Battery

The LT3651EUHE-8.2 is a versatile multi-chemistry battery charger, specifically optimized for Li-ion and Li-polymer batteries. It is designed to provide a constant charge current up to 2.2 A when used with an external input voltage of up to 5.5V. Because of its simple and efficient design, it is ideal for a wide range of applications.

The LT3651EUHE-8.2 features a fully-integrated continuous current-mode PWM charger that can be configured to operate in either constant-voltage or constant current modes. It also includes a charge control time-out feature that ensures a safe charging process and a thermal burn-out feature to protect from overheating. The device\'s comprehensive input protection and output protection ensure safety in both the charging process and operation.

Working Principle

The LT3651EUHE-8.2 works by using a Pulse Width Modulation (PWM) controller to accurately control the output current and voltage. This is done by continuously varying the period of the charging pulse. The device\'s internal circuitry is able to detect the battery\'s voltage and current levels and adjust its charging current accordingly, ensuring an efficient and safe charging process. When the battery reaches its maximum charging voltage (typically 4.2V for Li-ion/Li-polymer batteries), the charger will automatically switch to a trickle-charging state, supplying only the current to maintain the battery\'s nominal voltage. If a load is present, the charger will also supply the required current for the load.

The LT3651EUHE-8.2 also has an integrated internal protection circuitry to ensure a safe charging process. It monitors the battery voltage, temperature and current levels and will shut down the charging process automatically when any of these parameters exceed their specified limits. The device also has an over-temperature burn-out protection, which will shut down the device if the unit becomes too hot.

Application Field

The LT3651EUHE-8.2 is an ideal lithium-ion/Li-Polymer battery charger, providing optimal charging performance and efficiency. Due to its robust and flexible design, it is suitable for a wide range of applications, including portable and mobile devices, such as cell phones, portable electronic devices, MP3 players, digital cameras, notebook computers, and other handheld devices.

The LT3651EUHE-8.2 is also well-suited for automotive and industrial applications, such as battery management, power supply design, and LED lighting. Additionally, it can be used for energy storage systems, including UPS systems and energy harvesting systems.

Conclusion

The LT3651EUHE-8.2 is a highly intelligent and efficient multi-chemistry battery charger that provides accurate control for Li-Ion and Li-Polymer batteries. It features a full suite of safety features and protection to ensure a safe charging process and an optimal charging current to maximize battery performance. Its compact size and versatility make it ideal for a wide range of applications, including portable and mobile devices, automotive and industrial applications, and energy storage systems.