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Texas Instruments BQ29410PWR
- Part No.:
- BQ29410PWR
- Manufacturer:
- Texas Instruments
- Category:
- Battery Management
- Package:
- 8-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
BQ29410PWR.pdf
- Description:
- IC BATT PROT LI-ION 2-4CL 8TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,980
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Product details
Overview
BQ29410PWR 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, <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 the fuse upon overvoltage, and operates across –40°C to 110°C in portable instrumentation battery safety circuits.
For engineers reviewing the BQ29410PWR datasheet, BQ29410PWR pinout, BQ29410PWR application, or BQ29410PWR equivalent, this page delivers verified technical context, exact pin functions, real-world use scenarios in notebook and portable equipment battery packs, and validated alternative options with documented functional differences.
Technical Context
The BQ29410PWR implements precision voltage monitoring across up to four series-connected Li-ion cells using dedicated sense inputs (VC1–VC4), comparing each against an internal 4.35 V reference with ±25 mV accuracy at 25°C and ±80 mV over full temperature range. Its protection logic initiates only when any single cell exceeds threshold, triggering 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, enabling fuse blow in the positive battery rail. The device maintains stable operation during pulse charge and rejects high-frequency supply ripple without false triggering.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Overvoltage Threshold | 4.35 V per cell - precise trip point for second-level Li-ion cell overvoltage protection |
| Supply Current (ICC) | <2 µA - ultra-low quiescent power enables long-term battery pack standby without drain |
| Delay Time Programmability | Configurable via CD pin capacitor (e.g., 0.22 µF → 1.5 s typical) - allows tuning of response time to avoid nuisance trips |
| Operating Temperature | –40°C to 110°C - supports industrial and high-ambient portable equipment environments |
| Cell Input Range | 0 V to 25 V per VCx pin - accommodates full 4-cell stack (up to 17.4 V nominal) with margin |
| Overvoltage Hysteresis | 320 mV - ensures clean reset after fault clearance without oscillation near threshold |
| OUT Pin Drive | Open-drain, 1.5–2.5 V high-level at 40 µA - directly interfaces standard NCH gate drivers for fuse control |
Pinout & Package
TSSOP-8 (PW) package, 3.0 mm × 4.4 mm, 1.2 mm max height, RoHS-compliant, NIPDAU lead finish, MSL Level-2 (260°C peak reflow).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (VC1) | Sense input for most positive cell | Connects to top of battery stack; must be wired before VC2–VC4 to prevent false triggers |
| 2 (VC2) | Sense input for second most positive cell | Monitors voltage between first and second cell; requires sequential connection per datasheet |
| 3 (VC3) | Sense input for third most positive cell | Enables 3- or 4-cell monitoring; unused in 2-cell config (tied to VC2) |
| 4 (GND) | Analog and power ground reference | Common return for all sense inputs and internal circuitry; must be low-impedance |
| 5 (VC4) | Sense input for least positive cell | Connects to bottom of stack (cell 4 cathode or cell 1 anode in 4S); critical for differential sensing |
| 6 (CD) | Capacitor delay timing input | Charged by 0.18 µA current source; 1.2 V threshold determines overvoltage response delay |
| 7 (VDD) | Power supply input | Accepts 4 V to 25 V; powers internal circuitry and OUT driver; bypass with 0.1 µF capacitor |
| 8 (OUT) | Open-drain protection output | Drives external NCH FET gate; high = fault active; requires pull-up to VDD or battery voltage |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 4.35 V overvoltage threshold | Guaranteed ±25 mV accuracy at 25°C enables reliable second-level cell protection without calibration |
| Programmable overvoltage delay | External capacitor on CD pin sets delay from sub-second to multi-second - avoids false trips during transient spikes |
| Ultra-low ICC < 2 µA | Minimizes parasitic battery drain in always-connected safety circuits, extending shelf life |
| High ripple rejection | Stable operation under >100 mVpp supply noise - prevents mis-triggering in noisy battery management systems |
| Stable during pulse charge | Maintains accurate voltage comparison even with fast-rising charge pulses - essential for modern fast-charge protocols |
Applications
| Notebook Computer Battery Packs | Portable Instrumentation Power Systems |
|---|---|
Use Scenario: Secondary overvoltage protection in 3-cell Li-ion packs used in high-reliability test equipment. IC Role / Device Role / Timing Role: Monitors VC1–VC4 to detect individual cell overvoltage; asserts OUT after programmable delay to trigger fuse blow. Use Value: Prevents thermal runaway if primary protection fails, meeting IEC 62133 safety requirements for portable instruments. |
Use Scenario: Safety-critical backup power for handheld multimeters and oscilloscopes with 4-cell Li-ion stacks. IC Role / Device Role / Timing Role: Acts as independent hardware-based overvoltage guard, isolated from MCU-controlled BMS firmware. Use Value: Ensures fail-safe shutdown even during software crash or communication failure, preserving device integrity. |
| Medical Portable Diagnostic Devices | Industrial Handheld Scanners |
Use Scenario: 2-cell Li-ion battery pack in FDA-cleared point-of-care ultrasound devices requiring redundant safety layers. IC Role / Device Role / Timing Role: Configured in 2-cell mode (VC1=VC2=VC3=VDD); senses VC4–GND and VC1–VC2 differentials. Use Value: Provides certified second-level protection meeting UL 2054 and AAMI/IEC 60601-1 collateral standards. |
