DO-SCALDO design approach versus other split-rail, inductor-less DC-DC converter techniques

Split-rail power supplies are often used in modern electronic systems where dual-polarity voltages are required. Application areas such as portable devices, industrial and medical equipment where RFI/EMI issues and compact size are major concerns, alternative techniques are used as a replacement for inductor-based switching dual power supplies. This paper describes two such well-known inductor-less, split-rail power supply techniques based on the functionality, application scope, merit, and demerits while comparing them with the dual-output SCALDO technique. Two conventional methods are the op-amp based buffer circuit and the split-rail charge pump converter. Experimental results of a 12 V to ± 5 V DO-SCALDO technique is summarized to present the implementation aspects of the new technique.