BQ29400PW

Overview

Category: Integrated Circuit (IC)

Use: Battery Protection IC

Characteristics: - Provides overvoltage, undervoltage, and overcurrent protection for lithium-ion/polymer battery packs - Monitors individual cell voltages and temperature - Controls charging and discharging of the battery pack - Offers high accuracy and low power consumption

Package: PowerPAD HTSSOP-20

Essence: The BQ29400PW is a battery protection IC designed to safeguard lithium-ion/polymer battery packs from potential damage caused by overvoltage, undervoltage, and overcurrent conditions. It ensures safe and reliable operation of battery-powered devices.

Packaging/Quantity: The BQ29400PW is available in a PowerPAD HTSSOP-20 package. The quantity per package may vary depending on the supplier.

Specifications

• Input Voltage Range: 2.5V to 16V
• Overvoltage Threshold Range: 3.9V to 4.6V (adjustable)
• Undervoltage Threshold Range: 1.8V to 3.2V (adjustable)
• Overcurrent Threshold Range: 0.5A to 10A (adjustable)
• Operating Temperature Range: -40°C to +85°C

Detailed Pin Configuration

The BQ29400PW has a total of 20 pins. Here is a detailed pin configuration:

1. VDD: Power supply input
2. GND: Ground reference
3. SDA: I2C data line
4. SCL: I2C clock line
5. ALERT: Open-drain output for alert indication
6. TS: Thermistor input for temperature monitoring
7. VC1: Cell 1 voltage monitor input
8. VC2: Cell 2 voltage monitor input
9. VC3: Cell 3 voltage monitor input
10. VC4: Cell 4 voltage monitor input
11. VC5: Cell 5 voltage monitor input
12. VC6: Cell 6 voltage monitor input
13. VC7: Cell 7 voltage monitor input
14. VC8: Cell 8 voltage monitor input
15. VSS: Negative terminal of the battery pack
16. BAT: Positive terminal of the battery pack
17. CHG: Charge control output
18. DSG: Discharge control output
19. VREF: Reference voltage output
20. VDDP: Power supply input for internal circuitry

Functional Features

1. Overvoltage Protection: Monitors cell voltages and triggers protection if any cell voltage exceeds the overvoltage threshold.
2. Undervoltage Protection: Monitors cell voltages and activates protection if any cell voltage falls below the undervoltage threshold.
3. Overcurrent Protection: Detects excessive current flow and initiates protection to prevent damage to the battery pack.
4. Temperature Monitoring: Measures the temperature using an external thermistor to ensure safe operation within specified limits.
5. Charge and Discharge Control: Controls the charging and discharging process of the battery pack, ensuring optimal performance and longevity.

Advantages and Disadvantages

Advantages: - Provides comprehensive protection for lithium-ion/polymer battery packs - High accuracy in monitoring and controlling battery parameters - Low power consumption for improved efficiency - Adjustable thresholds for customization based on specific requirements

Disadvantages: - Limited to use with lithium-ion/polymer battery packs only - Requires additional external components for complete battery protection system implementation

Working Principles

The BQ29400PW operates by continuously monitoring the individual cell voltages and temperature of the battery pack. It compares these values with the preset thresholds to determine if any protection action is required. If an overvoltage, undervoltage, or overcurrent condition is detected, the IC triggers the appropriate control outputs to protect the battery pack from potential damage.

Detailed Application Field Plans

The BQ29400PW is widely used in various battery-powered devices that rely on lithium-ion/polymer battery packs. Some common application fields include:

1. Electric Vehicles (EVs) and Hybrid Electric Vehicles (HEVs)
2. Portable Electronic Devices (e.g., smartphones, tablets, laptops)
3. Power Tools
4. Medical Devices
5. Energy Storage Systems

Detailed and Complete Alternative Models

1. BQ29401PW: Similar to BQ29400PW but with additional features for enhanced battery protection.
2. BQ29402PW: A lower-cost alternative with basic battery protection capabilities.
3. BQ29403PW: Designed specifically for high-current applications, offering robust protection for demanding environments.

These alternative models provide options based on specific requirements and budget considerations while maintaining essential battery protection functionality.

*Word count: