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Texas Instruments BQ29410DCTT
- Part No.:
- BQ29410DCTT
- Manufacturer:
- Texas Instruments
- Category:
- Battery Management
- Package:
- 8-LSSOP, 8-MSOP (0.110", 2.80mm Width)
- Datasheet:
-
BQ29410DCTT.pdf
- Description:
- IC BATT PROT LI-ION 2-4CELL SM8
- Quantity:
- Payment:
- Shipping:
Inventory:377
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Product details
Overview
BQ29410DCTT 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, and programmable delay via external capacitor on CD pin; used in notebook computers to prevent cell overcharge during charging cycles.
For engineers reviewing the BQ29410DCTT datasheet, BQ29410DCTT pinout, BQ29410DCTT application, or BQ29410DCTT equivalent, this page delivers verified technical context, exact pin functions, real-world use scenarios, and validated alternative parts for second-level battery safety design.
Technical Context
The BQ29410DCTT implements precision per-cell voltage monitoring across up to four series-connected Li-ion cells using dedicated VC1–VC4 inputs, comparing each against an internal 4.35 V reference with ±25 mV accuracy at 25°C. It initiates protection only when any single cell exceeds V(PROTECT), avoiding false triggers from stack imbalance.
Upon overvoltage detection, an internal 0.18 µA current source charges an external capacitor on the CD pin; when CD reaches 1.2 V, the open-drain OUT pin pulls high to activate an external N-channel FET and blow the fuse. Recovery occurs only after all cells fall below (4.35 V – 320 mV) hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Overvoltage Threshold | 4.35 V ±25 mV at 25°C - precise trip point for second-level cell overvoltage cutoff in multi-cell Li-ion packs. |
| Supply Current | <2 µA - enables ultra-low-power operation in always-on battery protection circuits without draining standby capacity. |
| Delay Time Programmability | Configurable via CD pin capacitor (e.g., 0.22 µF → 1.5 s typical) - allows tuning of response time to avoid nuisance trips during transient voltage spikes. |
| Cell Input Range | 0–25 V per VC pin, differential range ±8 V - supports full 4-cell stack monitoring (up to ~16.8 V nominal) with margin. |
| Operating Temperature | –40°C to +110°C - qualified for harsh environments including portable instrumentation and industrial battery packs. |
| Output Drive | Open-drain OUT capable of sinking ≥5 µA at 0.1 V - directly interfaces with standard NCH gate drivers for fuse-blowing FETs. |
| Hysteresis | 320 mV - ensures clean recovery and prevents oscillation near trip threshold during slow voltage decay. |
Pinout & Package
Package: SSOP-8 (DCT), 3.0 mm × 3.0 mm body, 1.3 mm max height, 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 battery stack; monitors highest-potential cell in 2–4 series configuration. |
| 2 (VC2) | Second most positive cell voltage sense input | Used in 3- or 4-cell mode; connects between first and second cell in series string. |
| 3 (VC3) | Third most positive cell voltage sense input | Active only in 4-cell mode; connects between second and third cell. |
| 4 (GND) | Analog ground reference | System return for all internal comparators and CD timing circuit; must be low-impedance connection. |
| 5 (VC4) | Least positive cell voltage sense input | Connects to bottom cell's positive terminal (i.e., node above GND); essential for 2–4 cell monitoring. |
| 6 (CD) | Capacitor delay timing input | External capacitor sets overvoltage response delay; internal 0.18 µA current source charges it to 1.2 V trip level. |
| 7 (VDD) | Power supply input | Accepts 4–25 V; powers internal circuitry; may be tied to VC1 in standard configurations. |
| 8 (OUT) | Open-drain protection output | Drives external N-channel FET gate; transitions high to initiate fuse blow; requires pull-up resistor. |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 4.35 V overvoltage threshold | Eliminates need for external resistor dividers or trimming; guarantees consistent second-level protection across production units. |
| Programmable delay via CD pin | Enables system-specific response tuning (e.g., 0.22 µF = 1.5 s) to distinguish between harmful overvoltage and safe charge termination transients. |
| High ripple rejection | Stable operation under pulse charging waveforms; avoids false triggering from switching noise on cell voltage lines. |
| Low ICC & IIN | <2 µA supply current and <0.3 µA input bias enable integration into energy-sensitive battery management systems without compromising runtime. |
| Wide operating temperature range | –40°C to +110°C rating supports deployment in automotive accessory modules and ruggedized portable equipment. |
Applications
| Portable Instrumentation | Notebook Computers |
|---|---|
Use Scenario: Handheld multimeters and data loggers with removable Li-ion battery packs requiring fail-safe overvoltage cutoff during field charging. IC Role / Device Role / Timing Role: Secondary protection supervisor that monitors individual cell voltages and triggers fuse blow before primary charger fails. Use Value: Prevents thermal runaway in sealed enclosures where primary protection may be inaccessible or compromised. |
Use Scenario: Main battery pack in consumer notebooks where OEMs mandate redundant overvoltage protection beyond charger IC limits. IC Role / Device Role / Timing Role: Independent hardware-based overvoltage detector with fixed 4.35 V threshold and 1.5 s delay (0.22 µF CD). Use Value: Guarantees compliance with UL 2054 and IEC 62133 by adding certified, non-software-dependent safety layer. |
| Medical Portable Devices | Industrial Handheld Terminals |
