BQ77908ADBTR - English Editing Encyclopedia Entry

Product Overview

Category

BQ77908ADBTR belongs to the category of integrated circuits (ICs) specifically designed for battery management systems.

Use

This product is primarily used in applications that require accurate monitoring and protection of lithium-ion battery packs.

Characteristics

• High precision voltage and current monitoring
• Advanced protection features
• Low power consumption
• Compact size
• Wide operating temperature range

Package

BQ77908ADBTR is available in a small outline transistor (SOT) package, which ensures easy integration into various electronic devices.

Essence

The essence of BQ77908ADBTR lies in its ability to provide reliable and efficient battery management, ensuring the safety and longevity of lithium-ion battery packs.

Packaging/Quantity

This product is typically packaged in reels, with each reel containing a specific quantity of BQ77908ADBTR ICs. The exact quantity per reel may vary depending on the manufacturer's specifications.

Specifications

• Input Voltage Range: 2.7V to 4.8V
• Operating Temperature Range: -40°C to +85°C
• Number of Pins: 20
• Communication Interface: I2C
• Battery Cell Balancing: Supported
• Overvoltage Protection Threshold: Adjustable
• Undervoltage Protection Threshold: Adjustable
• Overcurrent Protection Threshold: Adjustable

Detailed Pin Configuration

1. VDD: Power supply input
2. GND: Ground reference
3. SDA: I2C data line
4. SCL: I2C clock line
5. ALERT: Interrupt output
6. BAT: Battery pack positive terminal
7. TS1: Thermistor input 1
8. TS2: Thermistor input 2
9. TS3: Thermistor input 3
10. TS4: Thermistor input 4
11. TS5: Thermistor input 5
12. TS6: Thermistor input 6
13. TS7: Thermistor input 7
14. TS8: Thermistor input 8
15. TS9: Thermistor input 9
16. TS10: Thermistor input 10
17. TS11: Thermistor input 11
18. TS12: Thermistor input 12
19. TS13: Thermistor input 13
20. TS14: Thermistor input 14

Functional Features

• Accurate voltage and current monitoring for each battery cell
• Overvoltage and undervoltage protection
• Overcurrent protection
• Battery cell balancing to ensure uniform charge levels
• Temperature monitoring through multiple thermistor inputs
• I2C communication interface for easy integration with microcontrollers

Advantages and Disadvantages

Advantages

• High precision monitoring ensures optimal battery performance
• Advanced protection features safeguard against potential hazards
• Low power consumption prolongs battery life
• Compact size allows for flexible integration in various applications
• Wide operating temperature range enables usage in extreme environments

Disadvantages

• Limited to lithium-ion battery pack management only
• Requires additional external components for complete battery management system implementation

Working Principles

BQ77908ADBTR operates by continuously monitoring the voltage, current, and temperature of each battery cell within a lithium-ion battery pack. It utilizes an internal algorithm to determine if any parameters exceed safe limits. If an abnormal condition is detected, such as overvoltage, undervoltage, or overcurrent, the IC triggers appropriate protection mechanisms to prevent damage to the battery cells and surrounding circuitry.

Detailed Application Field Plans

BQ77908ADBTR finds extensive application in various fields, including: 1. Electric vehicles (EVs) and hybrid electric vehicles (HEVs) 2. Portable electronic devices 3. Energy storage systems 4. Uninterruptible power supplies (UPS) 5. Industrial equipment

Detailed and Complete Alternative Models

1. BQ77910ADBTR: Similar to BQ77908ADBTR with additional features for higher voltage battery packs.
2. BQ77920ADBTR: Advanced version with enhanced communication capabilities and extended temperature range.

These alternative models provide similar functionality but cater to specific requirements or offer additional features based on the application's needs.

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