Use Scenario: Ruggedized barcode scanners operating in warehouses with wide ambient temperature swings (–20°C to 60°C). IC Role / Device Role / Timing Role: Performs continuous cell voltage monitoring across temperature range; OUT drives MOSFET-based disconnect. Use Value: Enables reliable operation at 110°C junction temperature, supporting extended runtime in hot environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar secondary overvoltage protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BQ29411PWR | 4.40 V overvoltage threshold (50 mV higher), same pinout and timing behavior | Used where tighter cell voltage tolerance permits higher trip point, e.g., newer NMC chemistries with wider safe voltage window | Select when system design allows 4.40 V per-cell limit and no PCB change is desired |
| BQ29419PWR | 4.30 V overvoltage threshold (50 mV lower), identical architecture and package | Deployed in LCO or high-sensitivity cells requiring earlier intervention to prevent cobalt oxide degradation | Choose for legacy LiCoO₂ cells or designs prioritizing maximum cycle life over peak capacity |
Compared with BQ29410PWR, BQ29411PWR raises the protection threshold for higher-voltage chemistries while BQ29419PWR lowers it for conservative aging mitigation - both retain identical delay programming, supply current, and thermal range, enabling drop-in replacement with only threshold recalibration.
Availability
BQ29410PWR is available at Aetrix Electronics and suitable for notebook computer battery packs, portable instrumentation power systems, and industrial handheld scanner designs requiring stable component supply with full lifecycle support and traceable sourcing.
Supply support for BQ29410PWR 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 delivering analog and embedded processing solutions, with leadership in power management and battery safety ICs.
The BQ29410PWR belongs to TI's bq2941x family of secondary overvoltage protection ICs, designed specifically for hardware-enforced, standalone cell-level safety in multi-cell Li-ion battery packs.
FAQ
What is the exact overvoltage protection threshold of the BQ29410PWR?
The BQ29410PWR has a fixed overvoltage protection threshold of 4.35 V per cell, with a typical accuracy of ±25 mV at 25°C and ±80 mV over the full –40°C to 110°C operating range. This value is factory-trimmed and non-adjustable, ensuring consistent second-level protection across production units without calibration.
How does the BQ29410PWR implement programmable delay time?
The BQ29410PWR uses an internal 0.18 µA current source to charge an external capacitor connected to the CD pin. When the CD voltage reaches 1.2 V, the OUT pin activates. 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. The BQ29410PWR requires no external clock or digital interface for this function.
Can the BQ29410PWR be used in a 2-cell Li-ion configuration?
Yes, the BQ29410PWR supports 2-cell configurations by connecting VC1, VC2, and VC3 together to the positive terminal of the top cell, and VC4 to the negative terminal of the bottom cell (GND). The device internally measures differential voltages (VC1–VC2, VC2–VC3, VC3–VC4, VC4–GND) and triggers if any exceeds 4.35 V - making it fully compatible with 2S, 3S, and 4S topologies.
What is the recommended external component for the CD pin on the BQ29410PWR?
Texas Instruments recommends a 0.22 µF ceramic capacitor (X7R or better) placed as close as possible to the CD pin and GND for standard 1.5 s delay. A 1 kΩ resistor in series with the capacitor is optional for ESD protection but not required for basic operation. The BQ29410PWR datasheet specifies CDELAY range of 0.22 µF to 1 µF for delays from ~1 s to ~5 s.
Does the BQ29410PWR require a separate power supply or draw from the battery stack?
The BQ29410PWR draws power from VDD, which may be connected directly to the battery stack's positive rail (up to 25 V) or to a regulated auxiliary supply. It does not require an isolated supply. With <2 µA quiescent current, the BQ29410PWR minimizes load on the monitored pack - critical for long-term storage and low-power standby modes in portable equipment.
BQ29410PWR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- 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
BQ29410PWR FAQ
1.How can I place an order for BQ29410PWR through Aetrix?
Please submit a Request for Quotation (RFQ) for BQ29410PWR 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 BQ29410PWR reliable?
The price and inventory of BQ29410PWR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BQ29410PWR is usually 5 days.
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BQ29410PWR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BQ29410PWR 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 BQ29410PWR?
For technical support, including BQ29410PWR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BQ29410PWR requirements.
6.How does Aetrix verify that BQ29410PWR is sourced from the original manufacturer or authorized distributors?
All BQ29410PWR 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 BQ29410PWR meets industry standards.
7.What is the process for return or replacement of BQ29410PWR?
All BQ29410PWR units undergo pre-shipment inspection (PSI). If there is an issue with BQ29410PWR, 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 BQ29410PWR part is unused and in its original packaging.
Return procedure for BQ29410PWR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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