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Texas Instruments BQ29414DCTT
- Part No.:
- BQ29414DCTT
- Manufacturer:
- Texas Instruments
- Category:
- Battery Management
- Package:
- 8-LSSOP, 8-MSOP (0.110", 2.80mm Width)
- Datasheet:
-
BQ29414DCTT.pdf
- Description:
- IC BATT PROT LI-ION 2-4CELL SM8
- Quantity:
- Payment:
- Shipping:
Inventory:2,736
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Product details
Overview
BQ29414DCTT from Texas Instruments is a secondary overvoltage protection IC for 2-, 3-, or 4-cell Li-ion battery packs, featuring fixed 4.55 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), drives an external N-channel FET to blow a fuse upon overvoltage, and operates across –40°C to 110°C.
For engineers reviewing the BQ29414DCTT datasheet, BQ29414DCTT pinout, BQ29414DCTT application, or BQ29414DCTT equivalent, this page delivers verified technical context, exact pin functions, real-world use scenarios in portable instrumentation and notebook computers, and validated alternative parts with documented functional differences.
Technical Context
The BQ29414DCTT implements precision voltage monitoring across up to four series-connected Li-ion cells using dedicated sense inputs (VC1–VC4), comparing each against an internal 4.55 V reference with ±80 mV accuracy over –40°C to 110°C. Its output activation sequence is triggered only when any single cell exceeds V(PROTECT), initiating a controlled delay via CD pin charging.
It features high power supply ripple rejection and stable operation during pulse charge conditions, with OUT pin capable of driving ≥–1 mA high-level current and ≤5 µA low-level sink. The device uses a dedicated GND reference and supports configurable cell configurations (2S/3S/4S) via specific VC pin connection sequences.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Overvoltage Threshold | 4.55 V per cell - fixed, factory-trimmed value enabling precise second-level protection without external adjustment. |
| Supply Current (ICC) | <2 µA at 25°C - ultra-low quiescent current preserves battery standby life in always-on protection circuits. |
| Overvoltage Accuracy | ±80 mV over –40°C to 110°C - ensures reliable trip point across industrial temperature range without calibration. |
| Delay Time Programmability | Set by external capacitor on CD pin - 1.2 V threshold and 0.18 µA current source enable predictable tD = (1.2 V × CDELAY) / 0.18 µA. |
| Operating Temperature | –40°C to 110°C - supports deployment in demanding portable and industrial battery pack environments. |
| Input Voltage Range (VCn) | 0 V to 25 V - accommodates full 4-cell Li-ion stack (up to ~16.8 V) with margin for transient spikes. |
| OUT Pin Drive Capability | ≥–1 mA high-level source at VDD = 14 V - sufficient to directly drive gate of external NCH FET for fuse-blowing action. |
Pinout & Package
Package: SSOP-8 (DCT), 3.95 mm × 4.25 mm × 1.3 mm body, 0.65 mm lead pitch, RoHS-compliant NiPdAu finish, MSL Level-1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (VC1) | Most positive cell voltage sense input | Connects to top of battery stack; highest potential node in 2S/3S/4S configuration. |
| 2 (VC2) | Second most positive cell voltage sense input | Monitors voltage between first and second cell in series string; critical for balanced 3S/4S detection. |
| 3 (VC3) | Third most positive cell voltage sense input | Required for 4S operation; enables independent monitoring of third cell in stack. |
| 4 (GND) | Ground reference terminal | System ground return for all internal comparators and bias circuitry; must be low-impedance path. |
| 5 (VC4) | Least positive (bottom) cell voltage sense input | Connects to bottom of stack (cell-to-GND); completes full per-cell monitoring for 4S systems. |
| 6 (CD) | Capacitor delay timing input | Charged by internal 0.18 µA current source; reaches 1.2 V to trigger OUT high after programmable delay. |
| 7 (VDD) | Power supply input | Accepts 4 V to 25 V; powers internal circuitry and provides reference for OUT driver stage. |
| 8 (OUT) | Protection output signal | Open-drain compatible output; transitions high to activate external NCH FET and blow fuse in positive rail. |
Key Features
| Feature | Design Value |
|---|---|
| Fixed high-accuracy overvoltage threshold | 4.55 V per cell with ±80 mV max error over full temperature range - eliminates need for trimming or calibration in production. |
| Ultra-low power consumption | <2 µA ICC - extends battery shelf life and enables use in low-power backup systems without significant drain. |
| Programmable overvoltage detection delay | Configurable via external CD capacitor - prevents false trips during transient overvoltages while ensuring fast response to sustained faults. |
| High ripple rejection and pulse-charge stability | Stable operation under noisy supply and pulsed charging waveforms - maintains protection integrity in real-world charger environments. |
| Multi-cell configuration support | Validated for 2S, 3S, and 4S Li-ion stacks via defined VC pin interconnection schemes - simplifies design reuse across product families. |
Applications
| Portable Instrumentation | Notebook Computers |
|---|---|
Use Scenario: Handheld multimeters and portable gas analyzers require fail-safe battery protection during field use with variable ambient temperatures and infrequent charging cycles. IC Role / Device Role / Timing Role: Secondary overvoltage protector that activates only after primary protection fails, providing last-resort cell voltage clamping before thermal runaway. Use Value: Prevents catastrophic cell venting or fire by blowing fuse within seconds of sustained >4.55 V per cell, even at –40°C or 110°C ambient. |
Use Scenario: High-performance ultrabooks use 3- or 4-cell Li-ion packs with aggressive fast-charging algorithms that risk localized overvoltage during dynamic load transients. IC Role / Device Role / Timing Role: Independent hardware-based overvoltage monitor operating outside main system controller domain, ensuring protection remains active during firmware crashes or sleep states. Use Value: Guarantees shutdown before cell voltage exceeds safe limit, preserving battery cycle life and user safety without relying on software supervision. |
