The TMI32531S is a high efficiency, 600kHz, constant on-time (COT) control mode synchronous Buck converter with a wide input voltage range of 4.5V to 18V, and supports up to 3A continuous output current. TMI32531S integrates main switch and synchronous switch with very low RDS(ON) to minimize the conduction loss. Low output voltage ripple and small external inductor and capacitor size are achieved with 600kHz switching frequency. It adopts the COT architecture to achieve fast transient response for high voltage step down applications. The TMI32531S requires a minimum number of external components and is available in a 6-pin SOT23-6 ROHS compliant package.