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Texas Instruments BQ29412DCTR
- Part No.:
- BQ29412DCTR
- Manufacturer:
- Texas Instruments
- Category:
- Battery Management
- Package:
- 8-LSSOP, 8-MSOP (0.110", 2.80mm Width)
- Datasheet:
-
BQ29412DCTR.pdf
- Description:
- IC BATT PROT LI-ION 2-4CELL SM8
- Quantity:
- Payment:
- Shipping:
Inventory:2,928
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Product details
Overview
BQ29412DCTR from Texas Instruments is a secondary overvoltage protection IC for 2-, 3-, or 4-cell Li-ion battery packs, featuring fixed 4.45 V per-cell overvoltage threshold, <2 µA supply current, and programmable delay via external capacitor on CD pin; used in notebook computers and portable instrumentation to prevent cell damage during charging.
For engineers reviewing the BQ29412DCTR datasheet, BQ29412DCTR pinout, BQ29412DCTR application, or BQ29412DCTR equivalent, this page delivers verified technical context, package-validated pin functions, real-world use scenarios, and two confirmed alternative parts with documented functional differences.
Technical Context
The BQ29412DCTR continuously monitors individual cell voltages (VC1–VC4) against a precision internal reference and triggers protection when any cell exceeds 4.45 V ±80 mV across –40°C to 110°C. It initiates a delay by charging an external capacitor at 0.18 µA through the CD pin until 1.2 V is reached.
Upon CD pin voltage reaching 1.2 V, the open-drain OUT pin transitions high to activate an external N-channel FET, enabling fuse blow in the positive battery rail. Recovery occurs only after all cells fall below 4.45 V minus 320 mV hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Overvoltage Threshold | 4.45 V per cell, fixed and factory-trimmed - ensures precise second-level cell protection without external adjustment. |
| Supply Current | <2 µA at 25°C - enables ultra-low-power operation in always-on battery protection circuits. |
| Overvoltage Accuracy | ±80 mV over –40°C to 110°C - guarantees reliable trip point across full industrial temperature range. |
| Delay Time Control | Programmable via CD pin and external capacitor (e.g., 0.22 µF yields ~1.5 s delay) - allows system-level tuning of response timing. |
| Cell Count Support | 2-, 3-, or 4-cell configurations - accommodates common Li-ion pack topologies with flexible VCx pin assignment. |
| Output Type | Open-drain OUT pin - interfaces directly with external NCH FET gate for high-side fuse control. |
| Operating Temperature | –40°C to 110°C - supports deployment in demanding portable and industrial battery applications. |
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 input | Connects to battery pack's highest-potential node (e.g., series string + terminal); defines reference for multi-cell monitoring. |
| 2 (VC2) | Second most positive cell voltage sense input | Monitors voltage between first and second cells in series stack; required for 3- and 4-cell configurations. |
| 3 (VC3) | Third most positive cell voltage sense input | Enables 4-cell monitoring; tied to VC2 for 3-cell use; left floating or grounded per TI guidelines for 2-cell operation. |
| 4 (GND) | Analog and power ground reference | Common return for all internal comparators and bias circuitry; must be low-impedance connection to pack negative. |
| 5 (VC4) | Least positive cell voltage sense input | Connects to lowest-potential cell terminal (e.g., pack –); completes differential sensing chain for all cells. |
| 6 (CD) | Capacitor delay timing input | Drives external timing capacitor; internal 0.18 µA current source charges it to 1.2 V to set overvoltage response delay. |
| 7 (VDD) | Power supply input | Accepts 4 V to 25 V - powered directly from battery stack or regulated auxiliary rail; includes ripple rejection circuitry. |
| 8 (OUT) | Open-drain protection output | Drives external NCH FET gate; sinks current when inactive, pulls high (via external pull-up) to trigger fuse blow upon overvoltage. |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 4.45 V overvoltage threshold | Eliminates need for external resistor dividers or trimming; reduces BOM count and layout complexity in space-constrained packs. |
| Programmable overvoltage delay | Enables system-level coordination with primary charger ICs - avoids nuisance trips during transient voltage spikes or pulse charging. |
| High supply ripple rejection | Maintains stable operation under noisy battery rail conditions (e.g., switching charger noise), preventing false triggering. |
| Stable during pulse charge operation | Retains accuracy and timing integrity even with high dv/dt waveforms typical in fast-charging protocols. |
| Low 2 µA quiescent current | Minimizes self-discharge impact on battery standby life - critical for long-duration portable equipment storage. |
Applications
| Smartphone Battery Pack Protection | Notebook Computer Battery Management |
|---|---|
Use Scenario: Secondary overvoltage safeguard in 3-cell Li-ion packs subjected to aggressive fast-charging algorithms. IC Role / Device Role / Timing Role: Monitors VC1–VC4 voltages independently and asserts OUT only after confirmed 4.45 V breach sustained for programmed delay. Use Value: Prevents thermal runaway by blowing fuse before cell voltage reaches destructive levels, complementing primary charger IC protection. |
Use Scenario: Redundant cell-level overvoltage detection in 4-cell laptop battery modules operating across –20°C to 60°C ambient. IC Role / Device Role / Timing Role: Acts as independent hardware-based safety layer, decoupled from firmware-controlled BMS microcontroller. Use Value: Ensures fail-safe shutdown even if host MCU locks up or software fails - meets UL/IEC 62133 secondary protection requirements. |
| Portable Medical Instrument Power | Industrial Handheld Scanner Battery |
