BQ24261YFFR - English Editing Encyclopedia Entry

Product Overview

Category: Integrated Circuits (ICs)

Use: Battery Charger IC

Characteristics: - Highly integrated single-cell Li-Ion battery charger - Supports USB input and I2C interface for control and monitoring - Provides various charging modes and protection features - Compact and efficient design

Package: DSBGA (1.63mm x 1.63mm), 10-ball

Essence: The BQ24261YFFR is a small-sized, highly integrated battery charger IC designed for single-cell Li-Ion batteries. It offers multiple charging modes and protection features, making it suitable for various portable electronic devices.

Packaging/Quantity: The BQ24261YFFR is available in a DSBGA package, which measures 1.63mm x 1.63mm. It is typically sold in reels of 3000 units.

Specifications

• Input Voltage Range: 3.9V to 6.45V
• Charging Voltage Range: 3.5V to 4.44V
• Maximum Charge Current: 2A
• Pre-Charge Current: 100mA
• Termination Current: 10% of the programmed charge current
• Operating Temperature Range: -40°C to +85°C

Detailed Pin Configuration

The BQ24261YFFR has the following pin configuration:

1. VBUS: USB input voltage pin
2. STAT: Status output pin
3. PG: Power good output pin
4. TS: Thermistor input pin
5. SDA: I2C data input/output pin
6. SCL: I2C clock input pin
7. BAT: Battery voltage sense pin
8. SYS: System voltage sense pin
9. ILIM: Charge current limit programming pin
10. GND: Ground pin

Functional Features

1. USB Input: The BQ24261YFFR supports USB input, allowing it to be powered by a standard USB port.
2. I2C Interface: It features an I2C interface for control and monitoring, enabling communication with a microcontroller or host device.
3. Multiple Charging Modes: The IC provides various charging modes, including pre-charge, fast charge, and termination, ensuring efficient and safe charging of Li-Ion batteries.
4. Protection Features: It incorporates protection mechanisms such as overvoltage protection, overcurrent protection, and thermal regulation to safeguard the battery and charger from potential damage.
5. Compact Design: With its small package size and minimal external component requirements, the BQ24261YFFR offers a compact and space-efficient solution for battery charging applications.

Advantages and Disadvantages

Advantages: - Highly integrated design reduces external component count and board space requirements. - Multiple charging modes cater to different battery charging needs. - Protection features ensure safe and reliable charging. - Compact package size enables use in space-constrained applications.

Disadvantages: - Limited to single-cell Li-Ion battery charging applications. - Requires additional circuitry for power input regulation if not using USB.

Working Principles

The BQ24261YFFR operates based on a switching buck-boost converter topology. It regulates the charging current and voltage to ensure optimal charging of the connected Li-Ion battery. The IC monitors the battery voltage, temperature, and charging status to adjust the charging parameters accordingly. It also implements safety measures to prevent overcharging, overcurrent, and overheating.

Detailed Application Field Plans

The BQ24261YFFR is suitable for a wide range of portable electronic devices that utilize single-cell Li-Ion batteries. Some potential application fields include:

1. Smartphones and Tablets: The IC can be used in smartphones and tablets to provide efficient and safe battery charging.
2. Wearable Devices: It is suitable for wearable devices such as smartwatches and fitness trackers, ensuring reliable charging for extended battery life.
3. Portable Medical Devices: The BQ24261YFFR can be employed in portable medical devices like blood glucose monitors and pulse oximeters, enabling convenient and dependable battery charging.
4. Wireless Headsets: It offers a compact solution for charging the batteries of wireless headsets, enhancing user convenience.

Detailed and Complete Alternative Models

1. BQ24260YFFR: Similar to the BQ24261YFFR, but without I2C interface support.
2. BQ24262YFFR: Offers additional features such as USB OTG (On-The-Go) support and adjustable voltage regulation.

These alternative models provide similar functionality with slight variations to cater to different application requirements.

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