LM5574MTX/NOPB – TEXAS INSTRUMENTS

The LM5574MTX/NOPB is a monolithic, synchronous step-down converter from Texas Instruments, optimized for high-efficiency power conversion in space-constrained applications. This specific part number denotes a thermally enhanced, 28-pin, 4x4mm QFN package (NOPB) with exposed thermal pad. It operates from a 4.5V to 18V input voltage range and delivers a precisely regulated output current up to 4A. The device features internal compensation, enabling simplified design without external components for most applications. Its switching frequency is programmable from 300kHz to 1.5MHz, allowing designers to optimize for efficiency and EMI considerations._x000D_
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The LM5574MTX/NOPB utilizes a synchronous rectification architecture, minimizing conduction losses and maximizing efficiency, typically exceeding 90% at nominal load. Key features include adjustable output voltage via a single resistor, soft-start functionality to limit inrush current, and overcurrent/overtemperature protection for robust operation. Common applications include powering portable devices, industrial control systems, and automotive electronics where high efficiency and compact size are paramount. Its high switching frequency allows for smaller external components compared to lower frequency alternatives, making it ideal for space-constrained designs requiring high power density.