The LTC3809EDD-1#PBF is a high-performance step-down DC/DC controller from Linear Technology that is designed to deliver low electromagnetic interference (EMI) and efficient power conversion without the need for a sense resistor (No RSENSE). This product is part of the LTC3809 series, which is known for its compact and versatile controllers suitable for a wide range of power supply applications.

Key Features

• No RSENSE Feature: The LTC3809EDD-1#PBF eliminates the need for a sense resistor, which simplifies the design and reduces power loss, enhancing system efficiency.
• Low EMI Operation: With its controlled switching edges and an internal phase-locked loop (PLL), this controller minimizes EMI, which is crucial for applications sensitive to noise.
• Wide Input Voltage Range: It operates over a wide input voltage range of 4V to 38V, making it suitable for a variety of input sources, including automotive batteries and industrial supplies.
• Adjustable Switching Frequency: The switching frequency is programmable from 300kHz to 750kHz, allowing designers to optimize the size of the external components and the performance of the power supply.
• High Efficiency: The LTC3809EDD-1#PBF offers high efficiency due to its low quiescent current and the use of MOSFETs as the external power switch.
• Thermal Protection: It includes an over-temperature protection feature that safeguards the controller under high-temperature operating conditions.

Applications

The versatility of the LTC3809EDD-1#PBF makes it suitable for a wide range of applications, including:

• Telecommunications
• Automotive systems
• Industrial power supplies
• Datacom and Networking
• Battery-powered devices

Package and Availability

The LTC3809EDD-1#PBF is offered in a compact (3mm x 3mm) DFN-10 package, which is ideal for space-constrained applications. Its performance and small footprint make it an excellent choice for designers seeking a robust power management solution.