SY8120 DATASHEET规格书.pdf

Application Note: SY8120B1 High Efficiency Fast Response, 2A, 18V Input Synchronous Step Down Regulator AN_SY8120B1 Rev.0.9 Silergy Corp. Confidential-prepared for Internal Use Only 1 General Description SY8120B1 develops high efficiency synchronous step- down DC-DC converter capable of delivering 2A load current . SY8120B1 operates over a wide input voltage range from 4.5V to 18V and integrates main switch and synchronous switch with very low RDS(ON) to minimize the conduction loss. SY8120B1 adopts the instant PWM architecture to achieve fast transient responses for high step down applications and high efficiency at light loads. In addition, it operates at pseudo-constant frequency of 500 kHz under heavy load conditions to minimize the size of inductor and capacitor. Ordering Information Temperature Code Package Code Optional Spec Code SY8120 □ ( □□ ) □ Temperature Range: -40°C to 85°C Features ? Low RDS(ON) for internal switches (top/bottom):130/120 m? ? 4.5-18V input voltage range ? 2A load current capability ? Instant PWM architecture to achieve fast transient responses Internal softstart limits the inrush current ? 2% 0.6V reference ? Cycle-by-cycle peak current limitation ? RoHS Compliant and Halogen Free ? Compact package: SOT23-6 Applications ? Set Top Box ? Portable TV ? Access Point Router ? DSL Modem ? LCD TV ? CCTV ? IP CAM ? Networking Typical Applications 2 1 Figure 1. Schematic Diagram Figure 2. Efficiency Figure Ordering Number Package type Note SY8120B1ABC SOT23-6 -- Silergy C orp. Con fidential -Prepare d for pow erstar AN_SY8120B1 AN_SY8120B1 Rev.0.9 Silergy Corp. Confidential-prepared for Internal Use Only 2 Pinout (top view) (SOT23-6) Top Mark: WBxyz, (Device code: WB, x=year code, y=week code, z= lot number