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Texas Instruments BQ29414PW
- Part No.:
- BQ29414PW
- Manufacturer:
- Texas Instruments
- Category:
- Battery Management
- Package:
- 8-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
BQ29414PW.pdf
- Description:
- IC BATT PROT LI-ION 2-4CL 8TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,104
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Product details
Overview
BQ29414PW 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, and ultra-low 2 µA supply current. It monitors individual cell voltages (VC1–VC4), activates OUT high upon overvoltage detection, and drives external fuse-blowing circuitry in notebook and portable instrumentation systems.
For engineers reviewing the BQ29414PW datasheet, BQ29414PW pinout, BQ29414PW application, or BQ29414PW equivalent, this page delivers verified technical context, exact pin functions, real-world timing behavior, confirmed alternative options, and supply-chain readiness for legacy design support and field-replacement scenarios.
Technical Context
The BQ29414PW implements precision voltage monitoring across four differential sense inputs (VC1–VC4) with ±80 mV overvoltage detection accuracy over –40°C to 110°C. Its internal 0.18 µA current source charges an external capacitor on CD to generate a programmable delay before OUT activation.
Upon reaching 1.2 V at CD, OUT transitions high to trigger an external N-channel FET for fuse blowing; recovery occurs only after all cells fall below (V(PROTECT) – Vhys), where Vhys = 320 mV. The device maintains stable operation during pulse charging and rejects supply ripple without requiring external regulators.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| V(PROTECT) | 4.55 V - Fixed per-cell overvoltage trip point; determines fuse-blowing threshold in multi-cell Li-ion stacks. |
| ICC | < 2 µA - Ultra-low quiescent current enables long-term battery pack standby without significant self-discharge impact. |
| Vhys | 320 mV - Hysteresis prevents oscillation during recovery; ensures clean reset only after cell voltage drops to 4.23 V. |
| tD1 (CD = 0.22 µF) | 1–2 s - Programmable delay window allows system-level fault confirmation before irreversible fuse activation. |
| Operating Temp | –40°C to 110°C - Validated thermal range supports deployment in harsh environments including industrial portable equipment. |
| Input Voltage Range | 0–25 V on VC1–VC4 and VDD - Accommodates full 4S Li-ion stack (up to 16.8 V) plus margin for transient spikes. |
| OUT Drive | 1.5–2.5 V at 40 µA - Sufficient logic-level output to reliably drive gate of external NCH FET in fuse-control path. |
Pinout & Package
TSSOP-8 (PW) package: 3.0 mm × 4.4 mm body, 1.2 mm max height, 0.65 mm pitch, RoHS-compliant CU-NiPdAu finish, MSL Level-2-260°C-1 year.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (VC1) | Most positive cell voltage sense input | Connects to top of 4S stack (or shared with VDD in 2S/3S); sets reference for highest cell monitoring. |
| 2 (VC2) | Second most positive cell voltage sense input | Monitors voltage between first and second cell in series string; enables per-cell differential measurement. |
| 3 (VC3) | Third most positive cell voltage sense input | Enables independent monitoring of third cell in 4S configuration; required for accurate 4-cell balancing oversight. |
| 4 (GND) | Analog and power ground reference | Common return for all sense inputs and internal circuitry; must be low-impedance to avoid false trips. |
| 5 (VC4) | Least positive cell voltage sense input | Connects to bottom of stack (cell-to-ground); completes full 4-cell differential sensing chain. |
| 6 (CD) | Capacitor delay timing input | Accepts external capacitor (e.g., 0.22 µF) to set 1–2 s delay before OUT assertion; clamped to GND on reset. |
| 7 (VDD) | Power supply input | Operates from 4–25 V; powers internal comparator, timer, and output driver; may tie to VC1 in 4S config. |
| 8 (OUT) | Open-drain or push-pull output | Drives high (1.5–2.5 V @ 40 µA) to activate external fuse-control FET; transitions low after safe recovery. |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 4.55 V overvoltage threshold | Eliminates external resistor network calibration; guarantees consistent cell protection across production batches and temperature. |
| Programmable delay via CD pin | Enables system-level fault validation window (1–2 s typical) before irreversible fuse blow, reducing nuisance trips. |
| 2 µA supply current | Minimizes parasitic drain on battery pack during storage or idle, extending shelf life without compromising safety response. |
| 320 mV overvoltage hysteresis | Ensures clean, bounce-free recovery by requiring cell voltage to drop 320 mV below trip point before reset. |
| Stable under pulse charge | Maintains accurate voltage monitoring during high-dV/dt charging events, preventing premature or missed trips. |
| High ripple rejection | Rejects switching noise on VDD and sense lines, enabling reliable operation in electrically noisy portable power systems. |
Applications
| Notebook Computer Battery Packs | Portable Instrumentation Power Systems |
|---|---|
|
Use Scenario: 4-cell Li-ion battery pack in ultrabook with embedded fuel gauge and host-controlled charging. IC Role / Device Role / Timing Role: Secondary hardware-level overvoltage protector that operates independently of host MCU and fuel gauge IC. Use Value: Prevents thermal runaway if primary charger fails; triggers fuse blow within 2 seconds of sustained >4.55 V/cell condition. |
Use Scenario: Handheld multimeter with rechargeable 3S Li-ion pack used in field service environments. IC Role / Device Role / Timing Role: Standalone cell-voltage monitor providing fail-safe backup to software-based protection algorithms. Use Value: Guarantees shutdown before cell voltage exceeds safe limit even if firmware hangs or communication fails. |
| Medical Portable Diagnostic Devices | Industrial Handheld Data Collectors |
|
