40-A, 16-VIN buck converter has true differential remote-voltage sensing

June 02, 2016 // By Graham Prophet
Texas Instruments claims the first 40-A, 16-VIN synchronous step-down DC/DC converter with true differential remote-voltage sensing; its SWIFT TPS548D22 buck converter features a small PowerStack package and integrated MOSFETs to power ASICs and processors in space-constrained applications.

TI’s WEBENCH Power Designer tool aids in power-dense wired and wireless communications; enterprise and cloud computing; and data-storage systems designs. The TPS548D22 DC/DC converter employs the D-CAP3 control-mode topology, features 0.5% reference-voltage accuracy over temperature, and includes true differential remote-voltage sensing to meet voltage requirements of deep submicron processors.


Integrated 2.9/1.2 mOhm high-/low-side R DS(ON) power MOSFETs increase power density and system reliability; true differential remote-voltage sensing improves load regulation for overall system accuracy; and the D-CAP3 (application note here) 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 very high power density and simplifies heat sinking from the single ground pad on the bottom of the 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. In a 40-pin, 5 by 7 by 1.5-mm PowerStack QFN package it is priced at $4.19 (1,000)-unit quantities. It is supported with the TPS548D22EVM-784 evaluation module .


Resources include a blog post, “Using converters in high-current, point-of-load applications” here and a video, “ Point-of-Load Power Supplies: Converters or Controllers? Download the Power System for Enterprise Ethernet Switches Reference Design featuring the TPS548D22.


TI; www.ti.com/tps548d22-pr-eu