TPS54377 Datasheet | Texas Instruments

FEATURES - 2 60-mΩ MOSFET Switches for High Efficiency at 3-A Continuous Output Current - Adjustable Output Voltage Down to 0.9 V With 1% Accuracy - Switching Frequency: Adjustable From 280 k Hz to 1600 k Hz - Disabled Current Sinking During Start-Up - Fast Transient Response - Load Protected by Peak Current Limit and Thermal Shutdown - Integrated Solution Reduces Board Area and Total Cost - Spacing Saving 4mm x 5mm QFN Packaging - For SWIFT Documentation, Application Notes, and Design Software, see the TI website at .ti./swift APPLICATIONS - Low-Voltage, High-Density Systems With Power Distributed at 5 V or 3.3 V - Point of Load Regulation for High Performance DSPs, FPGAs, ASICs, and Microprocessors - Broadband, Networking and Optical munications Infrastructure DESCRIPTION As a member of the SWIFT™ family of dc/dc regulators, the TPS54377 low-input-voltage high-output-current synchronous-buck PWM converter integrates all required active ponents. Included on the substrate with the listed features are a true, high performance, voltage error amplifier that provides high performance under transient conditions; an undervoltage-lockout circuit to prevent start-up until the input voltage reaches 3 V; an internally and externally set slow-start circuit to limit in-rush currents; and a power good output useful for processor/logic reset, fault signaling, and supply sequencing. For reliable power up in output precharge applications, the TPS54377 is designed to only source current during start-up. The TPS54377 device is available in a thermally enhanced 24-pin QFN (RHF) Power PAD™ package, which eliminates bulky heatsinks. TI provides evaluation modules and the SWIFT designer software tool to aid in achieving high-performance power supply designs to meet aggressive equipment development cycles. Simplified Schematic - - START-UP WAVEFORM Input PWRGD SS/ENA BOOT SYNC PGND VBIAS VSENSE AGND P Output 1 V/div RL = 1 Ω VI = 3.3 V VO = 1.8 V -...