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Texas Instruments BQ29415PW
- Part No.:
- BQ29415PW
- Manufacturer:
- Texas Instruments
- Category:
- Battery Management
- Package:
- 8-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
BQ29415PW.pdf
- Description:
- IC BATT PROT LI-ION 2-4CL 8TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,563
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Product details
Overview
BQ29415PW from Texas Instruments is a secondary overvoltage protection IC for 2-, 3-, or 4-cell Li-ion battery packs, providing fixed 4.60 V per-cell overvoltage detection with ±80 mV accuracy over –40°C to 110°C, programmable delay via external capacitor on CD pin, and low 2 µA supply current. It drives an external N-channel FET to blow a fuse during overvoltage events in notebook battery management systems.
For engineers reviewing the BQ29415PW datasheet, BQ29415PW pinout, BQ29415PW application, or BQ29415PW equivalent, this page delivers verified technical context, validated pin functions, confirmed operating parameters, and real-world implementation guidance for second-level cell protection design.
Technical Context
The BQ29415PW monitors individual cell voltages (VC1–VC4) against a precision internal reference and initiates protection when any cell exceeds 4.60 V. Its internal current source (0.18 µA) charges an external capacitor on the CD pin; activation occurs when CD voltage reaches 1.2 V, triggering the open-drain OUT pin high.
It features 320 mV overvoltage hysteresis, supports up to 25 V input on all sense pins, maintains stable operation during pulse charging, and rejects supply ripple without external filtering. The device operates across –40°C to 110°C ambient and draws ≤2.5 µA at 2.3 V cell stack voltage.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Overvoltage Threshold | 4.60 V per cell - fixed, factory-trimmed threshold for BQ29415 variant; enables precise secondary cutoff before cell damage. |
| Overvoltage Accuracy | ±80 mV over –40°C to 110°C - ensures reliable trip point across full industrial temperature range without calibration. |
| Supply Current (ICC) | ≤2.5 µA at 2.3 V stack - ultra-low quiescent power preserves battery standby life in always-connected protection circuits. |
| Delay Time Programmability | Configured via CD pin capacitor (e.g., 0.22 µF → 1–2 s delay) - allows system-level tuning of response time to avoid nuisance trips. |
| Operating Temperature | –40°C to 110°C - supports deployment in high-thermal-stress environments like laptop battery packs and portable instrumentation. |
| Input Voltage Range | VC1–VC4: 0–25 V; differential sense: 0–5 V - accommodates full 4-cell Li-ion stack (up to 18.4 V) with margin for transients. |
| Hysteresis | 320 mV - prevents oscillation during recovery by requiring cell voltage to drop to 4.28 V before OUT deactivates. |
Pinout & Package
TSSOP-8 (PW) package: 3.0 mm × 4.4 mm, 1.2 mm max height, lead pitch 0.65 mm, RoHS-compliant NiPdAu finish, MSL Level-2-260°C-1 year.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (VC1) | Most positive cell voltage sense | Connects to top of battery stack; highest potential node in multi-cell monitoring chain. |
| 2 (VC2) | Second most positive cell voltage sense | Monitors voltage between first and second cell in series string; enables per-cell differential measurement. |
| 3 (VC3) | Third most positive cell voltage sense | Supports 3- and 4-cell configurations; used with VC1/VC2/VC4 to reconstruct individual cell voltages. |
| 4 (GND) | Analog and power ground reference | Common return for all internal comparators and current sources; must be low-impedance connection to battery negative. |
| 5 (VC4) | Least positive (bottom) cell voltage sense | Connects to node between lowest cell and GND; completes 4-cell differential sensing path (VC4–GND). |
| 6 (CD) | Capacitor delay timing input | External capacitor sets overvoltage response delay; internal 0.18 µA current source charges it to 1.2 V threshold. |
| 7 (VDD) | Power supply input | Accepts 4–25 V; powers internal circuitry; may be tied to VC1 in standard configurations. |
| 8 (OUT) | Open-drain protection output | Drives external N-channel FET gate; transitions high (pulled up externally) to activate fuse-blowing circuit. |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 4.60 V overvoltage threshold | Eliminates need for external resistor dividers or trimming; guarantees consistent trip point across production lots. |
| Programmable delay via CD pin | Enables system-level optimization of response time (1–2 s typical) to distinguish transient spikes from true overvoltage faults. |
| 320 mV hysteresis | Prevents chatter during recovery by enforcing 4.28 V release threshold, ensuring clean, single-event latching behavior. |
| 2 µA typical supply current | Extends battery shelf life and reduces self-discharge in protected packs during storage or standby. |
| Stable under pulse charge | Maintains accurate monitoring during high-current charging cycles where cell voltage exhibits dynamic overshoot. |
| High ripple rejection | Rejects supply noise without external RC filters, simplifying PCB layout and reducing BOM count in space-constrained battery modules. |
Applications
| Notebook Computer Battery Packs | Portable Instrumentation Power Systems |
|---|---|
Use Scenario: Secondary overvoltage protection in 3- or 4-cell Li-ion packs for ultrabooks and 2-in-1 devices. IC Role / Device Role / Timing Role: Monitors each cell independently and triggers fuse blow within 2 seconds if any cell exceeds 4.60 V. Use Value: Adds fail-safe layer beyond primary protection ICs, preventing thermal runaway during charger malfunction or firmware failure. |
Use Scenario: Safety-critical backup power in handheld multimeters, gas detectors, and portable oscilloscopes. IC Role / Device Role / Timing Role: Acts as autonomous hardware-enforced cutoff that operates independently of MCU supervision. Use Value: Guarantees protection even during brownout, reset, or software lockup-meeting IEC 62133 safety requirements. |
| Medical Portable Diagnostic Devices | Industrial Handheld Data Collectors |
