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Texas Instruments BQ29410PW
- Part No.:
- BQ29410PW
- Manufacturer:
- Texas Instruments
- Category:
- Battery Management
- Package:
- 8-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
BQ29410PW.pdf
- Description:
- IC BATT PROT LI-ION 2-4CL 8TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,633
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Product details
Overview
BQ29410PW from Texas Instruments is a secondary overvoltage protection IC for 2-, 3-, or 4-cell Li-ion battery packs, featuring fixed 4.35 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), drives an external N-channel FET to blow a fuse upon overvoltage, and operates across –40°C to 110°C - used in notebook computer battery packs requiring redundant safety protection.
For engineers reviewing the BQ29410PW datasheet, BQ29410PW pinout, BQ29410PW application, or BQ29410PW equivalent, this page delivers verified technical context, exact pin functions, real-world use scenarios, and validated alternative parts - all grounded in TI's SLUS669G datasheet and official packaging data for the TSSOP-8 (PW) variant.
Technical Context
The BQ29410PW implements precision voltage monitoring across four differential sense inputs (VC1–VC4), comparing each cell voltage against an internal 4.35 V reference with ±50 mV accuracy over –20°C to 85°C. Its protection logic triggers only when any single cell exceeds threshold, initiating a controlled delay via CD pin current source (0.18 µA) charging an external capacitor.
Upon CD pin voltage reaching 1.2 V, the open-drain OUT pin transitions high to activate an external NCH FET; recovery occurs only after all cells fall below (4.35 V – Vhys), where hysteresis is 320 mV. The device maintains stable operation during pulse charging and rejects supply ripple without external filtering.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Overvoltage Threshold | 4.35 V per cell - fixed, factory-trimmed value enabling precise second-level protection for Li-ion stacks. |
| Supply Current (ICC) | < 2 µA - enables always-on monitoring without significant battery drain in standby mode. |
| CD Pin Current Source | 0.18 µA - sets programmable delay time (tD = 1.2 V × CDELAY / 0.18 µA) for configurable response timing. |
| Overvoltage Accuracy | ±50 mV (TA = –20°C to 85°C) - ensures reliable trip point across industrial temperature range. |
| Operating Temperature | –40°C to 110°C - supports deployment in high-thermal-stress battery pack environments. |
| Output Type | Open-drain OUT - directly interfaces with standard N-channel MOSFETs for fuse-blowing control path. |
| Input Voltage Range | VCn pins: 0–25 V; differential cell voltage: 0–5 V - accommodates full Li-ion cell voltage swing plus margin. |
Pinout & Package
TSSOP-8 (PW) package, 3.0 mm × 4.4 mm body, 0.65 mm lead pitch, 1.2 mm max height, RoHS-compliant NiPdAu lead finish, MSL Level-1 (260°C).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (VC1) | Sense input for most positive cell | Connects to top of battery stack; highest voltage node in series configuration. |
| 2 (VC2) | Sense input for second most positive cell | Monitors voltage between first and second cell in 3- or 4-cell packs. |
| 3 (VC3) | Sense input for third most positive cell | Required for 4-cell configurations; enables per-cell monitoring across full stack. |
| 4 (GND) | Ground reference | System ground return for all internal circuits and voltage references. |
| 5 (VC4) | Sense input for least positive cell | Connects to bottom of stack (cell 1 anode); completes differential sensing chain. |
| 6 (CD) | Capacitor delay timer input | External capacitor sets overvoltage response delay; internal 0.18 µA current source charges it. |
| 7 (VDD) | Power supply input | Accepts 4–25 V; powers internal circuitry and bias networks independent of battery topology. |
| 8 (OUT) | Open-drain protection output | Drives external NCH FET gate; high-impedance until overvoltage event, then pulls high to activate fuse blow. |
Key Features
| Feature | Design Value |
|---|---|
| Fixed high-accuracy overvoltage threshold | 4.35 V ±50 mV (–20°C to 85°C) - eliminates calibration overhead and ensures consistent safety margin. |
| Programmable overvoltage detection delay | Configurable via external CD capacitor (e.g., 0.22 µF → ~1.5 s delay) - prevents nuisance trips during transient spikes. |
| Ultra-low quiescent current | <2 µA ICC - extends shelf life and reduces self-discharge impact in long-term storage applications. |
| High power supply ripple rejection | No external supply filter required - simplifies PCB layout and reduces BOM count in space-constrained battery modules. |
| Stable during pulse charge operation | Maintains accurate cell voltage measurement even under high dv/dt charging conditions - critical for fast-charge systems. |
Applications
| Smartphone Battery Packs | Notebook Computer Battery Modules |
|---|---|
Use Scenario: Secondary overvoltage protection in multi-cell Li-ion packs subjected to fast charging and thermal cycling. IC Role / Device Role / Timing Role: Monitors VC1–VC4 independently; triggers OUT after programmable delay if any cell exceeds 4.35 V. Use Value: Prevents thermal runaway by blowing fuse before cell voltage reaches hazardous levels, complementing primary protection ICs. |
Use Scenario: Redundant safety layer in OEM notebook battery packs certified to UL 2054 and IEC 62133. IC Role / Device Role / Timing Role: Acts as hardware-enforced backup to system MCU-based protection; operates autonomously without firmware. Use Value: Ensures fail-safe shutdown even if host controller fails or software hangs during charging cycles. |
