The FAN5201G is a synchronous rectified buck converter controller from Fairchild Semiconductor (now ON Semiconductor). It's designed for high-performance CPU power supplies. It achieves high efficiency and tight regulation, essential for modern processors.

Applications

• Desktop PC CPU core power
• Notebook PC CPU core power
• High current distributed power systems
• VRM (Voltage Regulator Module) applications

Features

• Synchronous rectification for high efficiency
• Voltage positioning to improve transient response
• Adjustable output voltage
• Over-current protection (OCP)
• Under-voltage lockout (UVLO)

Benefits

• Reduces power dissipation and heat generation
• Provides stable voltage during load changes
• Adaptable to different CPU voltage requirements
• Protects the CPU and power supply from damage

Specifications

The FAN5201G operates from a wide input voltage range, typically 5V or 12V. It uses a voltage-mode control architecture with adaptive voltage positioning. The switching frequency is adjustable. It includes comprehensive protection features like OCP and UVLO. The controller drives external N-channel MOSFETs for both the high-side and low-side switches. It is available in a SOIC package.