BQ24271YFFT - English Editing Encyclopedia Entry

Product Overview

Category

The BQ24271YFFT belongs to the category of integrated circuits (ICs) specifically designed for battery charging applications.

Use

This IC is primarily used for managing and controlling the charging process of lithium-ion batteries in various electronic devices, such as smartphones, tablets, portable media players, and other portable electronic devices.

Characteristics

• The BQ24271YFFT offers a high level of integration, combining multiple functions required for battery charging into a single chip.
• It supports fast charging protocols, enabling efficient and rapid charging of lithium-ion batteries.
• The IC incorporates advanced safety features to protect the battery and the device from overcharging, overvoltage, and overcurrent conditions.
• It provides accurate monitoring and control of the charging parameters, ensuring optimal battery performance and longevity.

Package and Quantity

The BQ24271YFFT is available in a small form factor package, such as a 20-pin QFN (Quad Flat No-Lead) package. The exact packaging and quantity may vary depending on the manufacturer and supplier.

Specifications

• Input Voltage Range: 4.35V to 6.45V
• Charging Voltage Range: 3.5V to 4.44V
• Maximum Charging Current: 2A
• Operating Temperature Range: -40°C to +85°C
• Efficiency: Up to 95%
• Standby Current: <100µA

Pin Configuration (Detailed)

1. VBUS: Input voltage pin for the power source.
2. PGND: Ground reference for the power stage.
3. SYS: System output voltage pin.
4. TS: Thermistor input for temperature monitoring.
5. STAT: Status output pin indicating charging status.
6. ISET: Charging current setting pin.
7. ILIM: Input current limit setting pin.
8. TS/NTC: Thermistor input or NTC temperature sensing input.
9. BAT: Battery voltage sense pin.
10. INT: Interrupt output pin for charging status changes.
11. SDA: I2C data line for communication.
12. SCL: I2C clock line for communication.
13. EN/SET: Enable and I2C address selection pin.
14. SRN: Serial resistor network for I2C address selection.
15. VDD: Power supply pin for internal circuitry.
16. PG: Power good output indicating the presence of a valid input source.
17. TS/NTC: Thermistor input or NTC temperature sensing input.
18. TS/NTC: Thermistor input or NTC temperature sensing input.
19. GND: Ground reference for the IC.
20. VBAT: Battery voltage input pin.

Functional Features

• Fast Charging: The BQ24271YFFT supports various fast charging protocols, such as USB BC1.2, Apple 2.4A, and Qualcomm Quick Charge 2.0/3.0. This enables rapid charging of compatible devices.
• Thermal Regulation: The IC incorporates thermal regulation to prevent overheating during the charging process. It adjusts the charging current based on the battery and ambient temperature, ensuring safe operation.
• Dynamic Power Management: The BQ24271YFFT optimizes power delivery by dynamically adjusting the charging current based on the available input power. This allows efficient charging even when connected to low-power sources.
• Safety Protection: The IC includes comprehensive safety features like overvoltage protection, overcurrent protection, and thermal shutdown. These protections safeguard the battery and the device from potential damage.

Advantages and Disadvantages

Advantages

• High integration reduces external component count and PCB space requirements.
• Supports multiple fast charging protocols, ensuring compatibility with various devices.
• Advanced safety features protect the battery and device from potential hazards.
• Efficient power management maximizes charging speed and minimizes energy loss.

Disadvantages

• Limited availability of alternative models from different manufacturers.
• May require additional external components for specific applications or customization.

Working Principles

The BQ24271YFFT operates based on a switching regulator architecture. It utilizes a combination of voltage and current regulation techniques to control the charging process. The IC monitors the battery voltage, input voltage, and temperature to adjust the charging parameters dynamically. It regulates the charging current and voltage to ensure safe and efficient charging while maintaining optimal battery performance.

Detailed Application Field Plans

The BQ24271YFFT is widely used in various portable electronic devices that rely on lithium-ion batteries for power. Some common application fields include:

1. Smartphones and Tablets: The IC is extensively employed in smartphones and tablets to provide fast and reliable charging capabilities.
2. Portable Media Players: It enables efficient charging of portable media players, ensuring uninterrupted entertainment on the go.
3. Wearable Devices: The BQ24271YFFT is suitable for wearable