LTC4009IUF-1#TRPBF

Product Overview

Category

The LTC4009IUF-1#TRPBF belongs to the category of integrated circuits (ICs) and specifically falls under the power management ICs.

Use

This product is primarily used for battery charging applications, providing a comprehensive solution for charging single-cell lithium-ion/polymer batteries.

Characteristics

• High Efficiency: The LTC4009IUF-1#TRPBF offers high efficiency charging, ensuring maximum power transfer to the battery.
• Fast Charging: It supports fast charging modes, allowing for quicker battery replenishment.
• Wide Input Voltage Range: The device can operate with input voltages ranging from 4.5V to 28V, making it suitable for various power sources.
• Programmable Charge Current: Users can adjust the charge current according to their requirements.
• Thermal Regulation: The LTC4009IUF-1#TRPBF incorporates thermal regulation to prevent overheating during charging.

Package

This product comes in a small form factor package known as QFN (Quad Flat No-Lead). The specific package variant for LTC4009IUF-1#TRPBF is a 24-pin 4mm x 4mm QFN package.

Essence

The essence of LTC4009IUF-1#TRPBF lies in its ability to efficiently and rapidly charge single-cell lithium-ion/polymer batteries while offering flexibility in terms of input voltage range and charge current adjustment.

Packaging/Quantity

LTC4009IUF-1#TRPBF is typically available in tape and reel packaging, with a quantity of 2500 units per reel.

Specifications

• Input Voltage Range: 4.5V to 28V
• Charge Voltage Range: 3.6V to 4.2V
• Maximum Charge Current: 4A
• Programmable Charge Current Range: 50mA to 4A
• Operating Temperature Range: -40°C to 85°C

Detailed Pin Configuration

The LTC4009IUF-1#TRPBF features a 24-pin QFN package with the following pin configuration:

1. VIN: Input Voltage
2. GND: Ground
3. PROG: Charge Current Programming Pin
4. STAT: Status Indicator Output
5. VBAT: Battery Voltage Sense
6. TS: Thermal Shutdown
7. ISET: Charge Current Set Pin
8. SCL: I2C Serial Clock
9. SDA: I2C Serial Data
10. INTVCC: Internal Regulator Output
11. VCC: Supply Voltage
12. BAT: Battery Connection
13. NTC: Negative Temperature Coefficient Input
14. TIMER: Timer Input
15. ILIM: Input Current Limit
16. VREF: Reference Voltage Output
17. VFB: Feedback Voltage Input
18. VSENSE: Current Sense Input
19. VOUT: Output Voltage
20. SW: Switching Node
21. PGND: Power Ground
22. PGND: Power Ground
23. PGND: Power Ground
24. PGND: Power Ground

Functional Features

• Constant Current/Constant Voltage (CC/CV) Charging: The LTC4009IUF-1#TRPBF employs a CC/CV charging algorithm, ensuring optimal battery charging.
• Automatic Recharge: Once the battery voltage drops below a certain threshold, the device automatically initiates recharge.
• Charge Termination: The charger terminates the charging process when the battery reaches its full capacity, preventing overcharging.
• Safety Features: The LTC4009IUF-1#TRPBF incorporates various safety features like thermal shutdown, input current limit, and overvoltage protection.

Advantages and Disadvantages

Advantages

• High charging efficiency ensures maximum power transfer.
• Fast charging capability reduces charging time.
• Wide input voltage range allows for versatile power source compatibility.
• Programmable charge current provides flexibility.
• Safety features protect the battery and charger from potential risks.

Disadvantages

• Limited to single-cell lithium-ion/polymer battery charging applications.
• Requires additional external components for a complete charging solution.

Working Principles

The LTC4009IUF-1#TRPBF operates based on a CC/CV charging algorithm. Initially, it delivers a constant current to the battery until the battery voltage reaches a predefined threshold. Once reached, the charger switches to a constant voltage mode, maintaining a steady voltage while reducing the charging current. This approach ensures efficient and safe charging of the battery.

Detailed Application Field Plans

The LTC4009IUF-1#TRPBF finds extensive application in various portable electronic devices that utilize single-cell lithium-ion/polymer batteries. Some common application fields include:

1. Smartphones and Tablets: The