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TI unveils 20V DC/DC synchronous buck controller

Posted: 01 Nov 2013 ?? ?Print Version ?Bookmark and Share

Keywords:DC/DC controller? POL? inductor current sensingp0?

Texas Instruments (TI) has rolled out what it describes as the first analogue DC/DC step-down controller with remote bipolar junction transistor (BJT) temperature-compensated inductor current sensing that cuts total solution footprint in high-power POL conversion. The 20V LM27403 DC/DC synchronous buck controller promise to provide greater than 95 per cent efficiency from a 12V input at 25 A of output current to optimise solution size and deliver fast transient response in communications infrastructure, industrial, medical and power module applications. Used in conjunction with TI's WEBENCH online design tool, the LM27403 ease DC/DC conversion and speeds the design process, stated the company.

The temperature-compensated inductor DC resistance sensing improves the current limit accuracy to 10 per cent over temperature by using a low-cost BJT to measure real-time temperature shifts, allowing the LM27403 to maintain a consistent current limit threshold across the operating temperature range. The current limit accuracy over temperature results in a smaller DC/DC converter footprint that reduces inductor over-design and allows for the use of smaller and lower-cost inductors.

The LM27403 provides a complete dynamic voltage solution when designed together with TI's LM10011Vage identification (VID) interface controller and 30V CSD87350Q5D synchronous buck NexFET Power Block MOSFET to adjust the core voltage (VCORE) of a VID-enabled processor, such as TI's TMS320C6000 power-optimised DSPs and KeyStone based multi-core DSPs.

TI unveils 20V DC/DC synchronous buck controller

Its wide 3-20V input voltage range converts 3.3V, 5V and 12V input voltage rails to point-of-load (POL) as low as 0.6V with one-per cent accuracy, stated the firm. Additionally, its 30ns minimum on-time allows higher switching frequencies at lower duty cycles, providing greater scalability and smaller solution size, while its 15ns adaptive dead-time control provides higher efficiency in high frequency operation, reducing power consumption. Output voltage remote sensing gives improved load regulation in high current applications.

The LM27403 synchronous buck controller is available in volume now from TI and its authorised distributors. Offered in a 4 x 4 x 0.8mm, 24-pin PowerPad WQFN package, the controller is priced at $1.20 in 1,000-unit quantities.





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