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Texas Instruments BQ29410DCT3R
- Part No.:
- BQ29410DCT3R
- Manufacturer:
- Texas Instruments
- Category:
- Battery Management
- Package:
- 8-LSSOP, 8-MSOP (0.110", 2.80mm Width)
- Datasheet:
-
BQ29410DCT3R.pdf
- Description:
- IC BATT PROT LI-ION 2-4CELL SM8
- Quantity:
- Payment:
- Shipping:
Inventory:3,116
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Product details
Overview
BQ29410DCT3R 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, programmable delay via external capacitor on CD pin, and ultra-low 2 µA supply current. It monitors individual cell voltages (VC1–VC4), activates OUT high to trigger external fuse blow upon overvoltage, and supports notebook computers and portable instrumentation.
For engineers reviewing the BQ29410DCT3R datasheet, BQ29410DCT3R pinout, BQ29410DCT3R application, or BQ29410DCT3R equivalent, key selection criteria include its precise 4.35 V protection threshold, ±80 mV overvoltage detection accuracy over –40°C to 110°C, 1–2 s programmable delay with 0.22 µF capacitor, MSOP-8 (DCT) package compatibility, and role as second-level safety device in multi-cell Li-ion battery management systems.
Technical Context
The BQ29410DCT3R implements independent per-cell voltage monitoring using precision internal reference comparators. When any VCn–VC(n−1) or VC4–GND exceeds 4.35 V, an internal 0.18 µA current source charges the external CD capacitor until 1.2 V is reached, triggering OUT high.
It features hysteresis of 320 mV to prevent oscillation during recovery, maintains stable operation under pulse charging, and rejects high-frequency supply ripple without requiring external filtering beyond recommended RVD/CVD network. The device operates across 4 V to 25 V supply range and supports differential input voltage up to 8 V between adjacent sense pins.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Overvoltage Threshold | 4.35 V - Fixed, factory-trimmed trip point for all cells; ensures consistent second-level protection against Li-ion cell overcharge. |
| Overvoltage Accuracy | ±80 mV over –40°C to 110°C - Guarantees reliable trip margin within safe operating window across full industrial temperature range. |
| Supply Current (ICC) | <2 µA - Enables long-term battery pack standby without significant self-discharge impact on host system. |
| Delay Time Range | 1–2 s with 0.22 µF CD capacitor - Provides configurable response window to distinguish transient spikes from sustained overvoltage events. |
| Operating Temperature | –40°C to 110°C - Rated for use in demanding portable and industrial battery environments including hot battery compartments. |
| Input Voltage Range (VCn) | 0–25 V - Supports direct connection to stacked Li-ion cells up to 4S (16.8 V max nominal) with headroom for overvoltage transients. |
| Hysteresis | 320 mV - Ensures clean, bounce-free reset after overvoltage clears, preventing repeated false trips during recovery. |
Pinout & Package
Package: SSOP-8 (DCT), 3.0 mm × 4.4 mm, 1.3 mm max height, lead pitch 0.65 mm, RoHS-compliant SNBI or NIPDAU finish, MSL Level-1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (VC1) | Most positive cell voltage sense input | Connects to top of 4S stack (or shared with VDD in 2S/3S); must be wired first in sequence per TI layout guidance. |
| 2 (VC2) | Second most positive cell voltage sense input | Monitors voltage between cell 1 and cell 2 in 4S; tied to VC1 in 3S configuration per datasheet Figure 4. |
| 3 (VC3) | Third most positive cell voltage sense input | Used in 4S only; connects between cell 2 and cell 3; left floating or tied appropriately in lower-cell configurations. |
| 4 (GND) | Analog and power ground reference | Common return for all sense inputs and internal circuitry; requires low-impedance PCB connection to battery pack ground plane. |
| 5 (VC4) | Least positive cell voltage sense input | Connects to bottom of stack (cell 4 cathode or cell 1 anode in 4S); also used as reference for VC4–GND measurement. |
| 6 (CD) | Capacitor delay timing input | Accepts external 0.22 µF capacitor; internal 0.18 µA current source charges it to 1.2 V to set 1–2 s delay before OUT assertion. |
