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Texas Instruments BQ29414PWR
- Part No.:
- BQ29414PWR
- Manufacturer:
- Texas Instruments
- Category:
- Battery Management
- Package:
- 8-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
BQ29414PWR.pdf
- Description:
- IC BATT PROT LI-ION 2-4CL 8TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,730
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Product details
Overview
BQ29414PWR 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, programmable delay via external capacitor on CD pin, <2 µA supply current, and integrated high-accuracy voltage monitoring circuitry. It is used in notebook computers to prevent cell overcharge during charging cycles by triggering external fuse blow via OUT pin activation.
For engineers reviewing the BQ29414PWR datasheet, BQ29414PWR pinout, BQ29414PWR application, or BQ29414PWR equivalent, key selection considerations include its 4.55 V protection threshold, 8-pin TSSOP (PW) package, programmable delay timing, low quiescent current, and role as second-level safety device in multi-cell Li-ion battery management systems.
Technical Context
The BQ29414PWR implements precision per-cell voltage monitoring using internal reference comparison across VC1–VC4 inputs, with ±25 mV overvoltage detection accuracy at 25°C and ±50 mV over –20°C to 85°C. Its protection sequence initiates when any monitored cell exceeds 4.55 V, charging an external capacitor on CD until 1.2 V is reached, then asserting high on OUT.
It supports stable operation during pulse charging and rejects high-frequency supply ripple, with differential input voltage tolerance of 0–5 V between adjacent sense terminals (e.g., VC1–VC2) and absolute input range up to 25 V. The OUT pin drives an external N-channel FET to activate fuse-blowing circuitry in the battery pack's positive rail.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Overvoltage Threshold | 4.55 V per cell - fixed, factory-trimmed value enabling precise second-level overcharge cutoff for 4S Li-ion configurations. |
| Supply Current (ICC) | <2 µA - ultra-low quiescent draw ensures minimal self-discharge impact on battery pack standby life. |
| Delay Timing Control | Programmable via CD pin capacitor - 1.2 V threshold and 0.18 µA internal current source enable configurable delay (e.g., 1–2 s with 0.22 µF). |
| Operating Temperature | –40°C to 110°C - qualified for industrial and portable computing environments with extended thermal margin. |
| Input Voltage Range | 0–25 V on VC1/VC2/VC3/VC4 - supports full 4S Li-ion stack (up to ~16.8 V) with headroom for transient spikes. |
| Overvoltage Accuracy | ±25 mV at 25°C - enables tight voltage guardbanding without excessive derating in safety-critical battery protection. |
| Hysteresis | 320 mV - prevents oscillation during recovery by requiring cell voltage to drop to 4.23 V before OUT deasserts. |
Pinout & Package
TSSOP-8 (PW) package: 3.0 mm × 4.4 mm body, 1.2 mm max height, 0.65 mm pitch, lead-free (RoHS-compliant), moisture sensitivity level 1 (260°C peak reflow).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (VC1) | Most positive cell voltage sense input | Connects to top of battery stack (e.g., 4S+); must be wired before VC2–VC4 to avoid false triggers. |
| 2 (VC2) | Second most positive cell voltage sense input | Monitors voltage between cells 3 and 4 in 4S configuration; differential tolerance limits miswiring risk. |
| 3 (VC3) | Third most positive cell voltage sense input | Used in 3S/4S configs; tied to VC2 in 2S mode per TI application guidance. |
| 4 (GND) | Analog ground reference | Common return for all sense inputs and internal circuitry; requires low-impedance PCB connection. |
| 5 (VC4) | Least positive cell voltage sense input | Connects to bottom of stack (e.g., 4S– or 2S–); referenced to GND; supports 2S–4S flexibility. |
| 6 (CD) | Capacitor delay timing input | Charged by 0.18 µA current source; 1.2 V trip point sets overvoltage response latency (e.g., 1.22 s @ 0.22 µF). |
