95_PERCENT_EFFICIENT_5_V_INPUT_33_V_OUTPUT_DC_TO_DC_CONVERTER

Published:2009/7/13 2:36:00 Author:May | From:SeekIC

Computing equipment increasingly requires both 3.3-V and 5-V logic supplies, with only the 5-V being readily available. As 3.3-V current demands increase to include microprocessors, coprocessors, DSP processors, and memory, the total power demands on the 3.3-V supply rule out the rela-tively low efficiency and high dissipation of a linear regulator. The circuit shown here supplies 5 A at 3.3 V with over 94-percent efficiency by using the LTC1148-3.3 synchronous switching regulator.This surface-mount solution (L1 is through-hole) requires no heatsinks and very little board space.High efficiency is also maintained at low output currents by implementing Burst mode operation, making the LTC1148-3.3 solution ideal for supplies using normal/sleep modes, such as those in Green PCs. The LTC1148-3.3 can be placed in a shutdown mode, reducing supply current to a mere 22μA.



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