FEATURES

15-mΩ MOSFET Switches for High Efficiency

at 9-A Continuous Output Source or Sink

Current

Disabled Current Sinking During Start-Up

0.9-V to 2.5-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

DESCRIPTION

As a member of the SWIFT™ family of dc/dc regulators,

the TPS54973 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 undervoltage-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 TPS54973 is designed to only source current during

startup.

The TPS54973 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.