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TPS54373TIN/a740avaiLow Input Voltage 3A Synchronous Buck Converter with Disabled Sinking During Start Up
TPS54373PWPTIN/a569avaiLow Input Voltage 3A Synchronous Buck Converter with Disabled Sinking During Start Up
TPS54373PWPRTIN/a8000avaiLow Input Voltage 3A Synchronous Buck Converter with Disabled Sinking During Start Up


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TPS54373-TPS54373PWP-TPS54373PWPR
Low Input Voltage 3A Synchronous Buck Converter with Disabled Sinking During Start Up
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
6,4 mm X 6,6 mmTypical Size

FEATURES
60-mΩ MOSFET Switches for High Efficiencyat 3-A Continuous Output Source or SinkCurrent Disabled Current Sinking During Start-Up Adjustable Output Voltage Down to 0.9 VWith 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
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 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 TPS54373 is designed to only source current duringstart-up.
The TPS54373 is available in a thermally enhanced20-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
START-UP WAVEFORMTYPICAL APPLICATION
5.0 ms/div
1 V/div
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