The XC9111A451PRN is a synchronous step-up DC/DC converter manufactured by Torex Semiconductor Ltd, featuring an integrated coil. This converter is designed to efficiently boost a lower input voltage to a stable 4.5V output voltage. Its integrated coil simplifies the circuit design and reduces the required board space. The device employs PWM/PFM control to optimize efficiency across a wide range of load conditions.

Applications

• Power supplies for portable electronic devices
• Battery-powered applications
• Wearable devices
• IoT (Internet of Things) devices
• LED driving circuits

Features

• Integrated Coil: Reduces external component count and simplifies PCB layout.
• Synchronous Rectification: Enhances efficiency by using a MOSFET instead of a Schottky diode for rectification.
• PWM/PFM Control: Automatically switches between PWM and PFM modes to optimize efficiency at different load levels.
• Low Start-up Voltage: Allows operation from low input voltage sources, suitable for single-cell battery applications.
• Fixed Output Voltage: Provides a stable 4.5V output voltage.
• Overcurrent Protection: Protects the device and load from damage due to excessive current.
• Thermal Shutdown Protection: Shuts down the device if the internal temperature exceeds a certain limit, preventing damage from overheating.
• Compact Package: Allows for small and compact designs.

Benefits

• High Efficiency: Maximizes battery life in portable devices by minimizing power losses.
• Simplified Design: Reduces complexity and component count, making the design process easier.
• Small Footprint: Allows for compact product designs, saving board space.
• Stable Output Voltage: Ensures reliable operation of connected devices by providing a consistent power supply.
• Robust Protection: Protects against potential damage from overcurrent and thermal overload.

Additional Details

The XC9111A451PRN operates with a typical input voltage range from 0.9V to 5.5V. The synchronous rectification reduces power dissipation, contributing to the high efficiency. The PWM/PFM control scheme ensures optimal efficiency under varying load conditions. The integrated coil eliminates the need for external inductor selection and placement. This device incorporates safety features such as overcurrent and thermal shutdown protection to ensure robust operation. The package is small and thermally enhanced for efficient heat dissipation. The 'N' suffix typically indicates specific packaging or feature variations.