The RT8240B is a high-efficiency, synchronous step-down DC-DC converter from Richtek USA Inc. It is designed to deliver up to 2A of continuous current from an input voltage range of 4.5V to 18V. This converter integrates low RDS(on) MOSFETs to minimize conduction losses and maximize efficiency. The RT8240B employs a constant-on-time (COT) control architecture to provide fast transient response and stable operation with ceramic output capacitors. The device includes a power-good indicator, over-voltage protection (OVP), over-current protection (OCP), and thermal shutdown for enhanced system reliability.

Applications:

• Notebook Computers
• Tablet PCs
• LCD Monitors
• Portable Devices
• Point of Load (POL) Converters

Features:

• Wide Input Voltage Range: 4.5V to 18V
• 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
• Power-Good Indicator
• Over-Voltage Protection (OVP)
• Over-Current Protection (OCP)
• Thermal Shutdown
• Available in a WQFN-16 (3x3) Package

Benefits:

• High Efficiency: Extends battery life and reduces power dissipation.
• Fast Transient Response: Ensures stable output voltage under varying load conditions.
• Integrated Protection Features: Enhances system reliability and protects against potential damage.
• Wide Input Voltage Range: Provides flexibility in power supply design.
• Small Package Size: Allows for compact and space-saving designs.

Additional Details:

The RT8240B’s COT control architecture simplifies design and reduces the number of external components required. It operates at a typical switching frequency of 600kHz, enabling the use of smaller inductor and capacitor sizes. The internal soft-start function limits inrush current during startup. The RT8240B is available in a thermally enhanced WQFN-16 (3x3) package and is compliant with RoHS standards.