MAX1922ETB+

Overview

The MAX1922ETB+ is a current-limited power distribution switch designed for dual USB port applications. It features a low on-resistance of 70mΩ and incorporates built-in fault blanking to prevent false triggering during inrush events. The device provides an accurate, preset current limit ranging from 1.4A to 2.1A. It operates within a supply voltage range of 2.7V to 5.5V and supports an output current of up to 1A. The component is housed in a compact 10-WFDFN exposed pad package with dimensions of 3x3mm, suitable for surface-mount installation.

Feature Summary

• Integrates built-in fault blanking circuitry to ensure reliable operation during high inrush currents typical of USB connections.
• Provides precise current limiting with a preset range between 1.4A and 2.1A to protect downstream loads.
• Features low on-resistance of 70mΩ to minimize power loss and heat generation during normal operation.

Applications

• Dual-port USB hub power distribution
• USB peripheral overcurrent protection
• Portable device power management systems

Procurement Notes

Verify the specific suffix ETB+ corresponds to the 10-WFDFN (3x3) package when sourcing. Confirm RoHS compliance status through official manufacturer documentation or authorized distributors. Ensure the part number matches the exact pinout and thermal pad requirements for your PCB layout. Cross-reference with Analog Devices/Maxim Integrated databases for the most current lifecycle and availability status.

Selection Notes

Select this component when designing circuits requiring integrated overcurrent protection for USB ports without external sensing resistors. The fixed current limit simplifies design compared to programmable switches. Consider the 70mΩ on-resistance for efficiency calculations. The 10-WFDFN package offers thermal advantages via the exposed pad but requires appropriate thermal relief in the PCB design.

Part Context

The MAX1922 belongs to Maxim Integrated's family of USB power switches. It is functionally similar to other current-limited switches but distinguished by its specific 70mΩ resistance and integrated fault blanking timing. The ETB+ variant denotes the specific tape-and-reel or tube packaging and lead-free finish associated with the 10-pin DFN form factor.

Replacement Considerations

Direct substitutes include other Maxim USB switches with similar current limits and packages, such as the MAX1922ESA+ (SOIC-8 package). Verify that alternative parts maintain the 70mΩ on-resistance and compatible fault blanking characteristics to ensure system stability.

FAQ

What is the purpose of the built-in fault blanking in the MAX1922ETB+?

Fault blanking prevents the switch from turning off prematurely due to the high inrush current encountered when connecting USB devices, ensuring stable connection establishment.

What is the operating voltage range for the MAX1922ETB+?

The device operates with a supply voltage between 2.7V and 5.5V, making it compatible with standard USB 5V rails and lower voltage logic systems.