矽力杰产品规格书SY8105I.pdf

Application Note: SY8105I High Efficiency, Fast Response, 5.0A, 18V Input Synchronous Step Down Regulator General Description Features The SY8105I is a high efficiency 500kHz  Low RDS(ON) for Internal Switches synchronous step-down DC/DC regulator, which is (Top/Bottom): 41mΩ/27mΩ capable of delivering up to 5A load current. It can  4.5-18V Input Voltage Range operate over a wide input voltage range from 4.5V to  5A Output Current Capability 18V and integrates main switch and synchronous  500kHz Switching Frequency Minimize the switch with very low RDS(ON) to minimize the External Components conduction loss.  Stable with 22µF COUT and 0.68µH Inductor  Instant PWM Architecture to Achieve Fast The SY8105I adopts the instant PWM architecture to Transient Responses achieve fast transient responses for high step down  Internal Soft-Start Limits the Inrush Current applications and high efficiency at light loads. In  Cycle-by-cycle Peak/Valley Current Limitation addition, it operates at pseudo-constant frequency of 500kHz to minimize the size of inductor and  Hiccup Mode Output Short Circuit Protection capacitor.  Thermal Shutdown wit