ON Semiconductor FPF2123 Power Load Switch, High Side, 5.5V, 0.8A, SOT-23-5

The FPF2123 from ON Semiconductor is a full-featured IntelliMAX load switch designed to protect systems and loads from large current conditions. Housed in a compact 5-pin SOT-23 package, this high-side switch integrates a 0.125Ω current-limited P-channel MOSFET that operates over a wide input voltage range from 1.8V to 5.5V, making it suitable for a variety of power management applications.

This load switch offers an adjustable current limit from 0.15A to 1.5A, set via an external resistor, providing design flexibility to match specific application requirements. It includes essential protection features such as undervoltage lockout, thermal shutdown, and reverse current blocking, ensuring reliable operation under fault conditions. The controlled turn-on feature minimizes inrush current, while the fast current limit response time and fault blanking enhance system safety.

The switch is controlled by a logic input (ON) that directly interfaces with low-voltage control signals, and the active-high enable polarity simplifies integration with microcontrollers. With a shutdown current of less than 2μA, it is ideal for battery-powered portable devices where power efficiency is critical. The device operates over an ambient temperature range from -40°C to 85°C, ensuring robust performance in diverse environments. The FPF2123 is available in a SOT-23 package and is RoHS compliant.

Key Features

• High-side power load switch with 0.8A current limit
• Input voltage range: 1.8V to 5.5V
• Adjustable current limit from 0.15A to 1.5A
• On-resistance (Ron) of 125mΩ at TA = 25°C
• Thermal shutdown and undervoltage lockout protection
• Shutdown current less than 2μA
• Fast current limit response time
• Fault blanking and reverse current blocking
• Controlled turn-on for reduced inrush
• Compact SOT-23-5 package