LTC1555LEGN-1.8#TRPBF

Translators, Level Shifters Overview

The LTC1555LEGN-1.8#TRPBF is a SIM power supply and level translator in a 16-pin narrow SSOP package. It integrates a buck/boost charge pump DC/DC converter to generate regulated VCC outputs of 1.8V, 3V, or 5V for subscriber identity modules. The device accepts an input voltage range of 2.6V to 6V and supports controller supplies from 1.425V to 4.4V. Operating current is 32mA with shutdown current below 1mA. It includes internal level translators, soft-start functionality, and overtemperature protection.

Translators, Level Shifters Feature Summary

• Integrates a buck/boost charge pump DC/DC converter for generating regulated SIM supply voltages
• Provides bidirectional signal level translation between low-voltage controllers and 1.8V, 3V, or 5V SIMs
• Includes internal soft-start circuitry to limit inrush current during turn-on
• Features high ESD protection exceeding 10kV on all SIM contact pins

Translators, Level Shifters Applications

• SIM interface in GSM cellular telephones
• WCDMA cellular telephone SIM interface
• Smart card readers

Translators, Level Shifters Procurement Notes

Verify the specific suffix #TRPBF indicates tape and reel packaging when sourcing components. Confirm that the LE designation corresponds to the extended temperature range specifications outlined in the datasheet. Ensure compatibility with the required 16-lead narrow SSOP footprint during procurement planning.

Translators, Level Shifters Selection Notes

Select this component when interfacing low-voltage digital controllers with standard voltage SIM cards. The integrated charge pump eliminates the need for external inductors, simplifying board layout. Verify that the controller's data output configuration matches the supported open-drain or separate transmit/receive pin requirements.

Translators, Level Shifters Part Context

This part belongs to the LTC1555L family of SIM power supplies and level translators. It is designed specifically for mobile communication applications requiring compact power management solutions. The device consolidates voltage regulation and signal translation into a single miniature package to minimize system board area.

Translators, Level Shifters Replacement Considerations

The LTC1555IGN#PBF serves as a tube-packaged alternative within the same functional family. Other related parts include the LTC1555/LTC1556 for wider input voltage ranges and the LTC1755/LTC1756 for smart card interfaces.