Use Scenario: Overvoltage backup in sealed 2-cell Li-ion packs powering Class II medical devices requiring >10-year shelf life. IC Role / Device Role / Timing Role: Provides passive, always-active monitoring with <2 µA ICC - no wake-up latency or clock dependency. Use Value: Guarantees protection integrity during decades-long storage without battery cycling or maintenance. |
Use Scenario: Second-tier protection in ruggedized 3-cell packs exposed to wide temperature swings (–40°C to 70°C) in warehouse environments. IC Role / Device Role / Timing Role: Compares each cell to 4.45 V reference with ±80 mV accuracy over full temp range; triggers OUT only after CD capacitor fully charges. Use Value: Delivers consistent trip behavior regardless of ambient temperature - eliminates calibration drift seen in discrete solutions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar secondary overvoltage protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BQ29411DCTR | 4.40 V overvoltage threshold (50 mV lower), identical pinout and timing architecture | Suitable where tighter cell voltage margin is required before secondary shutdown, e.g., high-precision chemistries | Select when system design mandates earlier intervention than 4.45 V - no PCB changes needed due to pin-to-pin compatibility. |
| BQ29413DCTR | 4.50 V overvoltage threshold (50 mV higher), same DCT-8 package and electrical interface | Used in applications tolerating higher cell stress before secondary action, such as legacy Li-ion formulations | Choose for backward compatibility with older battery designs calibrated for 4.50 V trip - shares identical footprint and layout. |
Compared with BQ29412DCTR, BQ29411DCTR provides earlier overvoltage response for enhanced safety margins, while BQ29413DCTR delays action to accommodate wider voltage tolerances - both retain identical delay programming, supply current, and temperature performance.
Availability
BQ29412DCTR is available at Aetrix Electronics and suitable for notebook computer battery packs, portable medical instruments, and industrial handheld scanners requiring stable component supply with guaranteed long-term continuity.
Supply support for BQ29412DCTR 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, embedded processing, and connectivity technologies with focus on reliability and industrial-grade performance.
The bq2941x family was designed specifically for redundant, hardware-based overvoltage protection in multi-cell Li-ion battery packs - prioritizing precision, ultra-low power, and robustness over wide temperature ranges.
FAQ
What is the exact overvoltage protection threshold of the BQ29412DCTR?
The BQ29412DCTR has a fixed, factory-trimmed overvoltage threshold of 4.45 V per cell, with accuracy of ±80 mV over the full operating temperature range of –40°C to 110°C. This value is specific to the BQ29412DCTR variant and differs from other members of the bq2941x family such as BQ29411DCTR (4.40 V) or BQ29413DCTR (4.50 V).
How does the BQ29412DCTR implement programmable delay time?
The BQ29412DCTR implements programmable delay using an internal 0.18 µA current source that charges an external capacitor connected to the CD pin. When the CD pin voltage reaches 1.2 V, the OUT pin activates. For example, a 0.22 µF capacitor yields a nominal delay of 1.5 seconds, calculated as tD = (1.2 V × CDELAY) / 0.18 µA - a key design parameter confirmed in the BQ29412DCTR datasheet.
Can the BQ29412DCTR be used in a 2-cell battery configuration?
Yes, the BQ29412DCTR supports 2-cell configurations. Per TI documentation, VC1 and VC2 are connected together and tied to the positive terminal of the 2-cell stack, VC4 connects to the negative terminal, and VC3 is left unconnected or grounded per layout guidelines. The device maintains full overvoltage monitoring capability across both cells in this mode.
What package type and dimensions does the BQ29412DCTR use?
The BQ29412DCTR uses the SSOP-8 (DCT) package: 3.95 mm × 4.25 mm body size, 1.3 mm maximum height, 0.65 mm lead pitch, and RoHS-compliant NIPDAU lead finish. Its pin 1 quadrant is Q3 in tape-and-reel packaging, and it carries the top-marking "CJJ" - all verified in TI's official package drawings and ordering addendum for BQ29412DCTR.
Does the BQ29412DCTR require external components for basic operation?
Yes - the BQ29412DCTR requires at minimum an external timing capacitor on the CD pin to set overvoltage delay, a pull-up resistor on the open-drain OUT pin to drive the external N-channel FET gate, and proper RC filtering on VDD and VCx inputs per TI's recommended values (e.g., RVD = 0–1 kΩ, CVD = 0.1 µF). These are mandatory for stable, specification-compliant operation of the BQ29412DCTR.
BQ29412DCTR 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
BQ29412DCTR FAQ
1.How can I place an order for BQ29412DCTR through Aetrix?
Please submit a Request for Quotation (RFQ) for BQ29412DCTR 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 BQ29412DCTR reliable?
The price and inventory of BQ29412DCTR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BQ29412DCTR is usually 5 days.
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BQ29412DCTR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BQ29412DCTR 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 BQ29412DCTR?
For technical support, including BQ29412DCTR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BQ29412DCTR requirements.
6.How does Aetrix verify that BQ29412DCTR is sourced from the original manufacturer or authorized distributors?
All BQ29412DCTR 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 BQ29412DCTR meets industry standards.
7.What is the process for return or replacement of BQ29412DCTR?
All BQ29412DCTR units undergo pre-shipment inspection (PSI). If there is an issue with BQ29412DCTR, 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 BQ29412DCTR part is unused and in its original packaging.
Return procedure for BQ29412DCTR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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