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Texas Instruments BQ29413PW
- Part No.:
- BQ29413PW
- Manufacturer:
- Texas Instruments
- Category:
- Battery Management
- Package:
- 8-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
BQ29413PW.pdf
- Description:
- IC BATT PROT LI-ION 2-4CL 8TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,175
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Product details
Overview
BQ29413PW from Texas Instruments is a secondary overvoltage protection IC for 2-, 3-, or 4-cell Li-ion battery packs, featuring fixed 4.50 V per-cell overvoltage threshold, programmable delay via external capacitor on CD pin, and ultra-low 2 µA supply current. It operates across –40°C to 110°C and drives an external N-channel FET to blow a fuse during overvoltage events in notebook battery packs.
For engineers reviewing the BQ29413PW datasheet, BQ29413PW pinout, BQ29413PW application, or BQ29413PW equivalent, this page delivers verified technical context, exact pin functions, real-world use scenarios in portable instrumentation and equipment, and validated alternative parts with documented functional differences.
Technical Context
The BQ29413PW implements precision cell-voltage monitoring using internal reference comparison across VC1–VC4 inputs, triggering a controlled delay sequence when any cell exceeds 4.50 V. Its output logic activates only after CD pin voltage reaches 1.2 V, ensuring immunity to transient spikes.
It supports flexible cell configurations (2S–4S) with defined connection sequences, includes high power supply ripple rejection, and maintains stable operation during pulse-charge conditions. The OUT pin provides rail-to-rail drive capability up to 1 mA sink current at 0.1 V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Overvoltage Threshold | 4.50 V per cell - fixed, factory-trimmed accuracy enables precise second-level protection without calibration. |
| Supply Current | < 2 µA - enables long-term battery monitoring without significant self-discharge impact. |
| Operating Temperature | –40°C to 110°C - supports industrial and high-ambient portable equipment environments. |
| Delay Time Programmability | Configured via external CD capacitor (e.g., 0.22 µF yields 1–2 s delay) - allows system-level timing control for fault response. |
| Input Voltage Range | VCn pins: 0–25 V; differential cell voltage: 0–5 V - accommodates full Li-ion cell stack range with margin. |
| Output Drive Capability | OUT sinks ≥5 µA at 0.1 V, sources ≥–1 mA at 3 V - directly interfaces standard NCH FET gate drivers. |
| Overvoltage Accuracy | ±25 mV at 25°C, ±50 mV at –20°C to 85°C - ensures reliable trip point across temperature without derating. |
Pinout & Package
TSSOP-8 (PW) package: 3.0 mm × 4.4 mm, 1.2 mm max height, 0.65 mm pitch, 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; monitors highest potential cell voltage. |
| 2 (VC2) | Sense input for second most positive cell | Monitors voltage between first and second cells in series string. |
| 3 (VC3) | Sense input for third most positive cell | Required for 3S/4S configurations; enables individual cell overvoltage detection. |
| 4 (GND) | Ground reference | System ground return for all analog and digital circuitry; must be low-impedance. |
| 5 (VC4) | Sense input for least positive cell | Connects to bottom of stack (cell 4 in 4S, cell 3 in 3S, or cell 2 in 2S). |
| 6 (CD) | Capacitor delay timer input | Charged by internal 0.18 µA current source; 1.2 V threshold sets overvoltage response time. |
| 7 (VDD) | Power supply input | Accepts 4–25 V; powers internal circuitry and bias networks; decoupling required. |
| 8 (OUT) | Protection output driver | Open-drain compatible; pulls high to activate external NCH FET for fuse blowing. |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 4.50 V overvoltage threshold | Eliminates need for external resistor dividers or trimming; reduces BOM count and layout complexity. |
| Programmable overvoltage delay | Enables system-level coordination with primary protection ICs; avoids nuisance trips during charge transients. |
| Ultra-low 2 µA quiescent current | Extends shelf life and standby runtime in battery-powered devices without compromising safety coverage. |
| High ripple rejection | Rejects switching noise from DC-DC chargers and pulse charging waveforms, preventing false triggers. |
| Stable under pulse charge | Maintains accurate voltage sampling during high-dV/dt charge phases, critical for fast-charging applications. |
Applications
| Portable Instrumentation | Notebook Computers |
|---|---|
Use Scenario: Handheld multimeters and data loggers with removable Li-ion battery packs. IC Role / Device Role / Timing Role: Second-level overvoltage protector that activates only after sustained overvoltage, independent of host MCU. Use Value: Prevents thermal runaway during charger malfunction or firmware failure, meeting IEC 62133 safety requirements. |
Use Scenario: Main battery pack in consumer and commercial notebooks with dual-protection architecture. IC Role / Device Role / Timing Role: Hardware-enforced backup cutoff triggered when primary protection fails or is bypassed. Use Value: Guarantees fail-safe shutdown even if system-level software or primary IC is compromised. |
| Portable Medical Devices | Industrial Handheld Terminals |
Use Scenario: Battery-powered ECG monitors and infusion pumps requiring certified safety margins. IC Role / Device Role / Timing Role: Independent analog voltage monitor with no dependency on microcontroller clock or firmware state. Use Value: Meets ISO 13485 and UL 62368-1 requirements for redundant overvoltage protection in Class II medical equipment. |
Use Scenario: Ruggedized warehouse scanners and field service terminals operating in wide-temperature environments. IC Role / Device Role / Timing Role: Cell-level voltage supervisor enabling safe hot-swap and deep-discharge recovery. Use Value: Supports –40°C to 110°C operation and withstands repeated mechanical shock without parameter drift. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar secondary overvoltage protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BQ29412PW | 4.45 V overvoltage threshold; otherwise identical pinout, timing, and package. | Suitable for lower-voltage Li-ion chemistries or tighter safety margins where 4.50 V is excessive. | Select when cell chemistry requires earlier intervention than BQ29413PW's 4.50 V threshold. |
| BQ29414PW | 4.55 V overvoltage threshold; same CD delay architecture and OUT drive strength. | Used in high-voltage Li-ion variants (e.g., LiCoO₂ with extended upper limit) needing higher trip point. | Choose when battery specification permits higher end-of-charge voltage and system tolerances allow 4.55 V. |
Compared with BQ29412PW and BQ29414PW, the BQ29413PW provides the industry-standard 4.50 V second-level trip point for mainstream Li-ion cells, balancing safety margin and usable capacity without requiring PCB changes or firmware updates.
