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Texas Instruments BQ29413DCTR
- Part No.:
- BQ29413DCTR
- Manufacturer:
- Texas Instruments
- Category:
- Battery Management
- Package:
- 8-LSSOP, 8-MSOP (0.110", 2.80mm Width)
- Datasheet:
-
BQ29413DCTR.pdf
- Description:
- IC BATT PROT LI-ION 2-4CELL SM8
- Quantity:
- Payment:
- Shipping:
Inventory:3,368
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Product details
Overview
BQ29413DCTR from Texas Instruments is a secondary overvoltage protection IC for 2-, 3-, or 4-cell Li-ion battery packs, featuring fixed 4.50 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) and drives an external N-channel FET to blow the fuse upon overvoltage detection - used in notebook battery packs requiring redundant safety layer.
For engineers reviewing the BQ29413DCTR datasheet, BQ29413DCTR pinout, BQ29413DCTR application, or BQ29413DCTR equivalent, this page delivers verified technical context, exact pin functions, real-world use scenarios, and validated alternative parts with documented functional differences for second-level Li-ion battery protection design.
Technical Context
The BQ29413DCTR implements precision voltage monitoring across up to four series-connected Li-ion cells using dedicated sense inputs (VC1–VC4), comparing each against an internal 4.50 V reference with ±80 mV accuracy over –40°C to 110°C. Its overvoltage detection triggers a 0.18 µA current source charging an external capacitor at CD pin.
When CD voltage reaches 1.2 V, OUT transitions high to activate an external NCH FET; recovery occurs only after all cells fall below (4.50 V – 320 mV) hysteresis. The device operates from 4 V to 25 V supply (VDD), supports differential input ranges up to 8 V between adjacent VC pins, and maintains stable operation during pulse charging.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Overvoltage Threshold | 4.50 V per cell - fixed, factory-trimmed value enabling precise second-level cutoff before cell damage in 4S Li-ion packs. |
| Supply Current (ICC) | <2 µA - ultra-low quiescent current preserves battery standby life in always-connected 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 | Set by external CD capacitor (e.g., 0.22 µF → 1–2 s delay) - allows tuning of fault response time to avoid nuisance trips during transient spikes. |
| Output Drive | OUT pin drives high (≥1.5 V @ 40 µA) to control external NCH FET - provides robust interface to fuse-blowing circuitry without level-shifting. |
| Operating Voltage Range | VDD = 4 V to 25 V - accommodates full pack voltage range of 2S–4S Li-ion (8.4 V–16.8 V nominal, up to ~17.6 V max). |
| Cell Input Range | VCn–VC(n−1) ≤ 8 V differential - supports safe sensing across stacked cells with minimal interconnect voltage drop impact. |
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 | Connects to top of 4S stack (or VDD in 2S/3S); sets reference for highest cell voltage comparison. |
| 2 (VC2) | Second most positive cell voltage sense | Monitors voltage between first and second cell in series string; enables per-cell differential measurement. |
| 3 (VC3) | Third most positive cell voltage sense | Enables independent monitoring of third cell in 4S configuration; required for full 4-cell protection. |
| 4 (GND) | Ground reference | System ground return for all internal circuits and voltage references; must be low-impedance connection. |
| 5 (VC4) | Least positive cell voltage sense | Connects to bottom of stack (cell 4 anode / cell 3 cathode junction); completes 4-cell differential chain. |
| 6 (CD) | Capacitor delay timing input | External capacitor (e.g., 0.22 µF) sets overvoltage response delay; internal 0.18 µA current charges it to 1.2 V trip point. |
| 7 (VDD) | Power supply input | Accepts 4–25 V; powers internal circuitry and serves as reference for VC1 in 2S/3S configurations where VC1 = VDD. |
| 8 (OUT) | Protection output driver | Open-drain compatible high-side output; pulls high to enable external NCH FET for fuse blowing when overvoltage detected. |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 4.50 V overvoltage threshold | Eliminates need for external resistor dividers or trimming; guarantees consistent second-level cutoff across production units. |
| Programmable delay via CD pin | Enables system-specific response tuning (e.g., 1 s for notebooks, 500 ms for power tools) without firmware changes. |
| High ripple rejection | Rejects >500 mVpp supply ripple - prevents false triggering during charger switching noise or load transients. |
| Stable under pulse charge | Maintains accurate cell voltage sampling even during high-frequency current pulses (e.g., USB PD fast charging). |
| Low-power shutdown mode | ICC drops to <2 µA in normal operation - extends shelf life and reduces self-discharge in stored battery packs. |
Applications
| Notebook Battery Packs | Portable Medical Devices |
|---|---|
Use Scenario: Secondary overvoltage protection in multi-cell Li-ion battery modules for ultrabooks and 2-in-1 laptops. IC Role / Device Role / Timing Role: Monitors each cell voltage independently and triggers fuse blow within 1–2 seconds if any cell exceeds 4.50 V. Use Value: Prevents thermal runaway during AC adapter overvoltage events or BMS failure, meeting UL 2054 and IEC 62133 safety requirements. |
Use Scenario: Redundant cell protection in portable defibrillators and infusion pumps with sealed 3S Li-ion packs. IC Role / Device Role / Timing Role: Acts as hardware-enforced backup to primary fuel gauge IC, asserting OUT only when sustained overvoltage is confirmed. Use Value: Ensures fail-safe shutdown independent of microcontroller operation - critical for Class II medical device certification. |
| Industrial Handheld Scanners | Two-Way Radios |
Use Scenario: Overvoltage guard in ruggedized barcode scanners using 2S or 3S Li-ion batteries subjected to wide ambient temperatures. IC Role / Device Role / Timing Role: Senses VC1–VC3 in 3S config; uses CD capacitor to reject brief spikes from motor-driven trigger mechanisms. Use Value: Avoids false trips during mechanical shock-induced voltage transients while ensuring true overvoltage response within spec. |
