The RT8209E is a high-efficiency, synchronous step-down DC-DC converter from Richtek USA Inc. that can deliver up to 3A of continuous current. It operates over a wide input voltage range of 4.5V to 23V, making it suitable for various applications powered by battery or adapter inputs. The device integrates low RDS(on) MOSFETs to minimize conduction losses and maximize efficiency. The RT8209E employs a constant-on-time (COT) control architecture to provide fast transient response and stable operation with ceramic output capacitors. It also features a power-good indicator, over-voltage protection (OVP), over-current protection (OCP), and thermal shutdown to ensure system reliability.

Applications:

• Notebook Computers
• LCD Monitors
• Networking Devices
• Point of Load (POL) Converters
• Industrial Power Supplies

Features:

• Wide Input Voltage Range: 4.5V to 23V
• Up to 3A Continuous Output Current
• High Efficiency: Up to 95%
• Integrated Low RDS(on) MOSFETs
• Constant-On-Time (COT) Control Architecture
• Fast Transient Response
• Stable with Ceramic Output Capacitors
• Power-Good Indicator
• Over-Voltage Protection (OVP)
• Over-Current Protection (OCP)
• Thermal Shutdown
• Available in a space-saving WQFN-16 (3x3) Package

Benefits:

• High Efficiency: Minimizes power loss and extends battery life.
• Wide Input Voltage Range: Provides flexibility in power supply design.
• Fast Transient Response: Ensures stable output voltage under varying load conditions.
• Integrated Protection Features: Enhances system reliability and prevents damage from fault conditions.
• Small Package Size: Allows for compact designs.

Additional Details:

The RT8209E's COT control architecture provides excellent transient response without requiring external compensation components. It features a typical switching frequency of 500kHz, which allows for the use of smaller external components. The internal soft-start function limits inrush current during start-up. The device also includes a hiccup mode over-current protection, which reduces power dissipation during short-circuit conditions. The RT8209E is available in a WQFN-16 (3x3) package and is RoHS compliant.