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Texas Instruments BQ29419PWR
- Part No.:
- BQ29419PWR
- Manufacturer:
- Texas Instruments
- Category:
- Battery Management
- Package:
- 8-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
BQ29419PWR.pdf
- Description:
- IC BATT PROT LI-ION 2-4CL 8TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,799
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Product details
Overview
BQ29419PWR from Texas Instruments is a secondary overvoltage protection IC for 2-, 3-, or 4-cell Li-ion battery packs, featuring fixed 4.30 V per-cell overvoltage threshold, <2 µA supply current, and programmable delay via external capacitor on CD pin; used in notebook computers and portable instrumentation to prevent cell damage during charging.
For engineers reviewing the BQ29419PWR datasheet, BQ29419PWR pinout, BQ29419PWR application, or BQ29419PWR equivalent, this page delivers verified technical context, package mapping, functional pin roles, real-world use cases, and validated alternative options for second-level battery protection design.
Technical Context
The BQ29419PWR monitors individual cell voltages (VC1–VC4) against a precision internal reference and triggers protection when any cell exceeds 4.30 V with ±80 mV accuracy over –40°C to 110°C. It implements a charge-based delay using an internal 0.18 µA current source into an external capacitor on the CD pin.
Upon reaching 1.2 V at CD, the OUT pin transitions high to drive an external N-channel FET, enabling fuse blow in the positive battery rail. The device maintains stable operation during pulse charging and rejects high-frequency supply ripple without false triggering.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Overvoltage Threshold | 4.30 V per cell - precise second-level cutoff preventing Li-ion cell overcharge beyond safe voltage limit |
| Supply Current (ICC) | <2 µA - ultra-low quiescent power enables long-term battery monitoring without significant drain |
| Overvoltage Accuracy | ±80 mV over –40°C to 110°C - ensures reliable trip point across industrial temperature range |
| Delay Time Programmability | Configurable via CD pin capacitor (e.g., 0.22 µF → ~1.5 s delay) - allows tuning of response time to avoid nuisance trips |
| Cell Input Range | 0–25 V per VCx pin - supports full operating range of multi-cell Li-ion stacks up to 4 cells |
| Operating Temperature | –40°C to 110°C - qualified for harsh environments in portable and industrial battery systems |
| Hysteresis | 250 mV - prevents oscillation near trip point by requiring voltage to fall to 4.05 V before reset |
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 input for 2–4 cell monitoring |
| 2 (VC2) | Second most positive cell voltage sense | Monitors voltage between first and second cell in series string |
| 3 (VC3) | Third most positive cell voltage sense | Required only for 4-cell configurations; senses intermediate node |
| 4 (GND) | Analog ground reference | Common return for all voltage inputs and internal circuitry; must be low-impedance |
| 5 (VC4) | Least positive cell voltage sense | Connects to bottom cell's positive terminal (or battery negative in 2-cell config) |
| 6 (CD) | Capacitor delay timing input | Internal 0.18 µA current charges external capacitor; 1.2 V threshold sets delay duration |
| 7 (VDD) | Power supply input | Accepts 4–25 V; powers internal circuitry and bias networks independently of cell stack |
| 8 (OUT) | Open-drain protection output | Drives external N-FET gate; sinks ≥5 µA at 0.1 V, sources ≤–1 mA at 3 V load |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 4.30 V overvoltage threshold | Guaranteed trip point eliminates calibration effort and ensures compliance with Li-ion safety standards |
| Programmable detection delay | External RC network on CD pin enables adjustable response window (e.g., 1–2 s) to tolerate transient spikes |
| High ripple rejection | Immunity to switching noise on VDD or cell lines prevents false triggering during DC-DC charger operation |
| Stable under pulse charge | Maintains accurate monitoring during intermittent high-current charging pulses without latch-up or drift |
| Low ICC & IIN | <2 µA supply current and <0.3 µA input bias enable direct connection to high-impedance cell taps |
Applications
| Notebook Computers | Portable Instrumentation |
|---|---|
Use Scenario: Multi-cell Li-ion battery pack in ultrabook platform undergoing fast AC charging with variable load transients. IC Role / Device Role / Timing Role: Second-level hardware overvoltage protector that acts independently of fuel gauge or charger IC. Use Value: Prevents thermal runaway by cutting off charge path within 1.5 s if any cell exceeds 4.30 V, even if primary protection fails. |
Use Scenario: Handheld multimeter with integrated rechargeable 3-cell Li-ion battery subjected to field vibration and temperature cycling. IC Role / Device Role / Timing Role: Standalone cell-voltage monitor providing fail-safe shutdown signal to system power controller. Use Value: Ensures measurement integrity and user safety by disabling charging when cell imbalance or overvoltage occurs at –20°C to 70°C ambient. |
| Medical Portable Devices | Industrial Handheld Scanners |
