The RT8223B is a synchronous step-down DC-DC converter from Richtek USA Inc. It’s designed to provide a high-efficiency power solution for portable systems and other applications. The device is capable of delivering up to 3A of continuous current and operates from an input voltage range of 4.5V to 18V. The RT8223B integrates main and synchronous switches with low RDS(ON) to minimize conduction losses. It also adopts an advanced constant on-time (ACOT) control architecture to provide fast transient response and stable operation with ceramic output capacitors. The device provides several protection features including over-voltage protection (OVP), under-voltage protection (UVP), over-current protection (OCP), and thermal shutdown.

Applications:

• Notebook Computers
• Tablet PCs
• LCD Monitors
• Embedded Systems
• Point of Load (POL) Converters

Features:

• Wide Input Voltage Range: 4.5V to 18V
• Up to 3A Continuous Output Current
• High Efficiency: Up to 95%
• Integrated Low RDS(ON) MOSFETs
• Advanced Constant On-Time (ACOT) 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: Reduces power dissipation and extends battery life in portable applications.
• Fast Transient Response: Maintains stable output voltage under rapidly changing load conditions.
• Integrated Protection Features: Enhances system reliability and prevents damage from fault conditions.
• Wide Input Voltage Range: Offers flexibility in power supply design.
• Small Package Size: Enables compact designs for space-constrained applications.

Additional Details:

The RT8223B's ACOT control architecture simplifies the design and reduces the number of external components required. It features a typical switching frequency of 600kHz, which allows for the use of small inductors and capacitors. The device incorporates a power-good output to indicate the output voltage status. Furthermore, it has an enable pin for power sequencing. The RT8223B is available in a thermally enhanced WQFN-16 (3x3) package and is compliant with RoHS standards.