The MIC2090-1YM5 is a power distribution switch manufactured by Micrel (now Microchip Technology). It's designed to protect electronic circuits from overcurrent and short-circuit conditions. It integrates a precision current limit and overtemperature protection in a small package.

Applications

• USB power distribution
• Power supply control
• Hot-swap applications
• Notebook computers
• Networking equipment

Features

• Precision current limiting: Provides accurate and reliable overcurrent protection.
• Over-temperature protection: Automatically shuts down the switch to prevent thermal damage.
• Short-circuit protection: Fast response to short-circuit conditions.
• Reverse Blocking: Blocks current flow when the output voltage is higher than the input.
• Enable/Disable control: Allows the switch to be easily turned on or off.
• Low on-resistance: Minimizes power loss and voltage drop.
• Small package: Available in compact packages like SOT-23 or similar.

Benefits

• Enhanced system protection: Prevents damage to sensitive electronic components from overcurrent and short-circuit conditions.
• Improved system reliability: Automatic shutdown in overtemperature conditions prevents catastrophic failures.
• Simplified design: Integrated features reduce component count and board space.
• Increased safety: Protects users and equipment from electrical hazards.
• Reduced power consumption: Low on-resistance minimizes power loss.

Additional Details

The MIC2090-1YM5 acts as a smart power switch. It monitors the current flowing through it and, if the current exceeds a preset limit or the device overheats, it will automatically shut off the power to protect the load. This is crucial for protecting USB ports from devices drawing excessive current, which can damage the host device. The current limit is typically factory-set, and datasheets provide detailed information on the specific current limit for each model variation. It typically operates from a 2.7V to 5.5V supply voltage range. The enable/disable pin allows for external control of the power switch, allowing it to be turned on or off by a microcontroller or other control circuitry. The reverse blocking function prevents current from flowing back into the power supply if the output voltage is higher than the input voltage. Its small package makes it ideal for portable devices and other space-constrained applications.