The LM5067MM-1 is a high-side power MOSFET controller with inrush current control and overvoltage protection, manufactured by Texas Instruments (formerly National Semiconductor). This controller is designed to protect electronic systems from damaging inrush currents and overvoltage conditions during power-up or hot-swap insertion.

Applications

• Hot-swap applications: Protects systems during insertion and removal of cards or modules.
• Inrush current limiting: Limits the current surge at power-up to prevent damage to components.
• Overvoltage protection: Shuts down the system in case of an overvoltage condition.
• Server power supplies: Protects server components from power-related issues.
• Telecommunication equipment: Protects telecom equipment from voltage surges and inrush currents.

Features

• High-side MOSFET control: Controls the power MOSFET on the high side of the power supply.
• Adjustable inrush current limit: Allows setting the maximum inrush current.
• Adjustable overvoltage protection: Sets the voltage threshold for overvoltage shutdown.
• Undervoltage lockout (UVLO): Prevents operation if the input voltage is too low.
• Fault timer: Provides a delay before shutting down the system in case of a fault.

Benefits

• Protection from inrush current: Prevents damage to components during power-up.
• Protection from overvoltage: Protects the system from voltage surges.
• Improved system reliability: Enhances the robustness of the system against power-related failures.
• Simplified hot-swap design: Makes hot-swap insertion safer and more reliable.
• Reduced system downtime: Minimizes the risk of damage and failure due to power-related issues.

Additional Details

The LM5067MM-1 uses an external power MOSFET to control the flow of current to the load. The controller regulates the gate voltage of the MOSFET to limit the inrush current during power-up. It monitors the input voltage and shuts down the MOSFET if an overvoltage condition is detected. An undervoltage lockout (UVLO) feature prevents the device from operating if the input voltage is too low. The inrush current limit and overvoltage protection thresholds are adjustable using external resistors, allowing the device to be tailored to specific application requirements. The device is typically available in a small surface-mount package (e.g., a VQFN package), which saves board space. External components, such as resistors and capacitors, are required to set the operating parameters and provide filtering. Proper layout and grounding techniques are crucial for minimizing noise and ensuring stable operation. The LM5067MM-1 provides robust protection against inrush current and overvoltage conditions in various applications. It's crucial to review the datasheet to determine the device's specifications, limitations, and external component selection guidelines to guarantee proper circuit function.

The fault timer feature provides a delay before shutting down the system in case of a fault. This allows the system to ride through brief transient events without shutting down unnecessarily. The adjustable overvoltage and undervoltage thresholds provide flexibility in designing protection circuits for various applications. The LM5067MM-1 is designed to protect downstream circuitry by preventing excessive current or voltage from damaging sensitive components.