A storageless DC-DC converter is provided having simultaneously ultra high efficiency of 99.5% in an ultra compact size leading to 1 kW/inch3 power density, while also providing a regulation over the wide input DC voltage range. In addition to fixed 2 to 1 step-down voltage conversion the continuous output voltage reduction is obtained by use of a new method of the modulation of the freewheeling time of one of the two current rectifiers. This provides a simple regulation of the output voltage via a standard duty ratio control, despite the wide range of the input voltage change and simultaneous wide range of the load current change. An alternative control method customarily used in classical resonant converters to control output voltage by change of the switching frequency with a fixed duty ratio control is also demonstrated. Because of its storageless feature and continuous output voltage regulation this converter is ideal for computer applications, such as VRM (Voltage Regulator Modules), demanding extremely fast transient response to fast load current changes and tight load voltage regulations requiring ultra low output ripple voltages.