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TPS54973-TPS54973PWP-TPS54973PWPRG4
Low Input Voltage 9A Synchronous Buck Converter with Disabled Sinking During Start Up
TPS54973
SLVS453A − FEBRUARY 2003 − REVISED FEBRUARY 2005
3-V TO 4-V INPUT, 9-A OUTPUT SYNCHRONOUS BUCK
SWITCHER WITH DISABLED SINKING DURING START-UP
6,4 mm X 9,7 mmTypical Size
FEATURES 15-mΩ MOSFET Switches for High Efficiencyat 9-A Continuous Output Source or SinkCurrent Disabled Current Sinking During Start-Up 0.9-V to 2.5-V Adjustable Output VoltageRange With 1.0% Accuracy Wide PWM Frequency: Fixed 350 kHz, 550 kHz or Adjustable 280 kHz to 700 kHz Synchronizable to 700 kHz Load Protected by Peak Current Limit andThermal Shutdown Integrated Solution Reduces Board Area andComponent Count
APPLICATIONS Low-Voltage, High-Density Distributed PowerSystems Point of Load Regulation for High Performance DSPs, FPGAs, ASICs andMicroprocessors Broadband, Networking and OpticalCommunications Infrastructure Power PC Series Processors
DESCRIPTIONAs a member of the SWIFT™ family of dc/dc regulators,the TPS54973 low-input voltage high-output currentsynchronous buck PWM converter integrates allrequired active components. Included on the substratewith the listed features are a true, high performance,voltage error amplifier that enables maximumperformance and flexibility in choosing the output filterL and C components; an undervoltage-lockout circuit toprevent start-up until the input voltage reaches 3 V; aninternally or externally set slow-start circuit to limitin-rush currents; and a power good output useful forprocessor/logic reset, fault signaling, and supplysequencing.
For reliable power up in output precharge applications,the TPS54973 is designed to only source current duringstartup.
The TPS54973 is available in a thermally enhanced28-pin TSSOP (PWP) PowerPAD™ package, whicheliminates bulky heatsinks. TI provides evaluationmodules and the SWIFT™ designer software tool to aidin quickly achieving high-performance power supplydesigns to meet aggressive equipment developmentcycles.
I/O Supply
* Optional
TYPICAL APPLICATION
1 V/div
t − Time − 10 ms/div
START-UP WAVEFORM
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