Use Scenario: Battery-powered ECG monitor operating continuously for 8+ hours with periodic high-current sensor activation. IC Role / Device Role / Timing Role: Redundant overvoltage guard that activates only upon sustained cell overvoltage, not momentary spikes. Use Value: Meets IEC 62368-1 requirements for secondary protection with <2 µA self-consumption preserving runtime. |
Use Scenario: Rugged barcode scanner deployed in warehouse environments with frequent drop impact and wide temperature swings. IC Role / Device Role / Timing Role: Hardware-enforced voltage clamp in battery management subsystem, independent of firmware control. Use Value: Eliminates risk of fire or swelling due to charger malfunction by blowing fuse before cell reaches 4.35 V. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar secondary overvoltage protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BQ29412PWR | 4.45 V overvoltage threshold, 320 mV hysteresis | Suitable for higher-voltage Li-ion chemistries (e.g., LiCoO₂ with extended upper limit) | Select when system requires tighter margin above nominal 4.2 V but still needs second-level redundancy |
| BQ29415PWR | 4.60 V threshold, same 8-pin TSSOP package and pinout | Targeted at specialized high-voltage Li-ion variants or custom battery designs with elevated charge termination | Choose only if battery specification explicitly mandates 4.60 V trip; otherwise risks insufficient safety margin |
Compared with BQ29419PWR, BQ29412PWR provides higher trip voltage for broader chemistry compatibility, while BQ29415PWR targets niche high-VOC cells-both retain identical delay programming, low ICC, and thermal robustness but shift protection thresholds outside standard Li-ion safety envelope.
Availability
BQ29419PWR is available at Aetrix Electronics and suitable for notebook computers, portable instrumentation, and medical portable devices requiring stable component supply with guaranteed long-term sourcing and full traceability.
Supply support for BQ29419PWR 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 is designed specifically for redundant overvoltage protection in multi-cell Li-ion battery packs, targeting applications where failure of primary protection must not compromise safety.
FAQ
What is the exact overvoltage protection threshold of the BQ29419PWR?
The BQ29419PWR has a fixed overvoltage protection threshold of 4.30 V per cell, specified with ±80 mV accuracy over the full operating temperature range of –40°C to 110°C. This value is factory-trimmed and does not require external configuration. The BQ29419PWR is part of the bq2941x family, where each variant has a unique fixed threshold-BQ29419PWR is the 4.30 V option.
How is the delay time set on the BQ29419PWR?
The BQ29419PWR 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 ~1.5 s delay. The BQ29419PWR does not support digital delay adjustment-only passive RC tuning is supported per datasheet SLUS669G.
Can the BQ29419PWR monitor fewer than four cells?
Yes-the BQ29419PWR supports 2-, 3-, or 4-cell configurations via specific interconnection schemes: for 2-cell, tie VC1=VC2=VC3=VDD and connect VC4 to bottom cell; for 3-cell, tie VC1=VC2=VDD and route VC3/VC4 accordingly. All configurations use the same BQ29419PWR device without modification.
What package type and dimensions does the BQ29419PWR use?
The BQ29419PWR is supplied in an 8-pin TSSOP (PW) package measuring 3.0 mm × 4.4 mm with 0.65 mm lead pitch and maximum height of 1.2 mm. It features NiPdAu lead finish, RoHS compliance, and JEDEC MO-153 AA registration. The BQ29419PWR is not offered in MSOP (DCT) packaging-only PW variants are active per TI's packaging addendum.
Does the BQ29419PWR require external components for basic operation?
Yes-the BQ29419PWR requires at minimum an external capacitor on the CD pin to set overvoltage delay time, plus decoupling capacitance on VDD. Optional RC filters on VCx inputs improve noise immunity. No external resistors or references are needed, as the 4.30 V threshold and current source are fully integrated. The BQ29419PWR operates without firmware or host communication.
BQ29419PWR 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
BQ29419PWR FAQ
1.How can I place an order for BQ29419PWR through Aetrix?
Please submit a Request for Quotation (RFQ) for BQ29419PWR 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 BQ29419PWR reliable?
The price and inventory of BQ29419PWR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BQ29419PWR is usually 5 days.
3.What payment methods are accepted for BQ29419PWR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BQ29419PWR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BQ29419PWR?
BQ29419PWR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BQ29419PWR 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 BQ29419PWR?
For technical support, including BQ29419PWR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BQ29419PWR requirements.
6.How does Aetrix verify that BQ29419PWR is sourced from the original manufacturer or authorized distributors?
All BQ29419PWR 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 BQ29419PWR meets industry standards.
7.What is the process for return or replacement of BQ29419PWR?
All BQ29419PWR units undergo pre-shipment inspection (PSI). If there is an issue with BQ29419PWR, 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 BQ29419PWR part is unused and in its original packaging.
Return procedure for BQ29419PWR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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