FOUR_CELL_TO_5_VDC_CONVERTER

Published:2009/7/13 2:54:00 Author:May | From:SeekIC

Generating a regulated 5-V output frorrt a four-cell NiCd battery pack requires step-down opera-tion when the battery voltage is above 5 V (fully charged pack at 6 V) and step-up operation when the battery voltage drops from 5 V to 3.6 V during discharge. The LT1373 converter circuit shown achieves up to 83 percent efficiency at high current (100- to 200-mA range), better than a flyback approach. The 250-kHz switching frequency minimizes inductor values, and both 33-μH inductors are wound on the same core, requiring less board area. With a quiescent current of I mA typically, the LT1373 offers high efficiency at high frequency, extending the battery lifetime in applications.



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