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TPS54980PWPR
Low Input Voltage 9A Tracking Synchronous Buck Converter for Sequencing
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SLVS452A − FEBRUARY 2003 − REVISED FEBRUARY 2005
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6,4 mm X 9,7 mm
Typical Size
FEATURES Power Up/Down Tracking For Sequencing 15-mΩ MOSFET Switches for High Efficiency
at 9-A Continuous Output Source or Sink
Current Wide PWM Frequency:
Fixed 350 kHz or Adjustable 280 kHz to
700 kHz Power Good and Enable 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 Requiring Sequencing Broadband, Networking and Optical
Communications Infrastructure
DESCRIPTIONAs a member of the SWIFT family of dc/dc regulators,
the TPS54980 low-input voltage high-output current
synchronous buck PWM converter integrates all
required active components. Using the TRACKIN pin
with other regulators, simultaneous power up and down
are easily implemented. 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
inrush currents; and a power good output useful for
processor/logic reset.
The TPS54980 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.
SIMPLIFIED SCHEMATIC
Input
500 mv/div
t − Time − 1 ms/div
START-UP WAVEFORM
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