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Texas Instruments BQ29414DCTR
- Part No.:
- BQ29414DCTR
- Manufacturer:
- Texas Instruments
- Category:
- Battery Management
- Package:
- 8-LSSOP, 8-MSOP (0.110", 2.80mm Width)
- Datasheet:
-
BQ29414DCTR.pdf
- Description:
- IC BATT PROT LI-ION 2-4CELL SM8
- Quantity:
- Payment:
- Shipping:
Inventory:4,469
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Product details
Overview
BQ29414DCTR from Texas Instruments is a secondary overvoltage protection IC for 2-, 3-, or 4-cell Li-ion battery packs, providing fixed 4.55 V per-cell overvoltage threshold with ±50 mV accuracy over –40°C to 110°C, programmable delay via external capacitor on CD pin, and low 2 µA supply current. It activates an external N-channel FET to blow a fuse in the positive battery rail upon overvoltage detection.
For engineers reviewing the BQ29414DCTR datasheet, BQ29414DCTR pinout, BQ29414DCTR application, or BQ29414DCTR equivalent, this page delivers verified technical context, exact pin functions, real-world timing behavior, and validated alternative options for second-level battery protection design.
Technical Context
The BQ29414DCTR implements independent voltage monitoring across up to four cell terminals (VC1–VC4), comparing each to an internal reference. When any cell exceeds 4.55 V, a 0.18 µA current source charges the external CD capacitor until 1.2 V is reached, triggering OUT high.
After activation, OUT remains high until all cell voltages fall below 4.55 V minus 320 mV hysteresis. The device rejects supply ripple and remains stable during pulse charging, with differential input tolerance of ±0.3 V between adjacent sense pins and full operation up to 25 V supply.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Overvoltage Threshold | 4.55 V ±50 mV (TA = –40°C to 110°C); sets precise trip point for second-level cell overvoltage cutoff |
| Supply Current | <2 µA typical; enables ultra-low-power battery pack monitoring without significant drain |
| Delay Time Control | Programmable via CD pin capacitor (e.g., 0.22 µF → 1–2 s delay); allows tuning of response time before fuse blow |
| Input Voltage Range | VC1–VC4: 0–25 V; supports full Li-ion stack range including transient overshoots |
| Hysteresis | 320 mV; prevents oscillation during recovery by requiring voltage to drop to 4.23 V before reset |
| Operating Temperature | –40°C to 110°C; qualified for industrial and portable equipment environments |
| Output Drive | OUT drives high to ≥1.5 V at 40 µA load; sufficient to gate NCH FET in fuse-blow circuit |
Pinout & Package
Package: 8-pin MSOP (DCT), 3.0 mm × 3.0 mm body, 0.65 mm pitch, 1.2 mm max height, RoHS-compliant CU-NiPdAu finish, MSL Level-1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (VC1) | Most positive cell voltage sense | Connects to top of series stack; monitors highest-potential cell terminal |
| 2 (VC2) | Second most positive cell voltage sense | Monitors voltage between first and second cells in 3- or 4-cell configuration |
| 3 (VC3) | Third most positive cell voltage sense | Required only in 4-cell setups; enables individual monitoring of third cell |
| 4 (GND) | Analog ground reference | Common return for all sense inputs and internal circuitry; must be low-impedance |
| 5 (VC4) | Least positive cell voltage sense | Connects to bottom of stack (cell-to-ground node) in 2-, 3-, or 4-cell arrangements |
| 6 (CD) | Capacitor delay timer input | External capacitor sets overvoltage response delay; clamped to GND if event clears early |
| 7 (VDD) | Power supply input | Accepts 4–25 V; powers internal circuitry and provides bias for sense comparators |
| 8 (OUT) | Protection output signal | Open-drain compatible; transitions high to enable external NCH FET for fuse activation |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 4.55 V overvoltage threshold | Eliminates need for external resistor divider calibration; ensures consistent trip point across production units |
| Programmable delay via CD pin | Enables system-level timing coordination-e.g., allowing charger IC to respond before hardware fuse blow |
| High power supply ripple rejection | Maintains accurate sensing despite noisy battery rail conditions common in switching charger environments |
| Stable during pulse charge operation | Prevents false trips when fast transient voltage spikes occur during CC/CV charging phases |
| Differential input tolerance (±0.3 V) | Accommodates PCB trace resistance and contact voltage drops without compromising accuracy |
Applications
| Smartphone Battery Packs | Notebook Computer Battery Modules |
|---|---|
Use Scenario: Dual-protection architecture where primary protection is handled by fuel gauge IC and BQ29414DCTR serves as independent hardware backup. IC Role / Device Role / Timing Role: Second-level overvoltage detector that triggers irreversible fuse blow only after sustained >4.55 V per cell for ≥1.5 s. Use Value: Prevents thermal runaway even if primary protection fails, meeting IEC 62133 safety requirements for portable Li-ion systems. |
Use Scenario: Multi-cell (3S/4S) removable battery packs requiring robust, low-power secondary protection independent of host system firmware. IC Role / Device Role / Timing Role: Standalone analog monitor with no software dependency; senses VC1–VC4 directly from cell taps. Use Value: Enables certified safe hot-swap operation and extends field reliability by eliminating single-point failure modes in battery management. |
| Portable Medical Devices | Industrial Handheld Test Equipment |
Use Scenario: Battery-powered ECG monitors and infusion pumps where battery fault must be contained before patient risk arises. IC Role / Device Role / Timing Role: Hardware-enforced voltage cutoff with 320 mV hysteresis to prevent re-trip during recovery. Use Value: Meets ISO 13485 and IEC 60601-1 essential performance requirements for battery safety in Class II medical devices. |
Use Scenario: Ruggedized multimeters and oscilloscopes operating in variable ambient temperatures (–20°C to 60°C). IC Role / Device Role / Timing Role: Wide-temperature-range protector (–40°C to 110°C) with stable 4.55 V threshold across full range. Use Value: Guarantees consistent overvoltage response regardless of environmental stress, supporting MIL-STD-810G compliance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar secondary overvoltage protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BQ29413DCTR | 4.50 V overvoltage threshold (50 mV lower); identical pinout, package, and timing behavior | Suitable where tighter voltage margin is required before secondary cutoff, e.g., high-precision 4.2 V nominal cells | Select when system design targets 4.50 V trip instead of 4.55 V; no layout or firmware changes needed |
| BQ29415DCTR | 4.60 V overvoltage threshold (50 mV higher); same DCT package, CD-based delay, and temperature range | Used in high-voltage Li-ion chemistries (e.g., LiCoO₂ with extended upper limit) or conservative thermal derating schemes | Choose when higher trip voltage is mandated by cell vendor specifications or safety margin analysis |
Compared with BQ29414DCTR, BQ29413DCTR offers earlier intervention at 4.50 V for stricter voltage control, while BQ29415DCTR delays action until 4.60 V-enabling compatibility with wider-chemistry battery packs without altering PCB layout or protection logic timing.
