MAX1946EUA

Overview

The MAX1946EUA is a single-channel USB power switch manufactured by Analog Devices Inc./Maxim Integrated. It operates within a 2.7V to 5.5V input voltage range and delivers a guaranteed 500mA load current compliant with USB specifications. The device features selectable active-high or active-low control logic, an autoreset function for short-circuit protection, and a built-in 20ms fault-blanking circuit. It includes thermal-overload protection and a fault-indicator output. The component consumes 40µA quiescent current during operation and 3µA in shutdown mode.

Feature Summary

• Integrates autoreset functionality that latches the switch off during short circuits to conserve system power and reactivates upon removal of the fault condition.
• Includes a built-in 20ms fault-blanking circuit to prevent nuisance tripping during transient events.
• Provides thermal-overload protection that activates at approximately 150°C junction temperature to ensure safe operation.
• Offers flexible control via selectable active-high or active-low logic levels.

Applications

• USB Ports and USB Hubs
• Notebook and Desktop Computers
• PDAs and Palmtop Computers
• Digital Cameras
• Docking Stations

Procurement Notes

Verify the specific suffix 'EUA' against the manufacturer's official datasheet to confirm package type and pinout compatibility. Ensure the selected variant matches the required control logic polarity and thermal protection thresholds for the target application environment.

Selection Notes

Select this component when designing USB-powered systems requiring compact footprint and integrated fault management. Consider the 500mA current limit and 2.7V-5.5V operating range to ensure compatibility with standard USB voltage rails and peripheral load requirements.

Part Context

The MAX1946 belongs to Maxim Integrated's family of single USB switches designed for portable electronics. It addresses the need for space-saving solutions in mobile devices by combining current limiting, fault protection, and control logic in a tiny TDFN package.

Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided documentation. Verify cross-reference availability through official distributor channels if direct replacement is required.