The RT8228A is a synchronous step-down DC-DC converter from Richtek USA Inc., designed to provide a high-efficiency power solution for portable devices and other battery-powered applications. This converter is capable of delivering up to 2A of continuous current over a wide input voltage range of 4.5V to 25V. The RT8228A features integrated high-side and low-side MOSFETs with low RDS(on) to minimize power losses and maximize efficiency. It employs a constant on-time (COT) control architecture to provide fast transient response and stable operation with ceramic output capacitors. Protection features include over-voltage protection (OVP), under-voltage protection (UVP), over-current protection (OCP), and thermal shutdown.

Applications:

• Notebook Computers
• Portable Media Players
• Tablet PCs
• Industrial Power Supplies
• Point of Load (POL) Converters

Features:

• Wide Input Voltage Range: 4.5V to 25V
• Up to 2A 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
• Over-Voltage Protection (OVP)
• Under-Voltage Protection (UVP)
• Over-Current Protection (OCP)
• Thermal Shutdown
• Available in a WQFN-16 (3x3) Package

Benefits:

• High Efficiency: Maximizes battery life in portable applications.
• Wide Input Voltage Range: Accommodates a variety of power sources.
• Fast Transient Response: Ensures stable output voltage under rapidly changing load conditions.
• Integrated Protection Features: Enhances system reliability and protects against potential damage.
• Small Package Size: Allows for compact and space-saving designs.

Additional Details:

The RT8228A's COT control scheme simplifies design and reduces the number of external components required. The device operates at a typical switching frequency of 500kHz, which allows for smaller inductor and capacitor sizes. It also incorporates a soft-start function to limit inrush current during startup. The RT8228A is available in a WQFN-16 (3x3) package and is RoHS compliant. It is an ideal choice for applications requiring high efficiency, compact size, and robust protection features.