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Texas Instruments BQ29412PWRG4
- Part No.:
- BQ29412PWRG4
- Manufacturer:
- Texas Instruments
- Category:
- Battery Management
- Package:
- 8-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
BQ29412PWRG4.pdf
- Description:
- IC BATT PROT LI-ION 2-4CL 8TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,857
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Product details
Overview
BQ29412PWRG4 from Texas Instruments is a secondary overvoltage protection IC for 2-, 3-, or 4-cell Li-ion battery packs, featuring fixed 4.45 V overvoltage threshold, <2 µA supply current, programmable delay via external capacitor on CD pin, and OUT pin drive capable of activating external N-channel FETs for fuse blowing in high-side battery rail protection circuits.
For engineers reviewing the BQ29412PWRG4 datasheet, BQ29412PWRG4 pinout, BQ29412PWRG4 application, or BQ29412PWRG4 equivalent, this device is selected for second-level cell voltage monitoring where precision, ultra-low quiescent current, and stable operation during pulse charging are critical in portable instrumentation and notebook battery management systems.
Technical Context
The BQ29412PWRG4 implements independent per-cell voltage comparison against an internal reference, triggering protection only when any single cell exceeds 4.45 V. Its delay timing is determined by external RC network on CD pin (ICD = 0.18 µA), with 1.2 V threshold at CD pin initiating OUT high transition.
It supports differential sensing across up to four cells (VC1–VC2, VC2–VC3, VC3–VC4, VC4–GND), operates from 4 V to 25 V supply, maintains accuracy over –40°C to 110°C, and includes high ripple rejection to prevent false triggers during fast-charging transients.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Overvoltage Threshold | 4.45 V ±50 mV (max) - precisely sets trip point for 4-cell Li-ion packs requiring tight safety margin above nominal 4.2 V/cell. |
| Supply Current (ICC) | <2 µA at 25°C - enables multi-year battery pack shelf life without significant self-discharge impact. |
| Delay Time Programmability | Configurable via CD pin capacitor (e.g., 0.22 µF → 1.5 s typical) - allows system-level tuning of fault response window before fuse activation. |
| Cell Voltage Input Range | 0–5 V differential per cell pair - supports full operating range of Li-ion cells including pre-charge and overvoltage conditions. |
| Operating Temperature | –40°C to 110°C - qualified for use in thermally demanding portable equipment and industrial battery packs. |
| Output Drive Capability | OUT drives high to ≥1.5 V at 40 µA load - sufficient to bias gate of discrete NCH FET used in high-side disconnect path. |
| Hysteresis | 320 mV - ensures clean recovery after overvoltage event without oscillation near threshold. |
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, 1 year).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (VC1) | Sense input for most positive cell | Connects to top of battery stack; referenced internally for overvoltage detection of highest-potential cell. |
| 2 (VC2) | Sense input for second most positive cell | Enables differential measurement between adjacent cells in series string; critical for accurate per-cell monitoring. |
| 3 (VC3) | Sense input for third most positive cell | Supports 3- and 4-cell configurations; must be tied appropriately (e.g., to VC2 in 3-cell mode) per connection sequence rules. |
| 4 (GND) | Analog/digital ground reference | Common return for all sense inputs and internal circuitry; requires low-impedance PCB connection to battery negative. |
| 5 (VC4) | Sense input for least positive cell | Connects to node between lowest cell and GND; completes 4-cell differential chain (VC4–GND = lowest cell voltage). |
| 6 (CD) | Capacitor delay timing input | Internal 0.18 µA current source charges external capacitor; 1.2 V threshold determines delay duration before OUT assertion. |
| 7 (VDD) | Power supply input | Accepts 4–25 V; powers internal comparators and logic; decoupling capacitor required per layout guidelines. |
| 8 (OUT) | Protection output signal | Open-drain compatible; transitions high to activate external NCH FET for high-side fuse blow; pulls low after recovery. |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 4.45 V overvoltage threshold | Eliminates need for external resistor divider calibration; reduces BOM count and improves long-term stability vs. adjustable solutions. |
| Ultra-low ICC <2 µA | Minimizes parasitic drain on battery during storage or standby, extending shelf life and reducing risk of deep discharge. |
| Programmable delay via CD pin | Allows system designers to set precise time window (e.g., 1–2 s) before protection action, avoiding nuisance trips from transient spikes. |
| High power supply ripple rejection | Prevents false triggering during fast-charging AC ripple or switching noise on VDD line without additional filtering. |
| Stable during pulse charge operation | Maintains accurate voltage monitoring even under high dv/dt conditions common in smart charger algorithms. |
Applications
| Portable Instrumentation | Notebook Computers |
|---|---|
Use Scenario: Handheld multimeters and portable oscilloscopes with removable Li-ion battery packs. IC Role / Device Role / Timing Role: Second-level overvoltage protector that independently monitors each cell during charging and runtime. Use Value: Prevents thermal runaway by cutting off charge path if any cell exceeds 4.45 V, meeting IEC 62133 safety requirements. |
Use Scenario: Main battery pack in consumer ultrabooks with dual-cell or quad-cell configuration. IC Role / Device Role / Timing Role: Redundant voltage supervisor backing up primary fuel gauge IC, asserting OUT only on confirmed overvoltage. Use Value: Adds fail-safe layer that remains active even if host MCU or primary BMS fails, ensuring compliance with UL 2054. |
| Medical Portable Devices | Industrial Handheld Scanners |
