BQ294704DSGT - English Editing Encyclopedia Entry

Product Overview

Category

BQ294704DSGT belongs to the category of integrated circuits (ICs).

Use

This IC is primarily used for battery protection in various electronic devices.

Characteristics

• Package: The BQ294704DSGT comes in a small outline package (SOT-23) which is widely used for surface mount applications.
• Essence: It is designed to provide accurate and reliable protection for lithium-ion/polymer batteries.
• Packaging/Quantity: The IC is typically sold in reels or tubes, with each reel/tube containing a specific quantity of units.

Specifications

The BQ294704DSGT has the following specifications:

• Input Voltage Range: 2.5V to 28V
• Overvoltage Threshold: 4.35V ± 25mV
• Undervoltage Threshold: 2.4V ± 50mV
• Overcurrent Threshold: 10A ± 3A
• Operating Temperature Range: -40°C to +85°C

Detailed Pin Configuration

The BQ294704DSGT has six pins, each serving a specific function:

1. VDD: Power supply input pin.
2. GND: Ground reference pin.
3. SDA: Serial data input/output pin.
4. SCL: Serial clock input pin.
5. OUT: Open-drain output pin indicating fault conditions.
6. STAT: Output pin indicating device status.

Functional Features

The key functional features of the BQ294704DSGT include:

• Overvoltage Protection: Monitors the battery voltage and disconnects it from the load when it exceeds the preset threshold.
• Undervoltage Protection: Cuts off the battery from the load when its voltage drops below the specified threshold.
• Overcurrent Protection: Detects excessive current flow and disconnects the battery to prevent damage.
• Temperature Monitoring: Monitors the battery temperature and triggers protection mechanisms if it exceeds safe limits.

Advantages and Disadvantages

Advantages

• Accurate and reliable battery protection.
• Compact SOT-23 package for easy integration.
• Wide input voltage range allows compatibility with various battery types.
• Overcurrent and temperature monitoring enhance safety.

Disadvantages

• Limited to lithium-ion/polymer battery applications.
• Requires additional external components for complete battery protection.

Working Principles

The BQ294704DSGT operates based on a combination of voltage, current, and temperature monitoring. It continuously measures these parameters and compares them against preset thresholds. If any parameter exceeds the specified limit, the IC triggers the appropriate protection mechanism, disconnecting the battery from the load.

Detailed Application Field Plans

The BQ294704DSGT finds applications in various electronic devices that utilize lithium-ion or lithium-polymer batteries. Some common application fields include:

1. Portable Electronics: Smartphones, tablets, laptops, and portable gaming devices.
2. Power Tools: Cordless drills, saws, and other battery-powered tools.
3. Electric Vehicles: Battery management systems in electric cars, bikes, and scooters.
4. Energy Storage Systems: Battery protection in solar power systems and uninterruptible power supplies (UPS).

Detailed and Complete Alternative Models

1. BQ29209: Similar battery protection IC with extended operating temperature range (-40°C to +125°C).
2. MAX14920: Integrated battery protection IC with additional features like cell balancing and fuel gauge functionality.
3. LTC6804: Multi-cell battery monitor and protector suitable for high-voltage battery packs.

These alternative models offer similar functionalities and can be considered as alternatives to the BQ294704DSGT depending on specific requirements.

In conclusion, the BQ294704DSGT is a compact and reliable integrated circuit designed for battery protection in various electronic devices. Its accurate monitoring and protection mechanisms make it an essential component for ensuring the safety and longevity of lithium-ion/polymer batteries.

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