Use Scenario: Battery-powered ECG monitors and infusion pumps needing certified secondary protection for patient safety-critical operation. IC Role / Device Role / Timing Role: Standalone analog overvoltage guard that operates independently of MCU firmware or charger communication bus. Use Value: Meets IEC 62304 Class C software safety requirements by eliminating reliance on programmable logic for critical fault response. |
Use Scenario: Rugged warehouse scanners and inventory terminals exposed to wide ambient temperatures and frequent hot-swap battery changes. IC Role / Device Role / Timing Role: Cell-balancing-agnostic protector that validates voltage per cell regardless of pack aging or mismatch. Use Value: Extends field life by preventing premature cell degradation due to undetected overvoltage in mismatched stacks. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar secondary overvoltage protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BQ29411DCTT | 4.40 V overvoltage threshold (50 mV higher), same pinout and timing behavior | Suitable for chemistries requiring higher cell voltage tolerance (e.g., LiCoO₂ with extended charge profiles) | Select when system-level validation confirms 4.40 V is safe for cell chemistry and thermal margin. |
| BQ29412DCTT | 4.45 V overvoltage threshold (100 mV higher), identical package and electrical interface | Used in high-voltage Li-ion variants (e.g., LiMn₂O₄ or blended cathodes) where 4.35 V is overly conservative | Choose only if battery specification explicitly permits >4.35 V per cell and thermal testing validates stability. |
Compared with BQ29410DCTT, BQ29411DCTT and BQ29412DCTT provide higher trip thresholds while maintaining identical timing, power, and package compatibility-enabling drop-in replacement when revised cell voltage specifications require tighter overvoltage margins.
Availability
BQ29410DCTT is available at Aetrix Electronics and suitable for notebook computers, portable instrumentation, and medical portable devices requiring stable component supply with long-term lifecycle support.
Supply support for BQ29410DCTT 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 90 years of innovation in reliable, high-performance components.
The BQ29410DCTT belongs to TI's bq2941x family of secondary battery protection ICs, designed specifically to add hardware-enforced overvoltage safety layers in multi-cell Li-ion packs without MCU dependency.
FAQ
What is the exact overvoltage protection threshold of the BQ29410DCTT?
The BQ29410DCTT has a fixed overvoltage protection threshold of 4.35 V ±25 mV at 25°C, with accuracy degrading to ±50 mV over –20°C to 85°C and ±80 mV over the full –40°C to 110°C operating range. This value is factory-trimmed and non-adjustable, ensuring consistent second-level protection across all units of BQ29410DCTT.
How does the BQ29410DCTT implement programmable delay time?
The BQ29410DCTT uses an internal 0.18 µA current source to charge an external capacitor connected to the CD pin; delay time equals (1.2 V × CDELAY) / 0.18 µA. For example, a 0.22 µF capacitor yields a typical delay of 1.5 seconds. The CD pin voltage is clamped to GND if overvoltage clears before reaching 1.2 V, preserving full delay for subsequent events.
Can the BQ29410DCTT monitor fewer than four cells?
Yes - the BQ29410DCTT supports 2-, 3-, or 4-cell configurations. In 2-cell mode, VC1 and VC2 are shorted together and connected to the top of the stack, VC3 is left unconnected or tied to VC2, and VC4 connects to the bottom cell's positive terminal. TI provides explicit connection diagrams for all three configurations in the SLUS669G datasheet.
What is the function of the OUT pin on the BQ29410DCTT?
The OUT pin on the BQ29410DCTT is an open-drain output that transitions high (pulls toward VDD) when overvoltage is detected and the CD capacitor reaches 1.2 V. It is designed to drive the gate of an external N-channel MOSFET, which then activates a fuse-blowing circuit in the battery's positive rail - providing irreversible hardware-level protection independent of system firmware.
Is the BQ29410DCTT pin-compatible with other members of the bq2941x family?
Yes - all bq2941x devices including BQ29410DCTT, BQ29411DCTT, and BQ29412DCTT share identical SSOP-8 (DCT) packaging, pinout, and interface logic. Only the overvoltage threshold differs (4.35 V, 4.40 V, 4.45 V respectively), making them direct drop-in replacements when threshold revision is acceptable for the target battery chemistry and safety validation.
BQ29410DCTT 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:
- 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:
- SM8
BQ29410DCTT FAQ
1.How can I place an order for BQ29410DCTT through Aetrix?
Please submit a Request for Quotation (RFQ) for BQ29410DCTT 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 BQ29410DCTT reliable?
The price and inventory of BQ29410DCTT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BQ29410DCTT is usually 5 days.
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Once your BQ29410DCTT 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 BQ29410DCTT?
For technical support, including BQ29410DCTT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BQ29410DCTT requirements.
6.How does Aetrix verify that BQ29410DCTT is sourced from the original manufacturer or authorized distributors?
All BQ29410DCTT 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 BQ29410DCTT meets industry standards.
7.What is the process for return or replacement of BQ29410DCTT?
All BQ29410DCTT units undergo pre-shipment inspection (PSI). If there is an issue with BQ29410DCTT, 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 BQ29410DCTT part is unused and in its original packaging.
Return procedure for BQ29410DCTT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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