BQ25121AYFPT

Product Overview

Category

BQ25121AYFPT belongs to the category of integrated circuits (ICs) and specifically falls under power management ICs.

Use

This product is primarily used for power management in various electronic devices, such as smartphones, tablets, portable media players, and other battery-powered devices.

Characteristics

• Low power consumption: The BQ25121AYFPT is designed to minimize power consumption, making it suitable for energy-efficient applications.
• Compact size: This IC comes in a small package, allowing for space-saving integration into electronic devices.
• High efficiency: The BQ25121AYFPT offers high conversion efficiency, ensuring optimal power utilization.
• Wide input voltage range: It can handle a wide range of input voltages, making it versatile for different power sources.
• Integrated protection features: This IC incorporates various protection mechanisms, including overvoltage protection, overcurrent protection, and thermal shutdown.

Package and Quantity

The BQ25121AYFPT is available in a compact 20-pin QFN (Quad Flat No-Lead) package. It is typically sold in reels containing a specific quantity, usually 250 or 300 units per reel.

Specifications

• Input Voltage Range: 2.5V - 5.5V
• Output Voltage Range: 1.8V - 4.2V
• Maximum Output Current: 500mA
• Operating Temperature Range: -40°C to +85°C
• Quiescent Current: 10µA (typical)
• Efficiency: Up to 95%
• Protection Features: Overvoltage, Overcurrent, Thermal Shutdown

Pin Configuration

The BQ25121AYFPT has a total of 20 pins, each serving a specific function. Here is a detailed pin configuration:

1. VIN: Input voltage pin
2. GND: Ground pin
3. VBAT: Battery voltage input
4. SYS: System voltage output
5. EN: Enable pin
6. PG: Power good indicator
7. STAT: Status indicator
8. INT: Interrupt pin
9. ISET: Current limit setting
10. TS: Thermal shutdown pin
11. BATFET: Battery FET control
12. LDO: Low-dropout regulator output
13. VOUT: Output voltage pin
14. BST: Boost converter input
15. SW: Switching node
16. FB: Feedback pin
17. COMP: Compensation pin
18. SS: Soft-start pin
19. AGND: Analog ground
20. NC: No connection

Functional Features

The BQ25121AYFPT offers several functional features that enhance its performance and usability:

1. Integrated Battery Charger: This IC includes a built-in battery charger, allowing for convenient charging of the connected battery.
2. Power Path Management: It enables simultaneous power delivery to the system load and battery charging, ensuring uninterrupted operation.
3. Dynamic Voltage Scaling: The BQ25121AYFPT supports dynamic voltage scaling, enabling efficient power management based on the system's requirements.
4. Programmable Current Limit: The current limit can be adjusted using the ISET pin, providing flexibility in managing power consumption.
5. Fault Detection and Protection: The IC incorporates various protection mechanisms to safeguard against overvoltage, overcurrent, and thermal issues.

Advantages and Disadvantages

Advantages

• High efficiency and low power consumption contribute to extended battery life.
• Compact size allows for easy integration into space-constrained devices.
• Wide input voltage range provides compatibility with different power sources.
• Integrated protection features ensure device safety and reliability.
• Built-in battery charger eliminates the need for external charging circuitry.

Disadvantages

• Limited maximum output current may not be suitable for high-power applications.
• The 20-pin package may require specialized assembly techniques for certain manufacturing processes.

Working Principles

The BQ25121AYFPT operates based on a combination of boost converter and linear regulator technologies. It takes the input voltage from the power source, boosts it to a higher voltage level using the boost converter, and then regulates it to the desired output voltage using the linear regulator. The integrated battery charger manages the charging process while ensuring optimal battery performance and safety.

Application Field Plans

The BQ25121AYFPT finds application in various fields, including but not limited to:

1. Mobile Devices: Smartphones, tablets, and wearable devices can benefit from its power management capabilities.
2. Portable Media Players: MP3 players, portable gaming consoles, and other media devices can optimize their battery usage with this IC.
3. IoT Devices: Battery-powered Internet of Things (IoT) devices, such as sensors and wireless modules, can efficiently manage their power requirements.
4. Medical Devices: Portable medical equipment, like glucose meters and blood