Availability
BQ29413PW is available at Aetrix Electronics and suitable for notebook computers, portable instrumentation, and industrial handheld terminals requiring stable component supply with guaranteed long-term availability and traceable sourcing.
Supply support for BQ29413PW 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, precision, and power efficiency.
The bq2941x family was designed specifically for secondary overvoltage protection in multi-cell Li-ion battery packs, targeting applications where hardware-enforced redundancy is mandated by safety standards.
FAQ
What is the exact overvoltage protection threshold of the BQ29413PW?
The BQ29413PW has a fixed, factory-trimmed overvoltage threshold of 4.50 V per cell, specified with ±25 mV accuracy at 25°C and ±50 mV over –20°C to 85°C. This value is not adjustable and applies uniformly across all supported 2S–4S configurations. The BQ29413PW uses this threshold to initiate the CD pin delay sequence upon detection of any single-cell overvoltage condition.
How does the BQ29413PW implement programmable delay time?
The BQ29413PW 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. A 0.22 µF capacitor yields 1–2 seconds typical delay. The BQ29413PW resets the timer if all cell voltages fall below 4.50 V before CD reaches 1.2 V, ensuring responsive recovery after transient overvoltages.
Can the BQ29413PW be used in a 2-cell Li-ion configuration?
Yes, the BQ29413PW supports 2-cell (2S), 3-cell (3S), and 4-cell (4S) configurations. For 2S operation, VC1 and VC2 are tied together at the top of the stack, VC3 is connected to the midpoint, and VC4 to the bottom (GND). The BQ29413PW monitors differential voltages VC1–VC2, VC2–VC3, VC3–VC4, and VC4–GND to detect overvoltage on either cell independently.
What is the recommended external capacitor value for the CD pin on the BQ29413PW?
The recommended CD capacitor value for the BQ29413PW is 0.22 µF, yielding a nominal delay time of 1–2 seconds. Values between 0.22 µF and 1 µF are supported per datasheet specifications. Larger capacitors increase delay linearly but require careful PCB layout to avoid leakage paths; the BQ29413PW's CD pin input current is specified at 5–12 µA when clamped at 1 V, confirming robustness against board-level parasitics.
Does the BQ29413PW require external passive components beyond the CD capacitor?
Yes, the BQ29413PW requires external RC filters: a 100 Ω–1 kΩ resistor (RIN) and 0.01–0.1 µF capacitor (CIN) on each VC pin for noise filtering, plus a 0–1 kΩ resistor (RVD) and 0.1 µF capacitor (CVD) on VDD. These components suppress high-frequency noise and ensure stable voltage monitoring. The BQ29413PW's internal architecture relies on these external filters to maintain ±25 mV overvoltage accuracy under real-world EMI conditions.
BQ29413PW Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tube
- Product Status:
- Discontinued at Digi-Key
- 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
BQ29413PW FAQ
1.How can I place an order for BQ29413PW through Aetrix?
Please submit a Request for Quotation (RFQ) for BQ29413PW 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 BQ29413PW reliable?
The price and inventory of BQ29413PW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BQ29413PW is usually 5 days.
3.What payment methods are accepted for BQ29413PW?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BQ29413PW transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BQ29413PW?
BQ29413PW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BQ29413PW 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 BQ29413PW?
For technical support, including BQ29413PW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BQ29413PW requirements.
6.How does Aetrix verify that BQ29413PW is sourced from the original manufacturer or authorized distributors?
All BQ29413PW 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 BQ29413PW meets industry standards.
7.What is the process for return or replacement of BQ29413PW?
All BQ29413PW units undergo pre-shipment inspection (PSI). If there is an issue with BQ29413PW, 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 BQ29413PW part is unused and in its original packaging.
Return procedure for BQ29413PW:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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