MIC2545A-1YN

Overview

The MIC2545A-1YN is a high-side power switch IC designed for USB power distribution applications. It features a single N-channel output capable of delivering up to 3 A, with a programmable current limit adjustable between 500 mA and 3 A. The device operates within a supply voltage range of 2.7 V to 5.5 V and exhibits a maximum on-resistance of 50 mΩ. Key timing specifications include a maximum turn-on time of 5 ms and a maximum blanking time of 25 μs. It supports through-hole mounting in an 8-DIP package and functions reliably across an operating temperature range of -40°C to +85°C.

Feature Summary

• Programmable current limiting allows precise adjustment of the protection threshold from 500 mA to 3 A.
• Integrated soft-start mechanism controls turn-on time to minimize inrush current during activation.
• High-side configuration enables direct control of load power without requiring ground reference switching.

Applications

• USB port power distribution and protection
• Peripheral device power switching
• Overcurrent protection circuits

Procurement Notes

Verify the specific suffix '1YN' against the manufacturer's official datasheet to confirm the exact pinout, package dimensions, and electrical tolerances. Ensure that the required current limit settings align with the external resistor values specified in the design guidelines. Cross-reference the RoHS status and lead-free certification with the latest procurement documentation to meet regulatory compliance requirements.

Selection Notes

Select this component when a robust high-side switch with adjustable current protection is required for low-voltage DC loads. The wide input voltage range accommodates standard 3.3 V and 5 V systems. Consider the thermal performance of the DIP-8 package for the expected load conditions. Verify that the programmable current limit range covers the maximum operational current of the connected peripheral while providing adequate safety margin.

Part Context

This part belongs to the MIC2545A family of programmable current limit high-side switches. It serves as a protective interface between a power source and sensitive downstream electronics. The series is designed to replace discrete MOSFET solutions by integrating control logic, current sensing, and protection features into a single compact integrated circuit.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation. Consult Microchip Technology for qualified alternatives or cross-reference options based on specific pin-to-pin compatibility and electrical parameter matching.

FAQ

How is the current limit value determined?

The current limit is programmable and set by connecting an external resistor between the ILIM pin and ground. The specific resistance value determines the threshold between 500 mA and 3 A.

What is the function of the blanking time?

The blanking time prevents false triggering of the current limit during the initial turn-on phase. It disables the current sense circuit for a maximum duration of 25 μs after the switch activates.