Linear Technology LTC3809EMSE - High Efficiency, No RSENSE™ Step-Down DC/DC Controller

The LTC3809EMSE from Linear Technology is a high-performance step-down switching regulator DC/DC controller that drives an all N-channel synchronous power MOSFET stage. This advanced controller is designed for power supply designers who require a low component count, high efficiency, and excellent thermal performance.

Key Features:

• No RSENSE™ Technology: The LTC3809EMSE utilizes Linear Technology's proprietary No RSENSE technology, which eliminates the need for a sense resistor, thereby improving efficiency and reducing system cost and complexity.
• Wide Input Voltage Range: With an operating input voltage from 2.75V to 9.8V, this controller is versatile enough to be used in a variety of applications, from portable devices to distributed power systems.
• Constant Frequency Operation: The fixed frequency, current mode architecture ensures stable operation over a wide range of supply and output voltages, and provides fast transient response and excellent loop stability.
• Low Dropout Operation: The LTC3809EMSE maintains output regulation during a low input voltage condition by enhancing the duty cycle, which makes it ideal for applications subject to significant input voltage variation.
• Adjustable Operating Frequency: The switching frequency is user-programmable from 300kHz to 4MHz, allowing the use of small, low-cost inductors and capacitors to achieve a very compact and responsive design.
• High Efficiency: Its high efficiency is achieved through the use of low RDS(ON) internal switches and synchronous operation, which reduces power losses.
• Robust Protection Features: The LTC3809EMSE includes features such as overvoltage protection, undervoltage lockout, and thermal shutdown, ensuring reliable operation under adverse conditions.

Applications:

The LTC3809EMSE is suitable for a wide range of applications, including:

• Telecommunications and Networking Equipment
• Portable Electronic Devices
• Distributed Power Systems
• Industrial Equipment
• Automotive Power Systems

With its compact MSOP-10 package, the LTC3809EMSE is an excellent choice for applications where space is at a premium, and performance cannot be compromised.