MAX1558ETB+T

Specialized Overview

The MAX1558ETB+T is a dual USB power switch IC from Analog Devices/Maxim Integrated, housed in a 10-pin TDFN (3mm x 3mm) package. It operates within a supply voltage range of 2.7V to 5.5V and delivers up to 1.2A per channel. The device features programmable current limiting set by an external resistor, with a typical threshold of 1.4A at a 26kΩ setting. Key electrical parameters include a maximum on-resistance of 105mΩ, standby current of 6µA, and quiescent current of 75µA. It incorporates autoreset functionality that latches off during sustained faults (>20ms) and automatically restarts when the fault clears.

Specialized Feature Summary

• Dual independent switches with active-low enable control for the MAX1558 variant
• Programmable current limiting via a single external resistor
• Autoreset mechanism that monitors outputs and restores power after transient faults are removed
• Integrated thermal shutdown and reverse-current blocking capabilities

Specialized Applications

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

Specialized Procurement Notes

Verify the specific suffix ETB+T corresponds to the -40°C to +85°C temperature range and active-low logic configuration. Confirm RoHS compliance status through official manufacturer documentation or authorized distributors before procurement. Ensure ordering details match the exact pinout and functional requirements for the target application design.

Specialized Selection Notes

Select the MAX1558ETB+T over the MAX1558HETB+T when an active-low enable signal is required for switch control. Ensure the external ISET resistor value keeps the programmed current limit within safe operating boundaries. Verify that the PCB layout accommodates the exposed pad for optimal thermal dissipation given the compact package dimensions.

Specialized Part Context

This component belongs to the MAX1558 family of dual USB switches designed for portable electronics. It shares architectural similarities with other Maxim power distribution ICs but is specifically optimized for USB port protection. The ETB+T designation identifies the lead-free version in the TDFN-10 package suitable for surface-mount assembly.

Specialized Replacement Considerations

The MAX1558HETB+T serves as a direct functional substitute if an active-high enable signal is preferred instead of active-low. Both parts share identical electrical characteristics, pinouts, and thermal performance. No circuit modifications are required when swapping between these variants provided the logic levels are adjusted accordingly.