The XC9111A331MRN is a synchronous step-up DC/DC converter, manufactured by Torex Semiconductor Ltd, featuring an integrated coil. This converter is designed to boost a lower input voltage to a stable higher output voltage, simplifying circuit design and reducing board space. The device utilizes a PWM/PFM control circuit, automatically switching between Pulse Width Modulation (PWM) and Pulse Frequency Modulation (PFM) modes to optimize efficiency over a wide range of load currents.

Applications

• Power supplies for portable electronics
• Battery-powered devices
• LED lighting applications
• Wearable devices
• Energy harvesting systems

Features

• Integrated Coil: Simplifies circuit design and reduces the number of external components.
• Synchronous Rectification: Improves efficiency by using a MOSFET instead of a diode for rectification.
• PWM/PFM Control: Automatically switches between PWM and PFM modes to optimize efficiency at both heavy and light loads.
• Low Start-up Voltage: Operates from a low input voltage, suitable for single-cell battery applications.
• Fixed Output Voltage: Provides a stable 3.3V output voltage.
• Overcurrent Protection (OCP): Protects the device and the load from excessive current.
• 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: Minimizes power loss and extends battery life in portable devices.
• Simplified Design: Reduces the complexity of circuit design, accelerating development time.
• Small Footprint: Enables the design of compact and portable devices.
• Stable Output Voltage: Ensures reliable operation of connected devices by providing a consistent power supply.
• Robust Protection: Protects against potential damage from overcurrent and overheating conditions.

Additional Details

The XC9111A331MRN operates with an input voltage range that typically starts from 0.9V and can go up to 5.5V, boosting it to a fixed 3.3V output. The internal switching frequency is optimized for efficiency and small component size. The synchronous rectification feature significantly reduces power loss compared to traditional diode-based boost converters. The device is available in a small package, facilitating efficient heat dissipation. The integrated coil eliminates the need for external inductor selection and placement, simplifying the design process and reducing the overall solution size. The "N" suffix typically denotes a specific packaging or configuration variant.