SY8088 PDF文档

Application Notes: AN_SY8088 High Efficiency 1.5MHz, 1A Synchronous Step Down Regulator Preliminary Specification General Description SY8088 is a high efficiency 1.5MHz synchronous step down DC/DC regulator IC capable of delivering up to 1A output current. It can operate over a wide input voltage range from 2.5V to 5.5V and integrate main switch and synchronous switch with very low RDS (ON) to minimize the conduction loss. Features Low RDS(ON) for internal switches (top/bottom) 260m /170m 2.5~5.5V input voltage range 40µA typical quiescent current High light load efficiency High switching frequency 1.5MHz minimizes the external components Internal soft-start limits the inrush current 100% dropout operation RoHS Compliant and Halogen Free Compact package: SOT23-5 Ordering Information SY8088 □(□□)□ Temperature Code Package Code Optional Spec Code Temperature Range: -40°C to 85°C Ordering Number SY8088AAC Package Type SOT23-5 Note 1A Applications Portable Navigation Device Set Top Box USB Dongle Media Player Smart phone Typical Application Efficiency vs. Load Current 95 90 85 80 VIN=3.3V,VOUT=1.8V VIN=4.2V,VOUT=1.8V 75 VIN=5.0V,VOUT=1.8V 70 1 10 100 1000 Load Current (mA) Figure1. Schematic Diagram Figure2. Efficiency AN_SY8088 Rev. 0.1 Silergy Corp. Confidential- Prepared for Customer Use Only 1