Sparkfun LT3652 Power Tracking 2A Battery Charger (SMD)

The LT3652 is a versatile monolithic step-down battery charger that efficiently operates within a 4.95V to 32V input voltage range. It offers a constant-current/constant-voltage charge characteristic, with a maximum charge current that can be externally programmed up to 2A. With a 3.3V float voltage feedback reference, it allows for programming any desired battery float voltage up to 14.4V using a resistor divider. The charger features an input voltage regulation loop to maintain optimal performance, especially when powered by a solar panel, ensuring the panel operates at peak output power. Additionally, it includes a C/10 termination mode, a low-current standby mode, an auto-recharge feature, and a programmable safety timer for enhanced charging control.

Ideal for renewable energy projects, this charger is particularly effective when paired with solar panels. The input regulation loop is designed to maintain the solar panel at its peak power output, maximizing energy efficiency and ensuring that the battery receives the optimal charge even under varying sunlight conditions. This feature makes it a perfect choice for off-grid solar applications where maintaining consistent power levels is crucial.

The LT3652's programmable safety timer ensures that charging is terminated after a specific time, allowing for top-off charging at currents lower than C/10. This feature is particularly beneficial for extending battery life by preventing overcharging, making it suitable for applications where battery longevity is a priority. Additionally, the auto-recharge function is a significant advantage, as it automatically initiates a new charging cycle if the battery voltage dips 2.5% below the programmed float voltage, ensuring that the battery remains fully charged and ready for use.

Compact and efficient, the LT3652 is designed for ease of integration into various electronic projects. Its ability to handle a wide range of input voltages and programmable features makes it adaptable for diverse applications, from portable electronics to larger energy storage systems. The low standby current of 85µA further enhances its efficiency, making it an excellent choice for energy-conscious designs.