LM25576 Datasheet | National Semiconductor

Description The LM25576 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 ponents. Operating with an input voltage range of 6 - 42V, the LM25576 delivers 3A of continuous output current with an integrated 170mΩ N-Channel MOSFET. The regulator utilizes an Emulated Current Mode architecture which provides inherent line regulation, tight load transient response, and ease of loop pensation without the usual limitation of low-duty cycles associated with current mode regulators. The operating frequency is adjustable from 50k Hz to 1MHz to allow optimization of size and efficiency. To reduce EMI, a frequency synchronization pin allows multiple IC’s from the LM(2)557x family to self-synchronize or to synchronize to an external clock. The LM25576 guarantees robustness with cycle-by-cycle current limit, short-circuit protection, thermal shut-down, and remote shut-down. The device is available in a power enhanced TSSOP-20 package featuring an exposed die attach pad for thermal dissipation. The LM25576 is supported by the full suite of WEBENCH® On-Line design tools. Features - - - - - - - - - - Integrated 42V, 170mΩ 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 50k Hz 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 Package - TSSOP-20EP (Exposed Pad) Simplified Application Schematic WEBENCH® is a registered trademark of National Semiconductor Corporation. © 2007 National Semiconductor Corporation .national. Connection Diagram Top View 20-Lead TSSOP Ordering Information Order Number LM25576MH LM25576MHX Package Type Exposed Pad TSSOP-20 Exposed Pad TSSOP-20 NSC Package...