BQ29410DCT3R - English Editing Encyclopedia Entry

Product Overview

Category

BQ29410DCT3R 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)
• Small package size: SOT-23-6
• High accuracy in voltage thresholds
• Fast response time

Package and Quantity

The BQ29410DCT3R is available in a small outline transistor (SOT) package with six pins. It is typically sold in reels containing a quantity of 3000 units.

Specifications

• Supply voltage range: 2.5V to 4.8V
• Operating temperature range: -40°C to +85°C
• Overcharge detection voltage: 4.35V (typical)
• Overdischarge detection voltage: 2.5V (typical)
• Short-circuit detection delay: 20ms (typical)
• Quiescent current: 6µA (typical)

Detailed Pin Configuration

The BQ29410DCT3R has six pins arranged as follows:

1. VDD: Supply voltage input
2. GND: Ground reference
3. BAT: Battery connection
4. OUT: Output pin for external control circuitry
5. SRP: Sense resistor positive terminal
6. SRN: Sense resistor negative terminal

Functional Features

1. Overcharge Protection: Monitors the battery voltage and disconnects it from the charging source when it exceeds the predefined threshold.
2. Overdischarge Protection: Prevents the battery voltage from dropping below a safe level by disconnecting it from the load.
3. Short-Circuit Protection: Detects excessive current flow and isolates the battery to prevent damage.
4. Fault Detection: Provides an output signal indicating the occurrence of any protection event.

Advantages and Disadvantages

Advantages

• Wide operating voltage range allows compatibility with various battery types.
• Low quiescent current minimizes power consumption.
• Small package size enables space-saving designs.
• High accuracy in voltage thresholds ensures precise protection.

Disadvantages

• Limited to lithium-ion and lithium-polymer batteries, not suitable for other battery chemistries.
• Requires an external control circuitry for proper operation.

Working Principles

The BQ29410DCT3R utilizes a combination of voltage comparators and logic circuitry to monitor the battery voltage continuously. When the voltage exceeds or falls below the predefined thresholds, the corresponding protection mechanism is triggered, disconnecting the battery from the charging source or load.

Detailed Application Field Plans

The BQ29410DCT3R finds applications 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 medical devices
4. Power banks and portable chargers
5. Electric vehicles (EVs) and hybrid electric vehicles (HEVs)

Detailed and Complete Alternative Models

1. BQ29700: Offers additional features like cell balancing and temperature monitoring.
2. MAX14920: Provides similar battery protection functions with enhanced fault detection capabilities.
3. LTC6803: Suitable for multi-cell battery packs with integrated cell voltage measurement.

These alternative models offer similar functionalities to the BQ29410DCT3R but may have different specifications and pin configurations.

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