The RT9243CS is a highly efficient, synchronous boost converter from Richtek USA Inc. designed primarily for applications requiring a stable output voltage from a lower voltage source, especially in portable devices. It features an integrated low RDS(ON) N-Channel MOSFET and synchronous rectification, which significantly reduces power loss and improves overall efficiency.

Applications:

• Portable Media Players
• Digital Cameras
• PDAs
• Smartphones
• GPS Devices
• Battery-Powered Portable Devices requiring boost voltage.

Features:

• High Efficiency: Achieves up to 95% efficiency, maximizing battery life.
• Synchronous Rectification: Internal synchronous rectifier minimizes power loss.
• Low RDS(ON) MOSFET: Integrated low resistance MOSFET reduces conduction losses.
• Adjustable Output Voltage: Output voltage can be programmed using external resistors.
• Wide Input Voltage Range: Operates from 2.5V to 5.5V input voltage.
• Shutdown Function: Integrated shutdown control for power saving in standby mode.
• Over-Temperature Protection (OTP): Thermal protection ensures device reliability.
• Over-Voltage Protection (OVP): Protects the output from excessive voltage.
• Under-Voltage Lockout (UVLO): Prevents operation with insufficient input voltage.
• Compact Package: Available in a space-saving package.

Benefits:

• Extended Battery Life: High efficiency conversion extends the operational time of battery-powered devices.
• Space-Saving Design: Small package allows for integration in compact applications.
• Reliable Operation: Comprehensive protection features ensure robust performance.
• Simplified Design: Integrated components simplify the design process and reduce BOM cost.
• Flexible Output: Adjustable output voltage allows for customized power solutions.

The RT9243CS utilizes a current-mode PWM control scheme to ensure stable operation and fast transient response. The switching frequency is typically around 1.2 MHz. Its small size and high efficiency make it an ideal choice for a wide range of portable applications requiring a boost converter.