Maximize Power Density With Highest Efficiency 40A DC/DC Buck Converter

  • High voltage accuracy & shrinks overall PCB size
  • Delivers up to 160A output current through its stack connection

Texas Instruments (TI) has introduced a new SWIFT 40-A DC/DC buck converter that supports stackable configuration to achieve higher current output. The TPS546D24A PMBus buck converter can deliver up to 160A at 85°C ambient temperature when four TPS546D24A are interconnected.

The TPS546D24A has a high efficiency which allows engineers to reduce the power loss by 1.5 W in a high-performance data centre and enterprise computing, medical, wireless infrastructure, and wired networking applications. 

Shrink the power supply solution size

The unique stackability feature of TPS546D24A buck converter provides both small solution size & good thermal performance. It comes with a PMBus interface that offers a selectable internal compensation network which helps engineers to eliminate up to six external compensation components from the board. and shrink the overall power-supply solution size by more than 10% (or 130 mm2) for higher-current FPGA/ASICs when compared to discrete multiphase controllers.

Boost efficiency at high switching frequencies


The TPS546D24A offers a switching frequency of 1.5 MHz and allows engineers to deliver 40 A of current per IC while reducing inductance and capacitance. It features a 0.9-mΩ low-side MOSFET which helps in achieving greater efficiency at higher switching frequencies. 

Meet high voltage tolerance requirements

The power supplies designed for FPGAs require high voltage accuracy to support FPGA DC rails. This IC has an output voltage error of less than 1% which helps in achieving voltage tolerance requirements. Furthermore, its extensive PMBus command set and pin-strapping configurability will help to monitor current more accurately for fault reporting and to avoid overdesign. 

Availability and pricing

The TPS546D24A is now available in a 5-mm-by-7-mm, 40-pin quad flat no-lead (QFN) package. The pricing starts at US$4.27 in 1,000-unit quantities and it’s available from TI and authorised distributors. The TPS546D24AEVM evaluation module is available on for US$199.

Pin-to-pin and footprint compatible, preproduction TPS546B24A (20-A) and TPS546A24A (10-A) DC/DC converters are also available & the pricing starts at US$3.25 and US$2.49 in 1,000-unit quantities, respectively.

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