LM5574 Datasheet | National Semiconductor

Description The LM5574 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 - 75V, the LM5574 delivers 0.5A of continuous output current with an integrated 750mΩ 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 lowduty cycles associated with current mode regulators. The operating frequency is adjustable from 50k Hz to 500k Hz 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 LM5574 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 LM5574 is supported by the full suite of WEBENCH® On-Line design tools. Features - - - - - - - - - - Integrated 75V, 750mΩ N-channel MOSFET Ultra-wide input voltage range from 6V to 75V Adjustable output voltage as low as 1.225V 1.5% feedback reference accuracy Operating frequency adjustable between 50k Hz and 500k Hz 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-16 Simplified Application Schematic WEBENCH® is a registered trademark of National Semiconductor Corporation. © 2007 National Semiconductor Corporation .national. Connection Diagram Top View 16-Lead TSSOP Ordering Information Order Number LM5574MT LM5574MTX Package Type TSSOP-16 TSSOP-16 NSC Package Drawing MTC16 MTC16 Supplied As 92 Units in Rail 2500 Units on Tape and Reel .national. Pin Descriptions Pin...