1 Features

• 13-mΩ MOSFET Switches for High Efficiency at 9-A Continuous Output
• Adjustable Output Voltage Down to 0.9 V With
  1% Accuracy
• Externally Compensated for Design Flexibility
• Wide PWM Frequency: Fixed 350 kHz, 550 kHz, or Adjustable 280 kHz to 1.6 MHz
• Synchronizable to 1.6 MHz
• Load Protected by Peak Current Limit and Thermal Shutdown
• Small 3.5 mm x 7 mm Package and Similar Layout to TPS54910 Reduces Board Area and Total Cost
• SWIFT Documentation Application Notes, and SwitcherPro™ Software: www.ti.com/swift

2 Applications

• Low-Voltage, High-Density Systems With Power Distributed at 3.3 V
• Point-of-Load Regulation for High Performance DSPs, FPGAs, ASICs, and Microprocessors
• Broadband, Networking, and Optical Communications Infrastructure

3 Description

As a member of the SWIFT™ family of DC-DC regulators, the TPS54917 low-input voltage high-output current synchronous buck PWM converter offers the same features as the TPS54910 in a smaller package and higher switching frequency, which allows for a smaller total solution. Included on the substrate with the listed features are a true, high performance, voltage error amplifier that enables maximum performance under transient conditions and flexibility in choosing the output filter L and C components; an undervoltage lockout (UVLO) circuit to prevent start-up until the input voltage reaches 3 V; an internally and externally set slow-start circuit to limit in-rush currents; and a power good output useful for processor or logic reset, fault signaling, and supply sequencing.

The TPS54917 is available in a thermally enhanced 34-pin VQFN (RUV) PowerPAD™ package, which eliminates bulky heat sinks. TI provides evaluation modules and the SwitcherPro design software tool to aid in achieving high-performance power supply designs to meet aggressive equipment development cycles.

1. For all available packages, see the orderable addendum at the end of the data sheet.

Simplified Schematic

Efficiency at 700 kHz