The XC9111A281MR-G is a synchronous step-up DC/DC converter integrated with a coil, manufactured by Torex Semiconductor Ltd. This highly integrated device is designed to convert a lower input voltage to a higher, stable output voltage. It incorporates a PWM/PFM control circuit that automatically switches between PWM (Pulse Width Modulation) and PFM (Pulse Frequency Modulation) modes based on the load current, optimizing efficiency across a wide range of operating conditions.

Applications

• Power supplies for portable electronic devices
• Boost converters for battery-powered systems
• LED drivers for small displays and indicators
• Energy harvesting applications
• Backup power systems

Features

• Integrated Coil: Reduces the number of external components, simplifying circuit design and minimizing board space.
• Synchronous Rectification: Improves efficiency by replacing the traditional Schottky diode with a MOSFET for rectification.
• PWM/PFM Control: Optimizes efficiency by automatically switching between PWM mode for heavier loads and PFM mode for lighter loads.
• Low Start-up Voltage: Operates with a low input voltage, suitable for single-cell battery applications.
• Fixed Output Voltage: Provides a stable output voltage of 2.8V.
• Overcurrent Protection (OCP): Protects the device from damage caused by excessive current flow.
• Thermal Shutdown (TSD): Shuts down the device if the internal temperature exceeds a safe operating limit.
• Small Package: Available in a compact package for space-constrained applications.

Benefits

• High Efficiency: Maximizes battery life in portable applications by minimizing power loss during the voltage conversion process.
• Simplified Design: Reduces the complexity of circuit design and minimizes the number of external components required.
• Compact Size: Enables smaller and more portable product designs.
• Stable Output Voltage: Ensures reliable operation of connected devices by providing a consistent and stable power supply.
• Robust Protection: Protects the device and the load from potential damage due to overcurrent and overheating conditions.

Additional Details

The XC9111A281MR-G operates with a typical input voltage range of 0.9V to 5.5V, boosting it to a fixed output voltage of 2.8V. The internal switching frequency is optimized to balance efficiency and component size. The synchronous rectification feature significantly reduces power loss compared to traditional diode-based boost converters. The device is available in a small, thermally enhanced package, facilitating efficient heat dissipation. The "-G" suffix indicates that the product is lead-free and RoHS compliant, meeting environmental standards. The integrated coil eliminates the need for external inductor selection and placement, simplifying the design process and reducing the overall solution size.