| Portable Medical Devices | Industrial Handheld Test Equipment |
Use Scenario: Battery-powered diagnostic tools requiring medical-grade reliability and zero false-trigger risk. IC Role / Device Role / Timing Role: Provides deterministic overvoltage response with 320 mV hysteresis to prevent oscillation near trip point. Use Value: Meets IEC 60601-1 collateral standard for battery safety in Class II devices with double insulation. |
Use Scenario: Ruggedized field instruments operating in wide ambient temperatures (–40°C to 70°C). IC Role / Device Role / Timing Role: Senses cell voltages across 2–4 series configurations; supports both 3-cell and 4-cell pack variants on same PCB. Use Value: Enables single-design flexibility across product SKUs while maintaining certified safety 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 |
|---|---|---|---|
| BQ29411PW | 4.40 V overvoltage threshold (50 mV higher); otherwise identical pinout, timing, and specs. | Used where tighter cell balancing allows higher trip point without compromising safety margin. | Select when battery chemistry or pack design tolerates elevated protection threshold. |
| BQ29419PW | 4.30 V overvoltage threshold (50 mV lower); same package, temperature range, and functional architecture. | Deployed in conservative designs using older Li-ion cells with lower maximum voltage tolerance. | Choose for legacy cell chemistries or applications requiring wider safety margin below 4.35 V. |
Compared with BQ29410PW, BQ29411PW raises protection voltage for improved charge utilization, while BQ29419PW lowers it for enhanced margin with aging cells - both retain identical delay programming, low-power operation, and TSSOP-8 footprint.
Availability
BQ29410PW is available at Aetrix Electronics and suitable for notebook computers, portable instrumentation, and portable equipment requiring stable component supply with guaranteed long-term lifecycle support.
Supply support for BQ29410PW 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 solutions with emphasis on reliability and industrial-grade performance.
The BQ2941x family was designed specifically for secondary overvoltage protection in multi-cell Li-ion battery packs, targeting applications where autonomous, hardware-based safety redundancy is mandatory.
FAQ
What is the overvoltage protection threshold of the BQ29410PW?
The BQ29410PW has a fixed overvoltage protection threshold of 4.35 V per cell, specified with ±50 mV accuracy over –20°C to 85°C. This value is factory-trimmed and non-adjustable, ensuring consistent second-level protection behavior across production units without calibration.
How does the BQ29410PW implement programmable delay for overvoltage detection?
The BQ29410PW uses an internal 0.18 µA current source to charge an external capacitor connected to the CD pin. Delay time is calculated as tD = (1.2 V × CDELAY) / 0.18 µA - for example, a 0.22 µF capacitor yields ~1.5 s delay. The OUT pin activates only after CD reaches 1.2 V.
Can the BQ29410PW be used in 2-cell battery configurations?
Yes, the BQ29410PW supports 2-, 3-, and 4-cell Li-ion configurations. For 2-cell use, VC1 and VC2 are tied together at the top of the stack, VC3 is connected to the mid-point, and VC4 to the bottom - full pin functionality remains active with no reconfiguration needed.
What is the operating temperature range of the BQ29410PW?
The BQ29410PW operates across –40°C to 110°C ambient temperature, validated per TI's SLUS669G datasheet. This range covers demanding environments including automotive cabin modules, industrial handhelds, and high-power portable equipment battery packs.
Does the BQ29410PW require external passive components for basic operation?
Yes - a minimum external CD capacitor is required to set overvoltage delay time, and recommended RC filters (RIN/CIN on VC pins, RVD/CVD on VDD) improve noise immunity. No external voltage reference or op-amps are needed, as all sensing and reference circuitry is integrated within the BQ29410PW.
BQ29410PW Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Bulk
- 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:
- 8-TSSOP
BQ29410PW FAQ
1.How can I place an order for BQ29410PW through Aetrix?
Please submit a Request for Quotation (RFQ) for BQ29410PW 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 BQ29410PW reliable?
The price and inventory of BQ29410PW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BQ29410PW is usually 5 days.
3.What payment methods are accepted for BQ29410PW?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BQ29410PW transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BQ29410PW?
BQ29410PW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BQ29410PW 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 BQ29410PW?
For technical support, including BQ29410PW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BQ29410PW requirements.
6.How does Aetrix verify that BQ29410PW is sourced from the original manufacturer or authorized distributors?
All BQ29410PW 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 BQ29410PW meets industry standards.
7.What is the process for return or replacement of BQ29410PW?
All BQ29410PW units undergo pre-shipment inspection (PSI). If there is an issue with BQ29410PW, 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 BQ29410PW part is unused and in its original packaging.
Return procedure for BQ29410PW:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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