MAX1558HETB+T

Specialized Overview

The MAX1558HETB+T is a dual USB power switch IC in a 10-pin TDFN package. It operates from a 2.7V to 5.5V supply with a typical on-resistance of 55mΩ and standby current of 3µA. The device features programmable current limiting up to 1.2A via an external resistor, independent thermal shutdown at +160°C, and reverse-current blocking. It includes autoreset functionality that latches off during sustained faults (>20ms) and restarts when the fault clears. The 'H' suffix indicates active-high enable logic for ONA/ONB inputs.

Specialized Feature Summary

• Dual-channel architecture with independent control and fault monitoring
• Active-high enable logic for channel activation
• Programmable current limiting with short-circuit protection
• Autoreset mechanism for automatic recovery after fault removal

Specialized Applications

• USB Ports and Hubs
• Notebook Computers and Desktops
• PDAs and Palmtop Computers
• Docking Stations

Specialized Procurement Notes

Verify the specific ordering suffix ETB against the datasheet to confirm the 10-pin TDFN (3mm x 3mm) package and -40°C to +85°C temperature range. Ensure the active-high enable requirement matches the system design, as this variant differs from the standard MAX1558. Confirm lead-free status and RoHS compliance through official manufacturer documentation before finalizing procurement.

Specialized Selection Notes

Select this component when active-high enable signals are required for USB port switching applications. The MAX1558H is functionally identical to the MAX1558 except for the enable polarity. Designers must account for the 20ms fault blanking time and autoreset delay when integrating with host controllers. Ensure adequate input capacitance is provided to handle transient loads without triggering false fault indications.

Specialized Part Context

The MAX1558HETB+T belongs to the MAX1558 family of dual USB switches. It shares core specifications with the MAX1558ETB+T but utilizes active-high logic for the ONA and ONB pins. This family is designed for portable electronics requiring robust USB port protection with minimal footprint. The TDFN package offers space-saving benefits for dense PCB layouts.

Specialized Replacement Considerations

The MAX1558ETB+T is a direct functional substitute if the system supports active-low enable signals. Verify pin compatibility and enable logic inversion requirements before swapping. No other cross-model substitutes are confirmed in the provided documentation.