The VI Chip Bus Converter Module (BCM) is a high efficiency (>96%), narrow input range Sine Amplitude Converter (SAC) operating from a 38 to 55 Vdc primary bus to deliver an isolated 12.7 V to 18.3 V secondary. The BCM may be used to power non-isolated POL converters or as an independent 12.7 18.3 V source. Due to the fast response time and low noise of the BCM, the need for limited life aluminum electrolytic or tantalum capacitors at the load is reduced--or eliminated--resulting in savings of board area, materials and total system cost.