SY8031

SY8031 High Efficiency 2.25MHz, 1.2A Synchronous Step Down Regulator Preliminary Design Spec General Description The SY8031 is a high-efficiency 2.25MHz synchronous step-down DC-DC converter capable of delivering 1.2A output current. SY8031 operates over a wide input voltage range from 2.5V to 5.5V and integrates main switch and synchronous switch with very low RDS(ON) to minimize the conduction loss. Ordering Information SY8031□(□□)□ Temerature Code C: 0°C~85°C Package Code: AA:SOT23-5 Spec Code Features low Rds(on) for internal switches (top/bottom): SY8031L: 300mΩ/200 mΩ, 0.6A SY8031: 200mΩ/150 mΩ, 1.2A continuous,2A peak 2.5-5.5V input voltage range 2.25MHz switching frequency 100uA quescient current Internal softstart limits the inrush current 1.5% 0.6V reference 100% dropout operation Compact package: SOT23-5 Applications WiFi Card Set Top Box GPS Toy Typical Applications VIN EN IN L CIN LX GND R1 FB R2 VOUT COUT Figure 1. Schematic Diagram Figure 2. Efficiency vs Load Current SY8031Rev. # 0.3 Silergy Corp. Confidential- Prepared for Customer Use Only 1 SY8031 Pinout Pin Name EN GND LX IN FB SOT23-5 3 2 5 1 4 IN 1 5 LX GND 2 EN 3 4 FB SOT23-5 (SY8031) Pin Description Enable control. Pull high to turn on. Do not float. Ground pin Inductor pin. Connect this pin to the switching node of inductor Input pin. Decouple this pin to GND pin with at least 1uF ceramic cap Output Feedback Pin. Connect this pin to the center point of th...