LTC3890IGN-3#PBF

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The LTC3890IGN-3#PBF is a current mode DC/DC controller with powertrain sensing circuitry and integrated high-side and low-side MOSFET drivers for DC/DC converters. This device is well-suited to apply various standard topologies such as flyback, forward, inverting, and SEPIC in both single output and multiple output configurations. The powertrain sensing includes output current, input voltage, temperature feedback, and self-protection.

The LTC3890IGN-3#PBF offers various key features such as a large and wide-ranging operating temperature range, a duty limit circuit, a valley fill circuit, a light load feature, a spread spectrum function, a power good output, integrated frequency synchronization, and a soft start circuit. This product is ideal for use in applications such as HVAC controllers, LED lighting, hand-held/desktop wireless/wired switching power supplies, battery powered equipment and home appliances.

The operating temperature range of the LTC3890IGN-3#PBF is extended to -40℃ to 150℃, making it suitable for use in a variety of harsh industrial, automotive, and military/aerospace applications. The valley fill feature and duty limit circuit allow for improved power efficiency and EMI, respectively. The spread spectrum function and the frequency synchronization facilitate EMI containment and complete system level optimization.

The LTC3890IGN-3#PBF is compact and energy efficient, which reduces heat generation and system costs. The light load feature ensures that the output power is substantially reduced when the load is light and thus provides savings in energy consumption. This product is compliant to the ROHS 2.0 directive and is lead-free, making it safe for environment.

This product works on the principle of combining an integrated powertrain sensing, adaptive slope compensation and an adjustable peak current sensing loop. The powertrain sensing enables the product to monitor the output current and the input voltage and provides an internal temperature feedback of the powerstage to prevent overloading and overheating in operations. The adaptive slope compensation minimizes the peak value of the input current when the powertrain is lightly loaded and thus optimizes the power efficiency of the system. The adjustable peak current sensing loop regulates the peak current level, ensuring the best efficiency and safety against potential short-circuit while switching in the primary side MOSFET.

With its wide operating temperature range, various protection functions, frequency synchronization, spread spectrum function, light load feature, and other safety features, the LTC3890IGN-3#PBF enables system designers to reduce the size, cost and complexity of the power supply designs for multiple application fields.

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