LT3684EMSE/LT3684IMSE - Step-Down Switching Regulator from Linear Technology

The LT3684EMSE and LT3684IMSE are high-performance, adjustable frequency, monolithic step-down switching regulators designed by Linear Technology. These regulators are ideal for a variety of applications, including automotive, industrial, and distributed power systems. They are capable of delivering up to 3.5A of continuous output current with a wide input voltage range from 3.6V to 36V, making them suitable for regulating power from a wide array of sources, including unregulated wall adapters, 12V and 24V lead-acid batteries, and industrial supplies.

The LT3684 series features a high efficiency design, which can be optimized with the user-selectable switch frequency from 300kHz to 2.2MHz, allowing for a compact footprint when using smaller inductors and capacitors. This flexibility is highly beneficial for designers looking to optimize board space and component cost.

Both the LT3684EMSE and LT3684IMSE incorporate internal 4.6A switches, which provide a low V<sub>CESAT at high currents, thereby reducing power loss and improving efficiency. Additionally, the regulators offer a Burst Mode® operation, which is particularly useful for reducing quiescent current and maintaining high efficiency at low output currents, thus extending battery life in portable applications.

Key features of the LT3684EMSE/LT3684IMSE include:

• Wide input voltage range: 3.6V to 36V
• Adjustable frequency from 300kHz to 2.2MHz
• Up to 3.5A of continuous output current
• Low dropout operation: 100% duty cycle
• Internal 4.6A switch
• Burst Mode® operation for high efficiency at low output currents
• Thermal shutdown and cycle-by-cycle current limit
• Robust MSOP-16E package

The LT3684EMSE and LT3684IMSE are differentiated by their operating temperature ranges. The LT3684EMSE is designed for commercial and industrial temperatures ranging from -40°C to 125°C, while the LT3684IMSE is specified for the industrial temperature range of -40°C to 85°C.

Overall, the LT3684EMSE/LT3684IMSE regulators from Linear Technology provide a versatile and efficient power management solution, ensuring stable operation and a reliable power supply for a wide range of electronic devices.