LT3651EUHE-8.2

Product Overview

Category

LT3651EUHE-8.2 belongs to the category of integrated circuits (ICs) specifically designed for battery charging applications.

Use

This product is primarily used for charging single-cell lithium-ion/polymer batteries in various portable electronic devices such as smartphones, tablets, and digital cameras.

Characteristics

• Input Voltage Range: 4V to 32V
• Output Voltage: 8.2V
• Charging Current: Up to 2A
• Efficiency: Up to 94%
• Package Type: 16-Lead 3mm × 3mm QFN

Package and Quantity

The LT3651EUHE-8.2 is available in a 16-Lead 3mm × 3mm QFN package. It is typically sold in reels or tubes containing a specific quantity of units, depending on the manufacturer's packaging specifications.

Specifications

• Input Voltage Range: 4V to 32V
• Charge Voltage: 8.2V ± 0.5%
• Maximum Charging Current: 2A
• Operating Temperature Range: -40°C to 85°C
• Shutdown Current: <1µA
• Battery Float Voltage: 4.2V ± 0.5%
• Battery Discharge Voltage: 2.9V
• Battery Recharge Voltage: 3.9V
• Battery Overvoltage Protection: 4.35V

Pin Configuration

The LT3651EUHE-8.2 has a 16-lead QFN package with the following pin configuration:

1. VIN: Input voltage pin
2. GND: Ground pin
3. PGND: Power ground pin
4. VFB: Feedback voltage pin
5. ISET: Charging current set pin
6. STAT: Status pin
7. EN/UVLO: Enable/Undervoltage lockout pin
8. TS: Temperature sense pin
9. VCC: Supply voltage pin
10. BAT: Battery connection pin
11. PROG: Programming pin
12. ILIM: Current limit pin
13. SS: Soft-start pin
14. FB: Feedback pin
15. SW: Switching node pin
16. PGND: Power ground pin

Functional Features

• Wide input voltage range allows for versatile applications.
• Integrated power switches and current sensing enable a compact design.
• Programmable charging current through the ISET pin.
• Automatic recharge feature protects the battery from deep discharge.
• Thermal regulation and protection ensure safe operation.

Advantages and Disadvantages

Advantages

• High efficiency charging with up to 94% conversion efficiency.
• Compact package size enables space-saving designs.
• Wide input voltage range provides flexibility in power sources.
• Comprehensive protection features safeguard the battery and circuitry.

Disadvantages

• Limited to single-cell lithium-ion/polymer battery charging applications.
• Requires external components for complete charging system implementation.

Working Principles

The LT3651EUHE-8.2 is a constant-current/constant-voltage (CC/CV) charger IC. It utilizes a switching regulator topology to efficiently charge lithium-ion/polymer batteries. The IC regulates the charging current and voltage according to the battery's state of charge, ensuring safe and optimal charging.

Detailed Application Field Plans

The LT3651EUHE-8.2 is widely used in various portable electronic devices that require single-cell lithium-ion/polymer battery charging. Some common application fields include:

1. Smartphones and tablets
2. Digital cameras and camcorders
3. Portable gaming devices
4. Portable medical devices
5. Wireless communication devices

Detailed and Complete Alternative Models

1. LT3651EUHE-4.2: Similar to LT3651EUHE-8.2 but designed for charging 4.2V lithium-ion/polymer batteries.
2. LT3651EUHE-5.0: Similar to LT3651EUHE-8.2 but designed for charging 5.0V lithium-ion/polymer batteries.
3. LT3651EUHE-12.6: Similar to LT3651EUHE-8.2 but designed for charging 12.6V lithium-ion/polymer batteries.

These alternative models provide similar functionality but cater to different battery voltage requirements.

In conclusion, the LT3651EUHE-8.2 is a versatile IC designed for efficient and safe charging of single-cell lithium-ion/polymer batteries. Its wide input voltage range, compact package size, and comprehensive protection features make it suitable for various portable electronic devices.