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Step-down switching regulator
EDN Europe, 26 Aug 2008Linear Technology has launched the H-Grade version of the LT3481. The LT3481 is a 34V (36V(max)), BurstMode, step-down switching regulator that maintains quiescent current under 50uA. The H Grade version operates up to a junction temperature of 150°C. All electrical specifications are identical for the E, I and H. The H Grade parts are suitable for automotive, industrial and harsh environment applications that are subject to high ambient temperatures. The LT3481 operates within a VIN range of 3.3V to 34V, making it suitable for load dump or cold-crank conditions found in automotive applications. Its 3.2A internal switch delivers up to 2A of continuous output current to low 1.25V voltages. Its 50µA of quiescent current is suitable for applications such as automotive security systems, which require long battery life. The LT3481HDD is available from stock in a 10-lead 3mm x 3mm DFN package whereas the LT3481HMSE is available in a thermally enhanced MSOP-10 package.
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