BQ29312PW - English Editing Encyclopedia Entry

Product Overview

Category

BQ29312PW belongs to the category of integrated circuits (ICs) specifically designed for battery protection and monitoring.

Use

This product is primarily used in applications where battery protection is crucial, such as in portable electronic devices, power banks, electric vehicles, and renewable energy systems.

Characteristics

• Battery protection: BQ29312PW provides comprehensive protection for lithium-ion batteries against overcharging, over-discharging, and overcurrent conditions.
• Monitoring capabilities: It offers accurate voltage and current monitoring, enabling precise battery management.
• High integration: This IC integrates multiple functions, including voltage protection, current sensing, and temperature monitoring, into a single package.
• Low power consumption: BQ29312PW is designed to minimize power consumption, ensuring efficient battery usage.
• Robust design: It features built-in fault detection and reporting mechanisms, enhancing system reliability.

Package and Quantity

BQ29312PW is available in a small outline package (SOP) with 20 pins. Each package contains one unit of the IC.

Specifications

• Supply voltage range: 2.5V to 16V
• Operating temperature range: -40°C to +85°C
• Overvoltage protection threshold: Adjustable from 3V to 4.6V
• Undervoltage protection threshold: Adjustable from 1.8V to 3.5V
• Overcurrent protection threshold: Adjustable from 10mV to 100mV
• Current sense gain accuracy: ±5%
• Standby current: Less than 10µA

Pin Configuration

The BQ29312PW IC has a total of 20 pins, each serving a specific function. The pin configuration is as follows:

1. VCC: Power supply input
2. GND: Ground reference
3. VREF: Reference voltage output
4. SDA: Serial data input/output for communication
5. SCL: Serial clock input for communication
6. ALERT: Output signal indicating fault conditions
7. TS1: Temperature sense input 1
8. TS2: Temperature sense input 2
9. BAT: Battery voltage sense input
10. VC1: Cell 1 voltage sense input
11. VC2: Cell 2 voltage sense input
12. VC3: Cell 3 voltage sense input
13. VC4: Cell 4 voltage sense input
14. VC5: Cell 5 voltage sense input
15. VC6: Cell 6 voltage sense input
16. VC7: Cell 7 voltage sense input
17. VC8: Cell 8 voltage sense input
18. VC9: Cell 9 voltage sense input
19. VC10: Cell 10 voltage sense input
20. VC11: Cell 11 voltage sense input

Functional Features

• Overvoltage protection: BQ29312PW monitors the battery voltage and disconnects it from the load when it exceeds the set threshold.
• Undervoltage protection: It prevents excessive discharge by disconnecting the battery when its voltage drops below the specified threshold.
• Overcurrent protection: The IC detects high current flow and interrupts the circuit to prevent damage to the battery or connected devices.
• Temperature monitoring: BQ29312PW measures the temperature of the battery pack, enabling thermal management and preventing overheating.
• Communication interface: It supports I2C communication protocol for easy integration with microcontrollers or battery management systems.

Advantages and Disadvantages

Advantages

• Comprehensive battery protection against various faults
• Accurate voltage and current monitoring
• High integration reduces component count and PCB space
• Low power consumption prolongs battery life
• Built-in fault detection enhances system reliability

Disadvantages

• Limited to lithium-ion battery applications
• Requires additional external components for complete battery management system implementation

Working Principles

BQ29312PW operates by continuously monitoring the battery voltage, current, and temperature. It compares these values with the predefined thresholds to detect abnormal conditions. When a fault is detected, it triggers the appropriate protection mechanism, such as disconnecting the battery from the load or generating an alert signal.

The IC communicates with the microcontroller or battery management system through the I2C interface, providing real-time data on battery status and fault conditions.

Detailed Application Field Plans

BQ29312PW finds extensive application in various fields, including:

1. Portable electronic devices: Ensures safe and reliable operation of smartphones, tablets, and wearable devices.
2. Power banks: Protects the battery cells from overcharging and overcurrent, ensuring efficient power delivery.
3. Electric vehicles: Safeguards the battery pack against voltage spikes, over-discharge, and excessive current flow, enhancing vehicle safety.
4. Renewable energy systems: Provides battery protection and monitoring in solar power storage