Texas Instruments Introduces Stackable 40-A SWIFT DC/DC Buck Converter

Texas Instruments DC

Texas Instruments has introduced a new 40-A SWIFT DC/DC buck converter, offering stackability of up to four integrated circuits (ICs). The TPS546D24A is a 40-A DC/DC converter offering high efficiency, which would allow engineers to reduce power loss by 1.5 W in high-performance data center and enterprise computing, medical, wireless infrastructure, and wired networking applications. 

Solution size and thermal performance are two key considerations for engineers designing power supplies for modern field-programmable gate arrays (FPGAs). With its unique stackability, the TPS546D24A buck converter addresses both.

The TPS546D24A comes with a PMBus interface that offers a selectable internal compensation network, enabling engineers to eliminate as many as six external compensation components from the board and shrink the overall power-supply solution size significantly.

In addition, the TPS546D24A would achieve a low thermal resistance of 8.1°C per watt and run significantly cooler than many other DC/DC converters on the market, improving reliability in electronics that operate in hot, harsh environments, such as baseband units and automated test equipment.

Efficiency at High Switching Frequencies

Using DC/DC converters with high switching frequencies allows engineers to shrink the footprint of the power supply and facilitates the design of high-bandwidth systems. The TPS546D24A would offer a switching frequency of 1.5 MHz, enabling engineers to deliver 40 A of current per IC while reducing inductance and capacitance by one-third compared to similar converters. To mitigate the negative impact on efficiency, which is typically associated with high switching frequencies, the TPS546D24A features a 0.9-mΩ low-side MOSFET.

Meet rigorous voltage accuracy requirements for FPGA power supplies

FPGAs are used in a variety of applications, but engineers designing power supplies for FPGAs are often surprised by the voltage accuracy required to support FPGA DC rails, sated Texas Instruments. The TPS546D24A would make it easier for engineers to meet these rigorous voltage tolerance requirements by offering an output voltage error “of less than 1%.”

Furthermore, its extensive PMBus command set and pin-strapping configurability would allow engineers to monitor current more accurately for fault reporting and to avoid overdesign.

The TPS546D24A is now available from Texas Instruments and authorized distributors in a 5-mm-by-7-mm, 40-pin quad flat no-lead (QFN) package.

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