SY8805A

Applications Note: AN_SY8805A High Efficiency 1 MHz, 5A Synchronous Step Down Regulator General Description The SY8805A is a high-efficiency 1 MHz synchronous step-down DC-DC regulator, Current Mode Control IC capable of delivering up to 5A output current. The SY8805A operates over a wide input voltage range from 3V to 5.5V. It integrates main switch and synchronous switch with very low RDS(ON) to minimize the conduction loss. High intergrated solution and DFN2x2-8 package perform the optimized BOM cost and reduce external component part count. Low input and output voltage ripple, small external inductor and capacitor sizes, small PCB layout space are achived with 1MHz switching frequency. Ordering Information SY8805□(□□)□ Temperature Code Package Code Optional Spec Code Temperature Range: -40°C to 85°C Ordering Number Package type Note SY8805ADFC DFN2x2-8 -- Features Low RDS(ON) for internal switches (top/bottom): 35/15 mohm 3-5.5V input voltage range 1 MHz switching frequency minimizes the external components Internal softstart limits the inrush current Up to 98% efficiency 0.6V reference voltage Shutdown mode draws<0.1uA supply current 100% dropout operation Power good indicator OVP/OCP/UVLO/OTP protections RoHS Compliant and Halogen Free Compact package: DFN2x2-8 Applications High definition Set Top Box LCD TV Access Point Router Mini-notebook PC Net PC Typical Applications Figure 1. Schematic Figure 2. Efficiency vs Load Curre...