SY8088_DATASHEET规格书.pdf

Application Notes: AN_SY8088 High Efficiency 1.5MHz, 1A Synchronous Step Down Regulator AN_SY8088 Rev. 0.1 Silergy Corp. Confidential- Prepared for Customer Use Only 1 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. Ordering Information Package Code Temperature Code Optional Spec Code ( )SY8088 Temperature Range: -40°C to 85°C Features Low RDS(ON) for internal switches (top/bottom) 260m /170m 2.5~5.5V input voltage range 40 A 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 Applications ortable Navigation Device Set Top Box USB Dongle Media Player Smart phone Typical Application Figure1. Schematic Diagram Figure2. Efficiency Ordering Number Package Type Note SY8088AAC SOT23-5 1A AN_SY8088 AN_SY8088 Rev. 0.1 Silergy Corp. Confidential- Prepared for Customer Use Only 2 Pinout (Top View) (SOT23-5) Top Mark: LD (device code: LD, Pin Name Pin Number Pin Description EN 1 Enable control. Pull high to turn on. Do not float. GND 2 Ground pin. LX 3 Inductor pin. Connect this pin to the switching node of the inductor. IN 4 Input pin. Decouple this pin to the GND pin with at least 4.7uF ceramic capacitor. FB 5 Output Feedback Pin. Connect this pin to the center point of the output resistor divider (as shown in Figure 1) to program the output voltage: VOUT=0.6*(1+R1/R2).Add optional C