FSA4485UCX

Analog Switches - Special Purpose Overview

The FSA4485UCX is a high-performance USB Type-C port multimedia switch designed to support analog audio headsets. It enables the sharing of a USB Type-C port to pass USB 2.0 signals, analog audio, sideband use (SBU) signals, and analog microphone signals. The device incorporates MOSFET gate drivers to support low-resistance external analog ground switches. Key electrical parameters include a VCC range from 2.7 V to 5.5 V for the primary supply. It features over-voltage protection on common node pins and over-current protection for the analog ground switch. Audio switch performance includes THD+N < -109 dB at 1 VRMS with a 32-ohm load, while the USB switch bandwidth reaches 1 GHz. On-resistance is typically 225 mΩ from sense to GSBUx and 78 mΩ from SBUx to AGND.

Analog Switches - Special Purpose Feature Summary

• Supports simultaneous transmission of USB 2.0 data, analog audio, SBU signals, and analog microphone inputs through a single USB Type-C port.
• Integrates over-voltage protection on connector-facing pins and over-current protection for the analog ground switch.
• Includes programmable gate drivers for optional external SBUx to AGND switches to enhance audio performance.
• Features I2C interface capability with two selectable addresses and 1.2 V logic compatibility.

Analog Switches - Special Purpose Applications

• Mobile phones
• Tablets
• Notebook PCs
• Media players

Analog Switches - Special Purpose Procurement Notes

Verify component authenticity by checking the manufacturer's marking code against official documentation. Confirm the package type matches the required PCB footprint. Ensure the voltage ratings align with the target system's USB Type-C power delivery specifications. Validate that the I2C address configuration meets the design constraints. Check for any specific handling requirements related to electrostatic discharge sensitivity during assembly.

Analog Switches - Special Purpose Selection Notes

Select this component when designing USB Type-C interfaces requiring analog audio headset support alongside data connectivity. Consider the integrated over-voltage and over-current protections for robust port management. Evaluate the need for external analog ground switches if lower insertion loss is critical for audio quality. Verify that the operating voltage range suits the system's power rail availability. Assess the I2C interface requirements for dynamic configuration or detection functions.

Analog Switches - Special Purpose Part Context

The FSA4485UCX belongs to onsemi's portfolio of USB Type-C multimedia switches. It is part of the FSA448 series, which focuses on integrating audio switching capabilities with standard USB data paths. This family targets mobile and portable computing devices where space constraints necessitate highly integrated signal routing solutions. The UCX suffix indicates the specific WLCSP package variant used for compact board layouts.

Analog Switches - Special Purpose Replacement Considerations

No public confirmed substitute part numbers are available in the provided documentation. Designers should consult onsemi directly for potential alternatives or newer generation replacements within the FSA448 series or similar product lines.

Analog Switches - Special Purpose FAQ

What is the maximum DC tolerance on the CC_IN pin?

The CC_IN pin supports a 20 V DC tolerance.

Does the FSA4485UCX support analog microphone signals?

Yes, the device allows sharing of the USB Type-C port to pass analog microphone signals along with other media types.

How many I2C addresses does the device support?

The FSA4485UCX supports two I2C addresses.