Analogue DC/DC controller provides dynamic temperature-compensated inductor current sensing

Texas Instruments (TI) has introduced what it says is the first analogue DC/DC step-down controller with remote bipolar junction transistor (BJT) temperature-compensated inductor current sensing. The 20-V LM27403 DC/DC synchronous buck controller provides greater than 95-percent efficiency from a 12-V input at 25 A of output current to optimise both the solution”s size and to deliver a fast transient response in communications infrastructure, industrial, medical and power module applications.

Used in conjunction with TI”s WEBENCH online design tool, the LM27403 simplifies DC/DC conversion and speeds the design process.

The temperature-compensated inductor DC resistance sensing improves the current limit accuracy to 10 percent 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.

According to TI LM27403 provides a complete dynamic voltage solution when designed together with the company”s LM10011 voltage identification (VID) interface controller and 30-V 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 multicore DSPs.


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