Use Scenario: Battery-powered ECG monitors and infusion pumps requiring certified safety margins. IC Role / Device Role / Timing Role: Independent hardware-based overvoltage detector with fixed 4.45 V threshold and 1.2 V CD comparator. Use Value: Enables functional safety certification (IEC 61508 SIL-2) by providing deterministic, analog-only protection path. |
Use Scenario: Rugged barcode scanners used in warehouse logistics with frequent hot-swap battery operation. IC Role / Device Role / Timing Role: Secondary protector that survives repeated connect/disconnect cycles and maintains accuracy across temperature extremes. Use Value: Guarantees reliable overvoltage cutoff despite mechanical stress-induced solder joint fatigue or connector arcing events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar secondary overvoltage protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BQ29411PWRG4 | 4.40 V overvoltage threshold; otherwise identical pinout, timing, and electrical specs. | Suitable for tighter-margin 3-cell packs or legacy designs calibrated for 4.40 V trip. | Select when system-level validation confirms 4.40 V provides optimal balance between safety margin and usable capacity. |
| BQ29413PWR | 4.50 V threshold; same PW package; MSL Level-1 (vs. Level-2 for BQ29412PWRG4); no G4 suffix. | Used in higher-voltage 4-cell packs where extended upper voltage window is acceptable. | Choose for new designs targeting maximum energy density, provided cell chemistry supports 4.50 V sustained operation. |
Compared with BQ29411PWRG4 and BQ29413PWR, the BQ29412PWRG4 offers the industry-standard 4.45 V threshold for 4-cell Li-ion, balancing safety margin and cycle life while maintaining compatibility with TI's established layout and qualification data for the PW package.
Availability
BQ29412PWRG4 is available at Aetrix Electronics and suitable for notebook computers, portable instrumentation, medical handheld devices, and industrial scanners requiring stable component supply with guaranteed long-term manufacturability and traceable sourcing.
Supply support for BQ29412PWRG4 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 specializing in analog and embedded processing technologies, with leadership in power management, signal chain, and battery management solutions.
The bq2941x product line was designed specifically for secondary overvoltage protection in multi-cell Li-ion battery packs, delivering precision, ultra-low power, and robust operation in space-constrained portable applications.
FAQ
What is the exact overvoltage protection threshold of the BQ29412PWRG4?
The BQ29412PWRG4 has a fixed overvoltage protection threshold of 4.45 V per cell, with a maximum accuracy deviation of ±50 mV over –40°C to 85°C and ±80 mV over the full –40°C to 110°C operating range. This value is factory-trimmed and does not require external calibration.
How is the delay time configured on the BQ29412PWRG4?
The delay time on the BQ29412PWRG4 is set by an external capacitor connected to the CD pin. An internal 0.18 µA current source charges the capacitor; when voltage at CD reaches 1.2 V, the OUT pin asserts. For example, a 0.22 µF capacitor yields ~1.5 s typical delay (tD = 1.2 V × CDELAY / 0.18 µA).
Can the BQ29412PWRG4 be used in a 2-cell battery configuration?
Yes, the BQ29412PWRG4 supports 2-, 3-, and 4-cell configurations. In 2-cell mode, VC1 and VC2 are tied together and connected to the top of the stack, VC3 is tied to VC2, and VC4 connects to the bottom of the second cell. The datasheet specifies exact connection sequences to prevent false triggering.
What is the function of the OUT pin on the BQ29412PWRG4?
The OUT pin on the BQ29412PWRG4 is an open-drain output that transitions high when overvoltage is detected and the CD delay expires. It is designed to drive the gate of an external N-channel MOSFET in the high-side battery rail, enabling controlled fuse blowing or disconnect switch activation for permanent protection.
Does the BQ29412PWRG4 require external passive components for basic operation?
Yes - the BQ29412PWRG4 requires at minimum: (1) a capacitor on the CD pin for delay timing, (2) a 0.1 µF ceramic capacitor between VDD and GND for supply decoupling, and (3) optional RC filters (RIN/CIN) on VC pins for noise immunity. No external resistors are needed for threshold setting.
BQ29412PWRG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- 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
BQ29412PWRG4 FAQ
1.How can I place an order for BQ29412PWRG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for BQ29412PWRG4 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 BQ29412PWRG4 reliable?
The price and inventory of BQ29412PWRG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BQ29412PWRG4 is usually 5 days.
3.What payment methods are accepted for BQ29412PWRG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BQ29412PWRG4 transactions.
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4.How is shipping managed for BQ29412PWRG4?
BQ29412PWRG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BQ29412PWRG4 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 BQ29412PWRG4?
For technical support, including BQ29412PWRG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BQ29412PWRG4 requirements.
6.How does Aetrix verify that BQ29412PWRG4 is sourced from the original manufacturer or authorized distributors?
All BQ29412PWRG4 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 BQ29412PWRG4 meets industry standards.
7.What is the process for return or replacement of BQ29412PWRG4?
All BQ29412PWRG4 units undergo pre-shipment inspection (PSI). If there is an issue with BQ29412PWRG4, 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 BQ29412PWRG4 part is unused and in its original packaging.
Return procedure for BQ29412PWRG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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