LTC4558EUD

Overview

The LTC4558EUD is a dual SIM/smart card power supply and interface IC designed for advanced cellular telephones. It provides the necessary power conversion and signal level translation to interface with 1.8V or 3V subscriber identity modules. The device operates from a single supply voltage ranging from 1.4V to 5.5V, supporting input voltages between 2.7V and 5.5V. It features a low quiescent current of 65µA and integrates protection mechanisms for smart card applications.

Feature Summary

• Integrates power conversion and signal level translation for dual SIM interfaces
• Supports 1.8V and 3V subscriber identity module standards
• Operates on a single supply voltage range of 1.4V to 5.5V

Applications

• Advanced cellular telephone systems
• Dual SIM mobile devices
• Smart card interface circuits

Procurement Notes

Verify the specific suffix (e.g., #PBF, #TRPBF) against the manufacturer's official datasheet to confirm package type and tape/reel specifications. Ensure compliance with RoHS directives if required by the application. Cross-reference the ordering part number with Analog Devices Inc. documentation to avoid discrepancies in pinout or thermal performance.

Selection Notes

Select this component when designing for dual SIM architectures requiring integrated power management and level shifting. Consider the 20-pin HVQCCN package constraints for PCB layout. Evaluate the 1.4V to 5.5V input range compatibility with the system's main power rail. Verify that the 65µA operating current aligns with the device's standby power requirements.

Part Context

The LTC4558EUD belongs to Analog Devices' specialized power management portfolio, specifically targeting mobile communication interfaces. It replaces discrete solutions by combining boost converters and level shifters into a single QFN package. This integration reduces board space and simplifies design complexity for multi-SIM implementations in modern handsets.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation. Consult Analog Devices Inc. for current alternative recommendations based on specific electrical requirements.