The LTC3802EUH is a versatile and powerful step-down DC/DC controller from Linear Technology, designed to deliver high efficiency without the need for a sense resistor (No RSENSE™ technology). This compact, feature-rich controller is ideal for a wide range of applications, including portable devices, telecommunications, and industrial systems, where efficiency and board space are critical considerations.

Key Features

• Wide Input Voltage Range: The LTC3802EUH operates with an input voltage range from 2.75V to 9.8V, making it suitable for single Li-Ion, multi-cell alkaline or NiMH applications, as well as fixed 3.3V or 5V systems.
• High Efficiency: With its No RSENSE™ technology, the LTC3802EUH eliminates the need for a current sense resistor, thereby reducing power loss and improving efficiency.
• Adjustable Frequency: Users can adjust the switching frequency from 300kHz to 750kHz, allowing a trade-off between efficiency and component size.
• Low Dropout Operation: The controller's 100% duty cycle capability provides low dropout operation, which extends the operating time in battery-powered systems when the input voltage drops below the regulated output voltage.

Performance Advantages

The LTC3802EUH is designed for performance. It offers a constant-frequency, current mode architecture that provides excellent line and load transient response. Additionally, the device's low minimum on-time of only 100ns enables it to step down from 9.8V to 0.8V output at high frequency with a small inductor, which is ideal for space-constrained applications.

Protection Features

Safety and reliability are paramount with the LTC3802EUH. It includes a soft-start feature to limit inrush current during startup, overvoltage protection to prevent damage from unexpected surges, and a foldback current limit that reduces the output current to protect the load and the controller during short-circuit conditions.

Package and Availability

The LTC3802EUH is available in a 3mm x 3mm QFN-16 package, which is designed to minimize the footprint on your PCB. This small form factor, combined with the high level of integration, reduces the total solution size, making it an excellent choice for compact, high-performance power systems.