40-A DC-DC with Differential Remote Voltage Sensing

Texas Instruments (TI) has introduced a 40-A, 16-V(in) synchronous step-down dc-dc converter with true differential remote-voltage sensing. The SWIFT TPS548D22 buck converter features a small PowerStack™ package and integrated MOSFETs to drive application-specific integrated circuits (ASICs) and digital signal processors (DSPs) in space-constrained applications.

The TPS548D22 dc-dc converter employs the D-CAP3â„¢ control-mode topology, features 0.5 percent reference-voltage accuracy over temperature, and includes true differential remote-voltage sensing to meet voltage requirements of deep submicron processors.

TPS548D22 key features and benefits include: Integrated 2.9/1.2 milli-ohm high-/low-side RDS(on) power MOSFETs increase power density and system reliability. True differential remote-voltage sensing improves load regulation for overall system accuracy. The easy to use D-CAP3 adaptive on-time control mode provides high accuracy and very fast load-transient response and requires no loop compensation, which simplifies design and minimizes external component count.

PowerStack quad flat no-lead (QFN) packaging offers high power density and allows easy heat sinking from the single ground pad on the bottom of the integrated circuit (IC) into the internal printed circuit board ground layers with very few vias. Other features that help ensure predictable and reliable operation include internal soft start, input undervoltage protection and thermal shutdown.

The TPS548D22 is the first in a family of 40-A converters to join TI's high-current dc-dc SWIFT product portfolio. Available in volume now from TI and its authorized distributors, the TPS548D22 is packaged in a 40-pin, 5-mm by 7-mm by 1.5-mm PowerStack QFN package and priced at US$4.19 in 1,000-unit quantities.