BQ29412PWRG4 - English Editing Encyclopedia Entry

Product Overview

Category

The BQ29412PWRG4 belongs to the category of integrated circuits (ICs) specifically designed for battery protection.

Use

This IC is primarily used for protecting rechargeable lithium-ion (Li-ion) and lithium-polymer (LiPo) batteries from overcharging, over-discharging, and overcurrent conditions.

Characteristics

• Battery voltage monitoring and protection
• Overcharge and over-discharge detection
• Overcurrent detection and protection
• Low quiescent current consumption
• Wide operating temperature range
• Small form factor

Package

The BQ29412PWRG4 is available in a small-sized 8-pin TSSOP (Thin Shrink Small Outline Package) package.

Essence

The essence of the BQ29412PWRG4 lies in its ability to safeguard Li-ion and LiPo batteries by monitoring their voltage levels and providing protection against various fault conditions.

Packaging/Quantity

The BQ29412PWRG4 is typically sold in reels containing a quantity of 2500 units per reel.

Specifications

• Supply Voltage Range: 2.5V to 6V
• Operating Temperature Range: -40°C to +85°C
• Quiescent Current: 10µA (typical)
• Overcharge Detection Voltage: 4.2V (typical)
• Overdischarge Detection Voltage: 2.5V (typical)
• Overcurrent Detection Threshold: Adjustable

Detailed Pin Configuration

The BQ29412PWRG4 features the following pin configuration:

1. VDD - Power supply input
2. GND - Ground reference
3. BAT - Battery connection
4. PROTECT - Output indicating protection status
5. OCSET - Overcurrent threshold setting
6. VSS - Negative supply input
7. VREF - Reference voltage output
8. VDDP - Power supply for internal circuitry

Functional Features

1. Battery Protection: The BQ29412PWRG4 continuously monitors the battery voltage and triggers protection mechanisms to prevent overcharging, over-discharging, and overcurrent situations.
2. Overcharge Detection: It detects when the battery voltage exceeds a predefined threshold, signaling the need to stop charging.
3. Overdischarge Detection: It detects when the battery voltage drops below a certain level, indicating the need to stop discharging.
4. Overcurrent Detection: The IC can sense excessive current flow and activate protection measures to prevent damage to the battery or connected devices.
5. Low Quiescent Current: The BQ29412PWRG4 consumes minimal current during standby, ensuring efficient battery usage.
6. Wide Operating Temperature Range: It can operate reliably in a wide range of temperatures, making it suitable for various environments.
7. Small Form Factor: The compact package size allows for easy integration into space-constrained applications.

Advantages and Disadvantages

Advantages

• Effective battery protection against overcharging, over-discharging, and overcurrent conditions.
• Low quiescent current consumption prolongs battery life.
• Wide operating temperature range enables usage in diverse environments.
• Compact form factor facilitates integration into small-sized devices.

Disadvantages

• Limited to Li-ion and LiPo battery protection; not suitable for other battery chemistries.
• Requires additional external components for complete battery protection implementation.

Working Principles

The BQ29412PWRG4 operates by continuously monitoring the battery voltage through its dedicated pin. It compares the voltage with predefined thresholds to detect overcharging, over-discharging, and overcurrent conditions. Upon detecting any fault, it triggers the PROTECT output pin, indicating the activation of protection measures. The IC's internal circuitry ensures low quiescent current consumption and accurate voltage monitoring.

Detailed Application Field Plans

The BQ29412PWRG4 finds applications in various fields, including but not limited to: - Portable electronic devices (e.g., smartphones, tablets, laptops) - Power banks and portable chargers - Electric vehicles and hybrid electric vehicles - Uninterruptible power supplies (UPS) - Solar energy storage systems

Detailed and Complete Alternative Models

1. BQ29700 - Battery protection IC with additional features like cell balancing and fuel gauge functionality.
2. MAX14920 - Integrated battery protector with overvoltage, undervoltage, and overcurrent detection capabilities.
3. LTC6804 - Multicell battery monitor and protector suitable for high-voltage battery packs.

(Note: This list is not exhaustive and serves as a starting point for exploring alternative models.)

---

Word count: 550 words