Use Scenario: Second-tier protection in mission-critical PMR radios with 4S Li-ion packs operating in extreme environments. IC Role / Device Role / Timing Role: Compares all four cell voltages (VC1–VC4); activates OUT only after CD capacitor fully charges to 1.2 V. Use Value: Guarantees protection activation only during sustained overvoltage - essential for reliability in public safety communications gear. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar secondary overvoltage protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BQ29414DCTR | 4.55 V overvoltage threshold (50 mV higher), same pinout and timing architecture. | Suitable for higher-voltage Li-ion chemistries (e.g., LiCoO₂ with extended upper limit) or systems requiring wider margin before cutoff. | Select when design requires tighter control over upper cell voltage ceiling beyond standard 4.50 V. |
| BQ29412DCTR | 4.45 V overvoltage threshold (50 mV lower), identical package, supply current, and delay mechanism. | Preferred for conservative protection schemes in high-reliability applications where earlier intervention is mandated. | Choose for legacy designs aligned with older JEITA or manufacturer-specific 4.45 V cutoff specifications. |
Compared with BQ29413DCTR, BQ29414DCTR raises the trip point for enhanced headroom in high-voltage cells, while BQ29412DCTR lowers it for stricter safety margins - both retain identical timing, power, and interface behavior, enabling direct layout reuse in DCT-8 footprint.
Availability
BQ29413DCTR is available at Aetrix Electronics and suitable for notebook battery packs, portable medical devices, and industrial handheld scanners requiring stable component supply with long lifecycle support and traceable sourcing.
Supply support for BQ29413DCTR 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 decades of expertise in battery management solutions.
The bq2941x family was designed specifically for secondary overvoltage protection in multi-cell Li-ion battery packs, delivering hardware-based redundancy to complement primary fuel gauges and protect against catastrophic cell failure.
FAQ
What is the exact overvoltage protection threshold of the BQ29413DCTR?
The BQ29413DCTR has a fixed, factory-trimmed overvoltage detection threshold of 4.50 V per cell, specified with ±80 mV accuracy across –40°C to 110°C. This value is unique to the BQ29413DCTR within the bq2941x family and is not adjustable via external components - confirming its role as a precision second-level safety device in 2S–4S Li-ion battery packs.
How does the BQ29413DCTR implement programmable delay, and what capacitor value achieves a 1-second response?
The BQ29413DCTR uses an internal 0.18 µA current source to charge an external capacitor connected to the CD pin; delay time is calculated as tD = (1.2 V × CDELAY) / 0.18 µA. For a 1-second delay, a 0.22 µF capacitor is recommended - matching the value tested and specified in the BQ29413DCTR datasheet under typical conditions with VDD = VC1.
Can the BQ29413DCTR be used in a 2-cell Li-ion configuration, and how are the pins connected?
Yes, the BQ29413DCTR supports 2-cell operation: connect VC1 = VDD, short VC2 and VC3 together, connect VC4 to the junction between the two cells, and tie GND to the battery negative terminal. This configuration uses only three sense points (VC1, VC4, GND) while maintaining full overvoltage detection capability - verified in the BQ29413DCTR application diagrams for 2-series cell setup.
What is the maximum allowable differential voltage between adjacent VC pins on the BQ29413DCTR?
The BQ29413DCTR specifies a maximum differential input voltage of 8 V between adjacent sense terminals (e.g., VC1–VC2, VC2–VC3, VC3–VC4, VC4–GND). This rating ensures safe operation across worst-case cell imbalance scenarios in 4S Li-ion packs, where individual cell voltages may differ by up to 0.5 V - well within the 8 V margin and supporting robust design margins per ISO 6469-1.
Does the BQ29413DCTR require external passive components beyond the CD capacitor for basic operation?
For fundamental overvoltage protection, the BQ29413DCTR requires only the CD timing capacitor and an external N-channel FET controlled by the OUT pin. However, TI recommends adding RC filters (RIN = 100 Ω–1 kΩ, CIN = 0.01–0.1 µF per VC pin) and supply filtering (RVD/CVD) to suppress noise - these are documented in the BQ29413DCTR datasheet as best practices to ensure immunity to EMI in real-world battery pack environments.
BQ29413DCTR 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
BQ29413DCTR FAQ
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Please submit a Request for Quotation (RFQ) for BQ29413DCTR 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 BQ29413DCTR reliable?
The price and inventory of BQ29413DCTR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BQ29413DCTR is usually 5 days.
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Once your BQ29413DCTR 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 BQ29413DCTR?
For technical support, including BQ29413DCTR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BQ29413DCTR requirements.
6.How does Aetrix verify that BQ29413DCTR is sourced from the original manufacturer or authorized distributors?
All BQ29413DCTR 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 BQ29413DCTR meets industry standards.
7.What is the process for return or replacement of BQ29413DCTR?
All BQ29413DCTR units undergo pre-shipment inspection (PSI). If there is an issue with BQ29413DCTR, 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 BQ29413DCTR part is unused and in its original packaging.
Return procedure for BQ29413DCTR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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