Texas Instruments
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BQ76925PWR
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BQ76925PWR

Product Overview

Category

BQ76925PWR belongs to the category of integrated circuits (ICs) used in battery management systems.

Use

This IC is specifically designed for monitoring and protecting lithium-ion and lithium-polymer battery packs.

Characteristics

  • High accuracy voltage and temperature monitoring
  • Overvoltage, undervoltage, and overtemperature protection
  • Balancing control for individual cells
  • Communication interface for system integration

Package

BQ76925PWR is available in a small outline package (SOP) with 20 pins.

Essence

The essence of BQ76925PWR lies in its ability to ensure safe and efficient operation of lithium-ion and lithium-polymer battery packs by providing comprehensive monitoring and protection features.

Packaging/Quantity

This IC is typically sold in reels containing 2500 units per reel.

Specifications

  • Operating Voltage Range: 2.7V to 28V
  • Cell Voltage Measurement Range: 0V to 5V
  • Temperature Measurement Range: -40°C to +125°C
  • Balancing Current: Up to 150mA per cell
  • Communication Interface: I2C

Detailed Pin Configuration

  1. VSS: Ground
  2. VDD: Power Supply
  3. SDA: I2C Data Line
  4. SCL: I2C Clock Line
  5. ALERT: Interrupt Output
  6. BAT: Battery Pack Connection
  7. VC1 to VC6: Cell Voltage Inputs
  8. TS1 to TS3: Temperature Sensor Inputs
  9. CB1 to CB6: Cell Balancing Control Outputs
  10. CBGND: Balancing Ground
  11. VREF: Reference Voltage Output
  12. VREG: Regulator Output
  13. VIO: Digital Input/Output Voltage
  14. VSS: Ground
  15. VDD: Power Supply
  16. VSS: Ground
  17. VDD: Power Supply
  18. VSS: Ground
  19. VDD: Power Supply
  20. VSS: Ground

Functional Features

  • Accurate monitoring of individual cell voltages and temperatures
  • Protection against overvoltage, undervoltage, and overtemperature conditions
  • Cell balancing to equalize charge levels among cells
  • I2C interface for easy integration with battery management systems
  • Interrupt output for timely system notifications

Advantages and Disadvantages

Advantages

  • High accuracy voltage and temperature monitoring ensure safe battery operation.
  • Comprehensive protection features safeguard the battery pack from potential damage.
  • Cell balancing capability extends the overall battery life.
  • Integration-friendly I2C interface simplifies system design.

Disadvantages

  • Limited to lithium-ion and lithium-polymer battery packs.
  • Requires external components for complete battery management system implementation.

Working Principles

BQ76925PWR operates by continuously measuring the voltage and temperature of each cell in a battery pack. It compares these values against predefined thresholds to detect abnormal conditions such as overvoltage, undervoltage, or overtemperature. In case of an abnormality, the IC triggers appropriate protection mechanisms, such as disconnecting the battery pack from the load or activating cell balancing to equalize charge levels. The IC communicates with the battery management system through the I2C interface, providing real-time data and status updates.

Detailed Application Field Plans

BQ76925PWR finds applications in various fields where lithium-ion and lithium-polymer battery packs require reliable monitoring and protection. Some notable application areas include:

  1. Electric Vehicles (EVs): Ensures safe operation and optimal performance of EV battery packs.
  2. Portable Electronics: Protects battery packs in smartphones, tablets, and laptops from potential hazards.
  3. Energy Storage Systems: Monitors and safeguards battery packs used in renewable energy storage applications.
  4. Medical Devices: Provides critical protection for battery-powered medical equipment.

Detailed and Complete Alternative Models

  1. BQ76930PWR: Similar functionality with additional features like current sensing and fuel gauge capabilities.
  2. LTC6804-2: Offers similar cell monitoring and balancing features with extended voltage measurement range.
  3. MAX14920: Provides comprehensive battery management functions along with isolated communication interface.

(Note: The above alternative models are just a few examples; there are several other alternatives available in the market.)

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רשום 10 שאלות ותשובות נפוצות הקשורות ליישום של BQ76925PWR בפתרונות טכניים

Sure! Here are 10 common questions and answers related to the application of BQ76925PWR in technical solutions:

  1. Question: What is the BQ76925PWR?
    Answer: The BQ76925PWR is a battery management system (BMS) IC designed for monitoring and protecting lithium-ion battery packs.

  2. Question: What is the maximum number of cells that can be monitored using the BQ76925PWR?
    Answer: The BQ76925PWR can monitor up to 6 series-connected lithium-ion battery cells.

  3. Question: How does the BQ76925PWR protect the battery pack?
    Answer: The BQ76925PWR provides overvoltage, undervoltage, and overcurrent protection to prevent damage to the battery cells.

  4. Question: Can the BQ76925PWR balance the individual cell voltages?
    Answer: Yes, the BQ76925PWR has built-in balancing functionality to equalize the voltage across the cells in a battery pack.

  5. Question: What communication interface does the BQ76925PWR support?
    Answer: The BQ76925PWR supports I2C communication interface for easy integration with microcontrollers or other devices.

  6. Question: Is the BQ76925PWR suitable for automotive applications?
    Answer: Yes, the BQ76925PWR is designed to meet the stringent requirements of automotive applications, including temperature range and reliability.

  7. Question: Can the BQ76925PWR measure battery temperature?
    Answer: Yes, the BQ76925PWR includes a temperature sensor input to monitor the battery temperature.

  8. Question: Does the BQ76925PWR have built-in cell voltage measurement accuracy?
    Answer: Yes, the BQ76925PWR has a high-accuracy cell voltage measurement with a typical accuracy of ±5 mV.

  9. Question: Can the BQ76925PWR be used in multi-cell battery packs?
    Answer: Yes, the BQ76925PWR can be cascaded to monitor and protect larger battery packs by connecting multiple ICs together.

  10. Question: Is there any evaluation module available for the BQ76925PWR?
    Answer: Yes, Texas Instruments provides an evaluation module (EVM) for the BQ76925PWR, which allows easy testing and prototyping of the IC in real-world applications.

Please note that these answers are general and may vary depending on the specific implementation and requirements of your technical solution.