| Medical Portable Devices | Industrial Handheld Terminals |
Use Scenario: Battery-powered ECG monitors and infusion pumps operate in clinical settings where battery failure could impact patient safety and regulatory compliance. IC Role / Device Role / Timing Role: Redundant hardware protection layer meeting IEC 62368-1 and UL 2054 requirements for secondary overvoltage cutoff. Use Value: Delivers certified, deterministic response time (<2 s with 0.22 µF CD cap) independent of host MCU, satisfying functional safety validation needs. |
Use Scenario: Ruggedized warehouse scanners and inventory terminals undergo repeated drop testing and operate in wide-temperature warehouses (-20°C to 60°C). IC Role / Device Role / Timing Role: Robust cell-level voltage supervisor tolerant to mechanical shock-induced voltage spikes and wide ambient swings. Use Value: Maintains ±80 mV overvoltage accuracy across full –40°C to 110°C range, preventing nuisance trips during cold storage or hot loading docks. |
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; otherwise identical architecture, pinout, and timing behavior. | Suitable for battery chemistries or chargers with lower maximum cell voltage tolerance. | Select BQ29413DCTR when system-level validation requires 4.50 V trip point instead of 4.55 V. |
| BQ29415DCTT | 4.60 V overvoltage threshold; same DCT package, temperature rating, and ultra-low ICC. | Used in higher-voltage Li-ion variants or legacy charger designs with wider voltage margins. | Choose BQ29415DCTT only if battery specification explicitly permits 4.60 V per-cell ceiling. |
Compared with BQ29414DCTT, BQ29413DCTR offers a 50 mV lower trip point for tighter voltage control, while BQ29415DCTT raises the threshold by 50 mV for compatibility with less stringent charger profiles - both retain identical delay programming, power consumption, and thermal performance.
Availability
BQ29414DCTT is available at Aetrix Electronics and suitable for notebook computers, portable instrumentation, and medical portable devices requiring stable component supply with guaranteed long-term traceability and lifecycle management.
Supply support for BQ29414DCTT 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 company headquartered in Dallas, Texas, delivering analog and embedded processing solutions for industrial, automotive, and personal electronics markets.
The bq2941x family was designed specifically for secondary overvoltage protection in multi-cell Li-ion battery packs, addressing the need for autonomous, low-power, high-accuracy hardware-based safety layers beyond primary protection ICs.
FAQ
What is the exact overvoltage protection threshold of the BQ29414DCTT?
The BQ29414DCTT has a fixed, factory-trimmed overvoltage protection threshold of 4.55 V per cell, specified with ±80 mV accuracy over the full –40°C to 110°C operating temperature range. This value is not adjustable and applies uniformly to all monitored cells (VC1–VC4) in the battery string.
How does the BQ29414DCTT implement programmable delay time?
The BQ29414DCTT uses an internal 0.18 µA current source to charge an external capacitor connected to the CD pin. When the voltage at CD reaches 1.2 V, the OUT pin transitions high. Delay time is calculated as tD = (1.2 V × CDELAY) / 0.18 µA - for example, a 0.22 µF capacitor yields ~1.5 s typical delay.
Can the BQ29414DCTT be used in a 2-cell Li-ion configuration?
Yes, the BQ29414DCTT supports 2-cell configurations by connecting VC1 = VC2 = VDD and VC3 = VC4, with GND referenced to the bottom cell. The datasheet defines exact connection sequences to prevent false triggering, and all electrical specifications remain valid in 2S mode.
What is the maximum continuous supply voltage for the BQ29414DCTT?
The BQ29414DCTT supports a VDD supply voltage range of –0.3 V to 28 V, with recommended operation from 4 V to 25 V. This wide range accommodates fully charged 4-cell Li-ion stacks (~16.8 V) plus headroom for transient surges and charger overshoot without external regulation.
Does the BQ29414DCTT require external passive components for basic operation?
Yes - the BQ29414DCTT requires an external capacitor on the CD pin to set overvoltage delay time, and may need RC filters (RIN/CIN) on VC pins and (RVD/CVD) on VDD for noise immunity in electrically noisy battery pack environments. No external resistors are needed for threshold setting, as it is factory-trimmed.
BQ29414DCTT 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:
- Discontinued at Digi-Key
- 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
BQ29414DCTT FAQ
1.How can I place an order for BQ29414DCTT through Aetrix?
Please submit a Request for Quotation (RFQ) for BQ29414DCTT 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 BQ29414DCTT reliable?
The price and inventory of BQ29414DCTT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BQ29414DCTT is usually 5 days.
3.What payment methods are accepted for BQ29414DCTT?
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4.How is shipping managed for BQ29414DCTT?
BQ29414DCTT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BQ29414DCTT 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 BQ29414DCTT?
For technical support, including BQ29414DCTT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BQ29414DCTT requirements.
6.How does Aetrix verify that BQ29414DCTT is sourced from the original manufacturer or authorized distributors?
All BQ29414DCTT 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 BQ29414DCTT meets industry standards.
7.What is the process for return or replacement of BQ29414DCTT?
All BQ29414DCTT units undergo pre-shipment inspection (PSI). If there is an issue with BQ29414DCTT, 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 BQ29414DCTT part is unused and in its original packaging.
Return procedure for BQ29414DCTT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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