MAX1946ETA+T

Overview

The MAX1946ETA+T is a single-channel USB power distribution switch IC designed for portable and peripheral applications. It operates within a supply voltage range of 2.7 V to 5.5 V, supporting standard USB bus voltages. The device delivers an output current of up to 500 mA with a maximum on-resistance of 110 mOhms. It features an integrated current limit of 1.1 A and includes auto-reset functionality following fault conditions. Switching times are characterized by a maximum turn-on time of 1.5 ms and a maximum turn-off time of 2 ms. The component is housed in a compact 3 x 3 mm exposed pad package suitable for surface mount assembly.

Feature Summary

• Integrates auto-reset protection that automatically restores power after overcurrent or short-circuit events clear
• Provides precise current limiting at 1.1 A to protect upstream host ports from damage during fault conditions
• Features low on-resistance to minimize power loss and voltage drop across the switch channel

Applications

• USB port protection in personal computers and laptops
• Power switching for USB peripherals such as hubs and storage devices
• Battery-powered equipment requiring efficient power distribution management

Procurement Notes

Verify the exact suffix and tape/reel specifications against the manufacturer's latest datasheet before ordering. Confirm RoHS compliance status and lead times directly with authorized distributors, as availability may vary. Ensure the selected packaging format matches your automated assembly requirements. Cross-reference the part number with official Analog Devices documentation to confirm pinout compatibility.

Selection Notes

Select this component when a single-channel solution with automatic recovery is required for USB power lines. Evaluate the 110 mOhm on-resistance against thermal constraints in high-current scenarios. Consider the 1.5 ms turn-on delay relative to system startup timing requirements. Compare the 500 mA continuous current rating against peak load demands of connected peripherals to ensure adequate headroom.

Part Context

This device belongs to the Maxim Integrated USB switch family, focusing on power distribution and port protection. It complements other switches in the series that offer different channel counts or higher current capabilities. The design targets cost-sensitive consumer electronics where space efficiency and robust fault handling are critical priorities for system reliability.

Replacement Considerations

Consult official substitution guides for equivalent single-channel USB switches with similar current limits and package dimensions. Verify functional compatibility regarding auto-reset behavior and operating voltage ranges before implementing any alternative components.