INDUCTORLESS_BIPOLAR_SUPPLY_GENERATOR

Published:2009/7/16 20:54:00 Author:Jessie | From:SeekIC

Localized generation of bipolar supply rails is useful in many op-amp, data-conversion, and interface applications. To avoid the design time and effort of putting together a switching regulator circuit, switched-capacitor conversion should be considered as a simple, effective alternative. The LT1026 is shown here in a useful application circuit that can generate rail voltages of both polarities from a 5-V logic supply. Output voltage will vary with load (as shown on the graph), from ±9 V at minimal load currents to ±6 V at a load current of 15 mA. These boosted rails can be used to extend comrnon-mode input and output ranges of circuits without doing level shifting, ac coupling, or signal clipping. Because the LT1026 is supplied in an eight-lead SO package, the entire circuit can be surface-mounted using tantalum or ceramic capacitors.



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