BQ76925PW

Product Overview

Category

BQ76925PW belongs to the category of integrated circuits (ICs) used in battery management systems (BMS).

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
• Cell balancing functionality
• Integrated analog-to-digital converter (ADC)
• Low power consumption

Package

BQ76925PW is available in a small outline integrated circuit (SOIC) package.

Essence

The essence of BQ76925PW lies in its ability to ensure the 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 or tubes containing a specified quantity, such as 250 units per reel.

Specifications

• Supply voltage range: 2.7V to 16V
• Number of cells supported: Up to 6 series cells
• Voltage measurement accuracy: ±10mV
• Temperature measurement accuracy: ±1°C
• Balancing current: Up to 100mA per cell
• Operating temperature range: -40°C to +85°C

Detailed Pin Configuration

BQ76925PW has a total of 20 pins, each serving a specific function. The pin configuration is as follows:

1. VSS - Ground
2. VDD - Power supply
3. BAT - Battery pack connection
4. VCxP - Positive terminal of cell x
5. VCxN - Negative terminal of cell x
6. VREF - Reference voltage output
7. TS1 - Temperature sensor input 1
8. TS2 - Temperature sensor input 2
9. TS3 - Temperature sensor input 3
10. TS4 - Temperature sensor input 4
11. TS5 - Temperature sensor input 5
12. TS6 - Temperature sensor input 6
13. CBxP - Positive terminal of cell x for balancing
14. CBxN - Negative terminal of cell x for balancing
15. ALERT - Alert output
16. SDA - I2C data line
17. SCL - I2C clock line
18. VSS - Ground
19. VDD - Power supply
20. VSS - Ground

Functional Features

1. Voltage Monitoring: BQ76925PW accurately measures the voltage of each cell in a battery pack, ensuring optimal performance and preventing overvoltage or undervoltage conditions.

2. Temperature Monitoring: The IC monitors the temperature of the battery pack to prevent overheating and damage.

3. Overvoltage/Undervoltage Protection: BQ76925PW triggers an alert or takes appropriate action when the voltage exceeds or falls below the safe operating range.

4. Cell Balancing: This IC supports active cell balancing, redistributing charge between cells to ensure uniform voltage levels.

5. Integrated ADC: The built-in analog-to-digital converter enables precise voltage and temperature measurements.

Advantages and Disadvantages

Advantages

• High accuracy monitoring and protection features
• Integrated cell balancing functionality
• Low power consumption
• Wide operating temperature range

Disadvantages

• Limited support for a maximum of 6 series cells
• Requires external temperature sensors for accurate temperature monitoring

Working Principles

BQ76925PW operates based on the principles of voltage and temperature measurement. It continuously monitors the voltage and temperature of each cell in the battery pack using its integrated ADC. If any abnormality is detected, such as overvoltage or overtemperature, the IC triggers an alert or activates the appropriate protection mechanism.

Detailed Application Field Plans

BQ76925PW is widely used in various applications that require reliable battery management, including: - Electric vehicles - Portable electronic devices - Energy storage systems - Uninterruptible power supplies (UPS) - Solar power systems

Detailed and Complete Alternative Models

1. BQ76930PW: Similar to BQ76925PW but supports up to 10 series cells.
2. BQ76940PW: Offers additional features such as current sensing and communication interfaces.
3. BQ76950PW: Designed for higher voltage battery packs with support for up to 15 series cells.

These alternative models provide similar functionality to BQ76925PW but cater to different requirements based on the number of cells and additional features needed.

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