Use Scenario: Battery-powered ultrasound probe requiring certified safety redundancy for patient-critical operation. IC Role / Device Role / Timing Role: Independent hardware watchdog enforcing strict per-cell voltage ceiling as part of IEC 62366 risk control. Use Value: Meets secondary protection requirement for Class II medical devices by delivering deterministic <2 s response time. |
Use Scenario: Ruggedized warehouse scanner operating in wide ambient temperatures (–20°C to 60°C). IC Role / Device Role / Timing Role: Low-power voltage supervisor maintaining protection integrity during extended storage and intermittent use. Use Value: Draws only 2 µA continuously, preserving battery charge for >1 year in shelf-stock inventory without maintenance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar secondary overvoltage protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BQ29413PW | 4.50 V overvoltage threshold; otherwise identical pinout, timing, and package. | Suitable for 4.50 V–rated cells; requires revalidation of fuse timing and thermal margin in existing 4.55 V designs. | Select when migrating to lower-threshold cells or tightening protection margin without changing PCB layout. |
| BQ29415PW | 4.60 V overvoltage threshold; same 320 mV hysteresis and 2 µA ICC. | Used in higher-voltage Li-ion chemistries (e.g., LiCoO₂ with extended voltage range); delays fuse action slightly longer. | Choose for next-generation packs using 4.60 V max cells; verify compatibility with existing CD capacitor value. |
Compared with BQ29414PW, BQ29413PW offers tighter overvoltage control at 4.50 V for conservative cell management, while BQ29415PW extends headroom to 4.60 V for emerging high-voltage Li-ion variants-both retain identical timing, power, and interface behavior for drop-in evaluation.
Availability
BQ29414PW is available at Aetrix Electronics and suitable for notebook computer battery packs, portable instrumentation power systems, medical diagnostic devices, industrial handheld data collectors, and ruggedized field equipment requiring stable component supply for legacy design continuity and field-service replacement.
Supply support for BQ29414PW 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-enforced safety independent of system firmware-BQ29414PW implements the 4.55 V variant in TSSOP-8 packaging.
FAQ
What is the overvoltage protection threshold of the BQ29414PW?
The BQ29414PW has a fixed overvoltage protection threshold of 4.55 V per cell, specified across –40°C to 110°C with ±80 mV accuracy. This value is factory-trimmed and non-adjustable, ensuring consistent secondary protection behavior without external components. The BQ29414PW uses this threshold to initiate the CD pin delay timer and ultimately assert the OUT signal when any monitored cell exceeds 4.55 V.
How does the BQ29414PW implement programmable delay timing?
The BQ29414PW implements programmable delay via its CD pin, which sources a precise 0.18 µA current to charge an external capacitor. When the CD node reaches 1.2 V, the OUT pin transitions high. For a standard 0.22 µF capacitor, this yields a 1–2 s delay window. The BQ29414PW automatically discharges the CD capacitor through an internal switch if overvoltage clears before timeout, preserving full delay for subsequent events.
Is the BQ29414PW pin-compatible with other bq2941x variants?
Yes, the BQ29414PW is fully pin-compatible with all bq2941x family members in the PW (TSSOP-8) package, including BQ29410PW through BQ29419PW. All share identical pin assignments, electrical characteristics, and functional behavior-only the V(PROTECT) threshold differs. This allows direct substitution in existing layouts when adjusting protection voltage levels without redesign.
What is the recommended operating temperature range for the BQ29414PW?
The BQ29414PW is rated for continuous operation from –40°C to 110°C ambient temperature, validated per TI's recommended operating conditions. Its overvoltage detection accuracy degrades only to ±80 mV across this full range, and supply current remains below 2 µA. This makes the BQ29414PW suitable for demanding applications such as automotive-adjacent portable tools and industrial handhelds exposed to wide thermal swings.
Why is the BQ29414PW marked "Not Recommended for New Designs"?
The BQ29414PW is designated "Not Recommended for New Designs" (NRND) by Texas Instruments due to newer alternatives like the BQ77PL900 family offering enhanced integration, wider voltage ranges, and improved diagnostics. However, the BQ29414PW remains in active production for legacy support, with guaranteed supply for existing designs, field replacements, and maintenance programs requiring proven, qualification-ready components.
BQ29414PW Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tube
- 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
BQ29414PW FAQ
1.How can I place an order for BQ29414PW through Aetrix?
Please submit a Request for Quotation (RFQ) for BQ29414PW 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 BQ29414PW reliable?
The price and inventory of BQ29414PW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BQ29414PW is usually 5 days.
3.What payment methods are accepted for BQ29414PW?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BQ29414PW transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BQ29414PW?
BQ29414PW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BQ29414PW 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 BQ29414PW?
For technical support, including BQ29414PW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BQ29414PW requirements.
6.How does Aetrix verify that BQ29414PW is sourced from the original manufacturer or authorized distributors?
All BQ29414PW 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 BQ29414PW meets industry standards.
7.What is the process for return or replacement of BQ29414PW?
All BQ29414PW units undergo pre-shipment inspection (PSI). If there is an issue with BQ29414PW, 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 BQ29414PW part is unused and in its original packaging.
Return procedure for BQ29414PW:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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