| 7 (VDD) | Power supply input | Accepts 4–25 V; powers internal circuitry; decoupling with 0.1 µF CVD recommended near pin. |
| 8 (OUT) | Protection output driver | Open-drain high-side output; sinks ≤5 µA low-state current; drives gate of external N-FET to blow fuse. |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 4.55 V overvoltage threshold | Enables precise, repeatable second-level cutoff matching JEITA and IEC 62133 requirements for 4S Li-ion packs. |
| Programmable delay via CD pin | Allows system designers to tune response time (1–2 s typical) to avoid nuisance trips during transient voltage spikes. |
| Low 2 µA supply current | Minimizes parasitic drain on battery during storage or idle, extending shelf life without compromising protection speed. |
| High ripple rejection | Rejects >60 dB of switching noise from DC-DC chargers, ensuring reliable sensing under noisy power conditions. |
| Stable during pulse charge | Maintains accurate voltage monitoring even during high-current intermittent charging pulses common in fast-charge protocols. |
Applications
| Notebook Computers | Portable Instrumentation |
|---|---|
Use Scenario: Multi-cell Li-ion battery pack in ultrabook platform undergoing CC/CV charging with potential for voltage overshoot. IC Role / Device Role / Timing Role: Secondary overvoltage protector that activates only if primary charger fails, asserting OUT after programmable delay to blow fuse. Use Value: Prevents thermal runaway by cutting off charge path at 4.55 V/cell - tighter than typical 4.6 V primary cutoff, adding safety margin. |
Use Scenario: Handheld multimeter or gas analyzer with removable 3S Li-ion battery subjected to field charging in variable ambient temperatures. IC Role / Device Role / Timing Role: Standalone voltage monitor providing redundant overvoltage lockout independent of host MCU firmware. Use Value: Ensures fail-safe operation across –40°C to 110°C ambient, with ±50 mV accuracy maintaining protection integrity at temperature extremes. |
| Portable Medical Devices | Industrial Handheld Terminals |
Use Scenario: Battery-powered ECG monitor requiring certified safety compliance and zero risk of cell overcharge during overnight charging. IC Role / Device Role / Timing Role: Hardware-enforced second-level protection layer, physically isolated from charging IC and host processor. Use Value: Meets IEC 62368-1 Annex D requirements for redundant overvoltage protection with deterministic 1.2 V CD threshold. |
Use Scenario: Ruggedized warehouse scanner with hot-swappable 4S battery packs exposed to vibration and wide temperature swings. IC Role / Device Role / Timing Role: Cell-balancing-agnostic protector that monitors individual cell voltages without requiring active balancing circuitry. Use Value: Supports 2S–4S configurations via pin-strapping (e.g., VC1=VC2 for 3S), reducing BOM count across product variants. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar secondary overvoltage protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BQ29413PWR | 4.50 V overvoltage threshold; otherwise identical pinout, timing, and accuracy specs. | Suitable for 4S packs where lower threshold reduces risk of false trips during high-temp charging but sacrifices margin vs. 4.55 V. | Select BQ29413PWR if design targets 4.50 V compliance (e.g., legacy OEM spec); verify thermal derating aligns with pack voltage profile. |
| BQ29415PWR | 4.60 V overvoltage threshold; same package, quiescent current, and delay architecture. | Used where higher threshold accommodates wider cell variance or elevated temperature coefficients in high-reliability industrial packs. | Choose BQ29415PWR only if cell chemistry and aging model confirm safe operation up to 4.60 V; not recommended for consumer-grade cells. |
Compared with BQ29414PWR, BQ29413PWR offers earlier intervention at 4.50 V for conservative designs, while BQ29415PWR delays action until 4.60 V-requiring tighter cell matching and thermal control but enabling higher usable capacity in stable environments.
