TPS54373

www.ti.com Typical Size 6,4 mm X 6,6 mm TPS54373 SLVS455B − JANUARY 2003 − REVISED FEBRUARY 2005 3-V TO 6-V INPUT, 3-A OUTPUT SYNCHRONOUS BUCK SWITCHER WITH DISABLED SINKING DURING START-UP FEATURES D 60-mΩ MOSFET Switches for High Efficiency at 3-A Continuous Output Source or Sink Current D Disabled Current Sinking During Start-Up D Adjustable Output Voltage Down to 0.9 V With 1.0% Accuracy D Wide PWM Frequency: Fixed 350 kHz, 550 kHz or Adjustable 280 kHz to 700 kHz D Synchronizable to 700 kHz D Load Protected by Peak Current Limit and Thermal Shutdown D Integrated Solution Reduces Board Area and Component Count APPLICATIONS D Low-Voltage, High-Density Distributed Power Systems D Point of Load Regulation for High-Performance DSPs, FPGAs, ASICs, and Microprocessors D Broadband, Networking, and Optical Communications Infrastructure D Power PC Series Processors DESCRIPTION As a member of the SWIFT™ family of dc/dc regulators, the TPS54373 low-input voltage, high-output current, synchronous buck PWM converter integrates all required active components. Included on the substrate with the listed features are a true, high-performance, voltage error amplifier that enables maximum performance and flexibility in choosing the output filter L and C components; an undervoltage-lockout circuit to prevent start-up until the input voltage reaches 3 V; an internally or externally set slow-start circuit to limit in-rush currents; and a power-good output useful for processor/logic reset,...