Use Scenario: Dual-layer protection in battery packs for ultrasound probes and ECG monitors. IC Role / Device Role / Timing Role: Provides redundant overvoltage detection with 320 mV hysteresis to prevent false resets during clinical use. Use Value: Meets UL 2054 and IEC 60601-1 battery safety clauses for medical equipment with no reliance on host processor. |
Use Scenario: Ruggedized barcode scanners and RFID readers deployed in warehouses and field service. IC Role / Device Role / Timing Role: Detects overvoltage during fast-charging cycles and asserts OUT to disable charging path before cell degradation. Use Value: Extends cycle life by preventing >4.60 V exposure, reducing warranty claims from premature capacity loss. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar secondary overvoltage protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BQ29419PW | Lower 4.30 V overvoltage threshold; same pinout, timing, and accuracy specs. | Suitable for lower-voltage Li-ion chemistries or conservative safety margins. | Select when system requires earlier intervention than 4.60 V, e.g., for LTO or high-reliability legacy cells. |
| BQ29414PW | 4.55 V threshold; otherwise identical electrical and mechanical specifications. | Used where 4.55 V provides optimal balance between cell utilization and safety margin. | Choose for newer 4.35–4.45 V nominal Li-ion cells needing tighter control than BQ29415's 4.60 V. |
Compared with BQ29415PW, BQ29419PW offers earlier trip (4.30 V) for enhanced safety at reduced voltage headroom, while BQ29414PW (4.55 V) provides intermediate protection-enabling fine-grained selection based on cell chemistry and system-level fault tolerance requirements.
Availability
BQ29415PW is available at Aetrix Electronics and suitable for notebook computer battery packs, portable instrumentation power systems, and medical diagnostic device batteries requiring stable component supply and long-term lifecycle support.
Supply support for BQ29415PW 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 experience in battery safety ICs.
The bq2941x family was designed specifically for secondary overvoltage protection in multi-cell Li-ion battery packs, delivering hardware-enforced redundancy independent of primary fuel gauges or microcontrollers.
FAQ
What is the exact overvoltage protection threshold of the BQ29415PW?
The BQ29415PW has a fixed, factory-trimmed overvoltage detection threshold of 4.60 V per cell, with ±80 mV accuracy over the full –40°C to 110°C operating range. This value is specific to the BQ29415PW variant and is not adjustable via external components or programming. The BQ29415PW implements this threshold using an internal precision reference and comparator architecture optimized for stability under battery pack thermal and voltage transients.
How does the BQ29415PW generate its programmable delay time?
The BQ29415PW uses an internal 0.18 µA current source to charge an external capacitor connected to the CD pin; delay time equals (1.2 V × CDELAY) / 0.18 µA. For example, a 0.22 µF capacitor yields a nominal 1.5 s delay. The BQ29415PW clamps CD to GND if overvoltage clears before 1.2 V is reached, preserving full delay for subsequent events. This mechanism is integral to the BQ29415PW's fault discrimination capability.
Is the BQ29415PW pin-compatible with other bq2941x variants?
Yes-the BQ29415PW shares identical TSSOP-8 (PW) pinout and package dimensions with all bq2941x family members, including BQ29410PW through BQ29419PW. All variants use the same VC1–VC4, GND, CD, VDD, and OUT pin assignments and electrical interface. This allows direct substitution in existing layouts when changing overvoltage thresholds, provided system-level timing and hysteresis requirements remain compatible with the BQ29415PW's 4.60 V / 320 mV specification.
What is the recommended operating voltage range for the VDD pin of the BQ29415PW?
The BQ29415PW supports a VDD supply range of 4 V to 25 V, per TI's recommended operating conditions. In typical 4-cell Li-ion applications, VDD is connected to VC1 (stack top), which can reach up to ~18.4 V fully charged. The BQ29415PW maintains full functionality-including accurate cell monitoring and OUT assertion-across this range, with supply current remaining below 3.5 µA even at 25 V.
Does the BQ29415PW require external passive components for basic operation?
Yes-the BQ29415PW requires an external capacitor on the CD pin to set overvoltage delay time and a pull-up resistor on the OUT pin to drive the external N-channel FET gate. No external resistors are needed for voltage sensing, as the BQ29415PW performs direct cell terminal monitoring. Optional RC filters (RIN/CIN) may be added to VC pins for noise immunity, but the BQ29415PW's internal design provides sufficient ripple rejection for most battery pack environments without them.
BQ29415PW 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
BQ29415PW FAQ
1.How can I place an order for BQ29415PW through Aetrix?
Please submit a Request for Quotation (RFQ) for BQ29415PW 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 BQ29415PW reliable?
The price and inventory of BQ29415PW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BQ29415PW is usually 5 days.
3.What payment methods are accepted for BQ29415PW?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BQ29415PW transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BQ29415PW?
BQ29415PW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BQ29415PW 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 BQ29415PW?
For technical support, including BQ29415PW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BQ29415PW requirements.
6.How does Aetrix verify that BQ29415PW is sourced from the original manufacturer or authorized distributors?
All BQ29415PW 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 BQ29415PW meets industry standards.
7.What is the process for return or replacement of BQ29415PW?
All BQ29415PW units undergo pre-shipment inspection (PSI). If there is an issue with BQ29415PW, 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 BQ29415PW part is unused and in its original packaging.
Return procedure for BQ29415PW:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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