BQ29412DCTT - English Editing Encyclopedia Entry

Product Overview

Category

The BQ29412DCTT belongs to the category of integrated circuits (ICs) specifically designed for battery protection.

Use

This IC 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: 10µA (typical)
• High accuracy voltage detection: ±25mV (typical)
• Overcharge detection voltage: 4.1V to 4.35V (programmable)
• Overdischarge detection voltage: 2.0V to 3.0V (programmable)
• Short-circuit detection delay time: 5ms (typical)

Package

The BQ29412DCTT is available in a small SOT-23 package, which is suitable for space-constrained applications.

Essence

The essence of the BQ29412DCTT lies in its ability to safeguard lithium-ion and lithium-polymer batteries by monitoring their voltage levels and preventing potential hazards such as overcharging, over-discharging, and short-circuiting.

Packaging/Quantity

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

Specifications

• Supply voltage range: 2.5V to 4.8V
• Operating temperature range: -40°C to +85°C
• Quiescent current: 10µA (typical)
• Overcharge detection voltage range: 4.1V to 4.35V (programmable)
• Overdischarge detection voltage range: 2.0V to 3.0V (programmable)
• Short-circuit detection delay time: 5ms (typical)

Detailed Pin Configuration

The BQ29412DCTT has the following pin configuration:

1. VDD - Supply voltage input
2. GND - Ground reference
3. SDA - Serial data input/output for communication
4. SCL - Serial clock input for communication
5. OUT - Open-drain output indicating battery status
6. RST - Reset input for device initialization

Functional Features

• Overcharge protection: The IC monitors the battery voltage and disconnects the charging source when it exceeds the programmed threshold.
• Overdischarge protection: It prevents the battery from discharging below the set threshold by disconnecting the load.
• Short-circuit protection: The IC detects short-circuits and quickly disconnects the battery to prevent damage.
• Reset function: A reset input allows for device initialization and restart after a fault condition.

Advantages and Disadvantages

Advantages

• High accuracy voltage detection ensures precise battery protection.
• Low quiescent current minimizes power consumption.
• Small package size enables use in space-constrained applications.
• Programmable thresholds provide flexibility for different battery chemistries.

Disadvantages

• Limited to lithium-ion and lithium-polymer battery protection.
• Requires external components for complete battery protection circuitry.

Working Principles

The BQ29412DCTT operates by continuously monitoring the battery voltage using an internal voltage reference. When the voltage exceeds the programmed overcharge threshold, the IC disconnects the charging source. Similarly, if the voltage drops below the programmed overdischarge threshold, the IC disconnects the load. In case of a short-circuit, the IC rapidly disconnects the battery to prevent damage. The reset input allows for device initialization and restart after a fault condition.

Detailed Application Field Plans

The BQ29412DCTT is widely used in various portable electronic devices, including: - Smartphones - Tablets - Laptops - Portable power banks - Wearable devices

Detailed and Complete Alternative Models

1. BQ29412DCTR: Similar to BQ29412DCTT but available in a tape and reel package.
2. BQ29412DCTRG4: RoHS-compliant version of BQ29412DCTT with the same specifications.

These alternative models provide similar functionality and can be used as drop-in replacements for the BQ29412DCTT.

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