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IPS521

IPS521 Description

The IPS521 from Infineon Technologies is a high-side power switch designed for general-purpose load driving applications. This obsolete N-channel MOSFET-based switch offers a 1:1 input-to-output ratio and operates with a load voltage range of 5.5V to 35V, making it suitable for a variety of industrial and automotive systems. With a maximum output current of 2.2A and a low Rds(ON) of 55mΩ (typical), the IPS521 ensures efficient power delivery with minimal conduction losses. The device is housed in a TO-220AB through-hole package, providing robust thermal performance and ease of integration.

IPS521 Features

• High-Side Configuration: Enables simplified circuit design by eliminating the need for a separate supply voltage (Vcc/Vdd not required).
• Advanced Protection: Integrated current limiting (fixed), open-load detection, and over-temperature fault protection enhance system reliability.
• Auto-Restart Function: Automatically recovers from fault conditions, reducing downtime in critical applications.
• Low Power Dissipation: Optimized Rds(ON) minimizes heat generation, improving energy efficiency.
• REACH Unaffected & MSL 1: Compliant with environmental regulations and suitable for extended storage.

IPS521 Applications

The IPS521 is ideal for:

• Automotive Systems: Power distribution in lighting, solenoids, or motor control modules.
• Industrial Automation: Driving relays, actuators, or small DC motors.
• Consumer Electronics: Load switching in power supplies or battery management circuits.
• HVAC Controls: Fan or pump drivers requiring robust fault protection.

Conclusion of IPS521

While marked as obsolete, the IPS521 remains a reliable choice for designers seeking a high-efficiency, protected high-side switch with proven performance. Its combination of low Rds(ON), integrated safeguards, and auto-recovery makes it well-suited for demanding environments. For legacy systems or specific replacements, the IPS521 offers a balance of simplicity, durability, and precision control. Engineers should evaluate alternative Infineon solutions for new designs while considering this model for maintenance or retrofits.