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TPS54673-TPS54673PWPR-TPS54673PWPRG4
Low Input Voltage 6A Continuous Buck Converter with Disabled Sinking During Start Up
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SLVS433A − SEPTEMBER 2002 − REVISED FEBRUARY 2005
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6,4 mm X 9,7 mmTypical Size
FEATURES 30-mΩ, 12-A Peak MOSFET Switches for High
Efficiency at 6-A Continuous Output Source
or Sink Current Disabled Current Sinking During Start-Up 0.9-V to 3.3-V Adjustable Output Voltage
Range 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 and
Thermal Shutdown Integrated Solution Reduces Board Area and
Component Count
APPLICATIONS Low-Voltage, High-Density Distributed Power
Systems Point of Load Regulation for High
Performance DSPs, FPGAs, ASICs and
Microprocessors Broadband, Networking and Optical
Communications Infrastructure Power PC Series Processors
DESCRIPTIONAs a member of the SWIFT family of dc/dc regulators,
the TPS54673 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 enables maximum
performance and flexibility in choosing the output filter
L and C components; an under-voltage-lockout circuit
to prevent start-up until the input voltage reaches 3 V;
an internally or 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 TPS54673 is designed to only source current during
startup.
The TPS54673 is available in a thermally enhanced
28-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.
I/O Supply
* Optional 5.0 ms/div
1 V/div
START UP WAVEFORM
VO = 2.5 V
VI = 3.3 V
RL = 2 Ω
TYPICAL APPLICATION
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