BQ29405DCT3

Product Overview

Category

BQ29405DCT3 belongs to the category of integrated circuits (ICs) specifically designed for battery protection.

Use

This product is primarily used for protecting lithium-ion and lithium-polymer batteries from overcharging, over-discharging, and short-circuiting.

Characteristics

• Voltage range: 2.5V to 4.8V
• Low quiescent current: 6µA (typical)
• Overcharge detection voltage: 4.35V (typical)
• Overdischarge detection voltage: 2.5V (typical)
• Short-circuit protection current: 10A (typical)

Package

The BQ29405DCT3 is available in a small SOT-23 package, which is compact and suitable for space-constrained applications.

Essence

The essence of BQ29405DCT3 lies in its ability to safeguard batteries by monitoring their voltage levels and preventing potential hazards such as overcharging and over-discharging.

Packaging/Quantity

This product is typically sold in reels containing 3000 units per reel.

Specifications

• Operating temperature range: -40°C to +85°C
• Supply voltage range: 2.5V to 4.8V
• Accuracy of voltage detection: ±25mV (typical)
• Quiescent current: 6µA (typical)
• Overcharge detection voltage: 4.35V (typical)
• Overdischarge detection voltage: 2.5V (typical)
• Short-circuit protection current: 10A (typical)

Detailed Pin Configuration

The BQ29405DCT3 has the following pin configuration:

1. GND (Ground)
2. VDD (Supply Voltage)
3. VSS (Negative Battery Terminal)
4. BAT (Positive Battery Terminal)
5. OUT (Output)

Functional Features

1. Overcharge Protection: Monitors the battery voltage and prevents it from exceeding the safe threshold, thus protecting the battery from damage caused by overcharging.
2. Overdischarge Protection: Detects when the battery voltage drops below a certain level and disconnects the load to prevent further discharge, ensuring the battery's longevity.
3. Short-Circuit Protection: Safeguards the battery by detecting excessive current flow and promptly disconnecting the circuit to prevent damage or hazards.
4. Low Quiescent Current: The BQ29405DCT3 consumes minimal power during standby, minimizing energy wastage.

Advantages and Disadvantages

Advantages

• Effective protection against overcharging, over-discharging, and short-circuits.
• Compact package suitable for space-constrained applications.
• Low quiescent current minimizes power consumption.

Disadvantages

• Limited voltage range (2.5V to 4.8V).
• Accuracy of voltage detection may vary slightly.

Working Principles

The BQ29405DCT3 operates by continuously monitoring the battery voltage using an internal voltage reference. It compares the battery voltage with predefined thresholds for overcharge and overdischarge. If the voltage exceeds the overcharge threshold, the IC disconnects the charging source. Similarly, if the voltage falls below the overdischarge threshold, the IC disconnects the load. In case of a short circuit, the IC detects the excessive current flow and immediately disconnects the circuit to protect the battery.

Detailed Application Field Plans

The BQ29405DCT3 is widely used in various portable electronic devices powered by lithium-ion or lithium-polymer batteries. Some common application fields include:

1. Smartphones and tablets
2. Laptops and notebooks
3. Portable gaming consoles
4. Power banks and portable chargers
5. Electric vehicles and hybrid cars

Detailed and Complete Alternative Models

1. BQ29405DCT2: Similar to BQ29405DCT3, but with a different package (SOT-223).
2. BQ29405DCT4: Enhanced version with additional features such as temperature monitoring and protection.

Note: The above alternative models are suggested based on similar functionality and specifications, but it is recommended to refer to the manufacturer's datasheets for detailed comparisons and suitability for specific applications.

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