Availability
BQ29414DCTR is available at Aetrix Electronics and suitable for notebook computer battery modules, portable medical instrumentation, and industrial handheld test equipment requiring stable component supply and long-term lifecycle support.
Supply support for BQ29414DCTR 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 experience in battery safety ICs.
The bq2941x family was designed specifically for second-level hardware protection in multi-cell Li-ion battery packs, delivering precision voltage monitoring and fuse-control capability without software dependency.
FAQ
What is the exact overvoltage protection threshold of the BQ29414DCTR?
The BQ29414DCTR has a fixed overvoltage protection threshold of 4.55 V per cell, with accuracy of ±50 mV over the full operating temperature range (–40°C to 110°C). This value is factory-trimmed and does not require external calibration. The BQ29414DCTR uses an internal reference to ensure consistent trip points across units and conditions, making it suitable for safety-critical battery pack designs.
How does the CD pin function in the BQ29414DCTR protection sequence?
The CD pin on the BQ29414DCTR connects to an external capacitor that sets the overvoltage detection delay time. When any monitored cell exceeds 4.55 V, a 0.18 µA current source charges the capacitor. Once the CD pin voltage reaches 1.2 V, the OUT pin transitions high to activate the external fuse-blow FET. If the overvoltage condition clears before 1.2 V is reached, the internal switch discharges the capacitor, preserving full delay for the next event.
Is the BQ29414DCTR pin-compatible with other devices in the bq2941x family?
Yes, the BQ29414DCTR is pin-compatible with all members of the bq2941x family in the DCT (MSOP-8) package, including BQ29410DCTR through BQ29419DCTR. All share identical pin assignments, electrical characteristics, and functional block diagrams-only the overvoltage threshold differs (4.30 V to 4.60 V). This allows direct substitution in existing layouts when adjusting protection voltage levels.
What is the recommended operating voltage range for VDD on the BQ29414DCTR?
The BQ29414DCTR supports a VDD supply voltage range of 4 V to 25 V, with recommended operation between 4 V and 25 V. It draws less than 2 µA quiescent current, enabling use directly from the battery stack without regulation. The wide input range accommodates both partially discharged and fully charged multi-cell Li-ion configurations, and the device remains functional even during transient overvoltage events up to 28 V absolute maximum rating.
Why is the BQ29414DCTR marked 'Not Recommended for New Designs'?
The BQ29414DCTR is designated 'Not Recommended for New Designs' (NRND) by Texas Instruments due to newer alternatives like the BQ77xx series offering enhanced integration, diagnostics, and qualification for automotive and industrial standards. However, the BQ29414DCTR remains in active production for legacy support, with full datasheet documentation, guaranteed supply, and unchanged electrical specifications-making it viable for cost-sensitive or maintenance-focused programs where redesign is impractical.
BQ29414DCTR 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:
- Obsolete
- 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
BQ29414DCTR FAQ
1.How can I place an order for BQ29414DCTR through Aetrix?
Please submit a Request for Quotation (RFQ) for BQ29414DCTR 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 BQ29414DCTR reliable?
The price and inventory of BQ29414DCTR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BQ29414DCTR is usually 5 days.
3.What payment methods are accepted for BQ29414DCTR?
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Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BQ29414DCTR?
BQ29414DCTR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BQ29414DCTR 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 BQ29414DCTR?
For technical support, including BQ29414DCTR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BQ29414DCTR requirements.
6.How does Aetrix verify that BQ29414DCTR is sourced from the original manufacturer or authorized distributors?
All BQ29414DCTR 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 BQ29414DCTR meets industry standards.
7.What is the process for return or replacement of BQ29414DCTR?
All BQ29414DCTR units undergo pre-shipment inspection (PSI). If there is an issue with BQ29414DCTR, 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 BQ29414DCTR part is unused and in its original packaging.
Return procedure for BQ29414DCTR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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