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SIMPLE SWITCHER? 42V, 0.5A Step-Down Switching Regulator from the PowerWise? Family
National Semiconductor

The LM25574 is an easy to use SIMPLE SWITCHER? buck regulator which allows design engineers to design and optimize a robust power supply using a minimum set of components. Operating with an input voltage range of 6 - 42V, the LM25574 delivers 0.5A of continuous output current with an integrated 750m? N-Channel MOSFET. The regulator utilizes an Emulated Current Mode architecture which provides inherent line regulation, tight load transient response, and ease of loop compensation without the usual limitation of low-duty cycles associated with current mode regulators. The operating frequency is adjustable from 50kHz to 1MHz to allow optimization of size and efficiency. To reduce EMI, a frequency synchronization pin allows multiple ICs from the LM(2)557x family to self-synchronize or to synchronize to an external clock. The LM25574 guarantees robustness with cycle-by-cycle current limit, short-circuit protection, thermal shut-down, and remote shut-down. The device is available in a TSSOP-16 package. The LM25574 is supported by the full suite of WEBENCH On-Line design tools.

??? Integrated 42V, 750m? N-channel MOSFET
??? Ultra-wide input voltage range from 6V to 42V
??? Adjustable output voltage as low as 1.225V
??? 1.5% feedback reference accuracy
??? Operating frequency adjustable between 50kHz and 1MHz with single resistor
??? Master or slave frequency synchronization
??? Adjustable soft-start
??? Emulated current mode control architecture
??? Wide bandwidth error amplifier
??? Built-in protection

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