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POL and LDO for Harsh Environment Applications
Keywords: POL (Point of Load), LDO ( Low Drop out Regulators), Harsh Environment
Harsh environment approved components / designs require high reliability as well as availability of power to meet their system needs. This paper will explore the various design constrains imposed on these high-temperature designs. Downhole oil and gas industry requires high reliability components that can withstand high temperature. Discrete component selection, packaging and constrains imposed by the various specification requirements to meet harsh environment approval are a critical aspect of high-temp designs. High temperature PCB material, PCB layout techniques, trace characteristics are an important aspect of high-temp PCB design and will be explored in the article. Buck converters are the basic building blocks, to meet system requirements to power FPGAs where low output voltage and high currents are required. Converters must be able to provide wider step-down ratios with high transient response, so buck converters are used. This article will explore the various features of a buck-based POL converter design. Low noise forces the need for low-dropout (LDO) regulators that can operate at high temperatures up to 210°C. This paper will address the power requirements to meet system needs.
Ramesh Khanna, Applications Engineer
Texas Instruments
Dallas, Texas
USA


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