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TPS54310PWP.pdf

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TPS54310PWP

TPS54310 SLVS412A – DECEMBER 2001 – REVISED JUNE 2002 3-V TO 6-V INPUT, 3-A OUTPUT SYNCHRONOUS-BUCK PWM SWITCHER WITH INTEGRATED FETs (SWIFT?) (6,3 mm x 6,4 mm) Typical Size FEATURES 60-m? MOSFET Switches for High Efficiency at 3-A Continuous Output Source or Sink Current 0.9-V to 3.3-V Adjustable Output Voltage With 1% Accuracy Externally Compensated for Design Flexibility Fast Transient Response Wide PWM Frequency: Fixed 350 kHz, 550 kHz, or Adjustable 280 kHz to 700 kHz Load Protected by Peak Current Limit and Thermal Shutdown Integrated Solution Reduces Board Area and Total Cost 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 Communications Infrastructure Portable Computing/Notebook PCs DESCRIPTION As members of the SWIFT family of dc/dc regulators, the TPS54310 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 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. The TPS54310 device is available in a thermally enhanced 20-pin TSSOP (PWP) PowerPAD? package, which eliminates bulky heatsinks. TI provides evaluation modules and the SWIFT designer software tool to aid in quickly achieving high-performance power supply designs to meet aggressive equipment development cycles. VIN PH TPS54310 BOOT PGND COMP VSENSE AGND VBIAS Compensation Network Input Output Simplified Schematic 80 82 84 86 88 90 92 94 96 0 0.5 1 1.5 2 2.5 3 Load Current – A E f f ic ie n c y