operating range. This value is factory-trimmed and non-adjustable, ensuring consistent secondary cutoff behavior across production units without calibration.
How does the BQ29410DCTTG4 implement programmable delay time?
The BQ29410DCTTG4 uses an internal 0.18 µA current source to charge an external capacitor connected to the CD pin. When the CD pin voltage reaches 1.2 V, the OUT pin activates. Delay time is calculated as tD = (1.2 V × CDELAY) / 0.18 µA - for example, a 0.22 µF capacitor yields ~1.5 s typical delay.
Can the BQ29410DCTTG4 be used in 2-cell battery configurations?
Yes, the BQ29410DCTTG4 supports 2-cell configurations by connecting VC1, VC2, and VC3 together to the positive terminal of the top cell, VC4 to the negative terminal of the bottom cell, and GND to system ground. This configuration uses only two sense points while maintaining accurate per-cell voltage monitoring.
What is the function of the OUT pin on the BQ29410DCTTG4?
The OUT pin on the BQ29410DCTTG4 is an open-drain output that transitions high (requires external pull-up) when overvoltage is detected and the CD delay expires. It is designed to drive the gate of an external N-channel FET, which in turn disconnects the battery pack or blows a fuse - providing irreversible secondary protection.
Does the BQ29410DCTTG4 require external passive components for basic operation?
Yes, the BQ29410DCTTG4 requires at minimum: (1) an external capacitor on the CD pin for delay timing, (2) a pull-up resistor on the OUT pin, and (3) optional RC filters on VC1–VC4 and VDD for noise immunity. No external voltage reference or precision resistors are needed - all sensing and threshold generation is internal.
BQ29410DCTTG4 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
BQ29410DCTTG4 FAQ
1.How can I place an order for BQ29410DCTTG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for BQ29410DCTTG4 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 BQ29410DCTTG4 reliable?
The price and inventory of BQ29410DCTTG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BQ29410DCTTG4 is usually 5 days.
3.What payment methods are accepted for BQ29410DCTTG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BQ29410DCTTG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BQ29410DCTTG4?
BQ29410DCTTG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BQ29410DCTTG4 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 BQ29410DCTTG4?
For technical support, including BQ29410DCTTG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BQ29410DCTTG4 requirements.
6.How does Aetrix verify that BQ29410DCTTG4 is sourced from the original manufacturer or authorized distributors?
All BQ29410DCTTG4 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 BQ29410DCTTG4 meets industry standards.
7.What is the process for return or replacement of BQ29410DCTTG4?
All BQ29410DCTTG4 units undergo pre-shipment inspection (PSI). If there is an issue with BQ29410DCTTG4, 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 BQ29410DCTTG4 part is unused and in its original packaging.
Return procedure for BQ29410DCTTG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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