Availability
BQ29414PWR is available at Aetrix Electronics and suitable for notebook computers, portable instrumentation, portable medical devices, and industrial handheld terminals requiring stable component supply for safety-critical Li-ion battery protection.
Supply support for BQ29414PWR 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 over 50 years of innovation 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 charger ICs in portable and industrial applications.
FAQ
What is the exact overvoltage protection threshold of the BQ29414PWR?
The BQ29414PWR has a fixed, factory-trimmed overvoltage protection threshold of 4.55 V per cell, specified with ±25 mV accuracy at 25°C and ±50 mV over –20°C to 85°C. This value is unique to the BQ29414PWR within the bq2941x family and is not user-adjustable. The BQ29414PWR uses this precise threshold to enforce second-level safety cutoff in 2S–4S Li-ion battery packs.
How does the BQ29414PWR implement programmable delay timing?
The BQ29414PWR implements programmable delay via its CD pin, which sources a precise 0.18 µA current to charge an external capacitor. When the CD pin voltage reaches 1.2 V, the OUT pin asserts high. Delay time is calculated as tD = (1.2 V × CDELAY) / 0.18 µA - for example, 0.22 µF yields ~1.22 s. This mechanism is integral to the BQ29414PWR's function as a robust, noise-immune overvoltage detector.
Is the BQ29414PWR pin-compatible with other devices in the bq2941x family?
Yes, the BQ29414PWR is pin-compatible with all bq2941x variants (e.g., BQ29410PWR, BQ29413PWR) in both TSSOP (PW) and MSOP (DCT) packages. All share identical 8-pin assignments, electrical characteristics, and functional behavior - differing only in overvoltage threshold (4.30–4.60 V). This allows direct substitution in existing layouts when updating protection levels, provided the BQ29414PWR's 4.55 V threshold meets system requirements.
What package options are available for the BQ29414PWR?
The BQ29414PWR is offered exclusively in the TSSOP-8 (PW) package: 3.0 mm × 4.4 mm body, 1.2 mm max height, 0.65 mm pitch, RoHS-compliant, MSL Level-1 (260°C). It is not available in MSOP (DCT). The PW package provides better thermal dissipation (525 mW at 25°C) than DCT and is optimized for automated assembly in high-volume portable electronics manufacturing - a key attribute of the BQ29414PWR's target use cases.
Why is the BQ29414PWR marked "Not Recommended for New Designs"?
Texas Instruments classifies the BQ29414PWR as "NRND" due to newer alternatives like the BQ77PL900 family offering enhanced integration (e.g., integrated FET drivers, daisy-chain capability). However, the BQ29414PWR remains in active production with full datasheet support, qualified for –40°C to 110°C, and widely deployed in legacy and cost-sensitive designs. Its NRND status reflects roadmap direction, not obsolescence - the BQ29414PWR continues to meet safety and performance requirements for many 2S–4S battery applications.
BQ29414PWR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-TSSOP (0.173", 4.40mm 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:
- 8-TSSOP
BQ29414PWR FAQ
1.How can I place an order for BQ29414PWR through Aetrix?
Please submit a Request for Quotation (RFQ) for BQ29414PWR 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 BQ29414PWR reliable?
The price and inventory of BQ29414PWR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BQ29414PWR is usually 5 days.
3.What payment methods are accepted for BQ29414PWR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BQ29414PWR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BQ29414PWR?
BQ29414PWR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BQ29414PWR 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 BQ29414PWR?
For technical support, including BQ29414PWR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BQ29414PWR requirements.
6.How does Aetrix verify that BQ29414PWR is sourced from the original manufacturer or authorized distributors?
All BQ29414PWR 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 BQ29414PWR meets industry standards.
7.What is the process for return or replacement of BQ29414PWR?
All BQ29414PWR units undergo pre-shipment inspection (PSI). If there is an issue with BQ29414PWR, 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 BQ29414PWR part is unused and in its original packaging.
Return procedure for BQ29414PWR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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