ST1S09 and ST1S30 DC/DC Power Converters

STMicroelectronics' ST1S09 and the ST1S30 are step-down voltage regulators optimized for powering low output applications. The ST1S09 supplies a current in excess of 2 A and the ST1S30 supplies a current in excess of 3 A. Both DC/DC converters have a high switching frequency (1.5 MHz) that allows the use of tiny surface-mount components. The input voltage range for both devices is from 2.7 V to 6 V. The devices are thermally protected and the synchronous rectifier is integrated, therefore the number of external devices is reduced to minimum: a resistor divider, an inductor and two small capacitors. The typical efficiency for both step-down voltage regulators is >90%. Two versions are available for each of the devices: power good or inhibit. Both DC/DC converters are placed in small DFN packages.