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TPS54873TIN/a720avai5V Input 8A Continuous Buck Converter with Disabled Sinking During Start Up
TPS54873PWPRTIN/a226avai5V Input 8A Synchronous Buck Converter with Disabled Sinking During Start Up


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TPS54873-TPS54873PWPR
5V Input 8A Continuous Buck Converter with Disabled Sinking During Start Up
TPS54873
SLVS444A − OCTOBER 2002 − REVISED FEBRUARY 2005
4-V TO 6-V INPUT, 8-A OUTPUT SYNCHRONOUS BUCK
SWITCHER WITH DISABLED SINKING DURING START-UP
6,4 mm X 9,7 mmTypical Size

FEATURES
30-mΩ, 12-A Peak MOSFET Switches for HighEfficiency at 8-A Continuous Output Sourceor Sink Current Disabled Current Sinking During Start-Up 0.9-V to 3.3-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
DESCRIPTION

As a member of the SWIFT™ family of dc/dc regulators,the TPS54873 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 under-voltage-lockout circuitto prevent start-up until the input voltage reaches 4 V;an internally or externally set slow-start circuit to limitinrush currents; and a power good output useful forprocessor/logic reset, fault signaling, and supplysequencing.
For reliable power up in output precharge applications,the TPS54873 is designed to only source current duringstartup.
The TPS54873 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.
TYPICAL APPLICATION
I/O Supply
* Optional 5.0 ms/div
1 V/div
START-UP WAVEFORM
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