The LTC3405A is a compact, high-efficiency, synchronous step-down DC/DC regulator from Linear Technology, designed to provide a continuous load current of up to 600mA. This versatile regulator is ideal for portable applications due to its low quiescent current and high efficiency across a wide range of load currents.

Key Features

• High Efficiency: Capable of up to 96% efficiency, the LTC3405A ensures minimal power loss and optimal battery life in portable devices.
• Wide Input Voltage Range: With an input voltage range from 2.5V to 5.5V, it is suitable for single-cell Li-Ion batteries as well as other standard power sources.
• Adjustable Output Voltage: The output voltage is adjustable from 0.8V to VIN, making it highly versatile for various applications.
• No Schottky Diode Required: The internal synchronous rectification eliminates the need for an external Schottky diode, reducing both cost and footprint.
• Fast Transient Response: Its high switching frequency (up to 2.25MHz) allows the use of small, low-cost capacitors and inductors, while also providing a fast transient response.
• Low Dropout Operation: The LTC3405A's 100% duty cycle capability provides low dropout operation, which is critical for maximum battery utilization.
• Thermal Protection: Built-in thermal shutdown ensures protection under high-temperature conditions.

Applications

The LTC3405A is suitable for a broad range of applications, particularly where high efficiency, compact size, and ease of use are paramount. These applications include:

• Cellular Telephones
• Personal Digital Assistants (PDAs)
• Digital Cameras
• Portable Media Players
• Wireless and DSL Modems

Package Options and Availability

The LTC3405A is available in a small, low-profile (1mm) 6-lead SOT-23 package, providing a compact solution for space-constrained applications. For purchasing information and availability, please contact Linear Technology or an authorized distributor.