| 7 (VDD) | Power supply input | Supplies internal circuitry; can be connected to VC1 in 4S or derived from regulated auxiliary rail; rated 4–25 V. |
| 8 (OUT) | Open-drain protection output | Drives high (up to 2.5 V at 40 µA) to activate external N-channel FET for fuse blow; pulled low when no fault detected. |
Key Features
| Feature | Design Value |
|---|---|
| Fixed high-accuracy overvoltage threshold | 4.35 V ±80 mV over full temperature range - eliminates need for external trimming or calibration in production. |
| Programmable overvoltage detection delay | 1–2 s via single external capacitor on CD pin - enables robust rejection of short-duration voltage spikes without firmware involvement. |
| Ultra-low quiescent current | <2 µA ICC - minimizes parasitic drain on battery pack during storage or idle, extending shelf life. |
| High supply ripple rejection | Stable operation with >200 mVpp ripple on VDD - avoids false triggering in noisy battery systems with switching chargers or DC-DC converters. |
| Stable under pulse charge conditions | No false trips during 1–2 A pulsed charging waveforms - validated for use in fast-charging portable equipment with dynamic load profiles. |
Applications
| Notebook Computer Battery Packs | Portable Instrumentation Power Systems |
|---|---|
Use Scenario: 4-cell Li-ion battery pack in ultrabook with fast-charge capability and thermal management constraints. IC Role / Device Role / Timing Role: Second-level hardware overvoltage protector that independently verifies each cell voltage and triggers fuse blow if any cell exceeds 4.35 V. Use Value: Prevents catastrophic thermal runaway by acting within 2 seconds of sustained overvoltage, independent of host MCU or primary BMS. |
Use Scenario: Handheld multimeter or gas analyzer with sealed 3-cell Li-ion battery requiring UL/IEC 62133 compliance. IC Role / Device Role / Timing Role: Standalone safety monitor providing redundant overvoltage cutoff when primary fuel gauge fails or enters sleep mode. Use Value: Meets IEC 62133 Clause 8.3.1 requirement for secondary protection with <2 s response time and <50 mV tolerance drift over temperature. |
| Medical Portable Diagnostic Devices | Industrial Handheld Scanners |
Use Scenario: FDA-cleared point-of-care ultrasound device with replaceable 2-cell Li-ion battery module. IC Role / Device Role / Timing Role: Independent hardware safety layer that disables battery output before cell voltage reaches 4.40 V, enforcing strict 4.35 V limit. Use Value: Enables Class II medical device certification by guaranteeing fail-safe behavior even if main processor locks up or firmware corrupts. |
Use Scenario: Rugged warehouse scanner operating in ambient temperatures from –20°C to 60°C with frequent drop impacts. IC Role / Device Role / Timing Role: Overvoltage guard activated only when physical cell stress (e.g., mechanical shock-induced voltage spike) exceeds 4.35 V for >1.5 s. Use Value: Eliminates need for software-based voltage monitoring during shock events where MCU may reset or miss sampling windows. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar secondary overvoltage protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BQ29411DCT3R | 4.40 V overvoltage threshold (50 mV higher), same accuracy, pinout, and delay architecture | Suitable for battery chemistries requiring higher end-of-charge voltage, e.g., certain high-capacity NMC variants | Select when design targets 4.40 V cell limit and maintains identical layout and timing behavior |
| BQ29412DCT3R | 4.45 V threshold (100 mV higher), identical package, supply current, and temperature rating | Used in premium notebooks with advanced Li-ion cells rated for 4.45 V operation and tighter SOC estimation | Choose only if battery specification explicitly requires 4.45 V protection; otherwise BQ29410DCT3R provides optimal safety margin for standard 4.35 V cells |
Compared with BQ29411DCT3R and BQ29412DCT3R, the BQ29410DCT3R delivers the tightest safety margin for conventional Li-ion cells, minimizing risk of overcharge while maintaining identical board footprint, timing control, and low-power operation - critical for cost-sensitive, high-volume portable designs.
Availability
BQ29410DCT3R is available at Aetrix Electronics and suitable for notebook computer battery packs, portable instrumentation power systems, and medical diagnostic devices requiring stable component supply with guaranteed long-term sourcing and full traceability.
Supply support for BQ29410DCT3R 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 and embedded processing solutions, with over 50 years of innovation in power management, signal chain, and battery protection technologies.
The BQ2941x family was designed specifically for secondary overvoltage protection in multi-cell Li-ion battery packs, addressing safety-critical requirements in portable computing, medical, and industrial applications where hardware-enforced redundancy is mandatory.
FAQ
What is the exact overvoltage protection threshold voltage of the BQ29410DCT3R?
The BQ29410DCT3R has a fixed, factory-trimmed overvoltage protection threshold of 4.35 V per cell, with accuracy of ±25 mV at 25°C and ±80 mV over the full –40°C to 110°C operating range. This value is specific to the BQ29410DCT3R variant and is not user-adjustable.
How does the BQ29410DCT3R implement programmable delay for overvoltage detection?
The BQ29410DCT3R uses an internal 0.18 µA current source to charge an external capacitor connected to the CD pin. When the CD voltage reaches 1.2 V, the OUT pin asserts high. With a 0.22 µF capacitor, this yields a nominal delay of 1.5 s (range 1–2 s), allowing discrimination between transient spikes and dangerous overvoltage conditions.
Can the BQ29410DCT3R be used in a 2-cell Li-ion battery configuration?
Yes, the BQ29410DCT3R supports 2-, 3-, and 4-cell configurations. In a 2-cell setup, VC1, VC2, and VC3 are connected together to the positive terminal of cell 1, VC4 connects to the negative terminal of cell 2, and GND connects to the battery pack ground - per Figure 5 in the SLUS669G datasheet.
What is the maximum allowable voltage difference between adjacent sense pins (e.g., VC1–VC2) on the BQ29410DCT3R?
The BQ29410DCT3R specifies a maximum differential voltage of 8 V between adjacent sense terminals (VC1–VC2, VC2–VC3, VC3–VC4, VC4–GND). This allows safe operation across full 4-cell Li-ion stacks (up to ~16.8 V nominal) with sufficient margin for overvoltage transients.
Does the BQ29410DCT3R require external passive components for basic operation?
Yes - the BQ29410DCT3R requires an external 0.22 µF capacitor on the CD pin for delay timing, plus recommended RC filters: 100 Ω–1 kΩ resistor (RIN) and 0.01–0.1 µF capacitor (CIN) on each VC pin, and 0–1 kΩ resistor (RVD) with 0.1 µF capacitor (CVD) on VDD to ensure noise immunity and stable operation.
BQ29410DCT3R 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
BQ29410DCT3R FAQ
1.How can I place an order for BQ29410DCT3R through Aetrix?
Please submit a Request for Quotation (RFQ) for BQ29410DCT3R 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 BQ29410DCT3R reliable?
The price and inventory of BQ29410DCT3R are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BQ29410DCT3R is usually 5 days.
3.What payment methods are accepted for BQ29410DCT3R?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BQ29410DCT3R transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BQ29410DCT3R?
BQ29410DCT3R orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BQ29410DCT3R 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 BQ29410DCT3R?
For technical support, including BQ29410DCT3R datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BQ29410DCT3R requirements.
6.How does Aetrix verify that BQ29410DCT3R is sourced from the original manufacturer or authorized distributors?
All BQ29410DCT3R 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 BQ29410DCT3R meets industry standards.
7.What is the process for return or replacement of BQ29410DCT3R?
All BQ29410DCT3R units undergo pre-shipment inspection (PSI). If there is an issue with BQ29410DCT3R, 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 BQ29410DCT3R part is unused and in its original packaging.
Return procedure for BQ29410DCT3R:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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